CENX Century Aluminum Company

NASDAQ
$39.80

Century Aluminum Company (CENX) 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
-17.39
19 buyers / 27 sellers
SELLING
Funds compared
47
funds with comparable CENX positions
38 current holders · 41 prior-quarter holders
Net share change
-2.50M
+2.71M added, -5.20M cut
Position activity
6 new 13 increased 18 reduced 9 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
Weiss Asset Management Event Quant New +269.9K — $12.4M 0.2% 59
TWO SIGMA INVESTMENTS, LP Quant New +27.6K — $1.3M 0.0% 59
Woodline Partners LP Long/Short New +626.8K — $28.8M 0.1% 58
Tudor Investment Corporation Macro Sold Out -279.2K -100.0% $12.8M 0.0% 58
MARSHALL WACE, LLP Long/Short Sold Out -11.8K -100.0% $540.8K 0.0% 56
Encompass Capital Advisors Long/Short Reduced -651.4K -42.0% $30.0M 1.8% 56
Balyasny Asset Management L.P. Increased +664.5K +699.0% $30.6M 0.1% 56
Portolan Capital Management Long/Short Sold Out -95.0K -100.0% $4.4M 0.0% 55
Moore Capital Management Macro Sold Out -82.8K -100.0% $3.8M 0.0% 55
Quadrature Capital Quant Sold Out -54.6K -100.0% $2.5M 0.0% 55

Most significant buyers

By move score, not size.

  • Weiss Asset Management New · +269.9K
  • TWO SIGMA INVESTMENTS, LP New · +27.6K
  • Woodline Partners LP New · +626.8K
  • Balyasny Asset Management L.P. Increased · +664.5K
  • Man Group New · +60.5K

Most significant sellers

By move score, not size.

  • Tudor Investment Corporation Sold Out · -279.2K
  • MARSHALL WACE, LLP Sold Out · -11.8K
  • Encompass Capital Advisors Reduced · -651.4K
  • Portolan Capital Management Sold Out · -95.0K
  • Moore Capital Management Sold Out · -82.8K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Weiss Asset Management 2 269.9K 0 +269.9K — 0.2% New 59
TWO SIGMA INVESTMENTS, LP 2 27.6K 0 +27.6K — 0.0% New 59
Woodline Partners LP 2 626.8K 0 +626.8K — 0.1% New 58
Tudor Investment Corporation 2 0 279.2K -279.2K -100.0% 0.0% Sold Out 58
MARSHALL WACE, LLP 2 0 11.8K -11.8K -100.0% 0.0% Sold Out 56
Encompass Capital Advisors 3 900.0K 1.6M -651.4K -42.0% 1.8% Reduced 56
Balyasny Asset Management L.P. 2 759.6K 95.1K +664.5K +699.0% 0.1% Increased 56
Portolan Capital Management 3 0 95.0K -95.0K -100.0% 0.0% Sold Out 55
Moore Capital Management 3 0 82.8K -82.8K -100.0% 0.0% Sold Out 55
Quadrature Capital 3 0 54.6K -54.6K -100.0% 0.0% Sold Out 55
Magnetar Capital 2 0 7.4K -7.4K -100.0% 0.0% Sold Out 54
Man Group 3 60.5K 0 +60.5K — 0.0% New 54
Trexquant Investment 3 0 44.3K -44.3K -100.0% 0.0% Sold Out 53
ExodusPoint Capital Management 3 0 14.6K -14.6K -100.0% 0.0% Sold Out 52
CenterBook Partners 4 28.4K 0 +28.4K — 0.1% New 51
CITADEL ADVISORS LLC 1 290.0K 1.3M -1.03M -78.0% 0.0% Reduced 51
Parallax Volatility Advisers 3 10.0K 0 +10.0K — 0.0% New 50
Hudson Bay Capital Management 3 100.0K 7.5K +92.5K +1238.5% 0.0% Increased 49
Lighthouse Investment Partners 3 79.3K 23.4K +55.9K +238.8% 0.1% Increased 47
Cinctive Capital Management 3 107.2K 48.2K +59.0K +122.6% 0.2% Increased 47
Quantbot Technologies 4 0 14.4K -14.4K -100.0% 0.0% Sold Out 45
Point72 Asset Management, L.P. 1 294.6K 569.5K -274.9K -48.3% 0.0% Reduced 45
Caxton Associates 3 17.7K 88.7K -71.0K -80.0% 0.0% Reduced 44
Squarepoint Ops LLC 2 679.2K 410.1K +269.1K +65.6% 0.1% Increased 44
Bridgewater Associates 1 473.9K 732.5K -258.6K -35.3% 0.1% Reduced 44
Aristeia Capital 2 17.1K 9.3K +7.7K +82.6% 0.0% Increased 43
Engineers Gate 4 45.7K 297.5K -251.8K -84.6% 0.0% Reduced 43
D. E. Shaw & Co., Inc. 1 795.7K 1.4M -637.6K -44.5% 0.0% Reduced 42
MILLENNIUM MANAGEMENT LLC 2 1.1M 2.0M -871.4K -43.8% 0.0% Reduced 42
Schonfeld Strategic Advisors 3 6.2K 28.9K -22.7K -78.4% 0.0% Reduced 42
Merewether Investment Management 2 693.5K 514.8K +178.7K +34.7% 0.6% Increased 40
Qube Research & Technologies Ltd 2 847.5K 589.9K +257.5K +43.7% 0.0% Increased 39
Voloridge Investment Management 2 393.0K 720.7K -327.7K -45.5% 0.1% Reduced 39
RENAISSANCE TECHNOLOGIES LLC 1 94.3K 139.5K -45.2K -32.4% 0.0% Reduced 37
Boothbay Fund Management 4 133.5K 82.9K +50.5K +60.9% 0.1% Increased 35
Rokos Capital Management 2 355.0K 436.7K -81.7K -18.7% 0.4% Reduced 34
Aquatic Capital Management 4 29.2K 57.4K -28.2K -49.1% 0.0% Reduced 32
Yaupon Capital Management 2 223.9K 211.2K +12.7K +6.0% 0.4% Increased 28
Edgestream Partners 4 77.8K 105.7K -28.0K -26.4% 0.1% Reduced 27
Alphadyne Asset Management 3 15.2K 20.0K -4.8K -24.1% 0.0% Reduced 27
AQR Capital Management 3 188.2K 166.2K +22.0K +13.2% 0.0% Increased 25
Walleye Capital 3 46.2K 39.0K +7.2K +18.6% 0.0% Increased 25
Winton Group 4 13.9K 19.6K -5.7K -29.1% 0.0% Reduced 25
Voleon Capital Management 3 56.0K 64.9K -8.9K -13.7% 0.0% Reduced 24
Y-Intercept 4 96.1K 90.4K +5.7K +6.4% 0.1% Increased 19
Brevan Howard Capital Management 3 30.0K 30.2K -164 -0.5% 0.0% Reduced 19
Systematic Alpha Investments 2 6.2K 6.2K 0 +0.0% 0.0% Unchanged 18

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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.