Item 8.01. Other Events.



As previously disclosed, on August 30, 2021, ADTRAN, Inc., a Delaware
corporation ("ADTRAN"), and ADVA Optical Networking SE, a company organized and
existing under the laws of Germany ("ADVA"), entered into a business combination
agreement (the "Business Combination Agreement"), pursuant to which both
companies agreed to combine their respective businesses and each become
subsidiaries of a new holding company, Acorn HoldCo, Inc., a Delaware
corporation and currently a wholly-owned direct subsidiary of ADTRAN ("Acorn
HoldCo"). Under the terms of the Business Combination Agreement, Acorn MergeCo,
Inc., a newly formed Delaware corporation and wholly-owned direct subsidiary of
Acorn HoldCo ("Merger Sub"), will merge with and into ADTRAN, with ADTRAN
surviving the merger (the "Merger") as a wholly-owned direct subsidiary of Acorn
HoldCo. Acorn HoldCo has also made a public exchange offer to exchange each
issued and outstanding no-par value bearer share of ADVA, pursuant to which each
ADVA share tendered and accepted for exchange will be exchanged for 0.8244
shares of common stock of Acorn HoldCo (the "Exchange Offer", and together with
the Merger, the "Business Combination").

On November 26, 2021, Acorn HoldCo filed a Registration Statement on
Form S-4 (No. 333-259251) (the "Registration Statement") with the U.S.
Securities and Exchange Commission ("SEC") that includes (1) a proxy statement
of ADTRAN in connection with the special meeting of the stockholders of ADTRAN
to consider and vote on a proposal to adopt the Business Combination Agreement
that also constitutes a prospectus for Acorn HoldCo (the "Proxy
Statement/Prospectus") and (2) an offering prospectus of Acorn HoldCo to be used
in connection with Acorn HoldCo's offer to acquire ADVA shares held by U.S.
holders. On December 2, 2021, the Registration Statement was declared effective
by the SEC and ADTRAN filed the definitive Proxy Statement/Prospectus with the
SEC and commenced mailing the Proxy Statement/Prospectus to ADTRAN stockholders.

On October 12, 2021, October 18, 2021, December 17, 2021, December 20, 2021,
December 22, 2021 and December 23, 2021, respectively, ADTRAN received six
letters (collectively, the "Demands") from purported stockholders alleging that
the Proxy Statement/Prospectus was materially false and/or misleading. Two of
the letters attached draft complaints.

ADTRAN believes that the disclosures set forth in the Proxy Statement/Prospectus
comply fully with applicable law and that the allegations contained in the
Demands are without merit. However, in order to preclude any efforts to delay
the closing of the Business Combination, avoid nuisance and alleviate the costs,
distractions, risks and uncertainties inherent in litigation, ADTRAN has
determined to voluntarily supplement the Proxy Statement/Prospectus with
certain supplemental disclosures (the "Supplemental Disclosures") as described
in the following section entitled "Supplemental Disclosures to the Proxy
Statement/Prospectus" in this Current Report on Form 8-K ("Current Report").
Nothing in this Current Report shall be deemed an admission of the legal
necessity or materiality under applicable laws of any of the disclosures set
forth herein. To the contrary, ADTRAN specifically denies all allegations by the
purported ADTRAN stockholders in the Demands that any additional disclosure was
or is required. ADTRAN's board of directors continues to recommend that ADTRAN
stockholders vote "FOR" each proposal being submitted to a vote of the ADTRAN
stockholders at the special meeting.

Supplemental Disclosures to the Proxy Statement/Prospectus



The following supplemental information should be read in conjunction with the
Proxy Statement/Prospectus, which should be read in its entirety. All page
references are to pages in the Proxy Statement/Prospectus, and terms used below,
unless otherwise defined, have the meanings set forth in the Proxy
Statement/Prospectus. Underlined text shows text being added to a referenced
disclosure in the Proxy Statement/Prospectus, and deleted text is stricken
through.

--------------------------------------------------------------------------------
The third full paragraph on page 90 of the Proxy Statement/Prospectus under the
section "The Business Combination -Background of the Business Combination" is
amended and supplemented to read as follows:

Following a discussion between Mr. Stanton and Mr. Protiva on July 11, 2019 on
the merits of combining ADTRAN and ADVA to create a stronger network solutions
vendor, it was determined that ADTRAN and ADVA should enter into a mutual
nondisclosure agreement to further enable detailed exploration of a potential
combination of the two companies. On July 16, 2019, ADTRAN and ADVA entered into
a mutual nondisclosure agreement, governing the terms and conditions under which
the parties would exchange information in order to further assess the merits and
risks of a potential business combination. The mutual nondisclosure agreement
did not include a standstill provision. Neither ADTRAN nor ADVA executed any
other nondisclosure agreement with a third party in connection with a potential
alternate business combination.

The third and fourth full paragraphs on page 92 of the Proxy Statement/Prospectus under the section "The Business Combination -Background of the Business Combination" are amended and supplemented to read as follows:



On January 13, 2021, the ADTRAN board of directors held a special virtual
meeting attended by senior management of ADTRAN, and representatives of BofA
Securities to discuss continuing discussions with ADVA. At the meeting,
management and BofA Securities reviewed with the ADTRAN board of directors the
potential benefits of a business combination with ADVA, including the
opportunity for significant synergies, as well as the potential risks of the
business combination, including integration and synergy realization risks. The
ADTRAN board of directors also discussed with management and representatives of
BofA Securities the pro forma ownership levels discussed between Mr. Stanton and
the representatives of Jefferies at the January 5, 2021 meeting. The ADTRAN
board of directors expressed support for, and authorized representatives of
ADTRAN management, including Mr. Stanton, to continueing discussions with ADVA
management.

Following authorization from the ADTRAN Board, Oon January 15, 2021, senior
management of ADTRAN and ADVA, and representatives of BofA Securities and
Jefferies, held a virtual meeting to continue discussions of the proposed
transaction between the parties. At the virtual meeting, representatives of BofA
Securities and ADTRAN presented illustrative transaction terms for
a stock-for-stock merger between ADTRAN and ADVA and provided an overview of the
potential benefits of the business combination to the combined company and each
company's shareholders. The terms presented included (i) a 10% implied premium,
resulting in ADVA pro forma ownership of 42% of the combined company, (ii) a
management team led by Mr. Stanton, as chief executive officer and (iii) board
representation at the combined company for each of ADTRAN and ADVA.

The first full paragraph on page 94 of the Proxy Statement/Prospectus under the
section "The Business Combination -Background of the Business Combination" is
amended and supplemented to read as follows:

On May 28, 2021, the term sheet, which was substantially similar to the term
sheet presented to the ADTRAN Board at the April 28 meeting, was executed by
ADTRAN and ADVA.

The disclosure in the section entitled "Certain Unaudited Prospective Financial
Information", beginning on page 102 of the Proxy Statement/Prospectus, is hereby
modified by replacing the sub-sections titled "Summary of the Prospective
Financial Information" on pages 105 and 106 of the Proxy Statement/Prospectus
with the tables and text below.

--------------------------------------------------------------------------------
              Summary of the Prospective Financial Information(1)

                      (in millions, expect per share data)



                                                                   Year Ending December 31,
                                              2021E       2022E       2023E       2024E       2025E       2026E
Revenue                                       $  563      $  620      $ 

684 $ 711 $ 740 $ 770 Income Before Provision for Income Taxes $ 24 $ 45 $ 69 $ 78 $ 88 $ 97



Plus: Stock-Based Compensation                $    7      $    7      $    7      $    7      $    7      $    7
Plus: Acquisition Related Expenses,
Amortizations and Adjustments                 $    4      $    4      $    3      $    3      $    3      $    3
Plus: Restructuring                           $    0          -           -           -           -           -
Plus: Deferred Compensation Adjustments       $    1          -           -           -           -           -
Plus: Pension                                 $    1      $    1      $    1      $    1      $    1      $    1
Adjusted Income Before Provision for Income
Taxes(2)                                      $   37      $   56      $   

80 $ 89 $ 98 $ 107



Plus: Other Expenses / (Income)               ($   6 )    ($   4 )    ($   4 )    ($   5 )    ($   7 )    ($   8 )
Plus: D&A                                     $   11      $   11      $   11      $   11      $   13      $   14
Adjusted EBITDA(2)                            $   41      $   63      $   87      $   95      $  104      $  113




                                                                    Year Ending December 31,
                                             2021E        2022E        2023E        2024E        2025E        2026E
Adjusted Income Before Provision for
Income Taxes(2)                             $    37      $    56      $    80      $    89      $    98      $   107

Less: Taxes                                 ($    8 )    ($   13 )    ($   18 )    ($   20 )    ($   23 )    ($   25 )
Adjusted Net Income(2)                      $    29      $    44      $    62      $    68      $    76      $    83

Shares Outstanding                             49.4         49.4         49.4         49.4         49.4         49.4
Adjusted Earnings Per Share(2)              $  0.59      $  0.88      $  1.24      $  1.38      $  1.53      $  1.67




    (1)  ADTRAN unaudited prospective financial information was prepared as of
         August 17, 2021.

(2) Adjusted EBITDA, adjusted income before provision for income taxes,

adjusted net income and adjusted earnings per share are not GAAP

measures. For purposes of the prospective financial information,

(i) adjusted EBITDA is defined as earnings before interest, taxes,

depreciation and amortization, excluding stock-based compensation expense

and certain non-recurring items and (ii) adjusted earnings per share is

defined as earnings per share, plus tax-effected stock-based compensation

expense, acquisition-related expenses, amortizations and adjustments,

restructuring expenses, amortization of pension actuarial losses,

non-cash deferred compensation, change in valuation allowance related to


         our deferred tax assets, and certain other non-recurring items.


Additional ADTRAN Prospective Financial Information. At the direction of ADTRAN
management, BofA Securities prepared a calculation of unlevered, after-tax cash
flow figures for use in BofA Securities' discounted cash flow analysis based on
the ADTRAN forecasts summarized above under the heading "ADTRAN Prospective
Financial Information". The results of this calculation, as approved for BofA
Securities' use by ADTRAN management, are set forth in the following table. They
do not form part of the ADTRAN forecasts.



                                                                          Year Ending December 31,
                                              2H
                                             2021E        2022E        2023E        2024E        2025E        2026E
Adjusted EBITDA                             $    23      $    63      $    

87 $ 95 $ 104 $ 113



Less: D&A                                   ($    5 )    ($   11 )    ($   11 )    ($   11 )    ($   13 )    ($   14 )
Adjusted EBIT                               $    18      $    52      $    

76 $ 84 $ 91 $ 99



Less: Tax Expense                           ($    4 )    ($   12 )    ($   17 )    ($   19 )    ($   21 )    ($   23 )
Effective Tax Rate                             21.0 %       22.5 %       22.9 %       23.1 %       23.0 %       23.0 %
Tax-Effected Adjusted EBIT                  $    14      $    41      $    

58 $ 64 $ 70 $ 77



Plus: D&A                                   $     5      $    11      $    11      $    11      $    13      $    14
Less: Capital Expenditures                  ($    8 )    ($   10 )    ($   11 )    ($   11 )    ($   12 )    ($   12 )
Less: Increase in Net Working Capital       $    19      $     3      ($    7 )    ($    2 )    ($    3 )    ($    3 )
Unlevered Free Cash Flow(1)                 $    30      $    45      $    51      $    62      $    68      $    75

(1) Unlevered free cash flow is not a GAAP measure. For purposes of the

prospective financial information unlevered free cash flow is defined

as tax-effected operating income, plus depreciation and amortization,

less capital expenditures, less changes in working capital.

--------------------------------------------------------------------------------


ADVA Prospective Financial Information. The following prospective financial
information used by BofA Securities in performing its financial analyses with
respect to ADVA on a stand-alone basis, was provided by ADVA to ADTRAN, and
provided by ADTRAN management to BofA Securities and approved by ADTRAN for use
by BofA Securities:

              Summary of the Prospective Financial Information(1)

                      (in millions, expect per share data)



                                                                   Year Ending December 31,
                                            2021E        2022E        2023E        2024E        2025E        2026E
Revenue                                    €   600      €   640      €   672      €   700      €   730      €   760
Net Income (IFRS)                          €    44      €    45      €    47      €    52      €    57      €    61

Plus: Taxes                                €     3      €     5      €    11      €    12      €    13      €    14
Plus: Financial Result                     €     1      €     3      €     2      €     2      €     2      €     2
Plus: FX Effect                               (€ 1 )         -            -            -            -            -
Plus: D&A                                  €    69      €    70      €    73      €    77      €    80      €    80
EBITDA (IFRS)                              €   117      €   123      €   133      €   143      €   152      €   158

Plus: Compensation                         €     1      €     2      €     2      €     2      €     2      €     2
Plus: Amortization of Intangibles excl.
Goodwill                                   €     4      €     6      €     6      €     6      €     6      €     6
Adjusted EBITDA (IFRS)                     €   123      €   130      €   140      €   151      €   160      €   165

Less: R&D Capitalization                     (€ 43 )      (€ 45 )      (€ 47 )      (€ 48 )      (€ 49 )      (€ 50 )
Adjusted EBITDA(2)                         €    80      €    85      €    94      €   103      €   111      €   115




                                                                    Year Ending December 31,
                                             2021E        2022E        2023E        2024E        2025E        2026E
Net Income (IFRS)                           €    44      €    45      €    47      €    52      €    57      €    61

Plus: FX Effect                                (€ 1 )         -            -            -            -            -
Plus: Compensation                          €     1      €     2      €     2      €     2      €     2      €     2
Plus: Amortization of Intangibles excl.
Goodwill                                    €     4      €     6      €     6      €     6      €     6      €     6
Plus: R&D Amortization                      €    44      €    45      €    47      €    48      €    49      €    50
Less: R&D Capitalization                      (€ 43 )      (€ 45 )      (€ 47 )      (€ 48 )      (€ 49 )      (€ 50 )
Adjusted Net Income(2)                      €    51      €    53      €    54      €    59      €    64      €    69

Shares Outstanding                             50.8         50.8         50.8         50.8         50.8         50.8
Adjusted Earnings Per Share(2)              €  1.00      €  1.04      €  1.06      €  1.16      €  1.27      €  1.36




    (1)  ADVA projections were provided by ADVA management to ADTRAN on a U.S.

GAAP basis. ADVA reports on an IFRS basis, however, the IFRS projections

were adjusted for any known differences to U.S. GAAP, particularly

related to capitalized R&D effects. ADVA unaudited prospective financial

information was prepared as of July 13, 2021.

(2) Adjusted EBITDA, adjusted net income and adjusted earnings per share are

not GAAP measures. For purposes of the prospective financial information,

(i) adjusted EBITDA is defined as earnings before interest, taxes,

depreciation and amortization, excluding stock-based compensation expense

and certain non-recurring items; (ii) adjusted net income is calculated

as net income adjusted to exclude stock based compensation expense,

amortization of intangible assets and foreign exchange effects and

(iii) adjusted earnings per share was arrived at by dividing the adjusted

net income provided by ADVA by the ADVA share count. 2021- 2026 Adjusted


         EPS projections are based on diluted shares outstanding implied by 2020
         Net Income and Adjusted EPS.

--------------------------------------------------------------------------------


Additional ADVA Prospective Financial Information. At the direction of ADTRAN
management, BofA Securities prepared a calculation of unlevered, after-tax cash
flow figures for use in BofA Securities' discounted cash flow analysis based on
the ADVA forecasts summarized above under the heading "ADVA Prospective
Financial Information". The results of this calculation, as approved for BofA
Securities' use by ADTRAN management, are set forth in the following table. They
do not form part of the ADVA forecasts.



                                                                          Year Ending December 31,
                                              2H
                                             2021E        2022E        2023E        2024E        2025E        2026E
Adjusted EBITDA                                € 40         € 85         € 94        € 103        € 111        € 115

Less: D&A                                     (€ 13 )      (€ 25 )      (€ 26 )      (€ 29 )      (€ 31 )      (€ 30 )
Adjusted EBIT                                  € 27         € 60         € 68         € 73         € 80         € 86

Less: Tax Expense                              (€ 2 )       (€ 6 )      (€ 13 )      (€ 14 )      (€ 15 )      (€ 16 )
Effective Tax Rate                              6.6 %       10.0 %       19.2 %       18.9 %       18.9 %       18.9 %

Tax-Effected Adjusted EBIT                     € 25         € 54         € 55         € 60         € 65         € 69

Plus: D&A                                      € 13         € 25         € 26         € 29         € 31         € 30
Less: Capital Expenditures                    (€ 18 )      (€ 32 )     

(€ 29 ) (€ 21 ) (€ 22 ) (€ 23 ) Less: Increase in Net Working Capital (€ 4 ) (€ 1 )

(€ 5 ) (€ 6 ) (€ 5 ) (€ 6) Unlevered Free Cash Flow(1)

                    € 17         € 47         € 47         € 61         € 69         € 71




    (1)  Unlevered free cash flow is not a GAAP measure. For purposes of the
         prospective financial information unlevered free cash flow is defined

as tax-effected operating income, plus depreciation and amortization,

less capital expenditures, less changes in working capital.

--------------------------------------------------------------------------------

The disclosure on page 112 of the Proxy Statement/Prospectus under the section "The Business Combination-Opinion of Financial Advisor to ADTRAN-Summary of Material Financial Analyses-ADTRAN Financial Analyses-Discounted Cash Flow Analysis" is amended and supplemented to read as follows:



Discounted Cash Flow Analysis. BofA Securities performed a discounted cash flow
analysis of ADTRAN to calculate the estimated present value of the standalone
unlevered, after-tax free cash flows Unlevered Free Cash Flows as described in
the section entitled "The Business Combination-Certain Unaudited Prospective
Financial Information" that ADTRAN was forecasted to generate during the third
and fourth quarters of calendar year 2021 and calendar years 2022 through 2026
based on the ADTRAN forecasts. BofA Securities calculated terminal values for
ADTRAN by applying perpetuity growth rates of 2.0% to 3.0%, based on BofA
Securities' professional judgment and experience, to ADTRAN's calendar year 2026
estimated normalized unlevered free cash flow. The cash flows and terminal
values were then discounted to present value as of June 30, 2021, assuming a
mid-year convention, using discount rates ranging from 8.0% to 11.0%, which were
based on an estimate of ADTRAN's weighted average cost of capital, derived using
the capital asset pricing model (which takes into account the risk free rate,
ADTRAN's levered beta and the applicable equity market risk premium) and BofA
Securities' professional judgement and experience. To the resulting enterprise
values, BofA Securities added net cash projected as of June 30, 2021 of
$128 million to derive equity values. This analysis indicated the following
approximate implied per share equity value reference ranges for ADTRAN (rounded
to the nearest $0.25) as compared to the closing share price of the ADTRAN
shares on August 27, 2021:

The disclosure on page 113 of the Proxy Statement/Prospectus under the section
"The Business Combination-Opinion of Financial Advisor to ADTRAN-Summary of
Material Financial Analyses-ADTRAN Financial Analyses-Selected Publicly Traded
Companies Analysis" is amended and supplemented by adding columns for 2022 and
2023 EV/Revenue, EV/EBITDA and Adjusted EPS multiples to the list of selected
publicly traded companies as follows:



                                   EV/Revenue       EV/Revenue       EV/EBITDA       EV/EBITDA       Adj. EPS       Adj. EPS
                                   2022             2023             2022            2023            2022           2023
ADVA                                      1.00x            0.96x            8.2x            7.5x          15.3x          15.0x
Ciena Corporation                         2.11x               NA           10.9x              NA          17.4x             NA
Infinera Corporation                      1.48x            1.37x           11.2x            8.9x          26.0x          12.8x
Ribbon Communications, Inc.               1.32x            1.31x            7.7x            7.6x          11.6x          12.1x
Casa Systems, Inc.                        1.64x            1.54x            9.4x            8.4x          15.9x          13.1x
Tejas Networks Ltd.                       3.31x               NA           14.9x              NA          26.4x             NA
NeoPhotonics Corporation                  1.22x            1.02x           10.9x            9.2x          35.4x          20.1x


--------------------------------------------------------------------------------
The disclosure on page 114 of the Proxy Statement/Prospectus under the section
"The Business Combination-Opinion of Financial Advisor to ADTRAN-Summary of
Material Financial Analyses-ADVA Financial Analyses-Selected Publicly Traded
Companies Analysis" is amended and supplemented by adding columns for 2022 and
2023 EV/Revenue, EV/EBITDA and Adjusted EPS multiples to the list of selected
publicly traded companies as follows:



                                           EV/Revenue   EV/Revenue   EV/EBITDA   EV/EBITDA   Adj. EPS   Adj. EPS
                                           2022         2023         2022        2023        2022       2023
ADTRAN                                          1.81x        1.66x       19.2x       14.6x      30.5x      19.2x
Ciena Corporation                               2.11x           NA       10.9x          NA      17.4x         NA
Infinera Corporation                            1.48x        1.37x       11.2x        8.9x      26.0x      12.8x
Ribbon Communications, Inc.                     1.32x        1.31x        7.7x        7.6x      11.6x      12.1x
Casa Systems, Inc.                              1.64x        1.54x        9.4x        8.4x      15.9x      13.1x
Tejas Networks Ltd.                             3.31x           NA       14.9x          NA      26.4x         NA
NeoPhotonics Corporation                        1.22x        1.02x       

10.9x 9.2x 35.4x 20.1x




The disclosure on page 114 of the Proxy Statement/Prospectus under the section
"The Business Combination-Opinion of Financial Advisor to ADTRAN-Summary of
Material Financial Analyses-ADVA Financial Analyses-Selected Precedent
Transactions Analysis" is amended and supplemented by adding columns for the
announcement date, transaction value and LTM EBITDA to the list of selected
precedent transactions as follows:



                                                                         Transaction
Announcement                                                             Value (in         LTM
Date           Acquiror                     Target                       millions)         EBITDA
11/14/19       Ribbon Communications Inc.   ECI Telecom Ltd.             $         460       20.0x
6/24/19        Rudolph Technologies, Inc.   Nanometrics Incorporated     $         713       15.8x
11/9/18        II-VI Incorporated           Finisar Corporation          $       2,912       16.7x
11/8/18        CommScope Inc.               ARRIS International plc      $       7,145        8.0x
3/12/18        Lumentum Holdings Inc.       Oclaro, Inc.                 $       1,481        9.4x
               Cree, Inc.                   Infineon Technologies AG's
7/14/16                                     RF Power Assets              $         850        8.7x
2/22/17        ARRIS International plc      Ruckus Wireless, Inc.        $         877        9.7x
               Broadcom Limited             Brocade Communications
11/2/16                                     Systems Inc.                 $       5,936        9.6x
               Inphi Corp.                  ClariPhy Communications
11/1/16                                     Inc.                         $         275          NA
               Corning Incorporated         Alliance Fiber Optic
4/7/16                                      Products, Inc.               $         262       10.5x
               Coherent, Inc.               ROFIN-SINAR Technologies,
3/16/16                                     Inc.                         $         789       10.3x
2/23/16        MKS Instruments, Inc.        Newport Corporation          $         985       10.5x
               Microchip Technology         Atmel Corporation
1/13/16        Incorporated                                              $       3,282       15.1x
               Uphill Investment Co.        Integrated Silicon
6/23/15                                     Solution, Inc.               $         627       16.9x
               Lattice Semiconductor        Silicon Image, Inc.
1/27/15        Corporation                                               $         450       12.8x

The disclosure on page 115 of the Proxy Statement/Prospectus under the section "The Business Combination-Opinion of Financial Advisor to ADTRAN-Summary of Material Financial Analyses-ADVA Financial Analyses-Discounted Cash Flow Analysis" is amended and supplemented to read as follows:



Discounted Cash Flow Analysis. BofA Securities performed a discounted cash flow
analysis of ADVA to calculate the estimated present value of the standalone
unlevered, after-tax free cash flows Unlevered Free Cash Flows as described in
the section entitled "The Business Combination-Certain Unaudited Prospective
Financial Information" that ADVA was forecasted to generate during the third and
fourth quarters of calendar year 2021 and calendar years 2022 through 2026 based
on the ADVA forecasts. BofA Securities calculated terminal values for ADVA by
applying perpetuity growth rates of 2.0% to 3.0%, based on BofA Securities'
. . .

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