RMBS Rambus, Inc.

NASDAQ
$86.97

Rambus, Inc. (RMBS) 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
+41.18
24 buyers / 10 sellers
STRONG BUYING
Funds compared
34
funds with comparable RMBS positions
29 current holders · 20 prior-quarter holders
Net share change
+2.17M
+2.58M added, -411.7K cut
Position activity
14 new 10 increased 5 reduced 5 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
Maple Rock Capital Partners Long/Short New +342.6K — $45.5M 0.9% 65
Steadfast Capital Management Long/Short Sold Out -153.3K -100.0% $20.3M 0.0% 62
Qube Research & Technologies Ltd Quant New +89.5K — $11.9M 0.0% 59
D. E. Shaw & Co., Inc. Quant Increased +726.9K +5676.7% $96.5M 0.1% 58
Tudor Investment Corporation Macro New +157.2K — $20.9M 0.1% 58
CITADEL ADVISORS LLC Quant Increased +383.7K +2325.9% $50.9M 0.0% 58
WORLDQUANT MILLENNIUM ADVISORS LLC Quant New +14.1K — $1.9M 0.0% 58
Holocene Advisors, LP Sold Out -49.6K -100.0% $6.6M 0.0% 58
Discovery Capital Management Long/Short Macro New +10.0K — $1.3M 0.1% 56
MILLENNIUM MANAGEMENT LLC Increased +331.5K +234.6% $44.0M 0.0% 55

Most significant buyers

By move score, not size.

  • Maple Rock Capital Partners New · +342.6K
  • Qube Research & Technologies Ltd New · +89.5K
  • D. E. Shaw & Co., Inc. Increased · +726.9K
  • Tudor Investment Corporation New · +157.2K
  • CITADEL ADVISORS LLC Increased · +383.7K

Most significant sellers

By move score, not size.

  • Steadfast Capital Management Sold Out · -153.3K
  • Holocene Advisors, LP Sold Out · -49.6K
  • Bridgewater Associates Reduced · -48.0K
  • Systematic Alpha Investments Sold Out · -5.3K
  • Winton Group Sold Out · -3.1K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Maple Rock Capital Partners 2 342.6K 0 +342.6K — 0.9% New 65
Steadfast Capital Management 2 0 153.3K -153.3K -100.0% 0.0% Sold Out 62
Qube Research & Technologies Ltd 2 89.5K 0 +89.5K — 0.0% New 59
D. E. Shaw & Co., Inc. 1 739.7K 12.8K +726.9K +5676.7% 0.1% Increased 58
Tudor Investment Corporation 2 157.2K 0 +157.2K — 0.1% New 58
CITADEL ADVISORS LLC 1 400.2K 16.5K +383.7K +2325.9% 0.0% Increased 58
WORLDQUANT MILLENNIUM ADVISORS LLC 2 14.1K 0 +14.1K — 0.0% New 58
Holocene Advisors, LP 2 0 49.6K -49.6K -100.0% 0.0% Sold Out 58
Discovery Capital Management 2 10.0K 0 +10.0K — 0.1% New 56
MILLENNIUM MANAGEMENT LLC 2 472.8K 141.3K +331.5K +234.6% 0.0% Increased 55
Hudson Bay Capital Management 3 22.0K 0 +22.0K — 0.0% New 55
Bridgewater Associates 1 3.9K 51.9K -48.0K -92.5% 0.0% Reduced 55
LMR Partners 3 13.9K 0 +13.9K — 0.0% New 55
TWO SIGMA INVESTMENTS, LP 2 222.9K 77.4K +145.5K +188.0% 0.0% Increased 55
ExodusPoint Capital Management 3 38.1K 0 +38.1K — 0.0% New 54
Sona Asset Management 3 10.0K 0 +10.0K — 0.1% New 54
Systematic Alpha Investments 2 0 5.3K -5.3K -100.0% 0.0% Sold Out 54
Schonfeld Strategic Advisors 3 14.0K 0 +14.0K — 0.0% New 53
MARSHALL WACE, LLP 2 56.4K 5.5K +50.9K +921.1% 0.0% Increased 52
Brevan Howard Capital Management 3 43.1K 0 +43.1K — 0.1% New 52
Engineers Gate 4 35.9K 0 +35.9K — 0.1% New 50
Parallax Volatility Advisers 3 4.6K 0 +4.6K — 0.0% New 50
Graham Capital Management 3 3.3K 0 +3.3K — 0.0% New 49
Winton Group 4 0 3.1K -3.1K -100.0% 0.0% Sold Out 48
Centiva Capital 4 0 3.0K -3.0K -100.0% 0.0% Sold Out 48
Walleye Capital 3 12.8K 19 +12.8K +67347.4% 0.0% Increased 47
Y-Intercept 4 94.7K 36.9K +57.8K +156.6% 0.3% Increased 45
Maverick Capital 2 4.3K 13.0K -8.7K -66.9% 0.0% Reduced 45
Man Group 3 38.6K 139.1K -100.5K -72.2% 0.0% Reduced 43
PointState Capital 2 764.2K 701.3K +62.9K +9.0% 1.8% Increased 40
Weiss Asset Management 2 73.8K 63.1K +10.7K +16.9% 0.2% Increased 30
Gotham Asset Management, LLC 2 5.0K 5.9K -832 -14.2% 0.0% Reduced 27
CenterBook Partners 4 7.0K 5.4K +1.6K +28.8% 0.0% Increased 25
AQR Capital Management 3 1.2M 1.3M -39.4K -3.2% 0.1% Reduced 23

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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.