![Matthew Mainer](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Matthew Mainer
Director of Finance/CFO at
POST HOLDINGS, INC.
Net worth: 7 M $ as of 2026-05-30
Profile
Matthew J.
Mainer is Chief Financial Officer, Treasurer & Executive VP at Post Holdings, Inc. since 2024, with employment at the firm starting in 2015.
Former roles include Director at 8th Avenue Food & Provisions, Inc. from 2018 to 2025; Treasurer & Vice President at ESCO Technologies, Inc. from 2002 to 2012; Assistant Treasurer at Keenova Therapeutics Plc from 2013 to 2014; and Assistant Treasurer at Mallinckrodt Medical, Inc. (US).
Education includes an MBA from the University of Saint Louis and an undergraduate degree from the University of Missouri-St. Louis.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
POST HOLDINGS, INC. 0.16% | 2025-12-03 | 74,670 ( 0.16% ) | 7 M $ | 2026-05-30 |
Matthew Mainer active positions
| Companies | Position | Start |
|---|---|---|
| POST HOLDINGS, INC. | Director of Finance/CFO | 2022-11-30 |
Former positions of Matthew Mainer
| Companies | Position | End |
|---|---|---|
8th Avenue Food & Provisions, Inc.
 8th Avenue Food & Provisions, Inc. Food: Specialty/CandyConsumer Non-Durables Manufactures nut butters, granola, dried fruits, nuts and trail mix products & retails through online | Director/Board Member | 2024-12-31 |
| MALLINCKRODT PLC | Corporate Officer/Principal | 2014-11-30 |
| ESCO TECHNOLOGIES INC. | Treasurer | 2012-11-30 |
Mallinckrodt Medical, Inc. (US)
 Mallinckrodt Medical, Inc. (US) Pharmaceuticals: MajorHealth Technology Manufactures pharmaceutical products | Corporate Officer/Principal | - |
Training of Matthew Mainer
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
45
1st degree connections
7
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 7 |
|---|---|
ESCO Technologies, Inc.
 ESCO Technologies, Inc. Electronic Equipment/InstrumentsElectronic Technology Manufactures and supplies engineered filtration, fluid control products and integrated propulsion systems & diagnostic testing instruments | Electronic Technology |
8th Avenue Food & Provisions, Inc.
8th Avenue Food & Provisions, Inc. Food: Specialty/CandyConsumer Non-Durables Manufactures nut butters, granola, dried fruits, nuts and trail mix products & retails through online | Consumer Non-Durables |
Post Holdings, Inc.
 Post Holdings, Inc. Food: Specialty/CandyConsumer Non-Durables Manufactures markets and distributes branded ready-to-eat cereals | Consumer Non-Durables |
Keenova Therapeutics Plc
 Keenova Therapeutics Plc Pharmaceuticals: MajorHealth Technology Provides pharmaceutical products | Health Technology |
Mallinckrodt Medical, Inc. (US)
Mallinckrodt Medical, Inc. (US) Pharmaceuticals: MajorHealth Technology Manufactures pharmaceutical products | Health Technology |
University of Saint Louis
 University of Saint Louis Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
University of Missouri-St. Louis
 University of Missouri-St. Louis Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
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