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David Cornhill
Founder at
ALTAGAS LTD.
Net worth: 61 M $ as of 29/09/2025
Profile
David Wallace Cornhill is a businessperson who founded AltaGas Ltd. and AltaGas Income Trust and who has been the head of 9 different companies. He holds the position of Chairman for AltaGas Utility Group, Inc. He is also on the board of Imperial Oil Ltd., AltaGas Ltd. (former Chairman) and Richard Ivey School of Business and Member-Governor Board at the University of Western Ontario and Member of Institute of Corporate Directors. In his past career David Wallace Cornhill was President & Chief Executive Officer for Southern Gas Co. (Illinois), Chairman & Chief Executive Officer at AltaGas Income Trust, Chairman & Chief Executive Officer at AltaGas Services, Inc., Chairman, President & Chief Executive Officer for Altagas General Partner, Inc., Chairman at TriSummit Utilities, Inc., President & Chief Executive Officer of Alberta & Southern Gas Co. Ltd. and Chief Executive Officer of AltaGas Ltd. Mr. Cornhill received an undergraduate degree from the University of Western Ontario and an MBA from Richard Ivey School of Business.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
ALTAGAS LTD. 0.52% | 21/06/2026 | 1,629,873 ( 0.52% ) | 60 M $ | 29/06/2026 |
| 29/09/2025 | 20,000 ( 0.3% ) | 359 300 $ | 29/09/2025 | |
IMPERIAL OIL LIMITED -.--% | 30/03/2026 | 0 ( -.--% ) | - $ | 29/06/2026 |
David Cornhill active positions
| Companies | Position | Start |
|---|---|---|
| ALTAGAS LTD. | Founder | 31/03/1994 |
| TRISUMMIT UTILITIES INC. | Chairman | - |
University of Western Ontario
 University of Western Ontario Other Consumer ServicesConsumer Services Functions as a College/University | Corporate Officer/Principal | - |
Richard Ivey School of Business
 Richard Ivey School of Business Other Consumer ServicesConsumer Services Functions as a College/University | Director/Board Member | - |
Institute of Corporate Directors
 Institute of Corporate Directors Miscellaneous Commercial ServicesCommercial Services Promotes governance and develops leadership skills | Corporate Officer/Principal | - |
Former positions of David Cornhill
| Companies | Position | End |
|---|---|---|
| IMPERIAL OIL LIMITED | Director/Board Member | 03/05/2026 |
| ALTERRA POWER CORP | Director/Board Member | 31/12/2017 |
| PAINTED PONY ENERGY LTD. | Director/Board Member | 31/12/2016 |
AltaGas Services, Inc.
 AltaGas Services, Inc. Gas DistributorsUtilities Produces and markets natural gas and electrical power | Chief Executive Officer | 31/12/2015 |
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Training of David Cornhill
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
48
1st degree connections
19
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 19 |
|---|---|
Imperial Oil Ltd.
 Imperial Oil Ltd. Integrated OilEnergy Minerals Engages in exploration, production, manufacturing and sale of crude oil, natural gas, petroleum products & petrochemicals | Energy Minerals |
AltaGas Income Trust
 AltaGas Income Trust Investment Trusts/Mutual FundsMiscellaneous Closed-End Investment Fund/Investment Trust | Miscellaneous |
Taylor NGL LP
 Taylor NGL LP Oil & Gas ProductionEnergy Minerals Explores, produces, and develops oil and gas properties | Energy Minerals |
TriSummit Utility Group, Inc.
 TriSummit Utility Group, Inc. Gas DistributorsUtilities Provides natural gas distribution services | Utilities |
Painted Pony Energy Ltd.
 Painted Pony Energy Ltd. Integrated OilEnergy Minerals Engages in development and production of natural gas resources | Energy Minerals |
Magma Energy Corp.
 Magma Energy Corp. Alternative Power GenerationUtilities Explores, develops and operates geothermal energy projects | Utilities |
Alberta & Southern Gas Co. Ltd.
 Alberta & Southern Gas Co. Ltd. Electric UtilitiesUtilities Natural gas utility | Utilities |
University of Western Ontario
University of Western Ontario Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
AltaGas Services, Inc.
AltaGas Services, Inc. Gas DistributorsUtilities Produces and markets natural gas and electrical power | Utilities |
Altagas General Partner, Inc.
 Altagas General Partner, Inc. Investment Trusts/Mutual FundsMiscellaneous Part of AltaGas Ltd., Altagas General Partner, Inc. is a Canadian company. | Miscellaneous |
Institute of Corporate Directors
Institute of Corporate Directors Miscellaneous Commercial ServicesCommercial Services Promotes governance and develops leadership skills | Commercial Services |
AltaGas Ltd. /Old/
 AltaGas Ltd. /Old/ Electric UtilitiesUtilities Generates and transmits coal based power | Utilities |
Taylor Gas Liquids Ltd.
 Taylor Gas Liquids Ltd. Taylor Gas Liquids Ltd. is a Calgary-based private company that was formed in 2016 with an investment from CPP Investments to acquire and develop midstream infrastructure and opportunities in Canada. Backed by the Pension Plan Investment Board, Taylor Gas Liquids Ltd. is dedicated to developing innovative midstream solutions and transforming the future of carbon reduction through the development of world-scale CO2 infrastructure in Canada. The company operates Wolf Pipeline, Wolf Carbon, and Wolf NGL, and is changing the midstream landscape with its commitment to health, safety, and the environment. Taylor Gas Liquids Ltd. offers 24-hour emergency toll-free services for its pipelines and carbon services. | |
Southern Gas Co. (Illinois)
 Southern Gas Co. (Illinois) Gas DistributorsUtilities Provides fuel dealership services | Utilities |
AltaGas Ltd.
 AltaGas Ltd. Gas DistributorsUtilities Provides natural gas distribution services | Utilities |
Alterra Power Corp.
 Alterra Power Corp. Electric UtilitiesUtilities Operates as a renewable power company that produces hydro, wind and solar electricity | Utilities |
Richard Ivey School of Business
Richard Ivey School of Business Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Northern Power Systems Corp.
 Northern Power Systems Corp. Electrical ProductsProducer Manufacturing Designs, manufactures and services next-generation permanent magnet direct-drive wind turbines for the distributed wind market | Producer Manufacturing |
TriSummit Utilities, Inc.
 TriSummit Utilities, Inc. Gas DistributorsUtilities Generates hydroelectric power and provides natural gas distribution services | Utilities |
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