Dorman 제품, Inc.
US ˙ NasdaqGS ˙ US2582781009

SecurityDORM / Dorman Products, Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership42,200 shares
Latest Disclosed Value $ 4,403,992
Renaissance Technologies Llc reports 54.08% decrease in ownership of DORM / Dorman Products, Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 42,200 shares of Dorman Products, Inc. (US:DORM) valued at $4,403,992 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 91,900 shares of Dorman Products, Inc.. This represents a change in shares of -54.08% during the quarter. The current value of the position is $5,360,666 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)
2026-05-14 2026-03-31 13F DORMAN PRODS COM 258278100 42,200 -49,700 -54.08 4,404 -61.11 0.0069
2026-02-12 2025-12-31 13F DORMAN PRODS COM 258278100 91,900 4,500 5.15 11,321 -16.90 0.0176
2025-11-13 2025-09-30 13F DORMAN PRODS COM 258278100 87,400 -18,700 -17.62 13,624 4.67 0.0180
2025-08-13 2025-06-30 13F DORMAN PRODS COM 258278100 106,100 21,900 26.01 13,015 28.24 0.0173
2025-05-14 2025-03-31 13F DORMAN PRODS COM 258278100 84,200 55,100 189.35 10,149 169.28 0.0154
2025-02-13 2024-12-31 13F DORMAN PRODS COM 258278100 29,100 400 1.39 3,770 16.11 0.0056
2024-11-13 2024-09-30 13F DORMAN PRODS COM 258278100 28,700 3,500 13.89 3,247 40.82 0.0049
2024-08-09 2024-06-30 13F DORMAN PRODS COM 258278100 25,200 5,000 24.75 2,305 230,400.00 0.0039
2024-05-13 2024-03-31 13F DORMAN PRODS COM 258278100 20,200 20,200 2 0.0031
2024-02-13 2023-12-31 13F DORMAN PRODS COM 258278100 0 -15,800 -100.00 0 -100.00
2023-11-14 2023-09-30 13F DORMAN PRODS COM 258278100 15,800 -7,800 -33.05 1 0.00 0.0020
2023-08-11 2023-06-30 13F DORMAN PRODS COM 258278100 23,600 -14,300 -37.73 2 -66.67 0.0027
2023-05-12 2023-03-31 13F DORMAN PRODS COM 258278100 37,900 -19,100 -33.51 3 -25.00 0.0043
2023-02-13 2022-12-31 13F DORMAN PRODS COM 258278100 57,000 -83,800 -59.52 5 -99.97 0.0063
2022-11-14 2022-09-30 13F DORMAN PRODS COM 258278100 140,800 55,400 64.87 11,562 23.41 0.0164
2022-08-12 2022-06-30 13F DORMAN PRODS COM 258278100 85,400 60,200 238.89 9,369 291.19 0.0111
2022-05-13 2022-03-31 13F DORMAN PRODS COM 258278100 25,200 21,820 645.56 2,395 526.96 0.0028
2022-02-11 2021-12-31 13F DORMAN PRODS COM 258278100 3,380 -9,320 -73.39 382 -68.22 0.0005
2021-11-12 2021-09-30 13F DORMAN PRODS COM 258278100 12,700 -16,800 -56.95 1,202 -60.69 0.0016
2021-08-13 2021-06-30 13F DORMAN PRODS COM 258278100 29,500 -26,800 -47.60 3,058 -47.08 0.0038
2021-05-13 2021-03-31 13F DORMAN PRODS COM 258278100 56,300 21,200 60.40 5,779 89.66 0.0072
2021-02-10 2020-12-31 13F DORMAN PRODS COM 258278100 35,100 29,300 505.17 3,047 481.49 0.0033
2020-11-13 2020-09-30 13F DORMAN PRODUCTS COM 258278100 5,800 5,800 524 0.0005
2018-05-14 2018-03-31 13F DORMAN PRODUCTS COM 258278100 0 -75,100 -100.00 0 -100.00
2018-02-13 2017-12-31 13F DORMAN PRODUCTS COM 258278100 75,100 75,100 4,592 0.0051
2015-02-13 2014-12-31 13F DORMAN PRODUCTS COM 258278100 0 -226,600 -100.00 0 -100.00
2014-11-12 2014-09-30 13F DORMAN PRODUCTS COM 258278100 226,600 20,200 9.79 9,078 -10.83 0.0249
2014-08-13 2014-06-30 13F DORMAN PRODUCTS COM 258278100 206,400 171,373 489.26 10,180 392.03 0.0237
2014-05-14 2014-03-31 13F DORMAN PRODUCTS COM 258278100 35,027 -28,873 -45.18 2,069 -42.22 0.0050
2014-02-14 2013-12-31 13F DORMAN PRODUCTS COM 258278100 63,900 33,800 112.29 3,581 140.17 0.0086
2013-11-13 2013-09-30 13F DORMAN PRODUCTS COM 258278100 30,100 30,100 1,491 0.0036
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.