DEEGAN GLENN E. 4

What Happened
Glenn E. Deegan, Chief Administrative Officer, General Counsel & Corporate Secretary of Aspen Aerogels (ASPN), was granted two awards on March 4, 2026: 55,503 shares reported as an award/acquisition and 75,171 derivative units, both at $0.00 (no cash paid). The filings show a total of 130,674 units granted.

Key Details

• Transaction date: March 4, 2026; Form 4 filed March 6, 2026 (timely).
• Reported grant amounts: 55,503 shares @ $0.00 (award) and 75,171 derivative units @ $0.00. Total = 130,674 units.
• Vesting: Footnotes state RSUs vest one-third on March 4, 2027, one-third on March 4, 2028, and the remainder on March 4, 2029 (F1). A footnote also notes 67,176 RSUs (F2) and the derivative/options vest on the same one‑third annual schedule (F3).
• Shares owned after the transaction: Not specified in this filing.
• Considerations: No cash changed hands (awards granted at $0.00). Exhibit 24.1 (Power of Attorney) is included.

Context
These are time‑based equity awards (RSUs and derivative awards/options) that vest over three years; they are not immediate sales or open‑market purchases and therefore represent future potential equity rather than an immediate change in share ownership. Such grants are routine compensation for executives and do not by themselves indicate a buy or sell signal.