Rubico Inc.
RUBI- Exchange
- Nasdaq
- Industry
- Water Transportation
- SEC CIK
- 0001943421
No open-market purchases or sales by Rubico Inc. insiders were filed in the last 90 days; 3 institutions reported holding it in 13F filings for Q2 2026, worth $207.5K in total; no superinvestor holds it.
Holders of 5% or more of RUBI
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Rubico Inc., largest stake first. The change is against the holder's previous filing.
No holder currently reports owning 5% or more of Rubico Inc. on Schedule 13D or 13G.
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
11 Schedule 13D and 13G filings on Rubico Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Jun 12, 20268:42 AM ET | Trillium Trading, LLC | 13G/A | 0.00%0 shares | −5.40 ppfrom 5.40%Below 5% | Jun 11, 2026 | SEC |
| Jun 11, 202610:58 AM ET | Trillium Trading, LLC | 13G | 5.40%175.0K shares | New | Jun 10, 2026 | SEC |
| Feb 17, 20268:00 AM ET | L1 Capital Global Opportunities Master Fund, Ltd. | 13G/A | 0.00%0 shares | −9.99 ppfrom 9.99%Below 5% | Dec 31, 2025 | SEC |
| Feb 13, 202612:58 PM ET | Arena Investors LPand 8 others | 13G/A | 0.00%0 shares | −8.10 ppfrom 8.10%Below 5% | Dec 31, 2025 | SEC |
| Nov 17, 20254:16 PM ET | Family Trading Inc.and 2 others | 13D/A | 3.32%1.47M shares | −2.59 ppfrom 5.91%Below 5% | Nov 12, 2025 | SEC |
| Nov 14, 20254:41 PM ET | Arena Investors LPand 8 others | 13G | 8.10%1.55M shares | New | Nov 6, 2025 | SEC |
| Nov 13, 20254:10 PM ET | L1 Capital Global Opportunities Master Fund, Ltd. | 13G | 9.99%1.76M shares | New | Nov 6, 2025 | SEC |
| Nov 12, 20254:36 PM ET | Family Trading Inc.and 2 others | 13D/A | 5.91%1.47M shares | −1.54 ppfrom 7.45% | Nov 7, 2025 | SEC |
| Nov 7, 20254:43 PM ET | Family Trading Inc.and 2 others | 13D/A | 7.45%1.47M shares | −38.30 ppfrom 45.75% | Nov 5, 2025 | SEC |
| Oct 16, 20254:30 PM ET | Family Trading Inc.and 2 others | 13D/A | 45.75%1.47M shares | −1.05 ppfrom 46.80% | Oct 15, 2025 | SEC |
| Aug 8, 20254:19 PM ET | Family Trading Inc.and 2 others | 13D | 46.80%1.47M shares | New | Aug 1, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Rubico Inc. shares.
No Form 144 notices for Rubico Inc. are on file.