SBLK at a glance
Star Bulk Carriers Corp (SBLK, SEC CIK 1386716) filed Form 4 insider filings as recently as September 22, 2026. SignalX summarizes each filing with AI and tracks the company's insider trades and institutional holders.
- As of June 30, 2026, 22 institutional investment managers tracked by SignalX reported holding Star Bulk Carriers Corp (SBLK) shares worth $415.7 million in 13F-HR filings.
- The most recent insider open-market sale reported on Form 4 was by Vrettou Eleni on September 21, 2026 of 3,500 shares at $32.12 per share.
- In the last 90 days, SBLK insiders reported 9 open-market purchases ($6.9M) and 8 open-market sales ($4.5M) on Form 4, a net purchase of $2.5M.
Source: SEC EDGAR (XBRL financial data, 13F-HR and Form 4 filings).
- Insiders · 90 days
- 9 buys · 8 sells
- Net +$2.5M
- 13F holders
- 22 funds
- $415.7M · −1 vs prior quarter
SignalX for SBLK
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Recent Insider Transactions (Form 4)
Latest reported trades by officers, directors and 10% owners
| Insider | Type | Date | Shares | Price |
|---|---|---|---|---|
| Vrettou Eleni | Sell | Sep 21, 2026 | 3,500 | $32.12 |
| Balakrishnan Mahesh | Sell | Sep 18, 2026 | 10,000 | $32.34 |
| Zagari Raffaele | Buy | Sep 15, 2026 | 50,000 | $28.27 |
| Plakantonaki Charis | Buy | Sep 15, 2026 | 3,000 | $28.27 |
| Erhardt Koert | Buy | Sep 15, 2026 | 6,000 | $28.27 |
| Karellis Nikolaos | Buy | Sep 15, 2026 | 2,000 | $28.27 |
| Reskos Nikolaos | Buy | Sep 15, 2026 | 10,000 | $28.27 |
| Spyrou Symeon | Buy | Sep 15, 2026 | 15,000 | $28.27 |
13F Fund Holdings: Quarterly Trend
Latest: Q2 2026Aggregate SBLK share value held by 13F filers tracked by SignalX, by quarter.
Quarterly totals table
| Quarter | Funds | Total value |
|---|---|---|
| Q2 2026 | 22 | $415.7M |
| Q1 2026 | 23 | $319.2M |
| Q4 2025 | 22 | $193.7M |
| Q3 2025 | 23 | $196.0M |
| Q2 2025 | 20 | $140.6M |
| Q1 2025 | 22 | $121.9M |
| Q4 2024 | 17 | $91.9M |
| Q3 2024 | 16 | $168.0M |
- BlackRock+2.22M (+369%)
- Marex Group plc+602.0K (+478%)
- Two Sigma Investments+517.1K (+17%)
- Citigroup+282.9K (+2296%)
- Goldman Sachs Group+276.4K (+16%)
- D.E. Shaw & Co−582.6K (-50%)
- Morgan Stanley−494.5K (-32%)
- Millennium Management−246.7K (-34%)
- Bank of America Corp−189.3K (-33%)
- Vanguard Portfolio Management LLC−12.4K (-4%)
- Mangrove Partners−26.9K
Source: 13F-HR filings on SEC EDGAR (aggregated from 165 fund-quarter rows). Reflects only 13F filers tracked by SignalX, not the full institutional ownership universe. How 13F filings work
Latest 2026 SEC Filings: 10-K, 10-Q, 8-K & Form 4
| Form | Filing date | Period | Analysis | SEC |
|---|---|---|---|---|
| 4 | Sep 22, 2026 | - | - | - |
| 4 | Sep 22, 2026 | - | - | - |
| 6-K | Sep 18, 2026 | - | - | - |
| 4 | Sep 17, 2026 | - | - | - |
| 4 | Sep 17, 2026 | - | - | - |
| 4 | Sep 17, 2026 | - | - | - |
| 4 | Sep 17, 2026 | - | - | - |
| 4 | Sep 17, 2026 | - | - | - |
| 4 | Sep 16, 2026 | - | - | - |
| 4 | Sep 16, 2026 | - | - | - |
| 4 | Sep 16, 2026 | - | - | - |
| 6-K | Sep 16, 2026 | - | - | - |
| 6-K | Sep 15, 2026 | - | - | - |
| 6-K | Sep 11, 2026 | - | - | - |
| 6-K | Sep 8, 2026 | - | - | - |
| 6-K | Sep 4, 2026 | - | - | - |
| 6-K | Sep 4, 2026 | - | - | - |
| 4 | Aug 26, 2026 | - | - | - |
| 4 | Aug 25, 2026 | - | - | - |
| 4 | Aug 19, 2026 | - | - | - |
| 4 | Aug 18, 2026 | - | - | - |
| 6-K | Aug 11, 2026 | - | - | - |
| 4 | Aug 10, 2026 | - | - | - |
| 4 | Aug 7, 2026 | - | - | - |
| 6-K | Aug 7, 2026 | - | - | - |
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SBLK SEC filings: frequently asked questions
Are SBLK insiders buying or selling?
In the last 90 days, Star Bulk Carriers Corp (SBLK) officers, directors and 10% owners reported 9 open-market purchases worth $6.9 million by 8 insiders and 8 open-market sales worth $4.5 million by 5 insiders on Form 4, a net purchase of $2.5 million. Many insider sales are pre-planned or for taxes, so purchases usually carry more information.
Which institutions hold SBLK stock?
As of June 30, 2026, the largest Star Bulk Carriers Corp (SBLK) holders among the 13F filers tracked by SignalX were Two Sigma Investments ($88.1 million), BlackRock ($70.3 million), Renaissance Technologies LLC ($52.4 million), Goldman Sachs Group ($50.3 million), Morgan Stanley ($26.0 million). 13F-HR reports are filed up to 45 days after each quarter ends.
What are the latest SBLK SEC filings?
Star Bulk Carriers Corp (SBLK) filed a Form 4 insider filing on September 22, 2026.
What is SBLK's SEC CIK number?
Star Bulk Carriers Corp (SBLK)'s SEC Central Index Key (CIK) is 1386716. EDGAR lists every SBLK filing under that number.
Ask anything about SBLK
The research agent reads SBLK's filings, financials, insider trades and 13F holders, then answers with sources.