$ASPN

$5.39 +$0.21 (4.05%) Close

$ASPN Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 83.0M shares outstanding

Who owns ASPN?

By type of holder

Institutions 88.2% Insiders 2.1% Everyone else 9.7%

Concentration Top 10 holders own 49.9%

Kim, LLC 14.8% · BlackRock, Inc. 6.4%

Institutional ownership

88.2%

+4.8 pts vs last qtr

Institutional holders

177

+12 vs last qtr

Net shares bought

+3.9M

by institutions in Q2 2026

New / sold out

37 / 25

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

American Century Companies Inc +1.3M
Jacobs Levy Equity Management, Inc +839.3K

Biggest sellers in Q2 2026

Needham Investment Management LLC −1.3M
HRT Financial LP SOLD OUT −870.4K

Who is planning to sell?

Notices of proposed sale, last 12 months

$230K

2 notices from 2 people

Shares covered

62.4K

0.08% of the company

Arranged in advance

85%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Donald Young Director 10b5-1 $195K
Santhosh P Daniel Officer $35.3K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2012–FY2025

+2625170.5%

+209.76% a year

Each share's claim on the business

−100.0%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $32.4M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years48% 3–5 years20% 1–3 years17% Under 1 year15%

Quarterly turnover

13.0%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ASPN on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
K Kim, LLC	12.3M	14.80%	Unchanged	2022	7.8%
Shares held by quarter Peak holding12.3M (Q3'24) Change over 8 quarters0 Share of the company14.800% Kim, LLC's full portfolio →
B BlackRock, Inc.	5.3M	6.36%	+534.1K (+11.3%)	≤2021	0.0%
Shares held by quarter Peak holding5.3M (Q2'26) Change over 8 quarters+612.8K Share of the company6.360% BlackRock, Inc.'s full portfolio →

Kim, LLC

12.3M

% of company

14.80%

Change vs last qtr

Unchanged

Held since

2022

BlackRock, Inc.

5.3M

% of company

6.36%

Change vs last qtr

+534.1K (+11.3%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Aspen Aerogels, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ASPN on Form N-PORT; together they hold 28.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$16.8M	2.6M	3.18%	0.00%	June 30, 2026
NA Needham Aggressive Growth Fund Needham Funds Inc	$13.2M	2.1M	2.50%	0.50%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$16.8M

% of company

3.18%

% of the fund

0.00%

As of

June 30, 2026

Needham Aggressive Growth Fund

Needham Funds Inc

Position value

$13.2M

% of company

2.50%

% of the fund

0.50%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Aspen Aerogels, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
YD Young Donald R Insider	637.8K	0.77%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.770% Young Donald R's insider activity →
WC Whitaker Corby C Insider	205.3K	0.25%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.250% Whitaker Corby C's insider activity →

Young Donald R

Insider

637.8K

% of company

0.77%

Change vs last qtr

—

Held since

—

Whitaker Corby C

Insider

205.3K

% of company

0.25%

Change vs last qtr

—

Held since

—

13 more holders behind a free account

See every insider and 5%+ holder of Aspen Aerogels, Inc..

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