The following discussion and analysis of our financial condition and results of
operations should be read in conjunction with our unaudited condensed
consolidated financial statements and related notes included in this Quarterly
Report. The following discussion and analysis of our financial condition and
results of operations should be read in conjunction with our consolidated
financial statements and related notes appearing elsewhere in this Quarterly
Report and the audited consolidated financial statements and notes thereto and
management's discussion and analysis of financial condition and results of
operations for the year ended December 31, 2020, included in our Annual Report
on Form 10-K that was filed with the SEC on February 25, 2021, and our Quarterly
Report on Form 10-Q that was filed with the SEC on May 6, 2021. Some of the
information contained in this discussion and analysis or set forth elsewhere in
this Quarterly Report, including information with respect to our plans and
strategy for our business, includes forward-looking statements that involve
risks and uncertainties. As a result of many factors, including those factors
set forth in the "Risk Factors" section of this Quarterly Report, our Quarterly
Report on Form 10-Q that was filed with the SEC on May 6, 2021, and our Annual
Report on Form 10-K for the year ended December 31, 2020, our actual results
could differ materially from the results described in, or implied by, these

forward-looking statements.

Overview


We are a clinical-stage biopharmaceutical company focused on providing novel cell therapies to people with cancer. We are a leader in the development of T-cell therapies for solid tumors and have reported clinical responses (per RECIST 1.1) in seven solid tumor indications.





Our proprietary platform enables us to identify cancer targets, find and develop
cell therapy candidates active against those targets and produce therapeutic
candidates for administration to patients. Our cell therapy candidates include
Specific Peptide Enhanced Affinity Receptor ("SPEAR") T-cells, which use
genetically engineered T-cell receptors; next generation T-cell Infiltrating
Lymphocytes ("TiLs") where a patient's own T-cells are co-administered with our
next generation technology, and HLA-independent TCRs ("HiTs") where surface
proteins are targeted independently of the peptide-HLA complex.



As the COVID-19 pandemic continues, we remain focused on ensuring the safety of
our workforce and continuing, where possible, to safely treat clinical trial
patients with our cell therapies. We continue to work with our clinical sites to
ensure that patients are

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treated safely in accordance with site-specific requirements and precautions.
Our facilities in the United States ("U.S.") and the United Kingdom ("U.K.")
remain open to support manufacturing and delivery of our existing cell therapies
as well as research and development of new cell therapies. Further information
on risks related to COVID-19 is provided in the "Risk Factors" section of our
Annual Report on Form 10-K for the year ended December 31, 2020.



We have multiple clinical trials ongoing:

SPEARHEAD-1 Phase 2 Trial with afamitresgene autoleucel ("afami-cel"): A

registration directed Phase 2 clinical trial is underway in synovial sarcoma

and myxoid round cell liposarcoma ("MRCLS") indications in which the MAGE-A4

antigen is expressed. Approximately 90 patients are planned to be treated in

this Phase 2 trial: 45 in Cohort 1 and 45 in Cohort 2. Enrollment in Cohort 1

is complete, and Cohort 2 is currently recruiting. The primary efficacy

analysis will include patients from Cohort 1 only. Initial data from Cohort 1

of this trial was presented at the American Society of Clinical Oncology (ASCO)

on June 4, 2021. As presented at ASCO 2021, the Company reported an overall

response rate for patients with at least one scan (evaluated by RECIST 1.1 per

investigator assessment) of 39.3% (13 out of 33 patients), with an overall

response rate of 41.4% (12/29 patients) for synovial sarcoma and 25.0% (1/4

patients) for MRCLS. Of the 29 patients with synovial sarcoma, the disease

control rate was 86.2% (25/29 patients) (defined as either response or stable

disease) with 2 complete responses and 10 partial responses. This data is

? intended to support the filing of a Biologics License Application (BLA) in 2022

and, upon approval from the U.S. Food and Drug Administration ("FDA"), the

Company plans to commercially launch afami-cel for the treatment of synovial

sarcoma and MRCLS. Orphan Drug designation for afami-cel for the treatment of

soft tissue sarcomas has been granted in the European Union and U.S. together

with Regenerative Medicine Advanced Therapy (RMAT) designation in the U.S. for

the treatment of synovial sarcoma and access to the Priority Medicines

("PRIME") Regulatory Support initiative by the European Medicines Agency

("EMA") for afami-cel for the treatment of synovial sarcoma. The EMA and the

FDA have agreed to the Company's pediatric investigational plans for afami-cel

in synovial sarcoma. The EMA pediatric investigational plan ("PIP") for

afami-cel will include pediatric patients aged 10 to under 18 years with

advanced synovial sarcoma in which the MAGE-A4 antigen is expressed. These

pediatric patients will be included in Cohort 2 of this trial. The FDA initial

pediatric study plan ("iPSP") will include HLA-A*02 positive children aged 2 to


   17 years (inclusive) who have MAGE-A4 expressing solid tumors.



SPEARHEAD-2 Phase 2 Trial with afami-cel: A Phase 2 trial combining afami-cel

? with pembrolizumab in patients with head and neck cancer expressing the MAGE-A4


   antigen is underway at clinical sites in the United States.




   SURPASS Phase 1 Trial with ADP-A2M4CD8: Enrollment is ongoing in a Phase 1

trial for our next generation SPEAR T-cells, ADP-A2M4CD8, focusing on treatment

of patients with lung, gastroesophageal, head and neck and bladder cancers in

which the MAGE-A4 antigen is expressed. Based on early data from patients with

ovarian cancer treated in the trial, the Company is planning to add this as a

focus indication to the SURPASS trial. This next generation SPEAR T-cell

? utilizes the same engineered T-cell receptor as afami-cel, but with the

addition of a CD8? homodimer. The addition of the CD8? homodimer has been shown

in vitro to increase helper cell response and SPEAR T-cell potency. Based on

the responses seen in the Phase 1 clinical trial using afami-cel and initial

responses seen in the SURPASS trial, we are planning to initiate a Phase 2

clinical trial with ADP-A2M4CD8 in esophageal and esophagogastric junction


   ("EGJ") cancers in the third quarter of 2021.



ADP-A2AFP Phase 1 Trial: We continue treating patients in our Phase 1 trial

designed to evaluate the safety and anti-tumor activity of our alpha

? fetoprotein ("AFP") specific therapeutic candidate for the treatment of

hepatocellular carcinoma ("HCC"). A further cohort has also been initiated for


   patients with tumors other than HCC that express the AFP antigen.



Afami-cel Phase 1 Trial - Radiation Sub-study: Our Phase 1 clinical trial of

afami-cel in urothelial, melanoma, head and neck, ovarian, non-small cell lung,

? esophageal and gastric, synovial sarcoma and MRCLS cancers has now completed

enrollment. A radiation sub-study of this trial ceased enrollment at the end of

July 2021. Five patients were treated in this sub-study and the Company plans


   to provide a data update at an upcoming congress.




We have an active preclinical pipeline of cell therapy candidates with the aim
of delivering five new cell therapies to the clinic in the next five years. The
pipeline includes new autologous SPEAR T-cells, SPEAR T-cells addressing
alternative HLA-types, next generation SPEAR T-cells, next-generation TILs and
HiTs. Preclinical data presented at the American Society of Gene & Cell Therapy
(ASGCT) in May 2021 from the Company's HiT mesothelin program validated that
human T-cells expressing a TCR targeting

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mesothelin, independent of HLA recognition, can kill human tumor cells in vitro;
and showed that the HiT works as well, or better than, an in-house developed
T-cell receptor fusion construct ("TRuC") targeting mesothelin in preclinical
studies.

We are also developing allogeneic or "off-the-shelf" cell therapies utilizing a
proprietary allogeneic platform. We have a strategic collaboration program
ongoing with Astellas (through its wholly owned subsidiary Universal Cells) in
relation to up to three targets with the aim of co-developing T-cell therapy
candidates directed to those targets and utilizing our allogeneic platform for
"off-the-shelf" cell therapies. The first target subject to the collaboration is
the mesothelin target to which a HiT cell therapy is being developed and a
second target has been nominated by Astellas. We also have a number of
development and research collaborations including our collaboration with GSK for
the development, manufacture and commercialization of TCR therapeutic candidates
for up to five programs, a clinical and preclinical alliance agreement with MD
Anderson Cancer Center and research collaborations with Alpine, Noile-Immune,
and the Center for Cancer Immune Therapy (CCIT).



Financial Operations Overview

Revenue

The Company has two contracts with customers: the GSK Collaboration and License Agreement and the Astellas Collaboration Agreement.

The GSK Collaboration Agreement



The GSK Collaboration and License Agreement consists of multiple performance
obligations. GSK nominated its third target under the Collaboration and License
Agreement in 2019, and the Company received $3.2 million following the
nomination of the target. The Company received a milestone payment of $4.2
million in the three months ended June 30, 2021 following achievement of a
development milestone. These amounts are being recognized as revenue as
development progresses.



The Company received a milestone payment of $4.2 million in the three months
ended June 30, 2021 following achievement of a development milestone for the
third target under the GSK Collaboration and License Agreement. As a result of
the inclusion of this amount in the transaction price, $1.0 million of revenue
was recognized in the three and six months ended June 30, 2021 from performance
obligations partially satisfied in previous periods.





The Astellas Collaboration Agreement



In January 2020, the Company entered into a collaboration agreement with
Astellas. The Company received $50.0 million as an upfront payment after
entering into the agreement. Under the agreement the parties will agree on up to
three targets and will co-develop T-cell therapies directed to those targets
pursuant to an agreed research plan. For each target, Astellas will fund
co-development up until completion of a Phase 1 trial for products directed to
such target. In addition, Astellas was also granted the right to develop,
independently of Adaptimmune, allogeneic T-cell therapy candidates directed to
two targets selected by Astellas. Astellas will have sole rights to develop and
commercialize products resulting from these two targets.

The agreement consists of the following performance obligations: (i) research
services and rights granted under the co-exclusive license for each of the three
co-development targets and (ii) the rights granted for each of the two
independent Astellas targets. The revenue allocated to the co-development
targets is recognized as the development of products directed to the targets
progresses up until completion of a Phase 1 trial. The revenue allocated to each
of the research licenses for the targets being independently developed by
Astellas will be recognized when the associated license commences, which is upon
designation of a target by Astellas.



Research and Development Expenses

Research and development expenditures are expensed as incurred. Research and development expenses consist principally of the following:





 ? salaries for research and development staff and related expenses, including
   benefits;


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? costs for production of preclinical compounds and drug substances by contract

manufacturers;

? fees and other costs paid to contract research organizations in connection with

additional preclinical testing and the performance of clinical trials;

? costs associated with the development of a process to manufacture and supply

our lentiviral vector and cell therapies for use in clinical trials;

? costs to develop manufacturing capability at our U.S. facility for manufacture

of cell therapies for use in clinical trials;

? costs relating to facilities, materials and equipment used in research and

development;

? costs of acquired or in-licensed research and development which does not have

alternative future use;

? costs of developing assays and diagnostics;

? an allocation of indirect costs clearly related to research and development;

? amortization and depreciation of property, plant and equipment and intangible

assets used to develop our cells therapies; and

? share-based compensation expenses.

These expenses are partially offset by:

? reimbursable tax and expenditure credits from the U.K. government.




As a company that carries out extensive research and development activities, we
benefit from the U.K. research and development tax credit regime for small and
medium sized companies ("SME R&D Tax Credit Scheme"), whereby our principal
research subsidiary company, Adaptimmune Limited, is able to surrender the
trading losses that arise from its research and development activities for a
payable tax credit of up to approximately 33.4% of eligible research and
development expenditures. Qualifying expenditures largely comprise employment
costs for research staff, consumables and certain internal overhead costs
incurred as part of research projects for which we do not receive income.
Subcontracted research expenditures are eligible for a cash rebate of up to
approximately 21.7%. A large proportion of costs in relation to our pipeline
research, clinical trials management and manufacturing development activities,
all of which are being carried out by Adaptimmune Limited, are eligible for
inclusion within these tax credit cash rebate claims.

Expenditures incurred in conjunction with our collaboration agreements are not
qualifying expenditures under the SME R&D Tax Credit Scheme but certain of these
expenditures can be reimbursed through the U.K. research and development
expenditure credit scheme (the "RDEC Scheme"). Under the RDEC Scheme tax relief
is given at 13% of allowable R&D costs, which may result in a payable tax credit
at an effective rate of approximately 10.5% of allowable R&D costs for the year
ended December 31, 2021.

Our research and development expenses may vary substantially from period to
period based on the timing of our research and development activities, which
depends upon the timing of initiation of clinical trials and the rate of
enrollment of patients in clinical trials. The duration, costs, and timing of
clinical trials and development of our cell therapies will depend on a variety
of factors, including:

? the scope, rate of progress, and expense of our ongoing as well as any

additional clinical trials and other research and development activities;

? uncertainties in clinical trial enrollment rates;

? future clinical trial results;

? significant and changing government regulation;




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? the timing and receipt of any regulatory approvals; and

? supply and manufacture of lentiviral vector and cell therapies for clinical

trials.


A change in the outcome of any of these variables may significantly change the
costs and timing associated with the development of that SPEAR T-cell. For
example, if the FDA, or another regulatory authority, requires us to conduct
clinical trials beyond those that we currently anticipate will be required for
regulatory approval, or if we experience significant delays in enrollment in any
of our clinical trials, we could be required to expend significant additional
financial resources and time on the completion of clinical development.

General and Administrative Expenses

Our general and administrative expenses consist principally of:

? salaries for employees other than research and development staff, including

benefits;

? business development expenses, including travel expenses;

? professional fees for auditors, lawyers and other consulting expenses;

? costs of facilities, communication, and office expenses;

? cost of establishing commercial operations;

? information technology expenses;

? amortization and depreciation of property, plant and equipment and intangible

assets not related to research and development activities; and

? share-based compensation expenses.

Other (Expense) Income, Net



Other (expense) income, net primarily comprises foreign exchange (losses) gains.
We are exposed to foreign exchange rate risk because we currently operate in the
United Kingdom and United States. Our expenses are generally denominated in the
currency in which our operations are located, which are the United Kingdom and
United States. However, our U.K.-based subsidiary incurs significant research
and development costs in U.S. dollars and, to a lesser extent, Euros. Our U.K.
subsidiary has an intercompany loan balance in U.S. dollars payable to the
ultimate parent company, Adaptimmune Therapeutics plc, which is considered of a
long-term investment nature as repayment is not planned or anticipated in the
foreseeable future. It is Adaptimmune Therapeutics plc's intent not to request
payment of the intercompany loan for the foreseeable future. The foreign
exchange gains or losses arising on the revaluation of intercompany loans of a
long-term investment nature are reported within other comprehensive (loss)
income, net of tax.



Our results of operations and cash flows will be subject to fluctuations due to
changes in foreign currency exchange rates, which could harm our business in the
future. We seek to minimize this exposure by maintaining currency cash balances
at levels appropriate to meet forthcoming expenditure in U.S. dollars and pounds
sterling. To date, we have not used hedging contracts to manage exchange rate
exposure, although we may do so in the future.

Taxation



We are subject to corporate taxation in the United Kingdom and the United
States. We incur tax losses and tax credit carryforwards in the United Kingdom.
No deferred tax assets are recognized on our U.K. losses and tax credit
carryforwards because there is currently no indication that we will make
sufficient taxable profits to utilize these tax losses and tax credit
carryforwards. On June 10, 2021, the U.K. 2021 Finance Bill received Royal
Assent. Under this bill, the rate of U.K. corporation tax will increase to 25%
in 2023, with lower rates and tapered relief to be applied to companies with
profits below £250,000.

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We benefit from reimbursable tax credits in the United Kingdom through the SME R&D Tax Credit Scheme as well as the RDEC Scheme which are presented as a deduction to research and development expenditure.


Our subsidiary in the United States has generated taxable profits due to a
Service Agreement between our U.S. and U.K. operating subsidiaries and is
subject to U.S. federal corporate income tax of 21%. Due to its activity in the
United States, and the sourcing of its revenue, the U.S. subsidiary is not
currently subject to any state or local income taxes. The Company also benefits
from the U.S Research Tax Credit and Orphan Drug Credit.

In the future, if we generate taxable income in the United Kingdom, we may
benefit from the United Kingdom's "patent box" regime, which would allow certain
profits attributable to revenues from patented products to be taxed at a rate of
10%. As we have many different patents covering our products, future upfront
fees, milestone fees, product revenues, and royalties may be taxed at this
favorably low tax rate.



U.K. Value Added Tax ("VAT") is charged on all qualifying goods and services by
VAT-registered businesses. An amount of 20% of the value of the goods or
services is added to all relevant sales invoices and is payable to the U.K. tax
authorities. Similarly, VAT paid on purchase invoices paid by Adaptimmune
Limited and Adaptimmune Therapeutics plc is reclaimable from the U.K. tax
authorities.

Critical Accounting Policies and Significant Judgments and Estimates



The preparation of our unaudited condensed consolidated financial statements
requires us to make estimates and assumptions that affect the reported amounts
of assets and liabilities, disclosure of contingent assets and liabilities, and
the revenues and expenses incurred during the reported periods. We base our
estimates on historical experience and on various other factors that we believe
are relevant under the circumstances, the results of which form the basis for
making judgments about the carrying value of assets and liabilities that are not
apparent from other sources. Actual results may differ from these estimates
under different assumptions or conditions. The accounting policies considered to
be critical to the judgments and estimates used in the preparation of our
financial statements are disclosed in the Management's Discussion and Analysis
of Financial Condition and Results of Operations included in our Annual Report
on Form 10-K for the year ended December 31, 2020.



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Results of Operations

Comparison of Three Months Ended June 30, 2021 and 2020



The following table summarizes the results of our operations for the
three months ended June 30, 2021 and 2020, together with the changes to those
items (in thousands):


                                          Three months ended
                                              June 30,
                                          2021          2020        Increase/decrease
Revenue                                $    3,095    $      502    $     2,593      517 %
Research and development expenses        (28,868)      (20,460)        (8,408)       41 %
General and administrative expenses      (13,539)      (10,295)        (3,244)       32 %
Total operating expenses                 (42,407)      (30,755)       (11,652)       38 %
Operating loss                           (39,312)      (30,253)        (9,059)       30 %
Interest income                               266         1,147          (881)     (77) %
Other expense, net                             54         (749)            803    (107) %
Loss before income taxes                 (38,992)      (29,855)        (9,137)       31 %
Income taxes                                 (76)          (25)           (51)      204 %
Loss for the period                    $ (39,068)    $ (29,880)    $   (9,188)       31 %




Revenue

Revenue was $3.1 million in the three months ended June 30, 2021 compared to
$0.5 million for the three months ended June 30, 2020. Revenue has increased
primarily due to an increase in development activities under the Astellas
Collaboration Agreement. Revenue varies depending on the progress of development
activities and the amounts we expect to receive under contracts with customers
(to the extent that it is probable that a significant reversal in the amount of
cumulative revenue recognized will not occur).



Research and Development Expenses

Research and development expenses increased by 41% to $28.9 million for the three months ended June 30, 2021 from $20.5 million for the three months ended June 30, 2020.



Our research and development expenses comprise the following (in thousands):


                                                         Three months ended
                                                             June 30,
                                                         2021         2020         Increase/decrease
Salaries, materials, equipment, depreciation of
property, plant and equipment and other
employee-related costs(1)                              $  19,222    $  14,881    $       4,341      29 %
Subcontracted expenditure                                 11,410        7,129            4,281      60 %
Manufacturing facility expenditure                         2,096        1,367              729      53 %
Share-based compensation expense                           2,512          929            1,583     170 %
Reimbursements receivable for research and
development tax and expenditure credits                  (6,372)      (3,846)          (2,526)      66 %
                                                       $  28,868    $  20,460    $       8,408      41 %




 (1) These costs are not analyzed by project since employees may be engaged in
     multiple projects simultaneously.


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The net increase in our research and development expenses of $8.4 million for
the three months ended June 30, 2021 compared to the same period in 2020 was
primarily due to the following:

an increase of $4.3 million in salaries, materials, equipment, depreciation of

? property, plant and equipment and other employee-related costs, which is mainly

driven by an increase in the average number of employees engaged in research

and development;

an increase of $4.3 million in subcontracted expenditure due to increases in

? costs related to the development of a companion diagnostic assay and an

increase in clinical trial costs as we prepare for a Phase 2 clinical trial

with ADP-A2M4CD8 in esophageal and esophagogastric ("EGJ") cancers;

an increase of $1.6 million in share-based compensation expense primarily due

? to higher option grants in 2021 because of an increase in the number of

employees and higher fair value of options being expensed; and

an increase of $2.5 million in reimbursements receivable for research and

? development tax and expenditure credits, which is driven by an increase in

qualifying costs identified.

Our subcontracted costs for the three months ended June 30, 2021 were $11.4 million, compared to $7.1 million in the same period of 2020. This includes $9.1 million of costs directly associated with our afami-cel, ADP-A2M4CD8 and ADP-A2AFP SPEAR T-cells and $2.3 million of other development costs.





Our research and development expenses are highly dependent on the phases and
progression of our research projects and will fluctuate depending on the outcome
of ongoing clinical trials. We expect that our research and development expenses
will increase in future periods as we continue to invest in our translational
sciences and other research and development capabilities.

General and Administrative Expenses



General and administrative expenses increased by 32% to $13.5 million for the
three months ended June 30, 2021 from $10.3 million in the same period in 2020.
Our general and administrative expenses consist of the following (in thousands):




                                        Three months ended
                                            June 30,
                                        2021         2020             Increase/decrease
Salaries, depreciation of
property, plant and equipment and
other employee-related costs          $   7,327    $   6,000       $      1,327         22 %
Other corporate costs                     4,729        3,797                932         25 %
Share-based compensation expense          2,936        1,694              1,242         73 %
Reimbursements                          (1,453)      (1,196)              (257)         21 %
                                      $  13,539    $  10,295       $      3,244         32 %






The net increase in our general and administrative expenses of $3.2 million for
the three months ended June 30, 2021 compared to the same period in 2020 was
largely due to:

an increase of $1.3 million in salaries, depreciation of property, plant and

? equipment and other employee-related costs, as a result of an increase in the

average number of employees in the three months ended June 30, 2021 compared to

the same period in 2020; and

? an increase of $1.2 million in share based compensation, because of an increase

in the number of employees and higher fair value of options being expensed.

We expect that our general and administrative expenses will increase in the future as we expand our operations and move towards commercial launch.



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Income Taxes

Income taxes increased to a charge $76,000 for the three months ended
June 30, 2021 from a charge of $25,000 for the three months ended June 30, 2020.
Income taxes arise in the United States due to our U.S. subsidiary generating
taxable profits. We incur losses in the United Kingdom.

Comparison of Six Months Ended June 30, 2021 and 2020



The following table summarizes the results of our operations for the six months
ended June 30, 2021 and 2020, together with the changes to those items (in
thousands):


                                           Six months ended
                                              June 30,
                                          2021          2020         Increase/decrease
Revenue                                $    3,529    $    1,263    $       2,266     179 %
Research and development expenses        (53,374)      (41,724)         (11,650)      28 %
General and administrative expenses      (27,356)      (19,556)          (7,800)      40 %
Total operating expenses                 (80,730)      (61,280)         (19,450)      32 %
Operating loss                           (77,201)      (60,017)         (17,184)      29 %
Interest income                               691         1,877          (1,186)    (63) %
Other (expense) income, net                    53           188            (135)    (72) %
Loss before income taxes                 (76,457)      (57,952)         (18,505)      32 %
Income taxes                                (374)          (95)            (279)     294 %
Loss for the period                    $ (76,831)    $ (58,047)    $    (18,784)      32 %




Revenue

Revenue was $3.5 million in the six months ended June 30, 2021 compared to $1.3
million for the six months ended June 30, 2020. Revenue has increased primarily
due to an increase in development activities under the Astellas Collaboration
Agreement. Revenue varies depending on the progress of development activities
and the amounts we expect to receive under contracts with customers (to the
extent that it is probable that a significant reversal in the amount of
cumulative revenue recognized will not occur).



Research and Development Expenses

Research and development expenses increased by 28% to $53.4 million for the six months ended June 30, 2021 from $41.7 million for the six months ended June 30, 2020.



Our research and development expenses comprise the following (in thousands):


                                                          Six months ended
                                                              June 30,
                                                          2021         2020        Increase/decrease
Salaries, materials, equipment, depreciation of
property, plant and equipment and other
employee-related costs(1)                              $   38,424    $  30,263    $      8,161      27 %
Subcontracted expenditure                                  22,242       14,598           7,644      52 %
Manufacturing facility expenditure                          4,541        3,054           1,487      49 %
Share-based compensation expense                            4,887        1,907           2,980     156 %
In-process research and development costs                     151          812           (661)    (81) %
Reimbursements receivable for research and
development tax and expenditure credits                  (16,871)      (8,910)         (7,961)      89 %
                                                       $   53,374    $  41,724    $     11,650      28 %




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(1) These costs are not analyzed by project since employees may be engaged in

multiple projects simultaneously.

The net increase in our research and development expenses of $11.7 million for the six months ended June 30, 2021 compared to the same period in 2020 was primarily due to the following:

an increase of $8.2 million in salaries, materials, equipment, depreciation of

? property, plant and equipment and other employee-related costs, which is mainly

driven by an increase in the average number of employees engaged in research

and development;

an increase of $7.6 million in subcontracted expenditure due to increases in

? costs related to the development of a companion diagnostic assay and an

increase in clinical trial costs as we prepare for a Phase 2 clinical trial

with ADP-A2M4CD8 in EGJ cancers;

an increase of $3.0 million in share-based compensation expense primarily

? because of an increase in the number of employees and higher fair value of

options being expensed; and

an increase of $8.0 million in reimbursements receivable for research and

? development tax and expenditure credits, which is driven by an increase in

qualifying costs identified.




Our subcontracted costs for the six months ended June 30, 2021 were $22.2
million, compared to $14.6 million in the same period of 2020. This includes
$16.9 million of costs directly associated with our afami-cel, ADP-A2M4CD8 and
ADP-A2AFP SPEAR T-cells and $5.3 million of other development costs.



Our research and development expenses are highly dependent on the phases and
progression of our research projects and will fluctuate depending on the outcome
of ongoing clinical trials. We expect that our research and development expenses
will increase in future periods as we continue to invest in our translational
sciences and other research and development capabilities.

General and Administrative Expenses



General and administrative expenses increased by 40% to $27.4 million for the
six months ended June 30, 2021 from $19.6 million in the same period in 2020.
Our general and administrative expenses consist of the following (in thousands):




                                         Six months ended
                                            June 30,
                                        2021         2020            Increase/decrease
Salaries, depreciation of
property, plant and equipment and
other employee-related costs          $  14,292    $  11,759       $     2,533         22 %
Other corporate costs                     8,621        6,828             1,793         26 %
Share-based compensation expense          5,896        2,165             3,731        172 %
Reimbursements                          (1,453)      (1,196)             (257)         21 %
                                      $  27,356    $  19,556       $     7,800         40 %





The net increase in our general and administrative expenses of $7.8 million for the six months ended June 30, 2021 compared to the same period in 2020 was largely due to:

an increase of $2.5 million in salaries, depreciation of property, plant and

? equipment and other employee-related costs, as a result of an increase in the

average number of employees in the six months ended June 30, 2021 compared to

the same period in 2020;

an increase of $1.8 million in other corporate costs, primarily due to

? increases in employee-related costs, share-based compensation expense, and


   professional fees in the six months ended June 30, 2021 compared to the same
   period in


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  2020; and

an increase of $3.7 million in share based compensation, due to option forfeits

? in the six months ended June 30, 2020, and because of an increase in the number

of employees and higher fair value of options being expensed in the six months

ended June 30, 2021.

We expect that our general and administrative expenses will increase in the future as we expand our operations and move towards commercial launch.







Income Taxes

Income taxes increased to a charge of $374,000 for the six months ended
June 30, 2021 from a charge of $95,000 for the six months ended June 30, 2020.
Income taxes arise in the United States due to our U.S. subsidiary generating
taxable profits. We incur losses in the United Kingdom.

Liquidity and Capital Resources

Sources of Funds



Since our inception, we have incurred significant net losses and negative cash
flows from operations. We financed our operations primarily through sales of
equity securities, cash receipts under our collaboration arrangements and
research and development tax and expenditure credits. From inception through to
June 30, 2021, we have raised:

 ? $857.0 million, net of issuance costs, through the issuance of shares;

? $208.0 million through collaborative arrangements with GSK and Astellas; and

? $59.2 million in the form of reimbursable U.K. research and development tax

credits and receipts from the U.K. RDEC Scheme.




We use a non-GAAP measure, Total Liquidity, which is defined as the total of
cash and cash equivalents and marketable securities, to evaluate the funds
available to us in the near-term. A description of Total Liquidity and
reconciliation to cash and cash equivalents, the most directly comparable U.S.
GAAP measure, are provided below under "Non-GAAP measures".

As of June 30, 2021, we had cash and cash equivalents of $50.5 million and Total
Liquidity of $285.4 million. We regularly assess Total Liquidity against our
activities and make decisions regarding prioritization of those activities and
deployment of Total Liquidity. We believe that our Total Liquidity will be
sufficient to fund our operations, based upon our currently anticipated research
and development activities, planned capital spending, and planned
commercialization costs into early 2023. This belief is based on estimates that
are subject to risks and uncertainties and may change if actual results differ
from management's estimates.



Cash Flows

The following table summarizes the results of our cash flows for the six months ended June 30, 2021 and 2020 (in thousands).




                                                            Six months ended
                                                                June 30,
                                                          2021          2020
Net cash used in operating activities                  $ (77,999)    $   

(8,058)

Net cash provided by (used in) investing activities 69,440 (258,952) Net cash provided by financing activities

                   3,097        

339,463


Cash, cash equivalents and restricted cash                 55,085        126,683




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Operating Activities

Net cash used in operating activities was $78.0 million for the six months ended
June 30, 2021 compared to $8.1 million for the six months ended June 30, 2020.
The receipt of the $50.0 million upfront payment from Astellas in January 2020
resulted in lower net cash used in operating activities for the six months ended
June 30, 2020. Excluding the impact of this, the net cash used in operating
activities for the six months ended June 30, 2021 increased due to an increase
in operating expenditure.

Net cash used in operating activities of $78.0 million for the six months ended
June 30, 2021 comprised a net loss of $76.8 million and a net cash outflow of
$18.9 million from changes in operating assets and liabilities, offset by
non-cash items of $17.7 million. The changes in operating assets and liabilities
include the impact of a $16.8 million increase in reimbursements receivable for
research and development tax credits. The non-cash items consisted of
depreciation expense on plant and equipment of $2.9 million, share-based
compensation expense of $10.8 million, amortization on available-for-sale debt
securities of $2.9 million, and other items of $1.4 million, which were offset
by unrealized foreign exchange gains of $0.3 million.

Investing Activities



Net cash provided by investing activities was $69.4 million for the six months
ended June 30, 2021 compared to net cash used in investing activities of $259.0
million for the six months ended June 30, 2020. The net cash provided by (used
in) investing activities for the respective periods consisted primarily of:

? purchases of property and equipment of $2.9 million and $0.5 million for the

six months ended June 30, 2021 and 2020, respectively;

cash outflows from investment in marketable securities of $82.0 million and

$298.0 million for the six months ended June 30, 2021 and 2020, respectively,

? and cash inflows from maturity or redemption of marketable securities of $154.5

million and $39.9 million for the six months ended June 30, 2021 and 2020,

respectively.




The Company invests surplus cash and cash equivalents in marketable securities.
In the six months ended June 30, 2021, the investments in marketable securities
were reduced to fund the Company's ongoing operations. In the six months ended
June 30, 2020, the Company increased its investments in marketable securities
with proceeds from its public offerings.

Financing Activities



Net cash provided by financing activities was $3.1 million and $339.5 million
for the six months ended June 30, 2021 and 2020, respectively. The net cash
provided by financing activities in the six months ended June 30, 2021 consisted
of net proceeds of $2.5 million from shares issued in an at-the-market offering,
net of commissions and issuance costs, and proceeds of $0.6 million from share
option exercises. For the six months ended June 30, 2020, the net cash provided
by financing activities consisted of net proceeds from public offerings of
$334.3 million and proceeds from share option exercises of $5.1 million.



Non-GAAP Measures

Total Liquidity (a non-GAAP financial measure)



Total Liquidity (a non-GAAP financial measure) is the total of cash and cash
equivalents and marketable securities. Each of these components appears in the
condensed consolidated balance sheet. The U.S. GAAP financial measure most

directly comparable to Total

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Liquidity is cash and cash equivalents as reported in the condensed consolidated
financial statements, which reconciles to Total Liquidity as follows (in
thousands):


                                                               June 30,       December 31,
                                                                  2021            2020
Cash and cash equivalents                                      $   50,453    $        56,882

Marketable securities - available-for-sale debt securities        234,917  

         311,335
Total Liquidity                                                $  285,370    $       368,217




We believe that the presentation of Total Liquidity provides useful information
to investors because management reviews Total Liquidity as part of its
management of overall liquidity, financial flexibility, capital structure and
leverage. The definition of Total Liquidity includes investments, which are
highly-liquid and available to use in our current operations, such as marketable
securities.

Off-Balance Sheet Arrangements


We did not have during the periods presented, and we do not currently have, any
off-balance sheet arrangements, as defined in the rules and regulations of

the
SEC.

Contractual Obligations

Further details of potential contingencies and commitments are provided in Note 10 of the condensed consolidated financial statements.

For a discussion of our contractual obligations, see "Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" in our 2020 Annual Report on Form 10-K.

Safe Harbor

See the section titled "Information Regarding Forward-Looking Statements" at the beginning of this Quarterly Report.

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