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RBRK in the 13F filings

Rubrik Inc. · CUSIP 781154109

Sector · Software and IT servicesTheme · Cloud and enterprise software· L3VLUP-definedTheme · Prepackaged software
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 8 May 2026
Managers listing it
33
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 13 listed it in both
Shares listed
21,521,174
combined, among listed positions
Reported value
$1.1bn
combined, at the quarter end

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: 14 buyers (opened or added shares) and 22 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +2,096,669.

Managers listing RBRK in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

33 of 33 holders

ActionFiling
Fidelity (FMR LLC)8,261,391$405munder 0.1%Added+2,989,53115 May 2026 (the filing on sec.gov)
Two Sigma Investments LP2,313,244$113m0.09%Added+1,596,97715 May 2026 (the filing on sec.gov)
AQR Capital Management LLC2,217,221$105munder 0.1%Added+1,135,80215 May 2026 (the filing on sec.gov)
AllianceBernstein LP872,613$67munder 0.1%Added+59,29915 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP905,745$44munder 0.1%Trimmed-172,80015 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc887,640$43munder 0.1%Added+331,28115 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC817,005$40munder 0.1%Trimmed-40,89315 May 2026 (the filing on sec.gov)
Citadel Advisors LLC731,217$36munder 0.1%Added+155,34415 May 2026 (the filing on sec.gov)
Capital World Investors663,678$33munder 0.1%Newnew13 May 2026 (the filing on sec.gov)
Holocene Advisors LP555,713$27m0.07%Added+30,71315 May 2026 (the filing on sec.gov)
Wellington Management Group LLP491,674$24munder 0.1%Added+118,14115 May 2026 (the filing on sec.gov)
Millennium Management LLC399,690$20munder 0.1%Trimmed-817,16415 May 2026 (the filing on sec.gov)
ARK Investment Management LLC395,049$19m0.15%Trimmed-59,22712 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC377,489$18munder 0.1%Trimmed-345,90014 May 2026 (the filing on sec.gov)
Marshall Wace LLP363,031$18munder 0.1%Trimmed-80,67315 May 2026 (the filing on sec.gov)
Freestone Grove Partners LP243,730$12m0.08%Held015 May 2026 (the filing on sec.gov)
Baillie Gifford & Co165,108$8.1munder 0.1%Newnew8 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP161,341$7.9m0.06%Newnew14 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP124,000$6.1munder 0.1%Held013 May 2026 (the filing on sec.gov)
Invesco Ltd114,087$5.6munder 0.1%Trimmed-765,68612 May 2026 (the filing on sec.gov)
Walleye Capital LLC88,931$4.4munder 0.1%Trimmed-568,37413 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd84,993$4.2munder 0.1%Trimmed-43,72118 May 2026 (the filing on sec.gov)
Verition Fund Management LLC70,038$3.4munder 0.1%Trimmed-65915 May 2026 (the filing on sec.gov)
Bridgewater Associates LP35,725$1.7munder 0.1%Trimmed-16,19815 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.33,741$1.7munder 0.1%Trimmed-871,79915 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 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 (4)

Exited (5)

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 13 in Q2 2026

Tracked managers listing it, at least.

05101520Q2 2024Q3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
RBRK by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20248$108m80
Q3 20248$230m65
Q4 202414$612m94
Q1 202518$684m154
Q2 202520$1.4bn129
Q3 202518$912m810
Q4 202517$584m1819
Q1 202611$342m1422
Q2 202613$1.8bn1518

Compare with…

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

RBRK and GOOGL →RBRK and AMZN →RBRK and MSFT →Choose a stock to compare with RBRK →

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 RBRK, latest filings →Back to the 13F Explorer →