Ultra Clean Holdings, Inc.
DE ˙ DB ˙ US90385V1070
76,52 € ↓ -4,30 (-5,32%)
2026-06-05
DEL PRIS
SecurityDE:UCE / Ultra Clean Holdings, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership2,139,957 shares
Ownership 4.70%
Dimensional Fund Advisors Lp ownership in UCE / Ultra Clean Holdings, Inc.

2025-07-15 - Dimensional Fund Advisors Lp has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 2,139,957 shares of Ultra Clean Holdings, Inc. (DE:UCE). This represents 4.7 percent ownership of the company. In their previous filing dated 2025-04-15 , Dimensional Fund Advisors Lp had reported owning 2,262,519 shares, indicating a decrease of -5.42 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2025-07-15 2025-07-15 13G/A 2,262,519 2,139,957 -5.42 4.70 -6.00
2025-04-15 2025-04-15 13G/A 2,750,042 2,262,519 -17.73 5.00 -18.03
2024-02-09 2024-02-09 13G/A 2,301,761 2,750,042 19.48 6.10 19.61
2023-02-10 2023-02-10 13G 1,884,241 2,301,761 22.16 5.10 21.43
2022-02-08 2022-02-08 13G/A 2,157,392 1,884,241 -12.66 4.20 -20.75
2021-02-12 2021-02-12 13G/A 3,273,994 2,157,392 -34.11 5.30 -35.60
2020-02-12 2020-02-12 13G/A 3,092,097 3,273,994 5.88 8.23 3.78
2019-02-08 2019-02-08 13G/A 2,294,898 3,092,097 34.74 7.93 16.28
2018-02-09 2018-02-09 13G/A 2,291,277 2,294,898 0.16 6.82 -2.01
2017-02-09 2017-02-09 13G 2,291,277 6.96

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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)
2026-05-07 2026-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,011,778 -513,079 -33.65 62,892 62.83 0.0131
2026-02-12 2025-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,524,857 -417,757 -21.50 38,625 -27.03 0.0081
2025-11-12 2025-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,942,614 -197,343 -9.22 52,935 9.60 0.0114
2025-08-12 2025-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,139,957 -122,562 -5.42 48,300 -0.29 0.0112
2025-05-13 2025-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,262,519 -144,315 -6.00 48,441 -44.02 0.0120
2025-02-13 2024-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,406,834 77,307 3.32 86,526 -6.98 0.0208
2024-11-07 2024-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,329,527 -42,594 -1.80 93,019 -19.97 0.0226
2024-08-09 2024-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,372,121 -165,296 -6.51 116,231 -0.29 0.0304
2024-05-10 2024-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,537,417 -212,614 -7.73 116,569 24.16 0.0316
2024-02-07 2023-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,750,031 -5,162 -0.19 93,888 14.85 0.0274
2023-11-09 2023-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,755,193 41,988 1.55 81,746 -21.66 0.0268
2023-08-09 2023-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,713,205 112,769 4.34 104,350 21.02 0.0333
2023-05-12 2023-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,600,436 298,675 12.98 86,229 113,357.89 0.0290
2023-02-09 2022-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,301,761 195,177 9.27 76 -99.86 0.0225
2022-11-10 2022-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,106,584 4,469 0.21 54,247 -13.31 0.0208
2022-08-12 2022-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,102,115 203,586 10.72 62,579 -22.24 0.0224
2022-05-13 2022-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,898,529 14,339 0.76 80,480 -25.53 0.0248
2022-02-09 2021-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,884,190 -4,061 -0.22 108,077 34.36 0.0327
2021-11-12 2021-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,888,251 -38,603 -2.00 80,439 -22.29 0.0259
2021-08-12 2021-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,926,854 -48,018 -2.43 103,511 -9.69 0.0328
2021-05-14 2021-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,974,872 -182,520 -8.46 114,616 70.55 0.0379
2021-03-08 2020-12-31 13F/A-2 ULTRA CLEAN HLDGS COM 90385V107 2,157,392 -247,425 -10.29 67,204 30.22 0.0243
2021-02-11 2020-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,157,392 -247,425 67,204 24,270.5127
2020-11-12 2020-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,404,817 -280,274 -10.44 51,609 -15.06 0.0219
2020-08-13 2020-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,685,091 -384,827 -12.54 60,762 43.42 0.0267
2020-05-14 2020-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 3,069,918 -204,076 -6.23 42,366 -44.87 0.0221
2020-02-14 2019-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 3,273,994 -23,834 -0.72 76,841 59.21 0.0280
2019-11-12 2019-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 3,297,828 8,304 0.25 48,264 5.40 0.0188
2019-08-13 2019-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 3,289,524 44,333 1.37 45,790 36.33 0.0178
2019-08-12 2019-03-31 13F/A-2 ULTRA CLEAN HLDGS COM 90385V107 3,245,191 153,094 4.95 33,588 28.25 0.0134
2019-05-10 2019-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 3,245,191 153,094 33,588
2019-02-26 2018-12-31 13F/A-1 ULTRA CLEAN HLDGS COM 90385V107 3,092,097 -72,415 -2.29 26,190 -34.05 0.0119
2019-02-13 2018-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 3,092,097 -72,415 26,190
2018-11-13 2018-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 3,164,512 419,419 15.28 39,714 -12.85 0.0151
2018-08-10 2018-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,745,093 386,908 16.41 45,568 0.38 0.0182
2018-05-11 2018-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,358,185 63,287 2.76 45,395 -14.33 0.0189
2018-02-12 2017-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,294,898 -516,116 -18.36 52,986 -38.44 0.0220
2017-11-13 2017-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,811,014 -7,674 -0.27 86,073 62.86 0.0376
2017-08-11 2017-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 2,818,688 39,357 1.42 52,850 12.72 0.0244
2017-05-12 2017-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,779,331 488,054 21.30 46,886 110.95 0.0224
2017-02-09 2016-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 2,291,277 377,802 19.74 22,226 56.76 0.0111
2016-11-10 2016-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,913,475 82,203 4.49 14,178 36.07 0.0077
2016-08-09 2016-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,831,272 102,647 5.94 10,420 12.47 0.0060
2016-05-13 2016-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,728,625 148,125 9.37 9,265 14.50 0.0055
2016-02-10 2015-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,580,500 231,825 17.19 8,092 4.53 0.0050
2015-11-13 2015-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,348,675 74,548 5.85 7,741 -2.48 0.0051
2015-08-14 2015-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,274,127 33,794 2.72 7,938 -10.50 0.0049
2015-05-14 2015-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,240,333 110,076 9.74 8,869 -15.44 0.0056
2015-02-06 2014-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 1,130,257 89,804 8.63 10,489 12.64 0.0069
2014-11-13 2014-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,040,453 7,855 0.76 9,312 -0.34 0.0066
2014-08-08 2014-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 1,032,598 179,729 21.07 9,344 -16.68 0.0065
2014-05-14 2014-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 852,869 81,126 10.51 11,214 44.88 0.0084
2014-02-12 2013-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 771,743 72,891 10.43 7,740 60.28 0.0060
2013-11-13 2013-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 698,852 8,097 1.17 4,829 15.55 0.0042
2013-08-15 2013-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 690,755 690,755 4,179 0.0039
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.