FormFactor, Inc.
US ˙ NasdaqGS ˙ US3463751087

SecurityFORM / FormFactor, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership2,928,139 shares
Latest Disclosed Value $ 284,000,202
State Street Corp reports 2.04% increase in ownership of FORM / FormFactor, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 2,928,139 shares of FormFactor, Inc. (US:FORM) valued at $284,000,202 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,869,544 shares of FormFactor, Inc.. This represents a change in shares of 2.04% during the quarter. The current value of the position is $369,004,077 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)
2026-05-15 2026-03-31 13F FORMFACTOR COM 346375108 2,928,139 58,595 2.04 284,000 77.43 0.0098
2026-02-13 2025-12-31 13F FORMFACTOR COM 346375108 2,869,544 -48,050 -1.65 160,063 50.64 0.0054
2025-11-14 2025-09-30 13F FORMFACTOR COM 346375108 2,917,594 4,249 0.15 106,259 6.00 0.0037
2025-08-14 2025-06-30 13F FORMFACTOR COM 346375108 2,913,345 4,537 0.16 100,248 21.82 0.0038
2025-05-15 2025-03-31 13F FORMFACTOR COM 346375108 2,908,808 -138,150 -4.53 82,290 -38.62 0.0034
2025-02-14 2024-12-31 13F FORMFACTOR COM 346375108 3,046,958 133,495 4.58 134,066 0.04 0.0053
2024-11-14 2024-09-30 13F FORMFACTOR COM 346375108 2,913,463 39,784 1.38 134,019 -22.95 0.0055
2024-08-14 2024-06-30 13F FORMFACTOR COM 346375108 2,873,679 -22,985 -0.79 173,944 31.60 0.0076
2024-05-15 2024-03-31 13F FORMFACTOR COM 346375108 2,896,664 75,231 2.67 132,175 12.32 0.0059
2024-02-14 2023-12-31 13F FORMFACTOR COM 346375108 2,821,433 -36,192 -1.27 117,682 17.86 0.0057
2023-11-14 2023-09-30 13F FORMFACTOR COM 346375108 2,857,625 8,428 0.30 99,845 2.41 0.0055
2023-08-14 2023-06-30 13F FORMFACTOR COM 346375108 2,849,197 -1,694 -0.06 97,500 7.38 0.0051
2023-05-15 2023-03-31 13F FORMFACTOR COM 346375108 2,850,891 11,027 0.39 90,801 43.83 0.0051
2023-05-15 2022-12-31 13F/A-99 FORMFACTOR COM 346375108 2,839,864 220,465 8.42 63,130 -3.79 0.0037
2023-05-15 2022-12-31 13F FORMFACTOR COM 346375108 2,839,864 220,465 63,130 0.0037
2022-11-15 2022-09-30 13F FORMFACTOR COM 346375108 2,619,399 12,247 0.47 65,616 -35.02 0.0042
2022-08-15 2022-06-30 13F FORMFACTOR COM 346375108 2,607,152 26,632 1.03 100,975 -6.90 0.0061
2022-05-16 2022-03-31 13F FORMFACTOR COM 346375108 2,580,520 97,655 3.93 108,459 -4.46 0.0054
2022-02-14 2021-12-31 13F FORMFACTOR COM 346375108 2,482,865 103,858 4.37 113,517 27.82 0.0054
2021-11-15 2021-09-30 13F FORMFACTOR COM 346375108 2,379,007 -13,968 -0.58 88,808 1.79 0.0047
2021-08-16 2021-06-30 13F FORMFACTOR COM 346375108 2,392,975 67,300 2.89 87,248 -16.84 0.0046
2021-07-09 2021-03-31 13F/A-1 FORMFACTOR COM 346375108 2,325,675 22,305 0.97 104,911 5.87 0.0060
2021-05-17 2021-03-31 13F FORMFACTOR COM 346375108 2,325,675 22,305 104,911 0.0060
2021-02-16 2020-12-31 13F FORMFACTOR COM 346375108 2,303,370 22,343 0.98 99,091 74.25 0.0061
2020-11-10 2020-09-30 13F FORMFACTOR COM 346375108 2,281,027 -81,156 -3.44 56,866 -17.92 0.0039
2020-08-14 2020-06-30 13F FORMFACTOR COM 346375108 2,362,183 72,694 3.18 69,283 50.63 0.0050
2020-06-19 2020-03-31 13F/A-1 FORMFACTOR COM 346375108 2,289,489 52,815 2.36 45,996 -20.81 0.0040
2020-05-11 2020-03-31 13F FORMFACTOR COM 346375108 2,289,489 52,815 45,996 4,039.3749
2020-02-06 2019-12-31 13F FORMFACTOR COM 346375108 2,236,674 -92,716 -3.98 58,086 33.74 0.0040
2019-11-14 2019-09-30 13F FORMFACTOR COM 346375108 2,329,390 32,305 1.41 43,431 20.66 0.0032
2019-08-14 2019-06-30 13F FORMFACTOR COM 346375108 2,297,085 82,857 3.74 35,995 1.03 0.0027
2019-05-15 2019-03-31 13F FORMFACTOR COM 346375108 2,214,228 192,925 9.54 35,627 25.09 0.0028
2019-02-12 2018-12-31 13F FORMFACTOR COM 346375108 2,021,303 -57,726 -2.78 28,480 -0.39 0.0026
2018-11-09 2018-09-30 13F FORMFACTOR Common equity shares 346375108 2,079,029 89,360 4.49 28,591 8.02 0.0022
2018-08-14 2018-06-30 13F FORMFACTOR Common equity shares 346375108 1,989,669 151,465 8.24 26,468 5.49 0.0022
2018-05-15 2018-03-31 13F FORMFACTOR Common equity shares 346375108 1,838,204 360,520 24.40 25,090 8.49 0.0021
2018-02-14 2017-12-31 13F FORMFACTOR Common equity shares 346375108 1,477,684 120,000 8.84 23,126 1.07 0.0019
2017-11-14 2017-09-30 13F FORMFACTOR Common equity shares 346375108 1,357,684 30,683 2.31 22,881 39.06 0.0020
2017-08-14 2017-06-30 13F FORMFACTOR Common equity shares 346375108 1,327,001 66,847 5.30 16,454 10.19 0.0015
2017-05-15 2017-03-31 13F FORMFACTOR Common equity shares 346375108 1,260,154 -3,679 -0.29 14,932 5.49 0.0013
2017-02-09 2016-12-31 13F FORMFACTOR Common equity shares 346375108 1,263,833 92,544 7.90 14,155 11.39 0.0013
2017-01-13 2016-09-30 13F/A-1 FORMFACTOR Common equity shares 346375108 1,171,289 42,465 3.76 12,708 25.23 0.0013
2016-11-14 2016-09-30 13F FORMFACTOR Common equity shares 346375108 1,171,289 12,708
2016-08-12 2016-06-30 13F FORMFACTOR Common equity shares 346375108 1,128,824 5,907 0.53 10,148 24.36 0.0011
2016-05-20 2016-03-31 13F/A-1 FORMFACTOR Common equity shares 346375108 1,122,917 -2,157 -0.19 8,160 -19.40 0.0009
2016-05-12 2016-03-31 13F FORMFACTOR Common equity shares 346375108 1,122,917 8,160
2016-02-16 2015-12-31 13F FORMFACTOR Common equity shares 346375108 1,125,074 52,120 4.86 10,124 39.12 0.0011
2015-11-16 2015-09-30 13F FORMFACTOR Common equity shares 346375108 1,072,954 57,312 5.64 7,277 -22.12 0.0008
2015-08-13 2015-06-30 13F FORMFACTOR Common equity shares 346375108 1,015,642 82,201 8.81 9,344 12.86 0.0010
2015-05-15 2015-03-31 13F FORMFACTOR Common equity shares 346375108 933,441 18,560 2.03 8,279 5.22 0.0008
2015-02-11 2014-12-31 13F FORMFACTOR Common equity shares 346375108 914,881 16,652 1.85 7,868 22.14 0.0008
2014-11-12 2014-09-30 13F/A-1 FORMFACTOR Common equity shares 346375108 898,229 -15,425 -1.69 6,442 -15.25 0.0007
2014-11-10 2014-09-30 13F FORMFACTOR Common equity shares 346375108 898,229 6,442
2014-08-12 2014-06-30 13F FORMFACTOR Common equity shares 346375108 913,654 -11,446 -1.24 7,601 28.55 0.0008
2014-05-15 2014-03-31 13F/A-1 FORMFACTOR Common equity shares 346375108 925,100 44,361 5.04 5,913 11.54 0.0007
2014-05-13 2014-03-31 13F FORMFACTOR Common equity shares 346375108 925,100 5,913
2014-02-06 2013-12-31 13F/A-1 FORMFACTOR Common equity shares 346375108 880,739 -8,778 -0.99 5,301 -13.16 0.0006
2014-02-06 2013-12-31 13F FORMFACTOR Common equity shares 346375108 896,304 4,084
2013-11-12 2013-09-30 13F FORMFACTOR Common equity shares 346375108 889,517 25,156 2.91 6,104 4.61 0.0008
2013-08-08 2013-06-30 13F FORMFACTOR Common equity shares 346375108 864,361 864,361 5,835 0.0008
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.