卡斯特海事公司

SecurityCTRM / Castor Maritime Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership73,869 shares
Latest Disclosed Value $ 136,658
Renaissance Technologies Llc reports 82.08% increase in ownership of CTRM / Castor Maritime Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 73,869 shares of Castor Maritime Inc. (US:CTRM) valued at $136,658 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 40,569 shares of Castor Maritime Inc.. This represents a change in shares of 82.08% during the quarter. The current value of the position is $166,205 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)
2026-05-14 2026-03-31 13F CASTOR MARITIME SHS Y1146L208 73,869 33,300 82.08 137 63.86 0.0002
2026-02-12 2025-12-31 13F CASTOR MARITIME SHS Y1146L208 40,569 -2,100 -4.92 84 -5.68 0.0001
2025-11-13 2025-09-30 13F CASTOR MARITIME SHS Y1146L208 42,669 2,000 4.92 89 2.33 0.0001
2025-08-13 2025-06-30 13F CASTOR MARITIME SHS Y1146L208 40,669 1,000 2.52 87 -4.44 0.0001
2025-05-14 2025-03-31 13F CASTOR MARITIME SHS Y1146L208 39,669 0 0.00 90 -17.43 0.0001
2025-02-13 2024-12-31 13F CASTOR MARITIME SHS Y1146L208 39,669 3,300 9.07 109 -28.76 0.0002
2024-11-13 2024-09-30 13F CASTOR MARITIME SHS Y1146L208 36,369 6,900 23.41 153 13.33 0.0002
2024-08-09 2024-06-30 13F CASTOR MARITIME SHS Y1146L208 29,469 8,400 39.87 136 0.0002
2024-05-13 2024-03-31 13F CASTOR MARITIME SHS Y1146L208 21,069 21,069 0 0.0001
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.