Dorman Products, Inc.
US ˙ NasdaqGS ˙ US2582781009

SecurityDORM / Dorman Products, Inc.
InstitutionBoston Trust Walden Corp
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Boston Trust Walden Corp closes position in DORM / Dorman Products, Inc.

On January 28, 2026 - Boston Trust Walden Corp filed a 13F-HR form disclosing ownership of 0 shares of Dorman Products, Inc. (US:DORM) valued at $0 USD as of December 31, 2025. The entity filed a previous 13F-HR on October 17, 2025 disclosing 1,300 shares of Dorman Products, Inc.. The current value of the position is $0 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)
2026-01-28 2025-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 0 -100.00 0
2025-10-17 2025-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 1,300 1,300 203 0.0015
2022-10-19 2022-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 0 -2,440 -100.00 0 -100.00
2022-07-22 2022-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 2,440 0 0.00 268 15.52 0.0025
2022-04-20 2022-03-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 2,440 -405,884 -99.40 232 -99.50 0.0019
2022-01-21 2021-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 408,324 -721 -0.18 46,144 19.16 0.3705
2021-10-25 2021-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 409,045 3,863 0.95 38,724 -7.81 0.3429
2021-07-22 2021-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 405,182 1,313 0.33 42,005 1.33 0.3735
2021-04-21 2021-03-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 403,869 -27,643 -6.41 41,453 10.65 0.4014
2021-01-15 2020-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 431,512 65,296 17.83 37,464 13.19 0.3997
2020-10-14 2020-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 366,216 11,892 3.36 33,099 39.28 0.4122
2020-07-23 2020-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 354,324 16,559 4.90 23,764 27.29 0.3209
2020-04-24 2020-03-31 13F/A-1 DORMAN PRODUCTS COMMON STOCK 258278100 337,765 5,730 1.73 18,669 -25.75 0.2975
2020-04-21 2020-03-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 393,633 61,598 21,756 192,917.0466
2020-01-10 2019-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 332,035 9,084 2.81 25,142 -2.13 0.2926
2019-10-21 2019-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 322,951 17,853 5.85 25,688 -3.38 0.3229
2019-07-25 2019-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 305,098 -2,542 -0.83 26,586 -1.90 0.3460
2019-04-16 2019-03-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 307,640 -43,328 -12.35 27,100 -14.23 0.3690
2019-01-17 2018-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 350,968 -6,012 -1.68 31,595 15.06 0.5027
2018-10-23 2018-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 356,980 -10,006 -2.73 27,459 9.53 0.3783
2018-07-25 2018-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 366,986 3,020 0.83 25,069 4.03 0.3679
2018-04-13 2018-03-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 363,966 -12,635 -3.36 24,098 4.66 0.3656
2018-01-29 2017-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 376,601 -11,602 -2.99 23,025 -17.19 0.3375
2017-10-13 2017-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 388,203 -4,186 -1.07 27,803 -14.39 0.4329
2017-07-19 2017-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 392,389 -86,576 -18.08 32,478 -17.44 0.5219
2017-04-24 2017-03-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 478,965 -43,633 -8.35 39,338 3.03 0.6130
2017-02-07 2016-12-31 13F/A-1 DORMAN PRODUCTS COMMON STOCK 258278100 522,598 -12,416 -2.32 38,181 11.68 0.6019
2017-02-01 2016-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 522,598 38,181
2016-10-17 2016-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 535,014 -3,132 -0.58 34,187 11.06 0.5636
2016-08-09 2016-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 538,146 -5,307 -0.98 30,782 4.08 0.5257
2016-04-19 2016-03-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 543,453 -6,143 -1.12 29,575 13.36 0.5149
2016-01-21 2015-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 549,596 -169,794 -23.60 26,090 -28.74 0.4840
2015-10-29 2015-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 719,390 -23,879 -3.21 36,610 3.35 0.6115
2015-07-17 2015-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 743,269 -8,155 -1.09 35,424 -5.24 0.5402
2015-04-15 2015-03-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 751,424 751,424 0.00 37,384 0.5549
2015-01-28 2014-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 0 -798,410 -100.00 0 -100.00
2014-10-23 2014-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 798,410 -27,348 -3.31 31,984 -21.47 0.4939
2014-08-01 2014-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 825,758 -12,521 -1.49 40,727 -17.74 0.5919
2014-04-11 2014-03-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 838,279 -16,895 -1.98 49,509 3.31 0.7354
2014-02-11 2013-12-31 13F DORMAN PRODUCTS COMMON STOCK 258278100 855,174 59,345 7.46 47,925 21.53 0.6992
2013-11-15 2013-09-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 795,829 12,637 1.61 39,434 10.35 0.6034
2013-08-08 2013-06-30 13F DORMAN PRODUCTS COMMON STOCK 258278100 783,192 783,192 35,737 0.5770
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.