NOGLOWS WILLIAM P 4

What Happened

• William P. Noglows, a non-employee director of Aspen Aerogels (ASPN), received awards on 2026-05-13: 10,370 restricted stock units (RSUs) and derivative awards/options covering 8,706 shares. Both awards are reported at $0.00 (grants/awards), i.e., no cash purchase. The RSUs represent the right to receive one share per unit upon vesting; the options represent the remaining portion of the annual director equity grant.

Key Details

• Transaction date: 2026-05-13 (Form 4 filed 2026-05-14; timely within the usual 2-business-day window).
• Award values/prices: both entries reported at $0.00 (grant/award code A).
• Vesting: RSUs will vest on the earlier of (a) May 13, 2027 or (b) the day prior to the 2027 annual meeting; the options have the same vesting schedule (per filing footnotes).
• Holdings after transaction: filing shows the reporting person holds 88,987 shares of common stock and 10,370 RSUs; options for 8,706 shares are also reflected in the filing.
• Other notes: some shares are held in trusts for the reporting person’s children (reporting person is trustee). Exhibit 24.1 (Power of Attorney) is included.

Context

• RSUs are deferred equity that convert to shares only upon vesting; options give the right to buy shares in the future if exercised. These awards are standard non-employee director compensation and do not represent an open-market purchase or sale. They are not immediate cash proceeds or sales and should be viewed as routine director equity grants unless followed by later sales or exercises.