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John Kostoyannis
Director/Board Member at
STEALTHGAS INC.
Net worth: 471 358 $ as of 2026-05-30
Profile
John G.
Kostoyannis currently holds the positions of Independent Director at StealthGas, Inc. since 2010, Managing Director & Director at Allied Shipbrokinc, Inc. since 1991, Independent Director at Imperial Petroleum, Inc. since 2021, Independent Non-Executive Director at C3is, Inc. since 2023, and Member of the Hellenic Shipbrokers Association.
Mr. Kostoyannis completed undergraduate studies at London Guildhall University in 1988.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
STEALTHGAS INC. 0.11% | 2026-03-31 | 41,796 ( 0.11% ) | 383 687 $ | 2026-05-30 |
| 2026-04-14 | 15,969 ( 0.04% ) | 81 602 $ | 2026-05-30 | |
| 2026-04-14 | 235 ( 0.03% ) | 6 069 $ | 2026-05-30 |
John Kostoyannis active positions
| Companies | Position | Start |
|---|---|---|
| STEALTHGAS INC. | Director/Board Member | 2010-09-30 |
| IMPERIAL PETROLEUM INC. | Director/Board Member | 2021-10-31 |
| C3IS INC. | Director/Board Member | 2023-05-31 |
Allied Shipbrokinc, Inc.
 Allied Shipbrokinc, Inc. Marine ShippingTransportation Provides deep sea freight transportation services | Chief Executive Officer | - |
Hellenic Shipbrokers Association | Corporate Officer/Principal | - |
Training of John Kostoyannis
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
16
1st degree connections
6
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 6 |
|---|---|
StealthGas, Inc.
 StealthGas, Inc. Marine ShippingTransportation Provides seaborne transportation services to LPG producers and users | Transportation |
London Guildhall University
 London Guildhall University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Allied Shipbrokinc, Inc.
Allied Shipbrokinc, Inc. Marine ShippingTransportation Provides deep sea freight transportation services | Transportation |
Hellenic Shipbrokers Association | |
Imperial Petroleum, Inc.
 Imperial Petroleum, Inc. Marine ShippingTransportation Provides international seaborne transportation services to oil producers, refineries and commodities traders | Transportation |
C3is, Inc.
 C3is, Inc. Marine ShippingTransportation Provides international seaborne transportation services | Transportation |
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