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RMBS in the 13F filings

Rambus Inc Del · CUSIP 750917106

Sector · SemiconductorsTheme · AI infrastructure and semiconductors· L3VLUP-definedTheme · Semiconductors
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
30 Jun 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 3 Aug 2026
Managers listing it
26
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 6 listed it in both
Shares listed
26,715,794
combined, among listed positions
Reported value
$3.5bn
combined, at the quarter end

1 line marked †. Value as filed implies a price far from other filers'. Each counts in holders and value as filed, and is left out of the net change in shares.

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 17 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +8,753,917.

Managers listing RMBS in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

26 of 26 holders

ActionFiling
Fidelity (FMR LLC)10,460,026$1.4bn0.06%Added+7,141,57713 Aug 2026 (the filing on sec.gov)
Invesco Ltd6,632,458$880m0.07%Added+133,41014 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc3,334,512$443munder 0.1%Trimmed-42,17714 Aug 2026 (the filing on sec.gov)
Neuberger Berman Group LLC1,311,777$173m0.12%Added+9,60827 Oct 2026 (the filing on sec.gov)
AQR Capital Management LLC† Value as filed implies a price far from other filers'.1,211,009$152m0.05%Trimmed-39,44714 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.739,701$98munder 0.1%Added+726,89614 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP555,935$74munder 0.1%Added+470,11114 Aug 2026 (the filing on sec.gov)
Millennium Management LLC472,818$63munder 0.1%Added+331,50414 Aug 2026 (the filing on sec.gov)
Wellington Management Group LLP418,533$56munder 0.1%Trimmed-438,06514 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC400,151$53munder 0.1%Added+383,6562 Sep 2026 (the filing on sec.gov)
Janus Henderson Group Ltd288,553$38munder 0.1%Trimmed-70,33914 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP222,921$30munder 0.1%Added+145,51114 Aug 2026 (the filing on sec.gov)
Tudor Investment Corp157,155$21munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP155,136$13munder 0.1%Trimmed-112,05314 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC95,013$13munder 0.1%Added+89,58714 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP56,425$7.5munder 0.1%Added+50,89913 Aug 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP43,098$5.7munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Man Group PLC38,613$5.1munder 0.1%Trimmed-100,51914 Aug 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP38,091$5.1munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP22,020$2.9munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Acadian Asset Management LLC16,889$2.2munder 0.1%Trimmed-20713 Aug 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC14,000$1.9munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Walleye Capital LLC12,815$1.7munder 0.1%Added+12,7963 Aug 2026 (the filing on sec.gov)
Discovery Capital Management LLC9,965$1.3m0.05%Newnew14 Aug 2026 (the filing on sec.gov)
Maverick Capital Ltd4,309$572kunder 0.1%Trimmed-8,71914 Aug 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (3)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
8 in Q3 2024 to 12 in Q2 2026

Tracked managers listing it, at least.

0510152014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
RMBS by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20131$33kn.a.n.a.
Q1 20142$7.1mn.a.n.a.
Q2 20142$19mn.a.n.a.
Q3 20141$14mn.a.n.a.
Q4 20141$242kn.a.n.a.
Q1 20151$5.0mn.a.n.a.
Q2 20153$65mn.a.n.a.
Q3 20154$61mn.a.n.a.
Q4 20152$64mn.a.n.a.
Q1 20163$76mn.a.n.a.
Q2 20161$44mn.a.n.a.
Q3 20163$47mn.a.n.a.
Q4 20161$49mn.a.n.a.
Q1 20171$48mn.a.n.a.
Q2 20173$44mn.a.n.a.
Q3 20173$95mn.a.n.a.
Q4 20173$109mn.a.n.a.
Q1 20185$106mn.a.n.a.
Q2 20183$95mn.a.n.a.
Q3 20181$1.2mn.a.n.a.
Q4 20182$1.2mn.a.n.a.
Q1 20193$2.7mn.a.n.a.
Q2 20194$90mn.a.n.a.
Q3 20193$97mn.a.n.a.
Q4 20196$121mn.a.n.a.
Q1 20202$83mn.a.n.a.
Q2 20203$109mn.a.n.a.
Q3 20203$92mn.a.n.a.
Q4 20206$116mn.a.n.a.
Q1 20214$109mn.a.n.a.
Q2 20216$133mn.a.n.a.
Q3 20213$105mn.a.n.a.
Q4 20214$118mn.a.n.a.
Q1 20226$163mn.a.n.a.
Q2 20222$109mn.a.n.a.
Q3 20224$142mn.a.n.a.
Q4 20226$227mn.a.n.a.
Q1 20239$464mn.a.n.a.
Q2 20239$319mn.a.n.a.
Q3 20234$279mn.a.n.a.
Q4 20235$574m34
Q1 20244$518m40
Q2 20246$558m33
Q3 20248$174m72
Q4 20245$432m23
Q1 20256$555m42
Q2 20254$403m22
Q3 20256$966m52
Q4 20257$1.2bn198
Q1 20268$1.1bn821
Q2 202612$3.2bn1712

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

RMBS and NVDA →RMBS and AVGO →RMBS and MU →Choose a stock to compare with RMBS →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own RMBS, latest filings →Back to the 13F Explorer →