Every Form 4 that Aspen Aerogels, Inc. (ASPN) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow ASPN and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full ASPN filings page.
Aspen Aerogels Inc. (ASPN) reported that 1,143 of CAO, GC & Corp Secretary Glenn E. Deegan’s Common Stock shares were withheld on September 30, 2026, to satisfy minimum statutory tax withholding requirements on vesting of RSUs. His reported post-transaction position comprised 2,748 Common Stock shares and 63,285 RSUs.
Aspen Aerogels Inc. (ASPN) reported that Wood River Capital, LLC, identified as a former 10% owner, sold 12,280,426 common shares on September 23, 2026, at $4.73 per share in a single block trade. Wood River’s reported direct holdings after the sale were zero shares. A footnote says Koch Industries, Inc. and intermediate entities may be deemed beneficial owners of Wood River’s shares; Koch, Inc. is separately listed as a 10% owner. No Rule 10b5-1 plan is reported.
Aspen Aerogels director William P. Noglows reported an option exercise and updated his holdings. He exercised stock options covering 14,799 shares of Common Stock at an exercise price of $4.75 per share, converting them into directly held shares.
After the transaction, he directly holds 114,156 shares of Common Stock, which the footnotes state includes 103,786 shares and 10,370 Restricted Stock Units. The filing also notes 10,000 shares held indirectly in a trust for each of two children, where he serves as trustee.
Aspen Aerogels director Steven R. Mitchell received new equity awards as part of his non-employee director compensation. He was granted 10,370 Restricted Stock Units, each representing one share of common stock upon vesting. These RSUs vest on the earlier of May 13, 2027 or the day before the 2027 annual stockholders meeting.
Mitchell was also granted stock options for 8,706 shares of common stock at an exercise price of $5.40 per share, expiring on May 13, 2036. After these awards, he holds 156,898 common shares and RSUs in total, reflecting routine compensation-related acquisitions rather than open-market purchases.
Aspen Aerogels director James E. Sweetnam received new equity awards. He was granted 10,370 Restricted Stock Units as part of his annual compensation for service as a non-employee director. Each RSU converts into one share of common stock upon vesting in 2027.
He also received stock options for 8,706 shares of common stock at an exercise price of $5.40 per share, expiring on May 13, 2036. Following these awards, he holds 36,321 shares of common stock, including 10,370 RSUs.
Aspen Aerogels director William P. Noglows reported new equity awards and updated holdings. He received 10,370 Restricted Stock Units as part of his annual non-employee director grant, each RSU equal to one common share upon vesting. These RSUs vest on the earlier of May 13, 2027 or the day before the 2027 annual stockholder meeting. He was also granted stock options for 8,706 shares of common stock at an exercise price of $5.40 per share, expiring on May 13, 2036, with the same vesting schedule. After these grants, he directly holds 99,357 common-related units, consisting of 88,987 shares and 10,370 RSUs, and indirectly oversees 10,000 shares in each of two separate trusts for his children.
ASPEN AEROGELS INC director equity grant: Non-employee director Kathleen Kool received 10,370 Restricted Stock Units (RSUs) and options for 8,706 shares of Common Stock as part of her annual equity compensation. The RSUs and options will vest on the earlier of May 13, 2027 or the day before the company’s 2027 annual stockholders meeting. Following the RSU grant, she holds 34,323 shares of Common Stock in total, including 23,953 actual shares and 10,370 RSUs, and 8,706 stock options with a $5.40 exercise price expiring in 2036.
Aspen Aerogels director Cari Robinson reported equity awards for board service. On May 13, 2026, Robinson received 10,370 Restricted Stock Units (RSUs) and 8,706 stock options as part of the annual non-employee director equity grant.
Each RSU represents one share of common stock and will vest on the earlier of May 13, 2027, or the day before the company’s 2027 annual stockholders meeting. The options have a $5.40 exercise price, the same vesting schedule, and expire on May 13, 2036. Following these awards, Robinson’s reported position comprises 22,616 share equivalents, including 12,246 shares of common stock and 10,370 RSUs, held directly.
Aspen Aerogels Chief Commercial Officer Corby C. Whitaker reported a routine tax-related share disposition. On the vesting of Restricted Stock Units, 1,924 shares of Common Stock were withheld by the company at $3.22 per share to cover minimum statutory tax obligations.
After this withholding, Whitaker directly holds 205,315 shares of Common Stock, which the footnotes clarify represent 128,170 shares plus 77,145 RSUs. This event reflects compensation and tax mechanics rather than an open-market trade.
Aspen Aerogels CFO & Treasurer Grant Douglas Thoele reported a routine tax-withholding transaction. On this Form 4, 590 shares of common stock were withheld at $3.22 per share to cover minimum statutory taxes on the vesting of restricted stock units.
After this non-market disposition, Thoele is shown as holding 77,732 common-equivalent units, consisting of 10,111 shares of common stock and 67,621 RSUs. The event reflects compensation-related vesting mechanics rather than an open-market sale.
Aspen Aerogels President and CEO Donald R. Young reported a routine tax-related share disposition. On the vesting of Restricted Stock Units (RSUs), 4,275 shares of Common Stock were withheld by the company to cover minimum statutory tax obligations, at $3.22 per share.
After this withholding, Young holds 637,834 equity-based units, consisting of 438,349 shares of Common Stock and 199,485 RSUs. This event reflects compensation-related tax settlement rather than an open-market sale.
ASPEN AEROGELS INC Chief Operating Officer Gregg Landes reported a routine tax-related share disposition. The company withheld 1,924 shares of common stock at $3.22 per share to cover minimum statutory taxes on vesting of restricted stock units. After this withholding, Landes holds 102,931 equity-linked units, including 26,317 shares of common stock and 76,614 restricted stock units.
Aspen Aerogels President and CEO Donald R. Young reported equity compensation grants and related tax withholding transactions. On March 4, he acquired 156,716 shares of Common Stock and 212,249 stock options at a grant price of $0.00 per share through awards.
The restricted stock units vest in three equal installments on March 4, 2027, March 4, 2028, and March 4, 2029, and the options follow the same one-third annual vesting schedule. On March 5, 8,618 shares of Common Stock at $3.27 per share were withheld by the company to cover minimum statutory taxes on RSU vesting, leaving him with 642,109 directly held shares, including 430,387 shares of Common Stock and 211,722 RSUs.
Aspen Aerogels senior vice president Gregg Landes reported equity compensation awards and related tax withholding transactions. On March 4, 2026, he received 57,462 restricted stock units and 77,824 stock options that each vest in three equal annual installments on March 4, 2027, 2028 and 2029. On March 5, 3,814 shares of common stock at $3.27 per share were withheld to cover minimum statutory taxes on RSU vesting. After these movements, he directly holds 22,735 shares of common stock, 82,120 RSUs and 77,824 stock options.
DEEGAN GLENN E. reported acquisition or exercise transactions in this Form 4 filing.
Aspen Aerogels chief accounting officer and general counsel Glenn E. Deegan received new equity awards. On March 4, 2026, he was granted 75,171 stock options and 55,503 restricted stock units (RSUs) at no cash cost.
Each RSU represents one share of common stock when it vests. Both the RSUs and options vest in three equal installments on March 4, 2027, March 4, 2028 and March 4, 2029, aligning compensation with longer-term company performance.
Aspen Aerogels SVP Corby C. Whitaker reported equity compensation changes and related tax withholding. On March 4, 2026, he acquired 57,462 shares of Common Stock as a grant and 77,824 stock options, both at a stated price of $0.0000 per share.
The options vest in three equal annual installments on March 4, 2027, March 4, 2028, and March 4, 2029. Related RSUs follow the same vesting schedule. On March 5, 2026, 3,907 shares of Common Stock were disposed of at $3.27 per share to cover minimum statutory tax withholding on RSU vesting, leaving 207,239 Common shares held directly.
Aspen Aerogels Inc. Chief Accounting Officer P. Daniel Santhosh reported a small share disposal related to taxes rather than an open‑market sale. On the vesting of Restricted Stock Units (RSUs), 986 shares of common stock were withheld by the company at $3.27 per share to satisfy minimum statutory tax withholding requirements.
After this tax-withholding disposition, Santhosh’s holdings total 15,330 equity interests, consisting of 5,593 shares of common stock and 9,737 RSUs. This type of transaction is routine for executives when RSUs vest and does not reflect a discretionary buy or sell decision.
Aspen Aerogels CFO & Treasurer Grant Douglas Thoele reported new equity awards and a small tax-related share disposition. On March 4, 2026, he received 55,298 shares of Common Stock as a grant and 74,893 stock options with a right to buy additional shares at an exercise price of $0.0000 per share. The options and related Restricted Stock Units (RSUs) vest in three equal annual installments on March 4, 2027, March 4, 2028, and March 4, 2029. On March 5, 2026, 2,368 shares of Common Stock were disposed of at $3.27 per share to satisfy minimum statutory tax withholding on RSU vesting. After these transactions, he directly owned 78,322 shares of Common Stock, which the footnotes state includes 9,014 shares and 69,308 RSUs.
Aspen Aerogels filed an amended insider ownership report for its CFO and Treasurer following an equity grant. On October 1, 2025, the officer acquired 10,273 restricted stock units (RSUs) of common stock at a price of $0 per unit, reflecting a compensation award rather than an open-market purchase.
Each RSU represents one share of common stock and vests in three equal installments: one-third on March 5, 2026, one-third on March 5, 2027, and the final third on March 5, 2028. After correcting prior figures, the filing states the officer beneficially owns 25,392 share-based interests, consisting of 4,608 shares of common stock and 20,784 RSUs. The amendment explains that an earlier report had omitted 10,511 RSUs that were granted before the October 1, 2025 transaction date.
Aspen Aerogels (ASPN) reported an insider transaction by its President and CEO (also a Director). On 11/13/2025, the reporting person sold 56,845 shares of common stock (Transaction Code S) under a pre‑arranged Rule 10b5‑1 trading plan. The plan was adopted on August 11, 2025 to sell a limited number of shares for tax purposes related to a one-time personal real estate transaction.
The sale price reflected a weighted average of $3.23, with trades executed between $3.15 and $3.41. Following the transaction, the reporting person beneficially owns 494,011 equity units, comprising 414,306 shares of common stock and 79,705 restricted stock units. Ownership is reported as Direct (D). The filing includes Exhibit 24.1 (Power of Attorney) and was signed by Attorney‑in‑Fact Glenn Deegan on 11/14/2025.