Custom Truck One Source, Inc.
DE ˙ DB ˙ US23204X1037
SecurityDE:65W0 / Custom Truck One Source, Inc.
InstitutionJane Street Group, Llc
Latest Disclosed Ownership660,534 shares
Latest Disclosed Value $ 4,339,708
Jane Street Group, Llc ownership in 65W0 / Custom Truck One Source, Inc.

On May 12, 2026 - Jane Street Group, Llc filed a 13F-HR form disclosing ownership of 660,534 shares of Custom Truck One Source, Inc. (DE:65W0) valued at $4,339,708 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 345,009 shares of Custom Truck One Source, Inc.. This represents a change in shares of 91.45% during the quarter.

Jane Street Group, Llc has a history of taking positions in derivatives of the underlying security (65W0) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

DE:65W0 / Custom Truck One Source, Inc. Historical Put/Call Ratio
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)
2026-05-12 2026-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 660,534 315,525 91.45 4,340 118.37 0.0003
2026-02-12 2025-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 345,009 345,009 1,987 0.0003
2025-11-14 2025-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 0 -11,830 -100.00 0 -100.00
2025-08-14 2025-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 11,830 11,830 58 0.0000
2025-05-19 2025-03-31 13F/A-1 CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 0 -12,278 -100.00 0 -100.00
2025-05-14 2025-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 0 0
2025-02-14 2024-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 12,278 -77,154 -86.27 59 -80.84 0.0000
2024-11-15 2024-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 89,432 4,155 4.87 309 -16.76 0.0001
2024-08-15 2024-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 85,277 74,696 705.94 371 506.56 0.0001
2024-05-16 2024-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 10,581 -16,892 -61.49 62 -63.91 0.0000
2024-02-15 2023-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 27,473 6,128 28.71 170 28.03 0.0000
2023-11-15 2023-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 21,345 -11,506 -35.02 132 -40.27 0.0000
2023-08-14 2023-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 32,851 18,280 125.45 221 125.51 0.0001
2023-05-16 2023-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 14,571 14,571 99 0.0000
2023-02-15 2022-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 0 -46,655 -100.00 0 -100.00
2022-11-15 2022-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 46,655 46,655 272 0.0001
2022-08-16 2022-06-30 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 0 -11,657 -100.00 0 -100.00
2022-05-17 2022-03-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 11,657 -11,029 -48.62 98 -45.86 0.0000
2022-02-15 2021-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A 23204X103 22,686 22,686 181 0.0001
2021-08-16 2021-06-30 13F NESCO HLDGS COM 64083J104 0 -20,332 -100.00 0 -100.00
2021-05-18 2021-03-31 13F NESCO HLDGS COM 64083J104 20,332 7,354 56.67 190 97.92 0.0001
2021-02-17 2020-12-31 13F NESCO HLDGS COM 64083J104 12,978 2,061 18.88 96 113.33 0.0000
2020-11-17 2020-09-30 13F NESCO HLDGS COM 64083J104 10,917 -13,602 -55.48 45 -54.08 0.0000
2020-08-17 2020-06-30 13F NESCO HLDGS COM 64083J104 24,519 24,519 98 0.0001
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-02-12 2025-12-31 13F CUSTOM TRUCK ONE SOURCE COM CL A Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-11-14 2025-09-30 13F CUSTOM TRUCK ONE SOURCE COM CL A Call 25,000 160 n/a n/a n/a
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.