AMTM Amentum Holdings, Inc.

NYSE
$20.06

Amentum Holdings, Inc. (AMTM) 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
+36.00
17 buyers / 8 sellers
STRONG BUYING
Funds compared
26
funds with comparable AMTM positions
23 current holders · 23 prior-quarter holders
Net share change
+2.39M
+4.98M added, -2.58M cut
Position activity
3 new 14 increased 5 reduced 3 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
Maverick Capital Long/Short Growth Sold Out -46.3K -100.0% $957.7K 0.0% 57
CITADEL ADVISORS LLC Quant Increased +590.0K +731.7% $12.2M 0.0% 56
MILLENNIUM MANAGEMENT LLC Increased +1.50M +237.2% $30.9M 0.0% 55
Bridgewater Associates Quant Macro Increased +30.2K +176.9% $623.6K 0.0% 55
ExodusPoint Capital Management Long/Short Quant New +226.3K — $4.7M 0.0% 54
D. E. Shaw & Co., Inc. Quant Increased +125.3K +189.4% $2.6M 0.0% 54
Aristeia Capital Event Long/Short Sold Out -20.6K -100.0% $425.9K 0.0% 54
Balyasny Asset Management L.P. Increased +67.0K +365.5% $1.4M 0.0% 53
Qube Research & Technologies Ltd Quant Increased +957.0K +1237.0% $19.8M 0.0% 53
Jain Global Long/Short Quant New +27.5K — $568.8K 0.0% 52

Most significant buyers

By move score, not size.

  • CITADEL ADVISORS LLC Increased · +590.0K
  • MILLENNIUM MANAGEMENT LLC Increased · +1.50M
  • Bridgewater Associates Increased · +30.2K
  • ExodusPoint Capital Management New · +226.3K
  • D. E. Shaw & Co., Inc. Increased · +125.3K

Most significant sellers

By move score, not size.

  • Maverick Capital Sold Out · -46.3K
  • Aristeia Capital Sold Out · -20.6K
  • Lighthouse Investment Partners Sold Out · -12.1K
  • Point72 Asset Management, L.P. Reduced · -980.6K
  • TWO SIGMA INVESTMENTS, LP Reduced · -615.9K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Maverick Capital 2 0 46.3K -46.3K -100.0% 0.0% Sold Out 57
CITADEL ADVISORS LLC 1 670.7K 80.6K +590.0K +731.7% 0.0% Increased 56
MILLENNIUM MANAGEMENT LLC 2 2.1M 631.1K +1.50M +237.2% 0.0% Increased 55
Bridgewater Associates 1 47.2K 17.1K +30.2K +176.9% 0.0% Increased 55
ExodusPoint Capital Management 3 226.3K 0 +226.3K — 0.0% New 54
D. E. Shaw & Co., Inc. 1 191.5K 66.2K +125.3K +189.4% 0.0% Increased 54
Aristeia Capital 2 0 20.6K -20.6K -100.0% 0.0% Sold Out 54
Balyasny Asset Management L.P. 2 85.4K 18.3K +67.0K +365.5% 0.0% Increased 53
Qube Research & Technologies Ltd 2 1.0M 77.4K +957.0K +1237.0% 0.0% Increased 53
Jain Global 3 27.5K 0 +27.5K — 0.0% New 52
Lighthouse Investment Partners 3 0 12.1K -12.1K -100.0% 0.0% Sold Out 51
Cinctive Capital Management 3 10.0K 0 +10.0K — 0.0% New 50
Point72 Asset Management, L.P. 1 650.0K 1.6M -980.6K -60.1% 0.0% Reduced 48
TWO SIGMA INVESTMENTS, LP 2 284.3K 900.2K -615.9K -68.4% 0.0% Reduced 47
CenterBook Partners 4 328.8K 143.7K +185.1K +128.8% 0.3% Increased 46
Brevan Howard Capital Management 3 167.4K 77.2K +90.2K +116.8% 0.1% Increased 46
Boothbay Fund Management 4 388.0K 86.2K +301.8K +350.1% 0.2% Increased 45
Moore Capital Management 3 365.1K 873.6K -508.5K -58.2% 0.2% Reduced 45
Walleye Capital 3 13.8K 3.8K +10.0K +261.5% 0.0% Increased 45
Caption Management 3 64.0K 21.7K +42.3K +194.6% 0.0% Increased 44
Gotham Asset Management, LLC 2 156.1K 521.0K -364.9K -70.0% 0.0% Reduced 43
Verition Fund Management 2 2.0M 1.3M +721.4K +55.6% 0.4% Increased 42
Holocene Advisors, LP 2 89.0K 123.2K -34.2K -27.7% 0.0% Reduced 32
AQR Capital Management 3 601.9K 507.8K +94.1K +18.5% 0.0% Increased 26
Winton Group 4 58.4K 55.5K +2.9K +5.2% 0.0% Increased 19
Wolverine Asset Management 2 51.9K 51.9K 0 +0.0% 0.1% Unchanged 18

Every fund above opens. Subscribers can see any manager's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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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.