Buster Posey had a charming little habit as a hitter when he questioned an umpire’s call. Posey, who retired last fall after a dozen sterling seasons for the San Francisco Giants, was too polite to turn and mouth off. He telegraphed his opinion with a slow, subtle movement of his head and, perhaps, a pained smile. An umpire attuned to subtext would get the message.

Posey gave respect and got it in return, traits that should help in his new post-career role in the Giants’ ownership group. The team will announce Wednesday that Posey, 35, has bought into the team and will serve on its board of directors.

“I want to be viewed as, like, pro-baseball,” Posey said this week by phone from his home in Georgia. “I’m not pro-player, I’m not pro-owner, I just love the game of baseball, and this is another opportunity for me to learn more about the game, more about the business and really commit my time to an organization in a city that I’ve grown to love.”

Posey joins a group of 30 partners with stakes in the Giants. The team did not reveal Posey’s share, but Posey’s slice is almost certainly very small. He earned most of his money with an eight-year, $159 million contract to close his career, and Forbes recently valued the Giants at $3.5 billion, the fifth highest club valuation in Major League Baseball.

“He’s putting his real money in at that high value,” said Greg Johnson, the Giants’ chairman, “which I think shows his commitment to the organization and his belief in baseball in general.”

Johnson spoke by phone from Luxembourg; he is also chairman of Franklin Resources, Inc., the investment management company. Johnson scaled back his role there when he became the Giants’ control person in November 2019, and learned early on about Posey’s brand of nice-guy honesty.