Stock ownership · SEC 13F · Q4 2025

ASPEN AEROGELS INC

Who owns ASPEN AEROGELS INC (CUSIP 04523Y105)? A look at the institutions behind it, how tightly they hold it, and the latest quarter's moves.

$183K
Reported value
2
Institutions
100%
Top-5 share

The verdict

As of Q4 2025, 2 institutions report $183K in ASPEN AEROGELS INC positions, ownership that is dominated by its top few institutional owners.

2
institutions hold it
$183K
reported 13F value
100%
held by top 5

Based on long positions reported to the SEC as of Q4 2025; 13F omits shorts, options and non-US holdings.

How 13F ownership is computed · All tracked stocks · Concentration rankings

SEC Form 13F-HR ownership desk

CUSIP 04523Y105 · Q4 2025 $0M reported

VALUE-TRACE · HOLDERS-FOCUS · CONC-DOM · PHOTO-UNK · ACTIVITY-LIGHT · BOOK-MID

  • VALUE-TRACE $0.2M
  • HOLDERS-FOCUS 2 filers
  • CONC-DOM 100% top-5
  • PHOTO-UNK No peer
  • ACTIVITY-LIGHT 2 new
  • BOOK-MID 7Q history

Read with: Ownership concentration guide - ASPEN AEROGELS INC's top-five holders account for 100% of reported value — read concentration before treating any single filer as a signal.

Institutional ownership over time

The number of institutions reporting a ASPEN AEROGELS INC position has risen from 1 to 2 over the last 7 quarters of 13F filings.

0.511.522.533.5 Q1'24Q3'24Q4'24Q1'25Q2'25Q3'25Q4'25 2
Distinct 13F filers holding ASPEN AEROGELS INC, by quarter

Top Institutional Holders

# Institution Shares Value Share of reported
1 Aristides Capital LLC 62,400 $177K 96.7%
2 Strategic Investment Solutions, Inc. /IL 2,160 $6K 3.3%

Investment Discretion

SEC Form 13F requires each institutional filer to report whether it exercises sole or shared discretion over a position. Among ASPEN AEROGELS INC's reported holders for Q4 2025, by reported value:

Sole discretion (SOLE)
100.0%

Latest Quarter Activity · Q4 2025

New positions (2)

Aristides Capital LLC $177K
Strategic Investment Solutions, Inc. /IL $6K

Complete exits (3)

Penn Capital Management Company, LLC exited
CONNORS INVESTOR SERVICES INC exited
JPMORGAN CHASE & CO (JPM, AMJB, VYLD, JPM-PC, JPM-PD, JPM-PJ, JPM-PK, JPM-PL, JPM-PM) exited

Frequently Asked Questions

How many institutions hold ASPEN AEROGELS INC?▼
ASPEN AEROGELS INC is held by 2 institutional investors per the latest SEC Form 13F filings as of Q4 2025.
What is the total institutional value of ASPEN AEROGELS INC?▼
Institutions report $183K of ASPEN AEROGELS INC as of Q4 2025.
How concentrated is ownership of ASPEN AEROGELS INC?▼
The top five institutional holders account for 100% of the reported institutional value in ASPEN AEROGELS INC, making ownership dominated by its top few institutional owners.
Who is the largest institutional holder of ASPEN AEROGELS INC?▼
Aristides Capital LLC is the largest reported holder of ASPEN AEROGELS INC with $177K across 62,400 shares as of Q4 2025.

Source: U.S. Securities and Exchange Commission (SEC) - EDGAR Form 13F-HR institutional holdings filings · Q4 2025 13F-HR discloses long US-listed equity positions of managers with $100M+ qualifying assets, filed within 45 days of period end. Short positions and most derivatives are not disclosed.

PlainFundData is rendered directly from SEC EDGAR Form 13F-HR institutional holdings filings, no number is typed in by an editor. Holder lists, concentration, and reported value on this page are aggregated live from those 13F-HR extracts. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-05-16.