Stephen Mawer

Chairman at

ClimeCo LLC

Net worth: 11 M $ as of 2026-05-30

61 year

31 connections

Energy Minerals

Finance

Consumer Services

Profile

Stephen Patrick Mawer is currently Chairman at Calumet Specialty Products Partners LP since 2023, Chairman at ClimeCo LLC since 2017, Chairman at Calumet, Inc. since 2024, Director at Howard Midstream Energy Partners LLC since 2023, and Director at Zenith Energy Management LLC since 2014.
Former roles include Chairman at Calumet GP LLC from 2023 to 2024, President & Director at Koch Supply & Trading Co. Ltd. from 2000 to 2014, and President at KS&T International Holdings LP.
Education includes undergraduate and graduate degrees from the University of Cambridge.

Known holdings in public companies

Company	Date	Number of shares	Valuation	Valuation date
0.35%	2026-06-01	303,310 ( 0.35% )	11 M $	2026-05-30

Stephen Mawer active positions

Companies	Position	Start
Zenith Energy Management LLC Zenith Energy Management LLC Other TransportationTransportation Provides storage and logistics services for crude oil & refined products	Director/Board Member	2014-10-31
Calumet Specialty Products Partners LP Calumet Specialty Products Partners LP Oil Refining/MarketingEnergy Minerals Produces specialty hydrocarbon and fuel products	Chairman	2022-04-30
ClimeCo LLC ClimeCo LLC Investment ManagersFinance ClimeCo invests in companies located in the United States. The firm focuses on carbon offsets, plastic credits, Renewable Energy Credits (RECs), Forecasted Mitigation Units (FMUs), criteria air pollutants and water quality credits. It provides financing for buyout transactions.	Chairman	2017-06-30
Howard Midstream Energy Partners LLC Howard Midstream Energy Partners LLC Oil & Gas ProductionEnergy Minerals Engages in gathering, processing and transportation of natural gas	Director/Board Member	2023-04-03

All active positions of Stephen Mawer

Former positions of Stephen Mawer

Companies	Position	End
Calumet GP LLC Calumet GP LLC Financial ConglomeratesFinance Provides investment services	Chief Executive Officer	2022-04-30
Koch Supply & Trading Co. Ltd. Koch Supply & Trading Co. Ltd. Gas DistributorsUtilities Supplies natural gas, power and emissions for trading markets	President	2014-05-06
KS&T International Holdings LP KS&T International Holdings LP Oilfield Services/EquipmentIndustrial Services Produces & supplies petroleum products	President	-

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Training of Stephen Mawer

Experiences
Positions held

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Private companies

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Connections

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Members of the board

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Linked companies

Private companies	8
Calumet Specialty Products Partners LP Calumet Specialty Products Partners LP Oil Refining/MarketingEnergy Minerals Produces specialty hydrocarbon and fuel products	Energy Minerals
University of Cambridge University of Cambridge Other Consumer ServicesConsumer Services Functions as a College/University	Consumer Services
KS&T International Holdings LP KS&T International Holdings LP Oilfield Services/EquipmentIndustrial Services Produces & supplies petroleum products	Industrial Services
Calumet GP LLC Calumet GP LLC Financial ConglomeratesFinance Provides investment services	Finance
Koch Supply & Trading Co. Ltd. Koch Supply & Trading Co. Ltd. Gas DistributorsUtilities Supplies natural gas, power and emissions for trading markets	Utilities
ClimeCo LLC ClimeCo LLC Investment ManagersFinance ClimeCo invests in companies located in the United States. The firm focuses on carbon offsets, plastic credits, Renewable Energy Credits (RECs), Forecasted Mitigation Units (FMUs), criteria air pollutants and water quality credits. It provides financing for buyout transactions.	Finance
Howard Midstream Energy Partners LLC Howard Midstream Energy Partners LLC Oil & Gas ProductionEnergy Minerals Engages in gathering, processing and transportation of natural gas	Energy Minerals
Zenith Energy Management LLC Zenith Energy Management LLC Other TransportationTransportation Provides storage and logistics services for crude oil & refined products	Transportation