X0206 3 2014-06-12 0 0001145986 ASPEN AEROGELS INC ASPN 0001610257 Young Donald R C/O ASPEN AEROGELS, INC. 30 FORBES ROAD, BUILDING B NORTHBOROUGH MA 01532 1 1 0 0 President and CEO Series A Preferred Stock 2009-09-10 Common Stock 2 D Series B Preferred Stock 2010-10-20 Common Stock 0 D Warrants to Purchase Series C Preferred Stock 2013-05-06 2023-03-28 Common Stock 6 D Stock Option (right to buy) 74.23 2023-08-07 Common Stock 6779 D Stock Option (right to buy) 74.23 2023-08-07 Common Stock 726 I Held by Mr. Young's children Stock Option (right to buy) 1814.43 2019-11-11 Common Stock 18 I Held by Mr. Young's children Stock Option (right to buy) 1814.43 2019-11-11 Common Stock 48 I Held by Young Family Trust Not applicable. The shares of preferred stock will convert into common stock upon the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the conversion rate in effect at the time of conversion. These shares of Series A Preferred Stock issued on September 10, 2009 will convert on a 0.00158415-for-1 basis, assuming the Issuer effects a 1-for-824.7412544 reverse split of its common stock prior to the closing of its initial public offering, and such conversion rate is reflected in the amount of common stock underlying the security. The shares of preferred stock will convert into common stock upon the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the conversion rate in effect at the time of conversion. These shares of Series B Preferred Stock issued on October 20, 2010 will convert on a 0.00179737-for-1 basis, assuming the Issuer effects a 1-for-824.7412544 reverse split of its common stock prior to the closing of its initial public offering, and such conversion rate is reflected in the amount of common stock underlying the security. This warrant will be automatically net exercised for shares of Series C Preferred Stock and such shares of Series C Preferred Stock will convert into common stock upon the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the conversion rate in effect at the time of conversion. The shares of Series C Preferred Stock will convert on a 0.00121250-for-1 basis, assuming the Issuer effects a 1-for-824.7412544 reverse split of its common stock prior to the closing of its initial public offering, and such conversion rate is reflected in the amount of common stock underlying the security. This option vested as to 40% of the shares on August 7, 2013 and vests as to 1.667% of the shares per month thereafter until August 7, 2016. The number of shares underlying this option and the exercise price of this option assume a 1-for-824.7412544 reverse stock split in connection with the Issuer's initial public offering. All shares underlying this option have vested. Exhibit 24.1 - Power of Attorney /s/ John P. Condon, Attorney-in-fact 2014-06-12