Dorman Products, Inc.
US ˙ NasdaqGS ˙ US2582781009

SecurityDORM / Dorman Products, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership638 shares
Latest Disclosed Value $ 66,577
Advisor Group Holdings, Inc. reports 29.15% increase in ownership of DORM / Dorman Products, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 638 shares of Dorman Products, Inc. (US:DORM) valued at $66,582 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 494 shares of Dorman Products, Inc.. This represents a change in shares of 29.15% during the quarter. The current value of the position is $79,590 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 DORMAN PRODS COM 258278100 638 144 29.15 67 10.00 0.0001
2026-02-17 2025-12-31 13F DORMAN PRODS COM 258278100 494 -22,414 -97.84 61 -98.32 0.0001
2025-11-14 2025-09-30 13F DORMAN PRODS COM 258278100 22,908 17,182 300.07 3,572 416.79 0.0050
2025-09-04 2025-06-30 13F/A-1 ORMAN PRODS COM 258278100 5,726 5,267 1,147.49 691 1,156.36 0.0012
2025-08-13 2025-06-30 13F ORMAN PRODS COM 258278100 5,719 5,260 692 0.0008
2025-05-12 2025-03-31 13F DORMAN PRODS COM 258278100 459 -840 -64.67 55 -67.26 0.0001
2025-06-06 2024-12-31 13F/A-1 DORMAN PRODS COM 258278100 1,299 175 15.57 168 32.28 0.0004
2025-02-07 2024-12-31 13F DORMAN PRODS COM 258278100 1,754 630 217 0.0006
2024-11-13 2024-09-30 13F DORMAN PRODS COM 258278100 1,124 649 136.63 127 195.35 0.0003
2024-08-13 2024-06-30 13F DORMAN PRODS COM 258278100 475 199 72.10 43 65.38 0.0001
2024-05-10 2024-03-31 13F DORMAN PRODS COM 258278100 276 -3,775 -93.19 27 -92.28 0.0001
2024-02-12 2023-12-31 13F DORMAN PRODS COM 258278100 4,051 -2,251 -35.72 338 -29.35 0.0006
2023-11-13 2023-09-30 13F DORMAN PRODS COM 258278100 6,302 1,583 33.55 477 28.57 0.0007
2023-08-21 2023-06-30 13F/A-1 DORMAN PRODS COM 258278100 4,719 -232 -4.69 372 -12.91 0.0007
2023-08-10 2023-06-30 13F DORMAN PRODS COM 258278100 4,719 -232 372 0.0001
2023-05-12 2023-03-31 13F DORMAN PRODS COM 258278100 4,951 147 3.06 427 9.51 0.0008
2023-02-10 2022-12-31 13F DORMAN PRODS COM 258278100 4,804 -685 -12.48 389 -13.75 0.0008
2022-11-14 2022-09-30 13F DORMAN PRODS COM 258278100 5,489 -230 -4.02 451 -28.07 0.0010
2022-08-10 2022-06-30 13F DORMAN PRODS COM 258278100 5,719 660 13.05 627 30.90 0.0014
2022-05-04 2022-03-31 13F DORMAN PRODS COM 258278100 5,059 16 0.32 479 -16.11 0.0009
2022-02-03 2021-12-31 13F DORMAN PRODS COM 258278100 5,043 642 14.59 571 37.26 0.0011
2021-11-05 2021-09-30 13F DORMAN PRODS COM 258278100 4,401 187 4.44 416 -4.81 0.0009
2021-08-02 2021-06-30 13F DORMAN PRODS COM 258278100 4,214 -475 -10.13 437 -9.34 0.0009
2021-05-13 2021-03-31 13F DORMAN PRODS COM 258278100 4,689 306 6.98 482 26.51 0.0012
2021-02-10 2020-12-31 13F DORMAN PRODS COM 258278100 4,383 -399 -8.34 381 -11.81 0.0010
2020-11-12 2020-09-30 13F DORMAN PRODUCTS COM 258278100 4,782 105 2.25 432 38.02 0.0013
2020-08-14 2020-06-30 13F DORMAN PRODUCTS COM 258278100 4,677 -1,223 -20.73 313 -3.99 0.0011
2020-05-18 2020-03-31 13F DORMAN PRODUCTS COM 258278100 5,900 5,900 326 0.0013
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.