09:19 AM EDT, 08/26/2025 (MT Newswires) -- Post Holdings ( POST ) was Smart Insider's stock pick of the week after the company's Chairman William Stiritz purchased $3.9 million worth of company shares for $109.53 apiece on Aug. 19, raising his ownership by 1%.

The chairman also bought $20.4 million worth of company shares in a private purchase at $109 per share in June, Smart Insider said in a Tuesday note, adding that the $20.4 million purchase was from four grantor retained annuity trusts in which he had no beneficial interest.

It is "interesting" to see that the chairman purchased shares again two months after his $20.4 million stock buy in June, the note said, adding that his recent stock buy in August is the first open market purchase since February 2019.

Stiritz's record as a purchaser in this stock is almost "flawless" and he qualifies to be a "Smart Buyer," the note said.

Smart Insider ranked the stock +1, or strong positive signal, on Aug. 22.