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FORM in the 13F filings

Formfactor Inc · CUSIP 346375108

Sector · SemiconductorsTheme · AI infrastructure and semiconductors· L3VLUP-definedTheme · Semiconductors
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
31
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 4 listed it in both
Shares listed
9,095,627
combined, among listed positions
Reported value
$790m
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: 22 buyers (opened or added shares) and 13 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +2,050,737.

Managers listing FORM 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.

31 of 31 holders

ActionFiling
AllianceBernstein LP2,231,533$124munder 0.1%Added+816,84515 May 2026 (the filing on sec.gov)
Invesco Ltd1,238,363$120munder 0.1%Added+905,43612 May 2026 (the filing on sec.gov)
Jane Street Group LLC925,617$90munder 0.1%Added+807,08312 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc840,631$82munder 0.1%Trimmed-123,94715 May 2026 (the filing on sec.gov)
MFS Investment Management733,338$71munder 0.1%Trimmed-635,68614 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP508,642$49munder 0.1%Trimmed-93,12114 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)325,832$32munder 0.1%Added+304,11615 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.242,643$24munder 0.1%Added+182,58815 May 2026 (the filing on sec.gov)
AQR Capital Management LLC215,013$21munder 0.1%Added+10,24515 May 2026 (the filing on sec.gov)
Two Sigma Investments LP213,456$21munder 0.1%Added+99,70315 May 2026 (the filing on sec.gov)
Citadel Advisors LLC200,874$19munder 0.1%Added+7,86515 May 2026 (the filing on sec.gov)
Millennium Management LLC180,937$18munder 0.1%Added+98,56815 May 2026 (the filing on sec.gov)
First Eagle Investment Management LLC179,848$17munder 0.1%Trimmed-89,37414 May 2026 (the filing on sec.gov)
Acadian Asset Management LLC172,200$17munder 0.1%Added+104,30213 May 2026 (the filing on sec.gov)
Man Group PLC161,011$16munder 0.1%Added+153,49515 May 2026 (the filing on sec.gov)
Tudor Investment Corp141,282$14munder 0.1%Added+90,54115 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC101,752$9.9munder 0.1%Added+84,72515 May 2026 (the filing on sec.gov)
Marshall Wace LLP99,719$9.7munder 0.1%Added+31,06615 May 2026 (the filing on sec.gov)
Wellington Management Group LLP80,333$7.8munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Farallon Capital Management LLC56,500$5.5munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
PDT Partners LLC51,112$5.0m0.29%Held015 May 2026 (the filing on sec.gov)
Bridgewater Associates LP50,221$4.9munder 0.1%Added+24,24215 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP44,777$4.3munder 0.1%Added+10,07815 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd35,569$3.5munder 0.1%Added+2,70018 May 2026 (the filing on sec.gov)
Point72 Asset Management LP28,162$2.7munder 0.1%Trimmed-401,92515 May 2026 (the filing on sec.gov)
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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.
3 in Q3 2024 to 14 in Q2 2026

Tracked managers listing it, at least.

0510152015201820192020202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
FORM by quarter
QuarterHoldersReported valueBuyersSellers
Q1 20151$171kn.a.n.a.
Q2 20171$6.9mn.a.n.a.
Q3 20171$871kn.a.n.a.
Q4 20172$1.6mn.a.n.a.
Q1 20181$2.9mn.a.n.a.
Q4 20182$125mn.a.n.a.
Q1 20191$11mn.a.n.a.
Q3 20192$152mn.a.n.a.
Q4 20195$201mn.a.n.a.
Q1 20203$116mn.a.n.a.
Q2 20205$162mn.a.n.a.
Q3 20203$133mn.a.n.a.
Q4 20201$209mn.a.n.a.
Q1 20212$203mn.a.n.a.
Q2 20212$836kn.a.n.a.
Q3 20211$331kn.a.n.a.
Q4 20211$542kn.a.n.a.
Q1 20222$84mn.a.n.a.
Q2 20222$84mn.a.n.a.
Q3 20222$54mn.a.n.a.
Q4 20222$64mn.a.n.a.
Q1 20234$180mn.a.n.a.
Q2 20235$171mn.a.n.a.
Q3 20236$191mn.a.n.a.
Q4 20236$204m13
Q1 20244$151m23
Q2 20244$167m04
Q3 20243$55m12
Q4 20244$190m21
Q1 20253$144m13
Q2 20255$180m41
Q3 20255$193m31
Q4 20256$196m1716
Q1 20268$294m2213
Q2 202614$660m2513

Compare with…

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

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

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