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Rubico Inc.

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Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Rubico Inc.

CIK 0001943421RUBI· quarter ending 2026-06-30
Shares outstanding
485,501
as of 2025-12-31 · 20-F cover page, filed 2026-03-23
Held by 13F filers
38,289
across share classes — see % per class below
Holders
3
+3 vs 2026-03-31 · 3 new, 0 exited
Value
$207K
shares +— vs prior quarter

Share classes (cover page of the 20-F filed 2026-03-23, as of 2025-12-31)

ClassListedShares outstandingHeld by 13F filers% of classHoldersCUSIP
Common stock—385,501——
Series DPreferred Stock—100,000——
Not matched to a class38,289—Y1250N131

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine
CountCUSIPClass (as filers write it)HoldersShares heldClass shares% of classValueOptionsMapped via
Y1250N131COM NEW338,289——$207K—prefixholders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 4 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (3 of 3 · Y1250N131)

change vs 2026-03-31
#FilerShares% of classValueChange
1Cable Car Capital, LP30,000—$163KNEW
2UBS Group AG8,211—$45KNEW
3ROYAL BANK OF CANADA78—$0NEW

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting personFormFiledEventShares% of class
Trillium Trading, LLCSCHEDULE 13G/A2026-06-122026-06-1100%
L1 Capital Global Opportunities Master Fund, Ltd.SCHEDULE 13G/A2026-02-172025-12-3100%
Arena Special Opportunities Parallel Investor Vehicle III GP, LLCSCHEDULE 13G/A2026-02-132025-12-3100%
Arena Special Opportunities Fund (Offshore) GP, LLCSCHEDULE 13G/A2026-02-132025-12-3100%
Arena Special Opportunities Fund (Offshore) II GP, LPSCHEDULE 13G/A2026-02-132025-12-3100%
Arena Special Opportunities (Offshore) Master, LPSCHEDULE 13G/A2026-02-132025-12-3100%
Arena Special Opportunities Parallel Investor Vehicle III US, LPSCHEDULE 13G/A2026-02-132025-12-3100%
Arena Special Opportunities Partners III GP, LLCSCHEDULE 13G/A2026-02-132025-12-3100%
Arena Special Opportunities Partners III, LPSCHEDULE 13G/A2026-02-132025-12-3100%
Arena Investors, LPSCHEDULE 13G/A2026-02-132025-12-3100%
Arena Investors GP, LLCSCHEDULE 13G/A2026-02-132025-12-3100%
3 Sororibus TrustSCHEDULE 13D/A2025-11-172025-11-121,465,3593.32%
Evangelos J. PistiolisSCHEDULE 13D/A2025-11-172025-11-12220,5640.5%
Family Trading Inc.SCHEDULE 13D/A2025-11-172025-11-121,465,3593.32%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.