Ultra Clean Holdings, Inc.
US ˙ NasdaqGS ˙ US90385V1070

SecurityUCTT / Ultra Clean Holdings, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership1,837,824 shares
Latest Disclosed Value $ 114,275,896
State Street Corp reports 0.79% decrease in ownership of UCTT / Ultra Clean Holdings, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 1,837,824 shares of Ultra Clean Holdings, Inc. (US:UCTT) valued at $114,275,896 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,852,482 shares of Ultra Clean Holdings, Inc.. This represents a change in shares of -0.79% during the quarter. The current value of the position is $172,185,731 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.

Upgrade to unlock premium data and export to Excel .

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 ULTRA CLEAN HLDGS COM 90385V107 1,837,824 -14,658 -0.79 114,276 143.54 0.0039
2026-02-13 2025-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,852,482 87,931 4.98 46,923 -2.41 0.0016
2025-11-14 2025-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,764,551 27,249 1.57 48,084 22.63 0.0017
2025-08-14 2025-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,737,302 -31,424 -1.78 39,211 3.54 0.0015
2025-05-15 2025-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,768,726 -52,246 -2.87 37,868 -42.15 0.0016
2025-02-14 2024-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,820,972 72,893 4.17 65,464 -6.21 0.0026
2024-11-14 2024-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,748,079 -3,927 -0.22 69,801 -18.69 0.0028
2024-08-14 2024-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,752,006 -87,595 -4.76 85,848 1.58 0.0038
2024-05-15 2024-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,839,601 8,688 0.47 84,511 35.20 0.0038
2024-02-14 2023-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,830,913 109,521 6.36 62,507 22.39 0.0030
2023-11-14 2023-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,721,392 3,753 0.22 51,074 -22.69 0.0028
2023-08-14 2023-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,717,639 21,864 1.29 66,060 17.48 0.0035
2023-05-15 2023-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,695,775 15,307 0.91 56,232 0.94 0.0032
2023-05-15 2022-12-31 13F/A-99 ULTRA CLEAN HLDGS COM 90385V107 1,680,468 143,666 9.35 55,708 40.77 0.0033
2023-05-15 2022-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,680,468 143,666 55,708 0.0033
2022-11-15 2022-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,536,802 26,356 1.74 39,573 -11.99 0.0025
2022-08-15 2022-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,510,446 30,277 2.05 44,966 -28.33 0.0027
2022-05-16 2022-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,480,169 58,656 4.13 62,744 -23.05 0.0031
2022-02-14 2021-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,421,513 -13,247 -0.92 81,538 33.40 0.0039
2021-11-15 2021-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,434,760 52,336 3.79 61,121 -17.70 0.0032
2021-08-16 2021-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,382,424 104,294 8.16 74,264 0.11 0.0039
2021-07-09 2021-03-31 13F/A-1 ULTRA CLEAN HLDGS COM 90385V107 1,278,130 -8,042 -0.63 74,183 85.16 0.0043
2021-05-17 2021-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,278,130 -8,042 74,183 0.0043
2021-02-16 2020-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,286,172 29,560 2.35 40,064 48.57 0.0025
2020-11-10 2020-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,256,612 -47,535 -3.64 26,967 -8.63 0.0018
2020-08-14 2020-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,304,147 64,421 5.20 29,513 72.51 0.0021
2020-06-19 2020-03-31 13F/A-1 ULTRA CLEAN HLDGS COM 90385V107 1,239,726 -51,453 -3.98 17,108 -43.55 0.0015
2020-05-11 2020-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,239,726 -51,453 17,108 1,502.4269
2020-02-06 2019-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,291,179 -35,749 -2.69 30,304 56.05 0.0021
2019-11-14 2019-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,326,928 17,844 1.36 19,420 6.57 0.0014
2019-08-14 2019-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,309,084 43,199 3.41 18,222 39.08 0.0014
2019-05-15 2019-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,265,885 118,312 10.31 13,102 34.79 0.0010
2019-02-12 2018-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,147,573 -10,781 -0.93 9,720 -33.14 0.0009
2018-11-09 2018-09-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 1,158,354 44,471 3.99 14,538 -21.39 0.0011
2018-08-14 2018-06-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 1,113,883 140,057 14.38 18,495 -1.34 0.0015
2018-05-15 2018-03-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 973,826 315,780 47.99 18,746 23.38 0.0016
2018-02-14 2017-12-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 658,046 56,662 9.42 15,194 -17.49 0.0012
2017-11-14 2017-09-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 601,384 -528 -0.09 18,414 63.17 0.0016
2017-08-14 2017-06-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 601,912 74,084 14.04 11,285 26.73 0.0010
2017-05-15 2017-03-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 527,828 31,376 6.32 8,905 84.87 0.0008
2017-02-09 2016-12-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 496,452 47,985 10.70 4,817 44.83 0.0005
2017-01-13 2016-09-30 13F/A-1 ULTRA CLEAN HOLDINGS Common equity shares 90385V107 448,467 32,383 7.78 3,326 40.75 0.0003
2016-11-14 2016-09-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 448,467 3,326
2016-08-12 2016-06-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 416,084 -4,058 -0.97 2,363 4.88 0.0003
2016-05-20 2016-03-31 13F/A-1 ULTRA CLEAN HOLDINGS Common equity shares 90385V107 420,142 12,314 3.02 2,253 7.75 0.0002
2016-05-12 2016-03-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 420,142 2,253
2016-02-16 2015-12-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 407,828 1,040 0.26 2,091 -10.49 0.0002
2015-11-16 2015-09-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 406,788 -22,281 -5.19 2,336 -12.67 0.0003
2015-08-13 2015-06-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 429,069 -134,178 -23.82 2,675 -33.57 0.0003
2015-05-15 2015-03-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 563,247 13,378 2.43 4,027 -21.07 0.0004
2015-02-11 2014-12-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 549,869 929 0.17 5,102 3.85 0.0005
2014-11-12 2014-09-30 13F/A-1 ULTRA CLEAN HOLDINGS Common equity shares 90385V107 548,940 10,994 2.04 4,913 0.95 0.0005
2014-11-10 2014-09-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 548,940 4,913
2014-08-12 2014-06-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 537,946 160,489 42.52 4,867 -1.95 0.0005
2014-05-15 2014-03-31 13F/A-1 ULTRA CLEAN HOLDINGS Common equity shares 90385V107 377,457 27,222 7.77 4,964 41.34 0.0006
2014-05-13 2014-03-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 378,357 4,976
2014-02-06 2013-12-31 13F/A-1 ULTRA CLEAN HOLDINGS Common equity shares 90385V107 350,235 -29,444 -7.75 3,512 33.84 0.0004
2014-02-06 2013-12-31 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 496,618 2,437
2013-11-12 2013-09-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 379,679 -20,878 -5.21 2,624 8.43 0.0003
2013-08-08 2013-06-30 13F ULTRA CLEAN HOLDINGS Common equity shares 90385V107 400,557 400,557 2,420 0.0003
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.