The Padres went big-game hunting again.

San Diego shockingly acquired 100-mph flamethrower Mason Miller from the A’s on Thursday in a massive move ahead of the MLB trade deadline, the teams announced.

San Diego is also receiving former Yankee lefty JP Sears, while the A’s are acquiring four players, including the No. 3 prospect in the sport in touted shortstop Leo De Vries.

The Post’s Joel Sherman mentioned Wednesday how Miller, who is under control through 2029, represented one of the most intriguing options available at the deadline.

“The expectation with this group is always to go win a ring, go win a championship,” Padres GM A.J. Preller said Thursday. “That’s the goal.”

There were questions about whether the A’s would pull the trigger, though, but closers are bringing in massive hauls this deadline and they joined in on the fun.

Padres president of baseball operations A.J. Preller is perhaps the most aggressive executive in baseball and he continued that trend with this trade, adding a massive piece to an already formidable Padres bullpen that shut down the Mets in a three-game sweep that wrapped up Wednesday.

Miller, 26, gives the Padres a dominant righty who can tally strikeouts with the best of them.

He is known for his electric four-seam fastball which averages an MLB-best 101.1 mph, per Baseball Savant, and he hit 104.1 mph earlier this year.

Miller has struck out 201 batters in 136 2/3 career innings, including 59 in 38 1/3 innings this year. He’s 3-6 with a 3.76 ERA sand 20 saves this season.

He made his first All-Star team last season and finished fourth in the Rookie of the Year voting while tallying 28 saves and accumulating 104 strikeouts in 65 innings.

The trade situation intensified Wednesday night when the A’s held him out of a save situation in the ninth inning of their 5-4 win over the Mariners.

A’s manager Mark Kotsay did not offer much on the reason for withholding Miller, adding to the intrigue.

“Mason was unavailable tonight and that’s all I can say,” Kotsay said.

Sherman reported the A’s wanted a top-25 prospect and they received one in De Vries, with three other pitchers included in the package.

De Vries is an 18-year-old who owns a .767 OPS in Class-A, while the other three prospects are righty pitchers Braden Nett, Henry Báez and Eduarniel Nuñez.

Nett ranked second in the Padres’ system, Baez 13th and Nunez 17th, per MLB.com.

“A switch-hitter, De Vries already shows an exquisite knowledge of the zone and will take his walks like he’s a player many years older,” MLB.com said in its writeup.

Sears, who is 7-9 with a 4.95 ERA, provides insurance depth and could possibly slot into the five should the Padres opt to move Cease.

All told, the Padres had a very busy deadline day and also acquired: Ryan O’Hearn, Ramón Laureano, Freddy Fermin, Nestor Cortes, Will Wagner and Jorge Quintana.

Despite rumors, the team did not trade away Dylan Cease.