Sec Form 3 Filing - Wood River Capital, LLC @ Eos Energy Enterprises, Inc. - 2022-05-02

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Wood River Capital, LLC 2. Issuer Name and Ticker or Trading Symbol Eos Energy Enterprises, Inc. [ EOSE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 4111 E. 37TH STREET NORTH 3. Date of Earliest Transaction (MM/DD/YY) 05/02/2022 (Street) WICHITA, KS67220 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 2,538,261 D( 1 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares 5% / 6% Convertible Senior PIK Toggle Notes Due 2021( 2 )( 3 ) $ 20 07/07/2021 06/20/2026 Common Stock 5,145,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Wood River Capital, LLC 4111 E. 37TH STREET NORTH WICHITA, KS67220 X Signatures Wood River Capital, LLC /s/ Raffaele G. Fazio 05/03/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Wood River Capital, LLC ("Wood River") is beneficially owned by SCC Holdings, LLC ("SCC"), SCC is beneficially owned by KIM, LLC ("KIM"), KIM is beneficially owned by Koch Investments Group, LLC ("KIG"), KIG is beneficially owned by Koch Investments Group Holdings, LLC ("KIGH"), and KIGH is beneficially owned by Koch Industries, Inc. ("Koch Industries"), in each case by means of ownership of all voting equity instruments. Koch Industries, SCC, KIM, KIG, and KIGH may be deemed to beneficially own the shares of common stock of Eos Energy Enterprises, Inc. (the "Issuer") held by Wood River by virtue of (i) Koch Industries' beneficial ownership of KIGH, (ii) KIGH's beneficial ownership of KIG, (iii) KIG's beneficial ownership of KIM, (iv) KIM's beneficial ownership of SCC and (v) SCC's beneficial ownership of Wood River. ( 2 )On July 6, 2021, Spring Creek Capital, LLC ("Spring Creek") entered into an investment agreement (the "Investment Agreement") with the Issuer relating to the issuance and sale of $100,000,000 in aggregate principal amount of the Issuer's 5%/6% Convertible Senior PIK Toggle Notes due 2026 (the "Notes"). The Notes were issued to Spring Creek on July 7, 2021. The Investment Agreement contemplated an ability to issue the Notes under an indenture to facilitate transferability. As permitted by the Investment Agreement, the Issuer reissued the Notes in an aggregate principal amount of $102,900,000, including $2,900,000 principal amount of the Notes representing interest previously paid in kind, pursuant to an indenture with Wilmington Trust, National Association, as trustee, dated as of April 7, 2022. On May 2, 2022, Spring Creek transferred the Notes and 2,538,261 Public Shares to Wood River. No consideration was paid by Wood River to Spring Creek in connection with these transfers. ( 3 )(Continued from Footnote 2), The Notes are convertible into shares of the Issuer's common stock at the holder's option at any time until the business day prior to the maturity date, based on an initial conversion rate of 49.9910 shares per $1,000 principal amount of the Notes, subject to customary anti-dilution and other adjustments.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.