Star Bulk Carriers Corp.
Star Bulk Carriers Corp. (SBLK) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · SBLK · as of Mar 31, 2025
Ownership Breakdown
205
Institutional Holders
▼ 32 vs Q4
$565.85M
Total Inst. Value
▼ $4.88M vs Q4
111.53M
Shares Outstanding
freeFloat 78.88%
36.61M
13F Shares Held
▼ 1.57M vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
SBLK largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
OAKTREE CAPITAL MANAGEMENT LP deep sea foreign transportation of freight | 5.37M | 4.57% | 4.57% | $83.61B | May 15, 2025 | — held |
UBS GROUP AG deep sea foreign transportation of freight | 2.85M | 2.43% | 2.43% | $44.42B | May 13, 2025 | ▲ 2.38M |
RENAISSANCE TECHNOLOGIES LLC deep sea foreign transportation of freight | 1.89M | 1.61% | 1.61% | $29.39B | May 14, 2025 | ▲ 132.3K |
AMUNDI deep sea foreign transportation of freight | 1.87M | 1.59% | 1.59% | $26.55B | May 15, 2025 | ▲ 693.7K |
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP deep sea foreign transportation of freight | 1.64M | 1.40% | 1.40% | $25.57B | May 14, 2025 | ▼ 1.15M |
AMERIPRISE FINANCIAL INC deep sea foreign transportation of freight | 1.52M | 1.29% | 1.29% | $23.66B | May 14, 2025 | ▲ 1.50M |
PHILOSOPHY CAPITAL MANAGEMENT LLC deep sea foreign transportation of freight | 1.52M | 1.29% | 1.29% | $23.64B | May 15, 2025 | ▲ 139.9K |
BLACKROCK, INC. deep sea foreign transportation of freight | 1.39M | 1.18% | 1.18% | $21.59B | May 2, 2025 | ▲ 744.0K |
BANK OF AMERICA CORP /DE/ deep sea foreign transportation of freight | 1.31M | 1.11% | 1.11% | $20.32B | May 15, 2025 | ▲ 1.10M |
UBS ASSET MANAGEMENT AMERICAS INC deep sea foreign transportation of freight | 1.30M | 1.10% | 1.10% | $20.20B | May 19, 2025 | ▲ 485.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
29
Increased
+10.46M shares4
New Positions
first time holders14
Decreased
−4.36M shares0
Sold Out
fully exitedNet shares change (top 50)
+6.09M
+10.46M / −4.36M
Net new holders
+19
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
SBLK insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
8
Sell transactions
0.13
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Reskos Nikolaos Chief Operating Officer | Jun 1, 2026 | Sale | 5,000 | $28.49 | $142.4K | 362.8K | Form 4 ↗ |
Reskos Nikolaos Chief Operating Officer | May 20, 2026 | Sale | 9,914 | $26.55 | $263.2K | 397.8K | Form 4 ↗ |
Reskos Nikolaos Chief Operating Officer | May 21, 2026 | Sale | 30,000 | $27.29 | $818.7K | 367.8K | Form 4 ↗ |
Reskos Nikolaos Chief Operating Officer | May 18, 2026 | Sale | 33,103 | $26.28 | $869.9K | 407.8K | Form 4 ↗ |
Reskos Nikolaos Chief Operating Officer | May 19, 2026 | Sale | 86 | $26.49 | $2.3K | 407.7K | Form 4 ↗ |
Plakantonaki Charis Chief Strategy Officer | Apr 8, 2026 | Sale | 16,500 | $24.56 | $405.2K | 60.2K | Form 4 ↗ |
Reskos Nikolaos COO | Apr 14, 2026 | Sale | 1,594 | $25.00 | $39.9K | 449.3K | Form 4 ↗ |
Reskos Nikolaos COO | Apr 15, 2026 | Sale | 8,406 | $25.05 | $210.6K | 440.9K | Form 4 ↗ |
Plakantonaki Charis Chief Strategy Officer | Apr 8, 2026 | Sale | 16,500 | $24.56 | $405.2K | 60.2K | Form 4 ↗ |
Zagari Raffaele director | Mar 31, 2026 | Sale | 11,500 | $22.75 | $261.7K | 20.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Star Bulk Carriers Corp. (SBLK) is primarily owned by institutional investors, who hold approximately 32.8% of total shares outstanding. Company insiders own approximately 21.12%, while retail and public investors account for the remaining 46.05%.
The largest institutional shareholder of Star Bulk Carriers Corp. is OAKTREE CAPITAL MANAGEMENT LP, holding approximately 5.37 million shares — equal to 4.57% of outstanding shares — as of March 31, 2025.
A total of 205 institutional investors currently hold SBLK stock, with a combined institutional value of approximately $565,850,813 as of the most recent 13F filing period.
Frequently asked questions
SBLK ownershipStar Bulk Carriers Corp. (SBLK) is primarily owned by institutional investors, who hold approximately 32.8% of shares. The largest shareholder is OAKTREE CAPITAL MANAGEMENT LP with a 4.57% stake. Company insiders hold 21.12%. Data sourced from SEC Form 13F as of March 31, 2025.