Comparable stake leader
Family Trading Inc.
SEC ownership of Rubico Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001943421.
Disclosed value leader
Family Trading Inc.
Comparable rows
1/3
Latest evidence
30 Jun 2026
- Public ticker
- RUBI on Nasdaq
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Family Trading Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
1 of 3
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Family Trading Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001943421
- Issuer location
- Athens
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Rubico Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Family Trading Inc.
Disclosed value leader
Family Trading Inc.
Comparable rows
1/3
Latest evidence
30 Jun 2026
13D/G
13F
Lead comparable stake: 3.3%
2 rows are not safely comparable across share classes.
13D/G row: Family Trading Inc.
Quick read
Family Trading Inc. leads the comparable SEC ownership view at 3.3%.
1 of 3 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Family Trading Inc.'s linked filing trail.
Comparable ownership
Top 1
Family Trading Inc.
3.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-3 of 3 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Family Trading Inc. |
13D/G
|
3.3%
|
$2,271,306
1,465,359 shares
|
$0 | 12 Nov 2025 |
| Cable Car Capital, LP |
13F
Company
|
—
class O/S missing
|
$162,900
30,000 shares
|
— | 30 Jun 2026 |
| UBS Group AG |
13F
Company
|
—
class O/S missing
|
$44,586
8,211 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$131,883.
Buys
$393,790
Insiders: 1
Sells
$525,673
Insiders: 1
Net
-$131,883
Shares: -66,057
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 484,963
Shares: 551,020
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 484,963 | 551,020 | $393,790 | $525,673 | -$131,883 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-6 of 6 reporting-owner rows connected to Rubico Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
6
Largest Forms 3/4/5 holder
HRT FINANCIAL LP
Net 12M change
-$131,883
Latest report
11 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| HRT FINANCIAL LP | 10%+ Owner | $0 | -$131,883 | -100% | Mixed | 11 Jun 2026 |
| Georgios Xiradakis | Director | Mixed | 18 Mar 2026 | |||
| Kalliopi Ornithopoulou | President, Chairwoman, and CEO, Director | Mixed | 18 Mar 2026 | |||
| Aristovoulos Christinis | Director | Mixed | 18 Mar 2026 | |||
| Nikolaos Papastratis | CFO, Secretary, Director | Mixed | 18 Mar 2026 | |||
| Georgios Daskalakis | Director | Mixed | 18 Mar 2026 |
Recent insider transactions for Rubico Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Hrt Financial Lp | RUBI | Common Stock | Sale | -100% | $525,673 | $0.9540 | -551,020 | 0 | 12 Jun 2026 | Direct |
| Hrt Financial Lp | RUBI | Common Stock | Purchase | $393,790 | $0.8120 | 484,963 | 384,941 | 11 Jun 2026 | Direct |
* marks a reported price that did not pass the local price check.