David Mullen
Net worth: 462 583 $ as of 2026-03-30
Net worth: 462 583 $ as of 2026-03-30
Mr. David J.
Mullen is a Senior Independent Director at Subsea 7 SA (Luxembourg), a Senior Independent Director at Subsea 7 SA, a Chairman & Chief Executive Officer at Shelf Drilling (North Sea) Ltd., an Executive Chairman at Shelf Drilling Ltd., a Chief Executive Officer at Shelf Drilling Holdings Ltd., a Chief Executive Officer at Shelf Drilling International Holdings Ltd. and a MD & Director-Geco Prakla Personnel Unit at Schlumberger Nigeria Ltd. He is on the Board of Directors at Subsea 7 SA (Luxembourg) and Subsea 7 SA. Mr. Mullen was previously employed as a Chief Executive Officer by Wellstream Holdings Plc, a Chief Executive Officer by Ocean Rig ASA, a Senior VP-Global Marketing & Business Development by Transocean, Inc. /Old/, a President-South & North America by Schlumberger Oilfield Services, Inc., a Principal by Schlumberger Ltd., and a SVP-Global Marketing & Business Development by Transocean Ltd. He also served on the board at Sea1 Offshore, Inc. He received his undergraduate degree from Trinity College Dublin and a graduate degree from National University of Ireland.
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
SUBSEA 7 S.A. 0.01% | 2025-12-30 | 15,000 ( 0.01% ) | 462 583 $ | 2026-03-30 |
| Companies | Position | Start |
|---|---|---|
| SHELF DRILLING, LTD. | Chairman | 2024-08-15 |
| SUBSEA 7 S.A. | Director/Board Member | 2018-04-16 |
| SHELF DRILLING (NORTH SEA), LTD. | Chief Executive Officer | 2022-10-05 |
Shelf Drilling Holdings Ltd.
Shelf Drilling Holdings Ltd. Contract DrillingIndustrial Services Provides shallow water drilling services to the oil and gas industry | Chief Executive Officer | - |
Schlumberger Nigeria Ltd.
Schlumberger Nigeria Ltd. Packaged SoftwareTechnology Services Develops technologies | Chief Executive Officer | - |
Shelf Drilling International Holdings Ltd.
Shelf Drilling International Holdings Ltd. Contract DrillingIndustrial Services Provides shallow water drilling services to the oil and gas industry | Chief Executive Officer | - |
Subsea 7 SA (Luxembourg)
Subsea 7 SA (Luxembourg) Engineering & ConstructionIndustrial Services Operates as a subsea engineering, construction and services company serving the offshore energy industry | Director/Board Member | 2020-12-31 |
| Companies | Position | End |
|---|---|---|
Wellstream Holdings Ltd.
Wellstream Holdings Ltd. Oil & Gas PipelinesIndustrial Services Designs and manufactures of bespoke flexible pipeline products | Chief Executive Officer | 2011-03-31 |
Ocean Rig ASA
Ocean Rig ASA Contract DrillingIndustrial Services Owns and operates drilling rigs | Chief Executive Officer | 2010-08-06 |
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Active
Inactive
Listed companies
Private companies
1st degree connections
1st degree companies
Male
Female
Members of the board
Executives
| Private companies | 16 |
|---|---|
Schlumberger Ltd.
Schlumberger Ltd. Contract DrillingIndustrial Services Designs and constructs wells and manufactures surface & midstream production systems | Industrial Services |
Transocean, Inc. /Old/
Transocean, Inc. /Old/ Contract DrillingIndustrial Services Provides offshore contract drilling services for oil and gas wells | Industrial Services |
Wellstream Holdings Ltd.
Wellstream Holdings Ltd. Oil & Gas PipelinesIndustrial Services Designs and manufactures of bespoke flexible pipeline products | Industrial Services |
Transocean Ltd.
Transocean Ltd. Contract DrillingIndustrial Services Provides offshore contract drilling services for oil and gas wells | Industrial Services |
Subsea 7 SA
Subsea 7 SA Oilfield Services/EquipmentIndustrial Services Provides engineering and construction services to the offshore drilling industry | Industrial Services |
Ocean Rig ASA
Ocean Rig ASA Contract DrillingIndustrial Services Owns and operates drilling rigs | Industrial Services |
Schlumberger Oilfield Services, Inc.
Schlumberger Oilfield Services, Inc. Oilfield Services/EquipmentIndustrial Services Provides oilfield exploration services | Industrial Services |
Trinity College Dublin
Trinity College Dublin Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
National University of Ireland
National University of Ireland Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Sea1 Offshore, Inc.
Sea1 Offshore, Inc. Marine ShippingTransportation Provides distribution services for oil and gas | Transportation |
Schlumberger Nigeria Ltd.
Schlumberger Nigeria Ltd. Packaged SoftwareTechnology Services Develops technologies | Technology Services |
Shelf Drilling International Holdings Ltd.
Shelf Drilling International Holdings Ltd. Contract DrillingIndustrial Services Provides shallow water drilling services to the oil and gas industry | Industrial Services |
Shelf Drilling Holdings Ltd.
Shelf Drilling Holdings Ltd. Contract DrillingIndustrial Services Provides shallow water drilling services to the oil and gas industry | Industrial Services |
Shelf Drilling Ltd.
Shelf Drilling Ltd. Contract DrillingIndustrial Services Provides shallow water drilling services to the oil and gas industry | Industrial Services |
Subsea 7 SA (Luxembourg)
Subsea 7 SA (Luxembourg) Engineering & ConstructionIndustrial Services Operates as a subsea engineering, construction and services company serving the offshore energy industry | Industrial Services |
Shelf Drilling (North Sea) Ltd.
Shelf Drilling (North Sea) Ltd. Contract DrillingIndustrial Services Operates as a shallow water offshore drilling contractor company | Industrial Services |
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