X0306 4 2014-06-18 0 0001145986 ASPEN AEROGELS INC ASPN 0001418018 Prend David J C/O ROCKPORT CAPITAL PARTNERS 160 FEDERAL STREET, 18TH FLOOR BOSTON MA 02110 1 0 0 0 Common Stock 2014-06-18 4 C 0 380 A 439 I Held by Rockport Capital Partners, L.P. Common Stock 2014-06-18 4 C 0 62 A 501 I Held by Rockport Capital Partners, L.P. Common Stock 2014-06-18 4 C 0 3723 A 4224 I Held by Rockport Capital Partners, L.P. Common Stock 2014-06-18 4 A 0 127146 6.875 A 131370 I Held by Rockport Capital Partners, L.P. Common Stock 2014-06-18 4 A 0 22395 6.875 A 153765 I Held by Rockport Capital Partners, L.P. Common Stock 2014-06-18 4 C 0 545 A 906 I Held by Rockport Capital Partners II, L.P. Common Stock 2014-06-18 4 C 0 64 A 970 I Held by Rockport Capital Partners II, L.P. Common Stock 2014-06-18 4 C 0 148 A 1118 I Held by Rockport Capital Partners II, L.P. Common Stock 2014-06-18 4 C 0 2327 A 3445 I Held by Rockport Capital Partners II, L.P. Common Stock 2014-06-18 4 A 0 79466 6.875 A 82911 I Held by Rockport Capital Partners II, L.P. Common Stock 2014-06-18 4 A 0 83512 6.875 A 166423 I Held by Rockport Capital Partners II, L.P. Common Stock 2014-06-18 4 A 0 162992 6.875 A 329415 I Held by Rockport Capital Partners II, L.P. Common Stock 2014-06-18 4 A 0 63726 6.875 A 393141 I Held by Rockport Capital Partners II, L.P. Common Stock 63 I Held by Rockport SII, LLC Common Stock 42 I Held by RP Co-Investment Fund I, L.P. Common Stock 7727 D Series A Preferred Stock 2014-06-18 4 C 0 342700 D 2009-08-14 Common Stock 545 0 I Held by Rockport Capital Partners II, L.P. Series A Preferred Stock 2014-06-18 4 C 0 239890 D 2009-09-14 Common Stock 380 0 I Held by Rockport Capital Partners, L.P. Series A Preferred Stock 2014-06-18 4 C 0 40545 D 2009-09-14 Common Stock 64 0 I Held by Rockport Capital Partners II, L.P. Series B Preferred Stock 2014-06-18 4 C 0 34432 D 2010-09-22 Common Stock 62 0 I Held by Rockport Capital Partners, L.P. Series B Preferred Stock 2014-06-18 4 C 0 81284 D 2010-09-22 Common Stock 148 0 I Held by Rockport Capital Partners II, L.P. Warrant to Purchase Series C Preferred Stock (right to buy) 0.0001 2014-06-18 4 X 0 3093980 0.00 D 2013-05-06 2023-03-28 Series C Preferred Stock 3093980 0 I Held by Rockport Capital Partners, L.P. Series C Preferred Stock 2014-06-18 4 X 0 3093980 0.00 A 2014-06-18 Common Stock 3751 3093980 I Held by Rockport Capital Partners, L.P. Series C Preferred Stock 2014-06-18 4 F 0 23198 0.0133 D 2014-06-18 Common Stock 28 3070782 I Held by Rockport Capital Partners, L.P. Series C Preferred Stock 2014-06-18 4 C 0 3070782 D 2014-06-18 Common Stock 3723 0 I Held by Rockport Capital Partners, L.P. Warrant to Purchase Series C Preferred Stock (right to buy) 0.0001 2014-06-18 4 X 0 1933737 0.00 D 2013-05-06 2023-03-28 Series C Preferred Stock 1933737 0 I Held by Rockport Capital Partners II, L.P. Series C Preferred Stock 2014-06-18 4 X 0 1933737 0.00 A 2014-06-18 Common Stock 2345 1933737 I Held by Rockport Capital Partners II, L.P. Series C Preferred Stock 2014-06-18 4 F 0 14499 0.0133 D 2014-06-18 Common Stock 18 1919238 I Held by Rockport Capital Partners II, L.P. Series C Preferred Stock 2014-06-18 4 C 0 1919238 D 2014-06-18 Common Stock 2327 0 I Held by Rockport Capital Partners II, L.P. The Series A Preferred Stock automatically converted into Common Stock upon the closing of the Issuer's initial public offering pursuant to the Issuer's Restated Certificate of Incorporation, as amended, based on the conversion rate in effect at the time of conversion. The Series A Preferred Stock issued on September 14, 2009 converted to Common Stock on a 0.00158300-for-1 basis. Mr. Prend is a managing member of RockPort Capital I, LLC, RockPort Capital II, LLC, RockPort SGII, LLC and RP Co-Investment Fund I GP, LLC, which are the general partners, respectively, of RockPort Capital Partners, L.P., RockPort Capital Partners II, L.P., RockPort SII, LLC and RP Co-Investment Fund I, LP. Mr. Prend disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. The Series B Preferred Stock automatically converted into Common Stock upon the closing of the Issuer's initial public offering pursuant to the Issuer's Restated Certificate of Incorporation, as amended, based on the conversion rate in effect at the time of conversion. The Series B Preferred Stock issued on September 22, 2010 converted to Common Stock on a 0.00181579-for-1 basis. The Series C Preferred Stock automatically converted into Common Stock upon the closing of the Issuer's initial public offering pursuant to the Issuer's Restated Certificate of Incorporation, as amended, based on the conversion rate in effect at the time of conversion. The Series C Preferred Stock converted to Common Stock on a 0.00121250-for-1 basis. Upon the closing of the Issuer's initial public offering on June 18, 2014, the holder was issued shares of common stock upon the automatic conversion of the principal amount of $800,000 plus accrued and unpaid interest on the Senior Subordinated Convertible Note issued to the holder on May 6, 2013, which was automatically convertible at 62.5% of the Issuer's initial public offering price pursuant to the terms of the note. The Issuer's initial public offering price was $11.00 per share, so the conversion price was $6.875 per share. Upon the closing of the Issuer's initial public offering on June 18, 2014, the holder was issued shares of common stock upon the automatic conversion of the principal amount of $126,235 plus accrued and unpaid interest on the Subordinated Convertible Promissory Note issued to the holder on December 6, 2011, which was automatically convertible at 62.5% of the Issuer's initial public offering price pursuant to the terms of the note. The Issuer's initial public offering price was $11.00 per share, so the conversion price was $6.875 per share. The Series A Preferred Stock automatically converted into Common Stock upon the closing of the Issuer's initial public offering pursuant to the Issuer's Restated Certificate of Incorporation, as amended, based on the conversion rate in effect at the time of conversion. The Series A Preferred Stock issued on August 14, 2009 converted to Common Stock on a 0.00159191-for-1 basis. Upon the closing of the Issuer's initial public offering on June 18, 2014, the holder was issued shares of common stock upon the automatic conversion of the principal amount of $500,000 plus accrued and unpaid interest on the Senior Subordinated Convertible Note issued to the holder on May 6, 2013, which was automatically convertible at 62.5% of the Issuer's initial public offering price pursuant to the terms of the note. The Issuer's initial public offering price was $11.00 per share, so the conversion price was $6.875 per share. Upon the closing of the Issuer's initial public offering on June 18, 2014, the holder was issued shares of common stock upon the automatic conversion of the principal amount of $489,759 plus accrued and unpaid interest on the Subordinated Convertible Promissory Note issued to the holder on June 11, 2012, which was automatically convertible at 62.5% of the Issuer's initial public offering price pursuant to the terms of the note. The Issuer's initial public offering price was $11.00 per share, so the conversion price was $6.875 per share. Upon the closing of the Issuer's initial public offering on June 18, 2014, the holder was issued shares of common stock upon the automatic conversion of the principal amount of $978,118 plus accrued and unpaid interest on the Subordinated Convertible Promissory Note issued to the holder on September 26, 2012, which was automatically convertible at 62.5% of the Issuer's initial public offering price pursuant to the terms of the note. The Issuer's initial public offering price was $11.00 per share, so the conversion price was $6.875 per share. Upon the closing of the Issuer's initial public offering on June 18, 2014, the holder was issued shares of common stock upon the automatic conversion of the principal amount of $359,207 plus accrued and unpaid interest on the Subordinated Convertible Promissory Note issued to the holder on December 6, 2011, which was automatically convertible at 62.5% of the Issuer's initial public offering price pursuant to the terms of the note. The Issuer's initial public offering price was $11.00 per share, so the conversion price was $6.875 per share. Not applicable. Immediately prior to the consummation of the Issuer's initial public offering, the warrants to purchase Series C preferred stock were automatically exercised on a cashless basis for shares of Series C preferred stock, resulting in the Issuer's withholding of 23,198 shares of Series C preferred stock to pay the exercise price and issuing to the holder the remaining 3,070,782 shares of Series C preferred stock. The Issuer's withholding of Series C preferred stock was at a price per share of Series C preferred stock equivalent to the initial public offering price of $11.00 per share of common stock. Immediately prior to the consummation of the Issuer's initial public offering, the warrants to purchase Series C preferred stock were automatically exercised on a cashless basis for shares of Series C preferred stock, resulting in the Issuer's withholding of 14,499 shares of Series C preferred stock to pay the exercise price and issuing to the holder the remaining 1,919,238 shares of Series C preferred stock. The Issuer's withholding of Series C preferred stock was at a price per share of Series C preferred stock equivalent to the initial public offering price of $11.00 per share of common stock. 1 of 2 Form 4 filings by the reporting person /s/ John P. Condon, Attorney-in-fact 2014-06-20