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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
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 10 Feb 2026
Managers listing it
26
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 6 listed it in both
Shares listed
17,685,492
combined, among listed positions
Reported value
$1.6bn
combined, at the quarter end

Among the 92 comparable managers: 19 buyers (opened or added shares) and 8 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +2,157,939.

Managers listing RMBS in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, 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
T. Rowe Price Associates Inc5,385,570$495m0.05%Added+140,22617 Feb 2026 (the filing on sec.gov)
Invesco Ltd4,148,653$381munder 0.1%Added+1,716,62119 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP1,900,308$175m0.06%Added+78,27817 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)1,587,029$146munder 0.1%Added+213,50517 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC1,305,951$120m0.09%Trimmed-176,05727 Oct 2026 (the filing on sec.gov)
Wellington Management Group LLP933,934$86munder 0.1%Added+183,48817 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC711,126$65munder 0.1%Added+163,52217 Feb 2026 (the filing on sec.gov)
Janus Henderson Group Ltd379,515$35munder 0.1%Trimmed-4,48917 Feb 2026 (the filing on sec.gov)
Millennium Management LLC262,578$24munder 0.1%Added+65,34617 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC169,902$16munder 0.1%Added+101,19917 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC169,421$16munder 0.1%Added+8,29310 Feb 2026 (the filing on sec.gov)
Man Group PLC162,940$15munder 0.1%Added+28,56517 Feb 2026 (the filing on sec.gov)
Bridgewater Associates LP154,296$14m0.05%Trimmed-20,81813 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP144,403$13munder 0.1%Added+66,51317 Feb 2026 (the filing on sec.gov)
Tudor Investment Corp101,605$9.3munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Two Sigma Advisers LP46,700$4.3munder 0.1%Added+6,60017 Feb 2026 (the filing on sec.gov)
Point72 Asset Management LP30,021$2.8munder 0.1%Trimmed-136,64617 Feb 2026 (the filing on sec.gov)
Walleye Capital LLC20,794$1.9munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.18,491$1.7munder 0.1%Trimmed-67,61217 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP16,300$1.5munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP13,834$1.3munder 0.1%Added+3,48517 Feb 2026 (the filing on sec.gov)
Squarepoint Ops LLC5,496$505kunder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC5,455$501kunder 0.1%Trimmed-187,69512 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC4,091$376kunder 0.1%Trimmed-2,30613 Feb 2026 (the filing on sec.gov)
Freestone Grove Partners LP3,574$328kunder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, 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 (1)

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 →