Michelle Marie Atkinson

Insider

First SEC filing: March 16, 2026 · Latest: March 16, 2026

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 3 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

No open-market trades on record; showing all filings.

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
July 31, 2026	POST	A	122	$91.41	$11,152	536 Direct	+29.47%	Acquired	-13.5% (price as of 2026-08-21)
June 30, 2026	POST	A	126	$88.26	$11,121	415 Direct	+43.60%	Acquired	-10.5% (price as of 2026-08-21)
May 29, 2026	POST	A	121	$91.84	$11,113	289 Direct	+72.02%	Acquired	-13.9% (price as of 2026-08-21)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
July 31, 2026	POST	Post Holdings, Inc. Stock Equivalents	Common Stock (122)	—	—	122	Acquired
June 30, 2026	POST	Post Holdings, Inc. Stock Equivalents	Common Stock (126)	—	—	126	Acquired
May 29, 2026	POST	Post Holdings, Inc. Stock Equivalents	Common Stock (121)	—	—	121	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
March 16, 2026	POST	Common Stock	2,100	Indirect