Sec Form 4 Filing - Wood River Capital, LLC @ ASPEN AEROGELS INC - 2022-11-28

FORM 4 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

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1. Name and Address of Reporting Person Wood River Capital, LLC 2. Issuer Name and Ticker or Trading Symbol ASPEN AEROGELS INC [ ASPN] 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) 11/28/2022 (Street) WICHITA, KS67220 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 11/30/2022 P( 1 ) 10,526,316 A $ 9.5 15,780,426 D( 2 )

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 Convertible Senior PIK Toggle Notes due 2027 $ 29.9366( 3 ) 11/28/2022 J( 3 ) 0 11/28/2022( 3 ) 02/18/2027 Common Stock 491,735( 3 ) ( 3 ) $ 102,940,667 D( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Wood River Capital, LLC 4111 E. 37TH STREET NORTH WICHITA, KS67220 X KOCH INDUSTRIES INC 4111 E. 37TH STREET NORTH WICHITA, KS67220 X Signatures Wood River Capital, LLC /s/ Raffaele G. Fazio, Vice President and Secretary 12/06/2022 Signature of Reporting Person Date Koch Industries, Inc. /s/ Raffaele G. Fazio, Assistant Secretary 12/06/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On November 30, 2022, Aspen Aerogels, Inc. (the "Issuer") announced the pricing of an underwritten public offering of the Issuer's common stock, par value $0.00001 per share ("Public Shares"), at a price to the public of $9.50 per Public Share (the "Offering"). Wood River Capital, LLC ("Wood River") participated in the Offering by purchasing 10,526,316 Public Shares from the underwriters. ( 2 )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 the Issuer's common stock beneficially owned 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. ( 3 )On November 28, 2022, the Issuer and Wood River entered into Amendment No. 1 to Convertible Senior PIK Toggle Note Due 2027 ("Amendment No. 1") to the Convertible Senior PIK Toggle Note Due 2027, dated February 18, 2022 (as amended by Amendment No. 1, the "Convertible Notes"), whereby the initial conversion price was reduced by $5.00 from $34.936625 per Public Share to $29.936625 per Public Share by increasing the initial conversion rate from 28.623257 Public Shares per $1,000 principal amount of the Convertible Notes to 33.400100 Public Shares per $1,000 principal amount of the Convertible Notes. Wood River was not issued additional principal amount of the Convertible Notes in connection with Amendment No. 1, and the transaction in Table II is reported solely to reflect the change in conversion price on the Convertible Notes as a result of such amendment.

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).

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