SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* SPRING CREEK CAPITAL LLC (Last) (First) (Middle) 4111 E. 37TH STREET NORTH (Street) WICHITA KS 67220 (City) (State) (Zip)	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)
	3. Date of Earliest Transaction (Month/Day/Year) 02/18/2022
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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								3,462,124(1)	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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	$34.9366	02/18/2022		P		100,000,000(3)		02/18/2022	02/18/2027	Common Stock	2,862,325(4)	$100,000,000	$100,000,000	I(5)	See Footnote(6)

1. Name and Address of Reporting Person* SPRING CREEK CAPITAL LLC (Last) (First) (Middle) 4111 E. 37TH STREET NORTH (Street) WICHITA KS 67220 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* KOCH INDUSTRIES INC (Last) (First) (Middle) 4111 E. 37TH STREET NORTH (Street) WICHITA KS 67220 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Represents 3,462,124 shares of common stock ("Public Shares") of Aspen Aerogels, Inc. (the "Issuer") held by Spring Creek Capital, LLC ("Spring Creek").

2. Spring Creek 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 Public Shares held by Spring Creek 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 Spring Creek.

3. On February 15, 2022, Wood River Capital, LLC ("Wood River") entered into a note purchase agreement with the Issuer relating to the issuance and sale of $100,000,000 in aggregate principal amount of the Issuer's Convertible Senior PIK Toggle Notes due 2027 (the "Notes"). The Notes were issued to Wood River on February 18, 2022 and are convertible into shares of the Issuer's common stock at Wood River's option at any time until the business day prior to the maturity date, based on an initial conversion rate of 28.623257 shares per $1,000 principal amount of the Notes, subject to customary anti-dilution and other adjustments.

4. Represents 2,862,325 shares of common stock ("Convertible Shares") of the Issuer issuable to Wood River upon conversion of the Notes.

5. Wood River is beneficially owned by SCC, SCC is beneficially owned by KIM, KIM is beneficially owned by KIG, KIG is beneficially owned by KIGH, and KIGH is beneficially owned by 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 Convertible Shares 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. Spring Creek is not a beneficial owner of the Convertible Shares.

6. Koch Industries may be deemed to beneficially own 6,324,449 shares of common stock of the Issuer consisting of (i) 3,462,124 Public Shares held by Spring Creek; and (ii) 2,862,325 Convertible Shares beneficially owned through Wood River's Notes holdings. These Issuer securities may be deemed to be beneficially owned by Koch Industries by virtue of its indirect beneficial ownership of each of Spring Creek and Wood River.

Remarks:

	Spring Creek Capital, LLC /s/ Raffaele G. Fazio, Secretary	02/23/2022
	Koch Industries, Inc. /s/ Raffaele G. Fazio, Assistant Secretary	02/23/2022
	** Signature of Reporting Person	Date
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