FormFactor, Inc.
US ˙ NasdaqGS ˙ US3463751087

SecurityFORM / FormFactor, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership1,685,072 shares
Latest Disclosed Value $ 93,993,316
Sei Investments Co reports 2.74% increase in ownership of FORM / FormFactor, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 1,685,072 shares of FormFactor, Inc. (US:FORM) valued at $93,993,316 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 1,640,144 shares of FormFactor, Inc.. This represents a change in shares of 2.74% during the quarter. The current value of the position is $212,352,773 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F FORMFACTOR COM 346375108 1,685,072 44,928 2.74 93,993 57.35 0.0928
2025-11-13 2025-09-30 13F FORMFACTOR COM 346375108 1,640,144 55,101 3.48 59,734 9.52 0.0642
2025-08-14 2025-06-30 13F FORMFACTOR COM 346375108 1,585,043 26,715 1.71 54,541 23.72 0.0632
2025-05-14 2025-03-31 13F/A-1 FORMFACTOR COM 346375108 1,558,328 -37,170 -2.33 44,085 -37.20 0.0567
2025-05-13 2025-03-31 13F FORMFACTOR COM 346375108 1,595,503 5 70,194 0.0763
2025-02-11 2024-12-31 13F FORMFACTOR COM 346375108 1,595,498 409,304 34.51 70,202 28.66 0.0902
2024-11-12 2024-09-30 13F FORMFACTOR COM 346375108 1,186,194 -26,181 -2.16 54,565 -25.65 0.0709
2024-08-13 2024-06-30 13F FORMFACTOR COM 346375108 1,212,375 -281,290 -18.83 73,385 7.67 0.1040
2024-05-07 2024-03-31 13F FORMFACTOR COM 346375108 1,493,665 76,032 5.36 68,156 15.26 0.0999
2024-02-14 2023-12-31 13F FORMFACTOR COM 346375108 1,417,633 131,282 10.21 59,129 31.56 0.0949
2023-11-14 2023-09-30 13F FORMFACTOR COM 346375108 1,286,351 171,712 15.41 44,945 17.84 0.0808
2023-08-11 2023-06-30 13F FORMFACTOR COM 346375108 1,114,639 48,497 4.55 38,143 12.33 0.0665
2023-05-12 2023-03-31 13F FORMFACTOR COM 346375108 1,066,142 44,561 4.36 33,957 49.53 0.0631
2023-02-10 2022-12-31 13F FORMFACTOR COM 346375108 1,021,581 46,526 4.77 22,710 -7.03 0.0505
2022-11-14 2022-09-30 13F FORMFACTOR COM 346375108 975,055 1,075 0.11 24,426 -35.25 0.0545
2022-08-15 2022-06-30 13F FORMFACTOR COM 346375108 973,980 233,854 31.60 37,722 21.26 0.0815
2022-05-13 2022-03-31 13F FORMFACTOR COM 346375108 740,126 66,991 9.95 31,108 1.08 0.0625
2022-02-14 2021-12-31 13F FORMFACTOR COM 346375108 673,135 48,723 7.80 30,775 32.03 0.0577
2021-11-12 2021-09-30 13F FORMFACTOR COM 346375108 624,412 603,225 2,847.15 23,309 2,892.17 0.0489
2021-08-06 2021-06-30 13F FORMFACTOR COM 346375108 21,187 -9,482 -30.92 779 -43.10 0.0017
2021-05-12 2021-03-31 13F FORMFACTOR COM 346375108 30,669 -27,788 -47.54 1,369 -45.70 0.0034
2021-02-08 2020-12-31 13F FORMFACTOR COM 346375108 58,457 -33,524 -36.45 2,521 10.42 0.0065
2020-12-04 2020-09-30 13F/A-1 FORMFACTOR COM 346375108 91,981 14,409 18.58 2,283 1.02 0.0066
2020-11-06 2020-09-30 13F FORMFACTOR COM 346375108 91,981 14,409 2,283 5,496.9564
2020-08-17 2020-06-30 13F/A-1 FORMFACTOR COM 346375108 77,572 7,195 10.22 2,260 59.94 0.0070
2020-08-11 2020-06-30 13F FORMFACTOR COM 346375108 86,463 16,086 2,315 6,279.5607
2020-05-14 2020-03-31 13F FORMFACTOR COM 346375108 70,377 -21,302 -23.24 1,413 -40.53 0.0052
2020-02-06 2019-12-31 13F FORMFACTOR COM 346375108 91,679 31,806 53.12 2,376 112.90 0.0071
2019-11-12 2019-09-30 13F FORMFACTOR COM 346375108 59,873 12,569 26.57 1,116 50.61 0.0029
2019-08-14 2019-06-30 13F FORMFACTOR COM 346375108 47,304 16,178 51.98 741 47.90 0.0024
2019-05-15 2019-03-31 13F FORMFACTOR COM 346375108 31,126 28,428 1,053.67 501 1,254.05 0.0017
2019-02-13 2018-12-31 13F FORMFACTOR COM 346375108 2,698 0 0.00 37 0.00 0.0001
2018-11-08 2018-09-30 13F FORMFACTOR COM 346375108 2,698 506 23.08 37 27.59 0.0001
2018-08-03 2018-06-30 13F FORMFACTOR COM 346375108 2,192 2,192 29 0.0001
2018-05-11 2018-03-31 13F FORMFACTOR COM 346375108 0 -5,290 -100.00 0 -100.00
2018-02-08 2017-12-31 13F FORMFACTOR COM 346375108 5,290 -90 -1.67 83 -8.79 0.0003
2017-11-06 2017-09-30 13F FORMFACTOR COM 346375108 5,380 -754 -12.29 91 19.74 0.0003
2017-07-31 2017-06-30 13F FORMFACTOR COM 346375108 6,134 -369 -5.67 76 -1.30 0.0003
2017-05-05 2017-03-31 13F FORMFACTOR COM 346375108 6,503 -2,652 -28.97 77 -25.24 0.0003
2017-02-02 2016-12-31 13F FORMFACTOR COM 346375108 9,155 -95 -1.03 103 1.98 0.0005
2016-11-04 2016-09-30 13F FORMFACTOR COM 346375108 9,250 724 8.49 101 31.17 0.0005
2016-08-11 2016-06-30 13F FORMFACTOR COM 346375108 8,526 1,280 17.66 77 45.28 0.0005
2016-05-10 2016-03-31 13F/A-1 FORMFACTOR COM 346375108 7,246 281 4.03 53 -15.87 0.0003
2016-02-03 2015-12-31 13F FORMFACTOR COM 346375108 6,965 6,423 1,185.06 63 1,475.00 0.0004
2015-11-02 2015-09-30 13F/A-1 FORMFACTOR COM 346375108 542 -247 -31.31 4 -50.00 0.0000
2015-10-30 2015-09-30 13F FORMFACTOR COM 346375108 542 4
2015-08-07 2015-06-30 13F/A-1 FORMFACTOR COM 346375108 789 -100 -11.25 8 0.00 0.0001
2015-08-04 2015-06-30 13F FORMFACTOR COM 346375108 789 -100 8 0.0001
2015-05-14 2015-03-31 13F/A-1 FORMFACTOR COM 346375108 889 542 156.20 8 166.67 0.0001
2015-05-01 2015-03-31 13F FORESTAR GROUP NOTE 3.750% 3/0 346375108 889 8
2015-02-10 2014-12-31 13F FORMFACTOR COM 346375108 347 347 3 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.