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FORM · Formfactor Inc

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Market Cap
$8.12B
Shares
78.12M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 511
Total Value: $11,719,492,627
Total Shares: 73,287,455
Showing 1–100 of 527 holdings by value · page 1 of 6

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 511 13F filers · Δ vs Mar 31, 2026
Top Holder
14.3%
Sep 2023 → Jun 2026 · range 14.3% – 16.3%
−2.0 pts
Top 5
34.9%
Sep 2023 → Jun 2026 · range 34.9% – 46.4%
−4.3 pts
Top 10
47.9%
Sep 2023 → Jun 2026 · range 47.9% – 62.9%
−6.0 pts
HHI
394
Sep 2023 → Jun 2026 · range 394 – 627
Broadly held−98

Quarterly Activity

vs Mar 31, 2026
New
161
Increased
145
Decreased
171
Sold Out
50
Unchanged
34
Holder count: +111
Institutional value: +61.1%
Shares held: -2.3%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 527
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1039399 CUSIP 346375108 13F (30d) 343 filings 339 filers Visit website Investor relations