ASPN Aspen Aerogels, Inc.

NYSE
$4.93

Aspen Aerogels, Inc. (ASPN) Hedge Fund Activity

This view isolates hedge funds from the broader institutional ownership shown on the Institutional tab. A pension fund tracking an index may have no view on a stock; when a hedge fund builds or exits a position, that decision can carry information. This page measures those changes. Positions as of June 30, 2026.

Based on quarterly 13F long-equity filings. Changes compare reported quarter-end positions; filings can be reported up to 45 days later and do not represent a fund's complete exposure.

Hedge fund breadth
+9.09
12 buyers / 10 sellers
MIXED
Funds compared
22
funds with comparable ASPN positions
20 current holders · 16 prior-quarter holders
Net share change
+1.25M
+2.54M added, -1.29M cut
Position activity
6 new 6 increased 8 reduced 2 exited

Most significant moves

Ranked by conviction, not size — how much of the fund's own book the position represents, how far it moved, and what kind of fund made it.

Fund Action Shares changed Change Est. value Portfolio wt. Score
RENAISSANCE TECHNOLOGIES LLC Quant New +274.4K — $1.7M 0.0% 60
Point72 Asset Management, L.P. Reduced -247.6K -96.5% $1.6M 0.0% 55
Trexquant Investment Quant New +302.4K — $1.9M 0.0% 53
Quadrature Capital Quant New +19.2K — $121.5K 0.0% 52
Tudor Investment Corporation Macro Increased +416.3K +275.5% $2.6M 0.0% 50
Brevan Howard Capital Management Macro Sold Out -11.6K -100.0% $73.7K 0.0% 49
Winton Group Quant Macro New +61.2K — $388.0K 0.0% 48
Centiva Capital Long/Short Quant New +56.5K — $358.0K 0.0% 48
Y-Intercept Quant New +36.8K — $233.4K 0.0% 48
Engineers Gate Quant Sold Out -148.2K -100.0% $939.3K 0.0% 48

Most significant buyers

By move score, not size.

  • RENAISSANCE TECHNOLOGIES LLC New · +274.4K
  • Trexquant Investment New · +302.4K
  • Quadrature Capital New · +19.2K
  • Tudor Investment Corporation Increased · +416.3K
  • Winton Group New · +61.2K

Most significant sellers

By move score, not size.

  • Point72 Asset Management, L.P. Reduced · -247.6K
  • Brevan Howard Capital Management Sold Out · -11.6K
  • Engineers Gate Sold Out · -148.2K
  • Balyasny Asset Management L.P. Reduced · -105.7K
  • CITADEL ADVISORS LLC Reduced · -342.5K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
RENAISSANCE TECHNOLOGIES LLC 1 274.4K 0 +274.4K — 0.0% New 60
Point72 Asset Management, L.P. 1 9.0K 256.6K -247.6K -96.5% 0.0% Reduced 55
Trexquant Investment 3 302.4K 0 +302.4K — 0.0% New 53
Quadrature Capital 3 19.2K 0 +19.2K — 0.0% New 52
Tudor Investment Corporation 2 567.4K 151.1K +416.3K +275.5% 0.0% Increased 50
Brevan Howard Capital Management 3 0 11.6K -11.6K -100.0% 0.0% Sold Out 49
Winton Group 4 61.2K 0 +61.2K — 0.0% New 48
Centiva Capital 4 56.5K 0 +56.5K — 0.0% New 48
Y-Intercept 4 36.8K 0 +36.8K — 0.0% New 48
Engineers Gate 4 0 148.2K -148.2K -100.0% 0.0% Sold Out 48
TWO SIGMA INVESTMENTS, LP 2 779.5K 441.4K +338.0K +76.6% 0.0% Increased 47
AQR Capital Management 3 1.3M 526.1K +750.2K +142.6% 0.0% Increased 47
Balyasny Asset Management L.P. 2 43.7K 149.4K -105.7K -70.7% 0.0% Reduced 44
CITADEL ADVISORS LLC 1 238.7K 581.2K -342.5K -58.9% 0.0% Reduced 43
Aquatic Capital Management 4 16.4K 3.1K +13.3K +429.6% 0.0% Increased 42
Squarepoint Ops LLC 2 16.5K 59.8K -43.3K -72.5% 0.0% Reduced 42
Quantbot Technologies 4 45.4K 4.5K +40.9K +904.5% 0.0% Increased 39
D. E. Shaw & Co., Inc. 1 1.1M 833.6K +232.9K +27.9% 0.0% Increased 36
MILLENNIUM MANAGEMENT LLC 2 1.2M 1.4M -214.1K -15.2% 0.0% Reduced 32
Man Group 3 90.3K 143.3K -53.1K -37.0% 0.0% Reduced 30
MARSHALL WACE, LLP 2 1.1M 1.3M -116.4K -9.2% 0.0% Reduced 27
Graham Capital Management 3 46.3K 52.4K -6.2K -11.7% 0.0% Reduced 21

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Hedge funds are identified from their 13F filings, which are due 45 days after quarter end and cover long U.S.-listed equity positions only. A fund's short book never appears, so a reduced position can mean a changed view or a changed hedge — the filing doesn't say which.