ASPNNYSEWholesale-Lumber & Other Construction MaterialsFiscal year ends December 31
ASPEN AEROGELS INC
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 7, 2026
$5.32+0.13 (+2.50%)
Close on Oct 19, 2026
- Market cap
- $440.99M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
88.5%
73M of 83M shares
Institutional holders
180
38 new, 21 sold out
Net institutional buying
4M
In Q2 2026
Insider trades, 12 months
0 buys · 2 sales
Net sold $58.27M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Oaktop Capital Management II, L.P. | 4,394,525 | 5.35% | 13G (passive) amendment | Mar 31, 2025 |
| Needham Investment Management L.L.C. | 4,351,700 | 5.30% | 13G (passive) | Dec 31, 2025 |
| BlackRock, Inc. | 4,054,986 | 5.30% | 13G (passive) | Dec 31, 2023 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of ASPN | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Kim, LLC | 12,280,426 | 14.80% | $77.86M | – | 7.76% |
| BlackRock, Inc. | 5,277,148 | 6.36% | $33.46M | +534,072 | 0.00% |
| Oaktop Capital Management Ii, L.P. | 5,168,674 | 6.23% | $32.77M | – | 1.39% |
| Vanguard Capital Management LLC | 3,539,271 | 4.26% | $22.44M | +103,115 | 0.00% |
| Needham Investment Management LLC | 3,260,800 | 3.93% | $20.67M | −1,257,975 | 0.62% |
| George Kaiser Family Foundation | 3,167,322 | 3.82% | $20.08M | – | 1.93% |
| State Street Corp | 2,559,495 | 3.08% | $16.23M | +238,768 | 0.00% |
| American Century Companies Inc | 2,510,042 | 3.02% | $15.91M | +1,262,259 | 0.01% |
| Jacobs Levy Equity Management, Inc | 2,058,083 | 2.48% | $13.05M | +839,304 | 0.05% |
| Ameriprise Financial Inc | 1,821,295 | 2.19% | $11.55M | +314,916 | 0.00% |
| Geode Capital Management, LLC | 1,770,425 | 2.13% | $11.23M | +229,654 | 0.00% |
| Rice Hall James & Associates, LLC | 1,635,259 | 1.97% | $10.37M | +82,631 | 0.50% |
| Invesco Ltd. | 1,619,972 | 1.95% | $10.27M | −678,211 | 0.00% |
| Gagnon Securities LLC | 1,535,812 | 1.85% | $9.74M | −326,039 | 1.88% |
| Dimensional Fund Advisors LP | 1,447,333 | 1.74% | $9.17M | +190,853 | 0.00% |
| Goldman Sachs Group Inc | 1,372,300 | 1.65% | $8.70M | +472,787 | 0.00% |
| Royce & Associates LP | 1,323,218 | 1.59% | $8.39M | +336,705 | 0.07% |
| Aqr Capital Management LLC | 1,276,346 | 1.54% | $8.09M | +750,227 | 0.00% |
| Millennium Management LLC | 1,190,616 | 1.43% | $7.55M | −214,059 | 0.00% |
| Marshall Wace, Llp | 1,146,707 | 1.38% | $7.27M | −116,395 | 0.01% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 180 | 73M | 88.5% | 38 / 61 | 46 / 21 | 11M | 7M |
| Q1 2026 | 166 | 69M | 83.5% | 34 / 44 | 58 / 49 | 14M | 10M |
| Q4 2025 | 183 | 70M | 84.6% | 42 / 45 | 65 / 58 | 11M | 14M |
| Q3 2025 | 204 | 73M | 87.6% | 51 / 62 | 57 / 28 | 10M | 9M |
| Q2 2025 | 182 | 72M | 86.6% | 26 / 75 | 54 / 65 | 13M | 12M |
| Q1 2025 | 221 | 71M | 86.0% | 45 / 84 | 65 / 51 | 11M | 12M |
| Q4 2024 | 231 | 73M | 88.0% | 64 / 99 | 42 / 70 | 18M | 15M |
| Q3 2024 | 243 | 70M | 84.6% | 65 / 76 | 66 / 43 | 14M | 9M |
| Q2 2024 | 222 | 71M | 85.2% | 74 / 58 | 65 / 18 | 12M | 18M |
| Q1 2024 | 167 | 77M | 92.3% | 29 / 50 | 52 / 31 | 8M | 7M |
| Q4 2023 | 170 | 76M | 91.4% | 33 / 52 | 51 / 19 | 17M | 6M |
| Q3 2023 | 159 | 68M | 81.7% | 21 / 47 | 61 / 20 | 8M | 5M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of ASPN | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 2,642,312 | 3.18% | $16.75M | 0.00% | Jun 30, 2026 |
| Needham Aggressive Growth Fund | 2,075,000 | 2.50% | $13.16M | 0.50% | Jun 30, 2026 |
| iShares Russell 2000 ETF | 1,764,384 | 2.13% | $11.19M | 0.01% | Jun 30, 2026 |
| Avantis U.S. Small Cap Value ETF | 1,319,932 | 1.59% | $8.45M | 0.03% | May 31, 2026 |
| Invesco WilderHill Clean Energy ETF | 1,153,459 | 1.39% | $5.34M | 1.27% | Jul 31, 2026 |
| Columbia Small Cap Value Discovery Fund | 1,101,870 | 1.33% | $5.10M | 0.20% | Jul 31, 2026 |
| State Street(R) SPDR(R) S&P Kensho New Economies Composite ETF | 1,077,261 | 1.30% | $6.83M | 0.24% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 810,429 | 0.98% | $5.14M | 0.01% | Jun 30, 2026 |
| Fidelity Small Cap Index Fund | 740,120 | 0.89% | $3.43M | 0.01% | Jul 31, 2026 |
| iShares Russell 2000 Value ETF | 625,823 | 0.75% | $3.97M | 0.03% | Jun 30, 2026 |
| Royce Small-Cap Opportunity Fund | 624,319 | 0.75% | $3.96M | 0.28% | Jun 30, 2026 |
| Federated Hermes MDT Small Cap Core Fund | 603,353 | 0.73% | $2.79M | 0.12% | Jul 31, 2026 |
| Needham Small Cap Growth Fund | 600,000 | 0.72% | $3.80M | 0.91% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 362,884 | 0.44% | $2.32M | 0.01% | May 31, 2026 |
| Needham Growth Fund | 350,000 | 0.42% | $2.22M | 0.76% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Donald R. Young | President and CEO, Director | 637,834 | 0.77% | Mar 10, 2026 |
| Grant Douglas Thoele | CFO & Treasurer | 77,732 | 0.09% | Mar 10, 2026 |
| Corby C. Whitaker | Chief Commercial Officer | 205,315 | 0.25% | Mar 10, 2026 |
| Gregg Landes | Chief Operating Officer | 102,931 | 0.12% | Mar 10, 2026 |
| Glenn E. Deegan | CAO, GC & Corp Secretary | 67,176 | 0.08% | Mar 6, 2026 |
| Santhosh P. Daniel | Chief Accounting Officer | 15,330 | 0.02% | Mar 6, 2026 |
| Stephanie Pittman | Chief Human Resources Officer | 42,257 | 0.05% | Sep 8, 2025 |
| Virginia Johnson | CLO, GC, and Secretary | 44,450 | 0.05% | May 27, 2025 |
| Keith L. Schilling | SVP, Technology | 49,797 | 0.06% | Mar 11, 2025 |
| Ricardo C. Rodriguez | CFO & Treasurer | 57,311 | 0.07% | Mar 11, 2025 |
| William P. Noglows | Director | 134,156 | 0.16% | Jun 26, 2026 |
| Kathleen Kool | Director | 34,323 | 0.04% | May 14, 2026 |
| Cari Robinson | Director | 22,616 | 0.03% | May 14, 2026 |
| Steven R. Mitchell | Director | 156,898 | 0.19% | May 14, 2026 |
| James E. Sweetnam | Director | 36,321 | 0.04% | May 14, 2026 |
| Wood River Capital, LLC | – | 0 | – | Sep 24, 2026 |
| Koch, Inc. | 10% owner | 12,280,426 | 14.80% | Sep 24, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Wood River Capital, LLC – | Sep 23, 2026 | Sale | −12,280,426 | $4.73 | $58.09M | 0 |
| William P. Noglows Director | Jun 23, 2026 | Option exercise | +14,799 | $4.75 | $70.30K | 114,156 |
| William P. Noglows Director | May 13, 2026 | Award | +10,370 | – | – | 99,357 |
| Kathleen Kool Director | May 13, 2026 | Award | +10,370 | – | – | 34,323 |
| Cari Robinson Director | May 13, 2026 | Award | +10,370 | – | – | 22,616 |
| Steven R. Mitchell Director | May 13, 2026 | Award | +10,370 | – | – | 156,898 |
| James E. Sweetnam Director | May 13, 2026 | Award | +10,370 | – | – | 36,321 |
| Corby C. Whitaker Chief Commercial Officer | Mar 8, 2026 | Tax withholding | −1,924 | $3.22 | $6.20K | 205,315 |
| Gregg Landes Chief Operating Officer | Mar 8, 2026 | Tax withholding | −1,924 | $3.22 | $6.20K | 102,931 |
| Donald R. Young President and CEO, Director | Mar 8, 2026 | Tax withholding | −4,275 | $3.22 | $13.77K | 637,834 |
| Grant Douglas Thoele CFO & Treasurer | Mar 8, 2026 | Tax withholding | −590 | $3.22 | $1.90K | 77,732 |
| Donald R. Young President and CEO, Director | Mar 5, 2026 | Tax withholding | −8,618 | $3.27 | $28.18K | 642,109 |
| Gregg Landes SVP, Operations and Strat Deve | Mar 5, 2026 | Tax withholding | −3,814 | $3.27 | $12.47K | 104,855 |
| Grant Douglas Thoele CFO & Treasurer | Mar 5, 2026 | Tax withholding | −2,368 | $3.27 | $7.74K | 78,322 |
| Corby C. Whitaker SVP, Sales and Marketing | Mar 5, 2026 | Tax withholding | −3,907 | $3.27 | $12.78K | 207,239 |
| Santhosh P. Daniel Chief Accounting Officer | Mar 5, 2026 | Tax withholding | −986 | $3.27 | $3.22K | 15,330 |
| Donald R. Young President and CEO, Director | Mar 4, 2026 | Award | +156,716 | – | – | 650,727 |
| Glenn E. Deegan CAO, GC & Corp Secretary | Mar 4, 2026 | Award | +55,503 | – | – | 67,176 |
| Gregg Landes SVP, Operations and Strat Deve | Mar 4, 2026 | Award | +57,462 | – | – | 108,669 |
| Grant Douglas Thoele CFO & Treasurer | Mar 4, 2026 | Award | +55,298 | – | – | 80,690 |
| Corby C. Whitaker SVP, Sales and Marketing | Mar 4, 2026 | Award | +57,462 | – | – | 211,146 |
| Donald R. Young President and CEO, Director | Nov 13, 2025 | Sale(10b5-1 plan) | −56,845 | $3.23 | $183.61K | 494,011 |
| Grant Douglas Thoele CFO & Treasurer | Oct 1, 2025 | Award | +10,273 | – | – | 25,392 |
| Grant Douglas Thoele CFO & Treasurer | Oct 1, 2025 | Award | +10,273 | – | – | 14,881 |
| Glenn E. Deegan CAO, GC & Corp Secretary | Sep 30, 2025 | Award | +11,673 | – | – | 11,673 |
| Santhosh P. Daniel Chief Accounting Officer | Sep 13, 2025 | Tax withholding | −1,563 | $6.59 | $10.30K | 16,316 |
| Stephanie Pittman Chief Human Resources Officer | Sep 5, 2025 | Tax withholding | −1,581 | $6.61 | $10.45K | 42,257 |
| Santhosh P. Daniel Chief Accounting Officer | Aug 13, 2025 | Sale | −2,000 | $7.54 | $15.08K | 17,879 |
| Santhosh P. Daniel Chief Accounting Officer | Aug 12, 2025 | Sale | −4,410 | $7.31 | $32.24K | 19,879 |
| Virginia Johnson CLO, GC, and Secretary | May 23, 2025 | Tax withholding | −6,129 | $6.39 | $39.16K | 44,450 |
| Donald R. Young President and CEO, Director | May 12, 2025 | Buy | +20,000 | $5.35 | $107.00K | 550,856 |
| Cari Robinson Director | Apr 30, 2025 | Award | +10,370 | – | – | 12,246 |
| William P. Noglows Director | Apr 30, 2025 | Award | +10,370 | – | – | 88,987 |
| James E. Sweetnam Director | Apr 30, 2025 | Award | +10,370 | – | – | 25,951 |
| Kathleen Kool Director | Apr 30, 2025 | Award | +10,370 | – | – | 23,953 |
| Steven R. Mitchell Director | Apr 30, 2025 | Award | +10,370 | – | – | 146,528 |
| Keith L. Schilling SVP, Technology | Mar 7, 2025 | Tax withholding | −1,924 | $7.95 | $15.30K | 49,797 |
| Gregg Landes SVP, Operations and Strat Deve | Mar 7, 2025 | Tax withholding | −1,924 | $7.95 | $15.30K | 51,207 |
| Donald R. Young President and CEO, Director | Mar 7, 2025 | Tax withholding | −3,569 | $7.95 | $28.37K | 530,856 |
| Corby C. Whitaker SVP, Sales and Marketing | Mar 7, 2025 | Tax withholding | −1,924 | $7.95 | $15.30K | 153,684 |
| Ricardo C. Rodriguez CFO & Treasurer | Mar 7, 2025 | Tax withholding | −1,924 | $7.95 | $15.30K | 57,311 |
| Virginia Johnson CLO, GC, and Secretary | Mar 7, 2025 | Tax withholding | −1,924 | $7.95 | $15.30K | 50,579 |
| Virginia Johnson CLO, GC, Secretary & CCO | Mar 5, 2025 | Award | +26,307 | – | – | 52,503 |
| Virginia Johnson CLO, GC, Secretary & CCO | Mar 5, 2025 | Tax withholding | −936 | $7.84 | $7.34K | 26,196 |
| Keith L. Schilling SVP, Technology | Mar 5, 2025 | Tax withholding | −936 | $7.84 | $7.34K | 27,008 |
| Keith L. Schilling SVP, Technology | Mar 5, 2025 | Award | +24,713 | – | – | 51,721 |
| Ricardo C. Rodriguez CFO & Treasurer | Mar 5, 2025 | Tax withholding | −936 | $7.84 | $7.34K | 19,376 |
| Ricardo C. Rodriguez CFO & Treasurer | Mar 5, 2025 | Award | +39,859 | – | – | 59,235 |
| Gregg Landes SVP, Operations and Strat Deve | Mar 5, 2025 | Award | +24,713 | – | – | 53,131 |
| Gregg Landes SVP, Operations and Strat Deve | Mar 5, 2025 | Tax withholding | −936 | $7.84 | $7.34K | 28,418 |
| Corby C. Whitaker SVP, Sales and Marketing | Mar 5, 2025 | Award | +25,510 | – | – | 155,608 |
| Corby C. Whitaker SVP, Sales and Marketing | Mar 5, 2025 | Tax withholding | −936 | $7.84 | $7.34K | 130,098 |
| Donald R. Young President and CEO, Director | Mar 5, 2025 | Award | +54,209 | – | – | 534,425 |
| Donald R. Young President and CEO, Director | Mar 5, 2025 | Tax withholding | −2,316 | $7.84 | $18.16K | 480,216 |
| Stephanie Pittman Chief Human Resources Officer | Mar 5, 2025 | Award | +22,321 | – | – | 43,838 |
| Stephanie Pittman Chief Human Resources Officer | Mar 5, 2025 | Tax withholding | −936 | $7.84 | $7.34K | 21,517 |
| Santhosh P. Daniel Chief Accounting Officer | Mar 5, 2025 | Award | +4,783 | – | – | 24,289 |
| Santhosh P. Daniel Chief Accounting Officer | Mar 5, 2025 | Tax withholding | −428 | $7.84 | $3.36K | 19,506 |
| Ricardo C. Rodriguez CFO & Treasurer | Feb 25, 2025 | Tax withholding | −173 | $7.46 | $1.29K | 20,312 |
| Corby C. Whitaker SVP, Sales and Marketing | Feb 21, 2025 | Tax withholding | −499 | $8.04 | $4.01K | 131,034 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| P. Daniel Santhosh Officer | Aug 10, 2026 | 5,593 | $35.29K | Aug 10, 2026 | Restricted Stock |
| Young Donald Director, Officer | Nov 13, 2025 | 56,845 | $194.98K | Nov 13, 2025 | Previously Exercised Stock Options |
| P. Daniel Santhosh Officer | Aug 12, 2025 | 4,410 | $32.25K | Aug 12, 2025 | Restricted Stock |
| R. Young Donald President, CEO, Director | Sep 30, 2024 | 134,629 | $3.72M | Sep 30, 2024 | Open Market Purchase |
| Rodriguez Ricardo Officer | Aug 26, 2024 | 32,465 | $978.50K | Aug 26, 2024 | Restricted Stock Units |
| Young Donald Director, Officer | May 28, 2024 | 691,124 | $20.51M | May 28, 2024 | Exercise of Stock Options |
| Kool Kathleen Director | May 22, 2024 | 4,470 | $120.11K | May 22, 2024 | Stock Option Exercise |
| Schilling Keith Officer | May 13, 2024 | 20,000 | $536.86K | May 13, 2024 | Stock Option Exercise |
| Whitaker Corby Officer | May 6, 2024 | 55,159 | $1.38M | May 6, 2024 | Stock Option Exercise |