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Rambus Inc. (RMBS) institutional ownership

Latest close $111.51 Jul 10, 2026
Market cap$11.5B 52-week range SectorTechnology
Funds holding · Q1 2026
540
reported RMBS position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Net bought $316M
259 buyers · 281 sellers

Rambus Inc. (RMBS) price and institutional activity

Dates

Q1 2026

$1.6B bought by 259 investors
Invesco Ltd.$235MFMR LLC$173M +257 more
$1.3B sold by 281 investors
T. Rowe Price Associates-$200MNorges-$170M +279 more
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Bought Sold Totals per quarter; hover a bar for the names.

Rambus Inc. (RMBS) institutional activity · 540

Investor Type Est. change Change Δ Own Date
Invesco Ltd. · Added +$235M
Change +2.4M Δ Own +56.7% Date Q1 2026
Invesco Ltd. Added· Q1 2026 +$235M +2.4M +56.7% Q1 2026
T. Rowe Price Associates · Reduced −$200M
Change −2.0M Date Q1 2026
T. Rowe Price Associates Reduced· Q1 2026 −$200M −2.0M Q1 2026
FMR LLC · Added +$173M
Change +1.7M Δ Own +109.1% Date Q1 2026
FMR LLC Added· Q1 2026 +$173M +1.7M +109.1% Q1 2026
T. Rowe Price Investment Management, Inc. · Added +$170M
Change +1.7M Date Q1 2026
T. Rowe Price Investment Management, Inc. Added· Q1 2026 +$170M +1.7M Q1 2026
Norges · Exited −$170M
Change −1.7M Δ Own −100.0% Date Q1 2026
Norges Exited· Q1 2026 −$170M −1.7M −100.0% Q1 2026
Alliancebernstein L.P. · Reduced −$163M
Change −1.6M Date Q1 2026
Alliancebernstein L.P. Reduced· Q1 2026 −$163M −1.6M Q1 2026
Bessemer Group Inc · Added +$94M
Change +946K Date Q1 2026
Bessemer Group Inc Added· Q1 2026 +$94M +946K Q1 2026
Driehaus Capital Management LLC · Reduced −$78M
Change −780K Date Q1 2026
Driehaus Capital Management LLC Reduced· Q1 2026 −$78M −780K Q1 2026
Pointstate Capital LP · New +$70M
Change +701K Date Q1 2026
Pointstate Capital LP New· Q1 2026 +$70M +701K Q1 2026
Clearbridge Investments, LLC · New +$58M
Change +583K Date Q1 2026
Clearbridge Investments, LLC New· Q1 2026 +$58M +583K Q1 2026
Edgepoint Investment Group Inc. · Added +$54M
Change +541K Date Q1 2026
Edgepoint Investment Group Inc. Added· Q1 2026 +$54M +541K Q1 2026
AQR Capital Management LLC · Added +$54M
Change +539K Date Q1 2026
AQR Capital Management LLC Added· Q1 2026 +$54M +539K Q1 2026
Citigroup Inc · Added +$50M
Change +505K Date Q1 2026
Citigroup Inc Added· Q1 2026 +$50M +505K Q1 2026
UBS Group AG · Added +$50M
Change +501K Date Q1 2026
UBS Group AG Added· Q1 2026 +$50M +501K Q1 2026
Allspring Global Investments Holdings, LLC · Reduced −$45M
Change −456K Date Q1 2026
Allspring Global Investments Holdings, LLC Reduced· Q1 2026 −$45M −456K Q1 2026
Data through Q1 2026 · filed Jun 3, 2026
15 of 540

Famous investor activity in Rambus Inc. (RMBS)

Rambus Inc. (RMBS) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Sayiner Necip · Director Sell −$851K
Price $170.15 Qty −5K Owned 18K Trade date Jun 3, 2026 Filed date Jun 3, 2026
Sayiner Necip Director Sell $170.15 −5K −$851K 18K Jun 3, 2026 Jun 3, 2026
Higashi Emiko · Director 2 operations −$1.6M
Price $158.00–$163.00 Qty −10K Owned 50K Trade date Jun 2, 2026 Filed date Jun 3, 2026
Higashi Emiko Director 2 operations $158.00–$163.00 −10K −$1.6M 50K Jun 2, 2026 Jun 3, 2026
Stang Eric B. · Director Sell −$730K
Price $146.00 Qty −5K Owned 19K Trade date Jun 1, 2026 Filed date Jun 2, 2026
Stang Eric B. Director Sell $146.00 −5K −$730K 19K Jun 1, 2026 Jun 2, 2026
Higashi Emiko · Director Sell −$788K
Price $157.57 Qty −5K Owned 60K Trade date May 26, 2026 Filed date May 27, 2026
Higashi Emiko Director Sell $157.57 −5K −$788K 60K May 26, 2026 May 27, 2026
Fan Xianzhi Sean · Officer 2 operations −$5.8M
Price $151.69–$152.35 Qty −38K Owned 168K Trade date May 26, 2026 Filed date May 26, 2026
Fan Xianzhi Sean Officer 2 operations $151.69–$152.35 −38K −$5.8M 168K May 26, 2026 May 26, 2026
Shinn John · Officer Sell −$144K
Price $143.63 Qty −1K Owned 21K Trade date May 22, 2026 Filed date May 26, 2026
Shinn John Officer Sell $143.63 −1K −$144K 21K May 22, 2026 May 26, 2026
Sayiner Necip · Director Sell −$1.3M
Price $130.18 Qty −10K Owned 23K Trade date May 8, 2026 Filed date May 11, 2026
Sayiner Necip Director Sell $130.18 −10K −$1.3M 23K May 8, 2026 May 11, 2026
Laub Steven · Director Sell −$188K
Price $125.52 Qty −2K Owned 8K Trade date May 7, 2026 Filed date May 11, 2026
Laub Steven Director Sell $125.52 −2K −$188K 8K May 7, 2026 May 11, 2026
Gagneja Sumeet · Officer 2 operations 41K
Owned 41K Trade date May 1, 2026 Filed date May 4, 2026
Gagneja Sumeet Officer 2 operations 41K 41K May 1, 2026 May 4, 2026
Rao Meera · Director Sell −$447K
Price $150.30 Qty −3K Owned 20K Trade date Apr 24, 2026 Filed date Apr 27, 2026
Rao Meera Director Sell $150.30 −3K −$447K 20K Apr 24, 2026 Apr 27, 2026
Rao Meera · Director Sell −$1.0M
Price $118.08 Qty −9K Owned 23K Trade date Apr 14, 2026 Filed date Apr 15, 2026
Rao Meera Director Sell $118.08 −9K −$1.0M 23K Apr 14, 2026 Apr 15, 2026
Allen John K. · Officer Tax withholding or exercise payment (F) -$104K
Price $92.22 Qty -1K Owned 17K Trade date Apr 3, 2026 Filed date Apr 7, 2026
Allen John K. Officer Tax withholding or exercise payment (F) $92.22 -1K -$104K 17K Apr 3, 2026 Apr 7, 2026
Seraphin Luc · Director 3 operations −$470K
Price $86.04–$88.35 Qty −5K Owned 346K Trade date Apr 2, 2026 Filed date Apr 3, 2026
Seraphin Luc Director 3 operations $86.04–$88.35 −5K −$470K 346K Apr 2, 2026 Apr 3, 2026
Higashi Emiko · Director Grant (A) 2K
Owned 65K Trade date Apr 1, 2026 Filed date Apr 3, 2026
Higashi Emiko Director Grant (A) 2K 65K Apr 1, 2026 Apr 3, 2026
Laub Steven · Director Grant (A) 2K
Owned 9K Trade date Apr 1, 2026 Filed date Apr 3, 2026
Laub Steven Director Grant (A) 2K 9K Apr 1, 2026 Apr 3, 2026
15 of 56
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Rambus Inc. (RMBS) activist and large shareholders

What are Schedules 13D and 13G?

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
BlackRock Inc. 15.5M
% of shares outstanding 14.4% Filing date Jan 23, 2024
BlackRock Inc. 15.5M 14.4% Jan 23, 2024
Blackrock, Inc. 13.7M
% of shares outstanding 12.7% Filing date Nov 8, 2024
Blackrock, Inc. 13.7M 12.7% Nov 8, 2024
Vanguard Group Inc 12.6M
% of shares outstanding 11.7% Filing date Nov 12, 2024
Vanguard Group Inc 12.6M 11.7% Nov 12, 2024
FMR LLC 11.3M
% of shares outstanding 10.4% Filing date Jun 5, 2026
FMR LLC 11.3M 10.4% Jun 5, 2026
Vanguard Portfolio Management 6.7M
% of shares outstanding 6.2% Filing date Apr 29, 2026
Vanguard Portfolio Management 6.7M 6.2% Apr 29, 2026
Invesco Ltd. 6.5M
% of shares outstanding 6.0% Filing date May 6, 2026
Invesco Ltd. 6.5M 6.0% May 6, 2026
Vanguard Capital Management 5.7M
% of shares outstanding 5.2% Filing date Apr 30, 2026
Vanguard Capital Management 5.7M 5.2% Apr 30, 2026
T. Rowe Price Associates, Inc. 3.4M
% of shares outstanding 3.1% Filing date May 15, 2026
T. Rowe Price Associates, Inc. 3.4M 3.1% May 15, 2026
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Rambus Inc. (RMBS) ownership FAQ

Who owns RMBS?

540 reporting institutions disclosed RMBS position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.