David Mullen

Founder at SHELF DRILLING, LTD.

Net worth: 495 387 $ as of 31/05/2026

68 year

76 connections

Industrial Services

Consumer Services

Transportation

Profile

David J.
Mullen is the founder of Shelf Drilling Ltd., founded in 2012, where the title held is Executive Chairman.
Current jobs include Chief Executive Officer at Shelf Drilling International Holdings Ltd. and Shelf Drilling Holdings Ltd., Chairman & Chief Executive Officer at Shelf Drilling (North Sea) Ltd. since 2014, Senior Independent Director at Subsea 7 SA and Subsea 7 SA (Luxembourg) since 2021, and MD & Director-Geco Prakla Personnel Unit at Schlumberger Nigeria Ltd. Former jobs include Chief Executive Officer at Wellstream Holdings Ltd. from 2010 to 2011, Chief Executive Officer at Ocean Rig ASA from 2008 to 2010, Director at Sea1 Offshore, Inc., Principal at SLB Ltd., Senior VP-Global Marketing & Business Development at Transocean, Inc. from 2005 to 2008, SVP-Global Marketing & Business Development at Transocean Ltd., and President-South & North America at Schlumberger Oilfield Services, Inc. from 2001 to 2004.
Education includes undergraduate studies at Trinity College Dublin and graduate studies at the National University of Ireland.

Known holdings in public companies

Company	Date	Number of shares	Valuation	Valuation date
SUBSEA 7 S.A. 0.01%	31/12/2025	15,000 ( 0.01% )	495 387 $	31/05/2026

David Mullen active positions

Companies	Position	Start
SHELF DRILLING, LTD.	Founder	14/08/2012
SUBSEA 7 S.A.	Director/Board Member	17/04/2018
SHELF DRILLING (NORTH SEA), LTD.	Chief Executive Officer	06/10/2022
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	01/01/2021

All active positions of David Mullen

Former positions of David Mullen

Companies	Position	End
Wellstream Holdings Ltd. Wellstream Holdings Ltd. Oil & Gas PipelinesIndustrial Services Designs and manufactures of bespoke flexible pipeline products	Chief Executive Officer	01/04/2011
Ocean Rig ASA Ocean Rig ASA Contract DrillingIndustrial Services Owns and operates drilling rigs	Chief Executive Officer	07/08/2010
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Training of David Mullen

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Linked companies

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