Item 8.01. Other Events.

Supplemental Disclosures to the Proxy Statement/Prospectus

As previously announced, on July 6, 2020, Vivint Solar, Inc., a Delaware corporation ("Vivint Solar"), entered into an Agreement and Plan of Merger (the "merger agreement") with Sunrun Inc., a Delaware corporation ("Sunrun") and Viking Merger Sub, Inc., a Delaware corporation and direct wholly owned subsidiary of Sunrun ("Merger Sub"), pursuant to which Merger Sub will merge with and into Vivint Solar, with Vivint Solar continuing as the surviving corporation (the "merger").

This Current Report on Form 8-K (this "Form 8-K") is being filed to update and supplement the joint proxy statement/prospectus (the "joint proxy statement/prospectus") (1) included in the Registration Statement on Amendment No. 1 to Form S-4, File No. 333-246371 (the "Registration Statement"), filed by Sunrun with the Securities and Exchange Commission (the "SEC") on August 14, 2020 and declared effective by the SEC on September 2, 2020, (2) filed by Sunrun with the SEC as a prospectus on September 2, 2020, (3) filed by Vivint Solar with the SEC as a definitive proxy statement on Schedule 14A on September 2, 2020, and (4) mailed by Vivint Solar to its stockholders commencing on September 2, 2020. The information contained in this Form 8-K is incorporated by reference into the proxy statement/prospectus. Terms used in this Form 8-K, but not otherwise defined, shall have the meanings ascribed to such terms in the proxy statement/prospectus.

Following the announcement of the merger agreement and as of the date of this Form 8-K, twelve lawsuits have been filed by alleged stockholders of Vivint Solar and Sunrun challenging the merger.

Sunrun, Vivint Solar and the other named defendants deny that they have violated any laws or breached any duties to Sunrun's or Vivint Solar's stockholders and believe that these lawsuits are without merit and that no supplemental disclosure is required to the joint proxy statement/prospectus under any applicable law, rule or regulation. However, solely to eliminate the burden and expense of litigation and to avoid any possible disruption to the merger that could result from further litigation, Sunrun and Vivint Solar are providing the supplemental disclosures set forth in this Form 8-K. The supplemental information contained in this Form 8-K should be read in conjunction with the joint proxy statement/prospectus, which we urge you to read in its entirety. Nothing in this Form 8-K shall be deemed an admission of the legal necessity or materiality under applicable laws of any of the disclosures set forth herein. To the extent that information in this Form 8-K differs from, or updates information contained in, the proxy statement/prospectus, the information in this Form 8-K shall supersede or supplement the information in the proxy statement/prospectus. The information contained in this supplement speaks only as of September 22, 2020, unless the information specifically indicates that another date applies. Except as otherwise described in this Form 8-K or the documents referred to, contained in or incorporated by reference in this Form 8-K, the proxy statement/prospectus, the annexes to the proxy statement/prospectus and the documents referred to, contained in or incorporated by reference in the proxy statement/prospectus are not otherwise modified, supplemented or amended.

If you have not already submitted a proxy for use at the Vivint Solar virtual special meeting, you are urged to do so promptly. This Form 8-K does not affect the validity of any proxy card or voting instructions that Vivint Solar stockholders may have previously received or delivered. No action is required by any Vivint Solar stockholder who has previously delivered a proxy or voting instructions and who does not wish to revoke or change that proxy or voting instructions.

Supplemental Disclosures

All page references are to pages in the joint proxy statement/prospectus, and terms used below, unless otherwise defined, have the meanings set forth in the joint proxy statement/prospectus.





    1.   The following disclosure replaces the fourth full paragraph on page 22 of
         the joint proxy statement/prospectus. The modified text is underlined
         below:

Additional complaints were filed on August 24, 25, 26, 27, and 31, and on September 4, 9, 11, and 18, 2020 in the United States District Court for the District of Delaware, the Eastern District of New York, the Southern District of New York, and the Northern District of California. Two of the complaints name as defendants each of the members of the Vivint Solar board and Vivint Solar (collectively, the "Vivint Solar Defendants") and Sunrun and Merger Sub, while the four complaints filed in the Eastern and Southern Districts of New York, one of the complaints filed in the District of Delaware, and two of the complaints filed in the Northern District of California name only the Vivint Solar Defendants. One of the complaints filed in the Northern District of California names only Sunrun and the Sunrun board as defendants. All assert violations of Section 14(a) and 20(a) of the Exchange Act and Rule 14a-9, alleging that the Registration Statement on Form S-4 omitted or misrepresented material information regarding the merger. The complaints filed between August 24, 27, and September 4, 9, 11 and 18 all additionally assert a violation of Section 20(a) of the Exchange Act.





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2. The following disclosure replaces the third paragraph on page 74 of the

joint proxy statement/prospectus. The modified text is underlined below:

During the second half of 2019, members of Vivint Solar's management and the Vivint Solar Board conferred with Morgan Stanley and BofA Securities and discussed the possibility of commencing a process to explore a potential strategic transaction. Vivint Solar ultimately selected Morgan Stanley to act as its lead financial advisor and BofA Securities to act as an additional financial advisor in connection with a potential strategic transaction. Vivint Solar determined to engage two financial advisors, among other things, in light of the potential complexity of a possible strategic transaction and the number of prospective counterparties anticipated to be contacted in such process. Vivint Solar selected each of Morgan Stanley and BofA Securities based on its respective experience in transactions similar to the potential strategic transaction, qualifications, expertise and reputation and its knowledge of Vivint Solar and its business and the industries in which Vivint Solar conducts its business. During this time, members of Vivint Solar management, with the assistance of Vivint Solar's advisors, prepared a "confidential information presentation" and assembled materials for an online data room in anticipation of a potential strategic transaction. Representatives of 313 Acquisition also participated in this process.





    3.   The following disclosure replaces the last paragraph on page 74
         (continuing to the top of page 75) of the joint proxy
         statement/prospectus. The modified text is underlined below:

Beginning in early January 2020, at the direction of members of the Vivint Solar Board, representatives of Morgan Stanley and BofA Securities, on behalf of Vivint Solar, began to contact prospective counterparties in connection with a potential strategic transaction. During the course of the strategic transaction outreach process, 24 prospective bidders were contacted, including 8 strategic parties and 16 financial parties. Of the 24 prospective bidders, 15 executed confidentiality agreements, including (1) Sunrun, (2) Party C, (3) Party D, (4) a private equity firm ("Party G") and (5) a strategic party ("Party H"). The 15 confidentiality agreements generally restricted the counterparties from disclosing or using Vivint Solar confidential information furnished to them by or on behalf of Vivint Solar for any reason other than in connection with a potential strategic transaction with Vivint Solar. None of the 15 confidentiality agreements with the potential bidders restricted them from making unsolicited proposals to Vivint Solar or contained other standstill restrictions. In addition, except for the confidentiality agreement with Party C, none of the 15 confidentiality agreements with the potential bidders restricted them from soliciting for employment and/or hiring Vivint Solar employees. The confidentiality agreement with Party C contained a provision prohibiting Party C from soliciting members of senior management of Vivint Solar of whom Party C first became aware or with whom Party C first had contact as a result of Party C's evaluation of a potential strategic transaction to terminate their employment with Vivint Solar, subject to certain customary exceptions. While Party F was contacted in the course of the strategic transaction process, Party F declined to sign a confidentiality agreement and did not participate in further conversations with Vivint Solar with respect to a potential strategic transaction. Party A, Party B and Party E were not contacted in the course of the strategic transaction process because a potential combination with Party A was not expected to be attractive to the Vivint Solar Board or Vivint Solar's stockholders, Party B had previously indicated that it was interested in pursuing commercial opportunities with Vivint Solar rather than a potential strategic transaction and Party E had previously proposed an unattractive valuation for Vivint Solar and was not expected to propose a valuation that would be attractive to the Vivint Solar Board.





    4.   The following disclosure replaces the first paragraph on page 80 of the
         joint proxy statement/prospectus. The modified text is underlined below:

In April 2020, Sunrun management prepared certain financial forecasts in connection with the potential transaction process, which were shared with the Sunrun Board. Certain of these forecasts were shared with Vivint Solar and Credit Suisse in connection with the potential transaction process. For more information, including a description of the items used to calculate various line items in the Sunrun Management Projections, see the section entitled "-Certain Sunrun Unaudited Prospective Financial Information" beginning on page 126, and the footnotes on pages 129 to 131 of this joint proxy statement/prospectus.





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5. The following disclosure replaces the second paragraph on page 87 of the

joint proxy statement/prospectus. The modified text is underlined below:

On July 6, 2020, the Sunrun Board held a virtual board meeting, which was attended by Sunrun senior management. At the request of Sunrun senior management, representatives of Cooley and Axinn, Veltrop & Harkrider LLP ("Axinn"), outside counsel with respect to antitrust matters to Sunrun, and Credit Suisse, financial advisor to Sunrun, also attended the meeting. Ms. Jurich provided an update on discussions with Vivint Solar, including that Sunrun and Vivint Solar had agreed to an exchange ratio of 0.55. Ms. Steele then provided the Sunrun Board with a further update on the status of diligence, and Ms. Jurich provided an update regarding the discussions that she had with Mr. Bywater with respect to the pre-signing employment agreements with Mr. Bywater and Mr. Allred. Representatives of Cooley discussed the directors' fiduciary duties in connection with the Sunrun Board's evaluation of the potential strategic transaction with Vivint Solar. Representatives of Credit Suisse reviewed Credit Suisse's financial analyses with respect to the transaction and rendered Credit Suisse's oral opinion, confirmed by delivery of a written opinion, to the Sunrun Board to the effect that, as of such date and subject to the procedures followed, assumptions made, qualifications and limitations on the review undertaken and other matters considered by Credit Suisse as described in such written opinion, the exchange ratio was fair, from a financial point of view, to Sunrun. The full text of the written opinion of Credit Suisse is attached to this joint proxy statement/prospectus as Annex B and is incorporated by reference in this joint proxy statement/prospectus in its entirety. See also the section entitled "-Opinion of Sunrun's Financial Advisor" beginning on page 98 of this joint proxy statement/prospectus. For more information regarding the individual companies analyzed in Credit Suisse's Selected Public Companies Analyses, see pages 101-102 in the section entitled "-Opinion of Sunrun's Financial Advisor." Representatives of Cooley and Axinn then provided an updated summary of the proposed terms of the merger agreement and the employment agreements that were anticipated to be entered into in connection with the transaction and described the resolutions the directors would be asked to consider if they were to approve the transaction. At the conclusion of the meeting, after careful review and discussion by the Sunrun Board, including consideration of the factors described below under the section entitled "Sunrun Board's Recommendation and Reasons for the Merger," the Sunrun Board (i) approved and declared advisable, fair to and in the best interests of Sunrun and its stockholders, the merger agreement, the merger and all other transactions, ancillary agreements, documents and other instruments identified in and contemplated by the merger agreement; and (ii) directed that the Sunrun share issuance proposal and the Sunrun adjournment proposal be submitted to the Sunrun stockholders for approval.





    6.   The following disclosure replaces the first sentence of the last
         paragraph on page 101 of the joint proxy statement/prospectus. The
         modified text is underlined below:

Credit Suisse considered certain financial data for Sunrun and Vivint Solar, as well as Sunnova Energy International Inc., a company with publicly traded equity securities Credit Suisse deemed similar to Sunrun and Vivint Solar in one or more respects, including their respective industries, operations, and size.





    7.   The following disclosure replaces the fifth full paragraph on page 108 of
         the joint proxy statement/prospectus. The modified text is underlined
         below:

Morgan Stanley performed a trading comparables analysis, which is intended to provide an implied value of a company by comparing it to similar companies that are publicly traded. Morgan Stanley reviewed and compared publicly available financial information for Vivint Solar with comparable publicly available financial information for Sunrun and Sunnova Energy International Inc. ("Sunnova"). Morgan Stanley reviewed certain financial information of Sunnova, a public company that shares similar business characteristics to Vivint Solar based upon Sunnova's public filings, investor presentations and research analyst reports. Morgan Stanley utilized in its analyses described below (i) a net debt amount for Vivint Solar of $1.6 billion as of March 31, 2020 as publicly reported by Vivint Solar and (ii) the number of outstanding shares of Vivint Solar common stock on a fully diluted basis applying the treasury stock method using shares, options, and restricted stock units and performance-based restricted stock units projected by Vivint Solar's management to be outstanding as of July 2, 2020, which projections included (A) 125.4 million shares outstanding of common stock, (B) 5.1 million stock options at a weighted average exercise price of $5.23, and (C) an aggregate of 6.0 million restricted stock units and performance-based restricted stock units. The fully diluted shares outstanding calculation excludes any dilutive effects from Vivint Solar LTIP Awards under the Vivint Solar LTIP Plans, as defined performance targets thereunder were not assumed to be satisfied at the valuation date.





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    8.   The following disclosure replaces the second and third paragraphs on page
         110 of the joint proxy statement/prospectus. The modified text is
         underlined below:

Morgan Stanley performed a pre-tax levered discounted cash flow analysis, which is intended to provide an implied value of a company by calculating the present value of the estimated future free cash flows and terminal value of such company.

Morgan Stanley first calculated the equity value of Vivint Solar's systems installed as of December 31, 2019, referred to herein as "Vivint Solar AssetCo", which value was calculated as the estimated levered free cash flows that management of Vivint Solar forecasted Vivint Solar to generate during calendar years 2020 through 2050 from such systems, plus current unrestricted excess cash from the Vivint Solar holding company loan facility financing announced on June 2, 2020. Such cash flows were then discounted to present value as of June 30, 2020 using discount rates ranging from 9.3% to 11.3%, which discount rates were selected, upon the application of Morgan Stanley's professional judgment and experience, to reflect a cost of equity for Vivint Solar (based on the capital asset pricing model). As inputs to the capital asset pricing model, Morgan Stanley took into account, among other things, risk free rate, levered beta, historical equity risk premium and, upon the application of Morgan Stanley's professional judgment and experience, a +/- 1.0% sensitivity adjustment around the calculated value.

Morgan Stanley then calculated the equity value of Vivint Solar's new systems forecasted to be installed from January 1, 2020 through 2024, referred to herein as "Vivint Solar DevCo", which value was calculated as the estimated present value of the levered cash flows that management of Vivint Solar forecasted Vivint Solar to generate during calendar years 2020 through 2024 from such systems, plus a terminal equity value based on a one-year forward EBITDA multiple.





    9.   The following disclosure replaces the third paragraph on page 111 of the
         joint proxy statement/prospectus. The modified text is underlined below:

For reference only and not as a component of its fairness analysis, Morgan Stanley reviewed future public market trading price targets for Vivint Solar common stock prepared and published by equity research analysts as of July 2, 2020 (the second to last full trading day prior to the meeting of the Vivint Solar Board to declare the advisability of the merger agreement and the transactions contemplated thereby, including the merger, and to approve the merger agreement and the consummation of the transactions contemplated thereby). These forward targets, as summarized below, reflected each analyst's estimate of the future public market trading price of Vivint Solar common stock and were discounted to reflect present values using Vivint Solar's cost of equity of 10.3%, which represented the mid-point of the aforementioned 9.3% to 11.3% discount rates range, which was selected, upon the application of Morgan Stanley's professional judgment and experience, to reflect a cost of equity calculation for Vivint Solar (based on the capital asset pricing model). As inputs to the capital asset pricing model, Morgan Stanley took into account, among other things, risk free rate, levered beta, historical equity risk premium and, upon the application of Morgan Stanley's professional judgment and experience, a +/- 1.0% sensitivity adjustment around the calculated value. Morgan Stanley compared the high and low price targets for Vivint Solar, each rounded to the nearest $0.25, to construct the price target range shown for reference.

Vivint Solar Equity Analysts Price Targets



            Analyst
        (Date of Report)             Target Price
BofA Securities
(June 3, 2020)                      $        12.50

Roth Capital Partners
(June 20, 2020)                     $        15.00

Oppenheimer
(May 8, 2020)                       $        11.00

JMP Securities
(June 5, 2020)                      $        15.00

KeyBanc
(May 13, 2020)                      $        12.00

Citigroup
(February 4, 2020)                  $        11.00

Goldman Sachs
(June 24, 2020)                     $        10.00





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10. The following disclosure replaces the first paragraph on page 112 of the

joint proxy statement/prospectus. The modified text is underlined below:

Morgan Stanley performed a trading comparables analysis, which is intended to provide an implied value of a company by comparing it to similar companies that are publicly traded. Morgan Stanley reviewed and compared publicly available financial information for Sunrun with comparable publicly available financial information for Vivint Solar and Sunnova. Morgan Stanley utilized in its analyses described below (i) a net debt amount for Sunrun of $3.2 billion as of March 31, 2020 as publicly reported by Sunrun and (ii) the number of outstanding shares of Sunrun common stock on a fully diluted basis applying the treasury stock method using shares, options, and restricted stock units projected by Sunrun's management to be outstanding as of July 2, 2020, which projections included (A) 122.4 million shares outstanding of common stock, (B) 10.5 million stock options at a weighted average exercise price of $8.02, and (C) 4.5 million restricted stock units.





    11.  The following disclosure replaces the last paragraph on page 112 of the
         joint proxy statement/prospectus and the first and second paragraphs on
         page 113 of the joint proxy statement/prospectus. The modified text is
         underlined below:

Morgan Stanley performed a pre-tax levered discounted cash flow analysis, which is intended to provide an implied value of a company by calculating the present value of the estimated future free cash flows and terminal value of such company.

Morgan Stanley first calculated the equity value of Sunrun's systems installed as of December 31, 2019, referred to herein as "Sunrun AssetCo", which value was calculated as the estimated levered free cash flows that Sunrun is forecasted to generate during calendar years 2020 through 2050 from such systems. Financial data used in this analysis was based on the forecast prepared by Sunrun's management and assumptions from Vivint Solar's management. Such cash flows were then discounted to present value as of June 30, 2020 using discount rates ranging from 9.4% to 11.4%, which discount rates were selected, upon the application of Morgan Stanley's professional judgment and experience, to reflect a cost of equity calculation for Sunrun (based on the capital asset pricing model). As inputs to the capital asset pricing model, Morgan Stanley took into account, among other things, risk free rate, levered beta, historical equity risk premium and, upon the application of Morgan Stanley's professional judgment and experience, a +/- 1.0% sensitivity adjustment around the calculated value.

Morgan Stanley then calculated the equity value of Sunrun's new systems forecasted to be installed from January 1, 2020 through 2024, referred to herein as "Sunrun DevCo", which value was calculated as the estimated present value of the levered cash flows that Sunrun is forecasted to generate during calendar years 2020 through 2024 from such systems, plus a terminal equity value based on a one-year forward EBITDA multiple. Financial data used in this analysis was based on the forecast prepared by Sunrun's management and assumptions from Vivint Solar's management for calendar years 2020 through 2024.

Morgan Stanley then estimated the terminal values of Sunrun DevCo at the end of the forecast period by using an EBITDA trading multiple ranging from 12.0x to 16.0x applied to Sunrun DevCo's EBITDA in 2025 based on the forecast prepared by Sunrun's management and assumptions provided by Vivint Solar's management, less the Sunrun DevCo debt in the terminal year based on the forecast prepared by Sunrun's management and assumptions from Vivint Solar's management, resulting in a terminal equity value range of $566 million to $1.5 billion. The terminal value one-year forward EBITDA trading multiple range was selected based upon the application of Morgan Stanley's professional judgment and experience and the two-year average one-year forward EBITDA trading multiple for Ameresco, Inc., Enphase Energy, Inc. and SolarEdge Technologies, Inc., which companies were selected because they are publicly traded companies similar to Sunrun DevCo. Such cash flows and terminal values were then discounted to present value as of June 30, 2020 using discount rates ranging from 9.4% to 11.4%, which discount rates were selected, upon the application of Morgan Stanley's professional judgment and experience, to reflect a cost of equity calculation for Sunrun (based on the capital asset pricing model).





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12. The following disclosure replaces the first paragraph on page 114 of the

joint proxy statement/prospectus. The modified text is underlined below:

For reference only and not as a component of its fairness analysis, Morgan Stanley reviewed future public market trading price targets for Sunrun common stock prepared and published by equity research analysts as of July 2, 2020 (the second to last full trading day prior to the meeting of the Vivint Solar Board to declare the advisability of the merger agreement and the transactions contemplated thereby, including the merger, and to approve the merger agreement and the consummation of the transactions contemplated thereby). These forward targets, as summarized below, reflected each analyst's estimate of the future public market trading price of Sunrun common stock and were discounted to reflect present values using Sunrun's cost of equity of 10.4%, which represented the mid-point of the aforementioned 9.4% to 11.4% discount rates range, which was selected, upon the application of Morgan Stanley's professional judgment and experience, to reflect a cost of equity calculation for Sunrun (based on the capital asset pricing model). As inputs to the capital asset pricing model, Morgan Stanley took into account, among other things, risk free rate, levered beta, historical equity risk premium and, upon the application of Morgan Stanley's professional judgment and experience, a +/- 1.0% sensitivity adjustment around the calculated value. Morgan Stanley compared the high and low price targets for Sunrun, each rounded to the nearest $0.25, to construct the price target range shown for reference.

Sunrun Equity Analysts Price Targets



Analyst (Date of Report)        Target Price
Roth Capital Partners
(June 20, 2020)                 $       30.00

JMP Securities
(May 7, 2020)                   $       19.00

Oppenheimer
(May 7, 2020)                   $       23.00

Barclays
(May 18, 2020)                  $       23.00

Credit Suisse
(June 15, 2020)                 $       29.00

Morgan Stanley
(June 19, 2020)                 $       15.00

BofA Securities
(May 20, 2020)                  $       19.50

Goldman Sachs
(June 24, 2020)                 $       23.00

J.P. Morgan
(June 22, 2020)                 $       24.00

UBS
(May 6, 2020)                   $       11.00





    13.  The following disclosure replaces the fourth paragraph on page 114 of the
         joint proxy statement/prospectus. The modified text is underlined below:


Morgan Stanley performed a trading comparables analysis, which is intended to provide an implied value of a company by comparing it to similar companies that are publicly traded. Morgan Stanley reviewed and compared publicly available financial information for the pro forma combined company with comparable publicly available financial information for Vivint Solar, Sunrun and Sunnova. Morgan Stanley utilized in its analyses described below (i) the combined net debt amount for each of Vivint Solar and Sunrun as of March 31, 2020 as publicly reported by Vivint Solar and Sunrun, respectively, and (ii) the number of outstanding shares of Sunrun common stock on a fully diluted basis applying the treasury stock method using shares, options, and restricted stock units projected by Sunrun's management to be outstanding as of July 2, 2020, which projections included (A) 122.4 million shares outstanding of common stock, (B) 10.5 million stock options at a weighted average exercise price of $8.02, (C) an aggregate of 4.5 million restricted stock units and performance-based restricted stock units, and (D) 75.1 million new shares of common stock issued to stockholders of Vivint Solar in connection with the merger. The dilutive impact of Vivint Solar LTIP Awards under the Vivint Solar LTIP Plans on the pro forma . . .

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