SAN FRANCISCO — Buster Posey has executed his first true shakeup as the Giants’ president of baseball operations.

The Giants announced a flurry of roster moves on Wednesday morning, the headliner being the decision to designate first baseman LaMonte Wade Jr. for assignment.

Additionally, San Francisco designated backup catcher Sam Huff for assignment and optioned infielder Christian Koss to Triple-A Sacramento. To fill their three roster spots, the team signed first baseman Dominic Smith to a major-league contract and selected outfielder Daniel Johnson and catcher Andrew Knizner from Sacramento.

Posey expressed faith in Wade when he spoke to beat reporters Tuesday before the Giants’ 3-2, 10-inning loss to the Padres , but acknowledged outside options.

“From my vantage point now,

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