Matthew J. Mainer

CIK: 0001954094

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)2 (7.4%)

Derivative conversions

Awards (A)7 (25.9%)

Compensation grants

Other (G, F, J, C, D, …)18 (66.7%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

POST

Post Holdings, Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (27 total)

POST
Post Holdings, Inc.
Oct 22, 2026
Tax Payment(F)
Direct
7.9K shares at avg. $78.06$620K
POST
Post Holdings, Inc.
Oct 22, 2026
Award(A)
Direct
18K shares-
POST
Post Holdings, Inc.
Dec 4, 2025
Gift(G)
Direct
600 shares-
POST
Post Holdings, Inc.
Dec 1, 2025
Tax Payment(F)
Direct
269 shares at avg. $104.03$28K
POST
Post Holdings, Inc.
Nov 18, 2025
Award(A)
Direct
17.3K shares-
POST
Post Holdings, Inc.
Nov 18, 2025
Award(A)
Direct
8.1K shares-
POST
Post Holdings, Inc.
Nov 15, 2025
Tax Payment(F)
Direct
937 shares at avg. $106.70$100K
POST
Post Holdings, Inc.
Nov 14, 2025
Tax Payment(F)
Direct
1.2K shares at avg. $106.34$133K
POST
Post Holdings, Inc.
Nov 12, 2025
Exercise(M)
Direct
6K shares-
POST
Post Holdings, Inc.
Nov 12, 2025
Tax Payment(F)
Direct
2.6K shares at avg. $106.02$281K
POST
Post Holdings, Inc.
Nov 12, 2025
Exercise(M)
Direct
3.9K shares-
POST
Post Holdings, Inc.
Nov 12, 2025
Tax Payment(F)
Direct
1.7K shares at avg. $106.02$183K
POST
Post Holdings, Inc.
Oct 22, 2025
Tax Payment(F)
Direct
7.3K shares at avg. $107.19$783K
POST
Post Holdings, Inc.
Oct 22, 2025
Award(A)
Direct
16.6K shares-
POST
Post Holdings, Inc.
Dec 5, 2024
Gift(G)
Direct
500 shares-
POST
Post Holdings, Inc.
Dec 1, 2024
Tax Payment(F)
Direct
359 shares at avg. $120.48$43K
POST
Post Holdings, Inc.
Dec 1, 2024
Tax Payment(F)
Direct
2K shares at avg. $120.48$247K
POST
Post Holdings, Inc.
Dec 1, 2024
Tax Payment(F)
Direct
269 shares at avg. $120.48$32K
POST
Post Holdings, Inc.
Nov 20, 2024
Tax Payment(F)
Direct
623 shares at avg. $110.31$69K
POST
Post Holdings, Inc.
Nov 15, 2024
Tax Payment(F)
Direct
940 shares at avg. $107.78$101K
POST
Post Holdings, Inc.
Nov 14, 2024
Tax Payment(F)
Direct
1.3K shares at avg. $109.47$137K
POST
Post Holdings, Inc.
Nov 14, 2024
Tax Payment(F)
Direct
1.1K shares at avg. $109.47$116K
POST
Post Holdings, Inc.
Nov 14, 2024
Tax Payment(F)
Direct
2.4K shares at avg. $109.47$263K
POST
Post Holdings, Inc.
Nov 13, 2024
Award(A)
Restricted Stock Units
Direct
6K shares-
POST
Post Holdings, Inc.
Nov 13, 2024
Award(A)
Restricted Stock Units
Direct
11.7K shares-

		Type	Shares	Price		Ownership
Oct 22, 2026	POST Post Holdings, Inc.	Tax Payment(F)	7,940	$78.06	$619,796	Direct
Oct 22, 2026	POST Post Holdings, Inc.	Award(A)	18,024	-	$0	Direct
Dec 4, 2025	POST Post Holdings, Inc.	Gift(G)	600	-	-	Direct
Dec 1, 2025	POST Post Holdings, Inc.	Tax Payment(F)	269	$104.03	$27,984	Direct
Nov 18, 2025	POST Post Holdings, Inc.	Award(A)	17,338	-	-	Direct
Nov 18, 2025	POST Post Holdings, Inc.	Award(A)	8,123	-	-	Direct
Nov 15, 2025	POST Post Holdings, Inc.	Tax Payment(F)	937	$106.70	$99,978	Direct
Nov 14, 2025	POST Post Holdings, Inc.	Tax Payment(F)	1,249	$106.34	$132,819	Direct
Nov 12, 2025	POST Post Holdings, Inc.	Exercise(M)	6,008	-	-	Direct
Nov 12, 2025	POST Post Holdings, Inc.	Tax Payment(F)	2,647	$106.02	$280,635	Direct
Nov 12, 2025	POST Post Holdings, Inc.	Exercise(M)	3,916	-	-	Direct
Nov 12, 2025	POST Post Holdings, Inc.	Tax Payment(F)	1,725	$106.02	$182,885	Direct
Oct 22, 2025	POST Post Holdings, Inc.	Tax Payment(F)	7,308	$107.19	$783,345	Direct
Oct 22, 2025	POST Post Holdings, Inc.	Award(A)	16,588	-	-	Direct
Dec 5, 2024	POST Post Holdings, Inc.	Gift(G)	500	-	$0	Direct
Dec 1, 2024	POST Post Holdings, Inc.	Tax Payment(F)	359	$120.48	$43,252	Direct
Dec 1, 2024	POST Post Holdings, Inc.	Tax Payment(F)	2,047	$120.48	$246,623	Direct
Dec 1, 2024	POST Post Holdings, Inc.	Tax Payment(F)	269	$120.48	$32,409	Direct
Nov 20, 2024	POST Post Holdings, Inc.	Tax Payment(F)	623	$110.31	$68,723	Direct
Nov 15, 2024	POST Post Holdings, Inc.	Tax Payment(F)	940	$107.78	$101,313	Direct
Nov 14, 2024	POST Post Holdings, Inc.	Tax Payment(F)	1,252	$109.47	$137,056	Direct
Nov 14, 2024	POST Post Holdings, Inc.	Tax Payment(F)	1,064	$109.47	$116,476	Direct
Nov 14, 2024	POST Post Holdings, Inc.	Tax Payment(F)	2,404	$109.47	$263,166	Direct
Nov 13, 2024	POST Post Holdings, Inc.	Award(A) Restricted Stock Units	6,008	-	-	Direct
Nov 13, 2024	POST Post Holdings, Inc.	Award(A) Restricted Stock Units	11,749	-	-	Direct

1-25 of 27 transactions

About MAINER MATTHEW J

MAINER MATTHEW J (SEC CIK 0001954094) files insider reports with the SEC as EVP, CFO & TREASURER of Post Holdings, Inc. (POST).

Signal8 holds 13 ownership filings by MAINER MATTHEW J, all Form 4s, filed between Oct 23, 2024 and Oct 26, 2026. Those filings report 27 transactions, from Oct 21, 2024 to Oct 22, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on MAINER MATTHEW J's filings is in ST. LOUIS, MO.

Recent filings by MAINER MATTHEW J

Oct 22, 2026: Tax withholding of POST shares (Form 4, code F).
Oct 22, 2026: Grant or award of POST shares (Form 4, code A).
Dec 4, 2025: Gift of POST shares (Form 4, code G).
Dec 1, 2025: Tax withholding of POST shares (Form 4, code F).
Nov 18, 2025: Grants or awards of POST shares (2 lines, Form 4, code A).