SEC Form 4 · Updated Daily
GSTL
Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| Apollo Principal Holdings II, L.P. | 10%+ Owner | 10,240,593 | 2015-07-17 | J |
| TAVLARIOS JOHN P | 10%+ Owner | 8,862,429 | 2006-12-15 | J |
| Centerbridge Credit GP Investors, L.L.C. | Reporting Owner | 5,818,546 | 2015-07-17 | J |
| Centerbridge GP Investors II (Cayman), L.P. | 10%+ Owner | 5,818,546 | 2015-07-17 | J |
| Centerbridge Special GP Investors II (Cayman), L.P. | 10%+ Owner | 5,818,546 | 2015-07-17 | J |
| Centerbridge Credit Offshore GP Investors, L.L.C. | 10%+ Owner | 5,818,546 | 2015-07-17 | J |
| DIANA SHIPPING INC. | 10%+ Owner | 4,280,585 | 2026-09-01 | S |
| Aronson Jeffrey | Reporting Owner | 4,207,781 | 2022-08-09 | S |
| CCP II Cayman GP Ltd. | 10%+ Owner | 4,207,781 | 2022-08-09 | S |
| Centerbridge Capital Partners II (Cayman), L.P. | 10%+ Owner | 4,207,781 | 2022-08-09 | S |
| Centerbridge Associates II (Cayman), L.P. | 10%+ Owner | 4,207,781 | 2022-08-09 | S |
| Centerbridge Capital Partners SBS II (Cayman), L.P. | 10%+ Owner | 4,207,781 | 2022-08-09 | S |
| Apollo Management Holdings GP, LLC | 10%+ Owner | 4,148,015 | 2021-03-09 | S |
| Apollo Management Holdings, L.P. | 10%+ Owner | 4,148,015 | 2021-03-09 | S |
| Apollo Principal Holdings II GP, LLC | 10%+ Owner | 4,148,015 | 2021-03-09 | S |
| Apollo Capital Management GP, LLC | 10%+ Owner | 4,148,015 | 2021-03-09 | S |
| Apollo SVF Management GP, LLC | 10%+ Owner | 4,148,015 | 2021-03-09 | S |
| APOLLO SPECIAL OPPORTUNITIES MANAGED ACCOUNT LP | 10%+ Owner | 4,148,015 | 2021-03-09 | S |
| Apollo SVF Management, L.P. | 10%+ Owner | 4,148,015 | 2021-03-09 | S |
| Apollo Capital Management, L.P. | 10%+ Owner | 4,148,015 | 2021-03-09 | S |
| Ford B James | 10%+ Owner | 2,956,138 | 2007-10-05 | S |
| Strategic Value Partners, LLC | 10%+ Owner | 2,094,698 | 2021-01-08 | S |
| Khosla Victor | 10%+ Owner | 2,094,698 | 2021-01-08 | S |
| SVP Special Situations III-A LLC | 10%+ Owner | 2,094,698 | 2021-01-08 | S |
| SVP Special Situations III LLC | 10%+ Owner | 2,094,698 | 2021-01-08 | S |
| SVP Special Situations II LLC | 10%+ Owner | 2,094,698 | 2021-01-08 | S |
| GEORGIOPOULOS PETER C | 10%+ Owner | 1,664,013 | 2016-02-17 | A |
| Gallogly Mark T | Reporting Owner | 1,544,768 | 2018-02-02 | X |
| KAPLAN STEPHEN A | 10%+ Owner | 1,512,532 | 2008-05-28 | S |
| WOBENSMITH JOHN C | Director · Officer | 603,861 | 2026-02-23 | M |
| Centerbridge Special GP Investors II, L.L.C. | 10%+ Owner | 529,777 | 2015-07-17 | — |
| FLEET ACQUISITION LLC | 10%+ Owner | 443,606 | 2008-03-10 | J |
| Centerbridge Special Credit Partners General Partner II, L.P. | 10%+ Owner | 325,581 | 2021-08-12 | S |
| Centerbridge Special Credit Partners II, L.P. | 10%+ Owner | 325,581 | 2021-08-12 | S |
| CSCP II Cayman GP Ltd. | 10%+ Owner | 250,125 | 2021-08-16 | S |
| Centerbridge Special Credit Partners General Partner II (Cayman), L.P. | 10%+ Owner | 250,125 | 2021-08-16 | S |
| Centerbridge Special Credit Partners II AIV IV (Cayman), L.P. | 10%+ Owner | 250,125 | 2021-08-16 | S |
| Dolphin James G | Director | 155,006 | 2025-08-26 | M |
| Christensen Jesper | Officer | 116,749 | 2026-02-23 | M |
| REGAN ARTHUR L | Director | 104,414 | 2024-05-13 | S |
| Allen Peter George | Officer | 80,017 | 2026-02-23 | M |
| POLZIN MARK F | Director | 55,362 | 2013-05-16 | A |
| NORTH ROBERT C | Director | 55,362 | 2013-05-16 | A |
| Kramer Nathaniel | Director | 53,562 | 2013-05-16 | A |
| PERRIN HARRY A | Director | 52,162 | 2013-05-16 | A |
| Adamo Joseph | Officer | 44,859 | 2026-02-23 | M |
| Smith Alfred E. IV | Director | 38,662 | 2013-05-16 | A |
| Centerbridge Credit Partners Master, L.P. | Reporting Owner | 37,165 | 2021-08-17 | S |
| Centerbridge Credit Partners Offshore General Partner, L.P. | Reporting Owner | 37,165 | 2021-08-17 | S |
| Centerbridge Credit Cayman GP, Ltd. | Reporting Owner | 37,165 | 2021-08-17 | S |
| Centerbridge Credit Partners General Partner, L.P. | 10%+ Owner | 37,165 | 2021-08-17 | S |
| Centerbridge Credit Partners, L.P. | 10%+ Owner | 37,165 | 2021-08-17 | S |
| Zafolias Apostolos | Officer | 25,418 | 2023-02-25 | M |
| DAVIS EUGENE I | Director | 18,234 | 2017-05-17 | M |
| LEFFELL MICHAEL J | Director | 15,690 | 2016-02-17 | M |
| Ashby Ian | Director | 15,690 | 2016-02-17 | M |
| Das Paramita | Director | 9,554 | 2026-06-18 | M |
| Hughes Robert E | Officer | 7,464 | 2023-02-25 | M |
| MAVROLEON BASIL G | Director | 7,388 | 2015-07-17 | — |
| HAINES KATHLEEN C | Director | 0 | 2017-05-17 | — |
| Orsel Karin Y | Director | 0 | 2021-03-22 | — |
| Mahony Kevin | Director | 0 | 2015-09-16 | — |
| Han Daniel | Director | 0 | 2018-04-05 | — |
| MAJESKE CHRISTOPH O | Director | 0 | 2017-01-04 | — |
| Brantl John | Director | 0 | 2016-10-24 | — |
| Scheir Jason | Director | 0 | 2016-12-19 | — |
| Kirchof Peter | Director | 0 | 2016-02-17 | — |
| Baltic Trading Ltd | 10%+ Owner | 0 | 2015-04-07 | — |
| Truong Bao Dinh | Director | 0 | 2014-07-09 | — |
| BUCHANAN ROBERT GERALD | Officer | 0 | 2014-07-09 | J |
| Manuel William Pastam | Director | 0 | 2014-07-09 | — |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-09-02 | DIANA SHIPPING INC. | Open-market sale | 75,000 | $26.73 | 4,130,585 |
| 2026-09-02 | DIANA SHIPPING INC. | Open-market sale | 75,000 | $26.64 | 4,205,585 |
| 2026-09-01 | DIANA SHIPPING INC. | Open-market sale | 125,000 | $26.02 | 4,280,585 |
| 2026-08-28 | DIANA SHIPPING INC. | Open-market sale | 2,280 | $26.00 | 4,405,585 |
| 2026-08-27 | DIANA SHIPPING INC. | Open-market sale | 8,427 | $26.13 | 4,407,865 |
| 2026-08-25 | DIANA SHIPPING INC. | Open-market sale | 348,256 | $26.56 | 4,416,292 |
| 2026-08-25 | DIANA SHIPPING INC. | Open-market sale | 75,000 | $26.51 | 4,764,548 |
| 2026-08-25 | DIANA SHIPPING INC. | Open-market sale | 75,000 | $26.50 | 4,839,548 |
| 2026-08-25 | DIANA SHIPPING INC. | Open-market sale | 75,000 | $26.52 | 4,914,548 |
| 2026-08-25 | DIANA SHIPPING INC. | Open-market sale | 75,000 | $26.62 | 4,989,548 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 63.89 | $0.00 | 2,117.89 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 172.47 | $0.00 | 5,717.47 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 95.21 | $0.00 | 3,156.34 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 297.18 | $0.00 | 9,851.45 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 204.31 | $0.00 | 6,772.84 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 276.41 | $0.00 | 9,163.06 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 199.63 | $0.00 | 6,617.72 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 255.34 | $0.00 | 8,464.63 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 660.74 | $0.00 | 21,903.46 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 501.47 | $0.00 | 16,623.86 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 241.89 | $0.00 | 8,018.54 |
| 2026-08-24 | HAINES KATHLEEN C | Grant / award (derivative) | 427.17 | $0.00 | 14,160.63 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 172.47 | $0.00 | 5,717.47 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 297.18 | $0.00 | 9,851.45 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 204.31 | $0.00 | 6,772.84 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 276.41 | $0.00 | 9,163.06 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 199.63 | $0.00 | 6,617.72 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 255.34 | $0.00 | 8,464.63 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 660.74 | $0.00 | 21,903.46 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 501.47 | $0.00 | 16,623.86 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 241.89 | $0.00 | 8,018.54 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 427.17 | $0.00 | 14,160.63 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 847.62 | $0.00 | 28,098.73 |
| 2026-08-24 | MAVROLEON BASIL G | Grant / award (derivative) | 59.2 | $0.00 | 1,962.48 |
| 2026-08-24 | Das Paramita | Grant / award (derivative) | 172.47 | $0.00 | 5,717.47 |
| 2026-08-24 | Das Paramita | Grant / award (derivative) | 204.31 | $0.00 | 6,772.84 |
| 2026-08-24 | REGAN ARTHUR L | Grant / award (derivative) | 172.47 | $0.00 | 5,717.47 |
| 2026-08-24 | REGAN ARTHUR L | Grant / award (derivative) | 297.18 | $0.00 | 9,851.45 |
| 2026-08-24 | REGAN ARTHUR L | Grant / award (derivative) | 204.31 | $0.00 | 6,772.84 |
| 2026-08-24 | REGAN ARTHUR L | Grant / award (derivative) | 276.41 | $0.00 | 9,163.06 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.