Custom Truck One Source, Inc.
DE ˙ DB ˙ US23204X1037
SecurityDE:65W0 / Custom Truck One Source, Inc.
InstitutionBlackRock, Inc.
Latest Disclosed Ownership4,252,972 shares
Latest Disclosed Value $ 27,942,027
BlackRock, Inc. reports 1.39% decrease in ownership of 65W0 / Custom Truck One Source, Inc.

On May 13, 2026 - BlackRock, Inc. filed a 13F-HR form disclosing ownership of 4,252,972 shares of Custom Truck One Source, Inc. (DE:65W0) valued at $27,942,027 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 4,312,778 shares of Custom Truck One Source, Inc.. This represents a change in shares of -1.39% during the quarter.

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)
2026-05-13 2026-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 4,252,972 -59,806 -1.39 27,942 12.48 0.0000
2026-02-12 2025-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 4,312,778 75,080 1.77 24,842 -8.69 0.0004
2025-11-12 2025-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 4,237,698 52,367 1.25 27,206 31.59 0.0005
2025-08-12 2025-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 4,185,331 527,079 14.41 20,676 33.93 0.0004
2025-05-02 2025-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,658,252 -25,905 -0.70 15,438 -12.88 0.0003
2025-02-07 2024-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,684,157 -118,143 -3.11 17,721 35.09 0.0004
2024-11-13 2024-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,802,300 62,411 1.67 13,118 -19.37 0.0003
2024-08-13 2024-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,739,889 -70,685 -1.85 16,269 -26.64 0.0004
2024-05-10 2024-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,810,574 -125,253 -3.18 22,178 -8.82 0.0005
2024-02-13 2023-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,935,827 260,648 7.09 24,323 6.75 0.0006
2023-11-13 2023-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,675,179 28,854 0.79 22,786 -7.28 0.0007
2023-08-11 2023-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,646,325 -46,909 -1.27 24,576 -2.00 0.0007
2023-05-12 2023-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,693,234 -28,881 -0.78 25,077 6.61 0.0007
2023-02-13 2022-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,722,115 83,225 2.29 23,524 10.88 0.0007
2022-11-14 2022-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,638,890 180,652 5.22 21,214 9.53 0.0007
2022-08-12 2022-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,458,238 120,753 3.62 19,368 -30.83 0.0006
2022-05-12 2022-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 3,337,485 412,937 14.12 28,002 19.68 0.0008
2022-02-10 2021-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 2,924,548 71,556 2.51 23,397 -12.10 0.0006
2021-11-09 2021-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 2,852,992 2,109,383 283.67 26,619 276.03 0.0007
2021-08-11 2021-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 743,609 38,288 5.43 7,079 7.36 0.0002
2021-05-07 2021-03-31 13F NESCO HLDGS COM 64083J104 705,321 48,994 7.46 6,594 36.30 0.0002
2021-02-05 2020-12-31 13F NESCO HLDGS COM 64083J104 656,327 -7,493 -1.13 4,838 75.61 0.0002
2020-11-06 2020-09-30 13F NESCO HLDGS COM 64083J104 663,820 2,650 0.40 2,755 3.65 0.0001
2020-08-14 2020-06-30 13F NESCO HLDGS COM 64083J104 661,170 585,074 768.86 2,658 963.20 0.0001
2020-05-01 2020-03-31 13F NESCO HLDGS COM 64083J104 76,096 5,700 8.10 250 -13.49 0.0000
2020-02-13 2019-12-31 13F NESCO HLDGS COM 64083J104 70,396 1,290 1.87 289 -30.02 0.0000
2019-11-08 2019-09-30 13F NESCO HLDGS COM 64083J104 69,106 69,106 413 0.0000
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.