Even the media world’s best dealmaker misses some great opportunities.

Liberty Media’s John Malone said Thursday that one of his biggest mistakes was not going hostile in 2012 to take over Netflix.

At the time, shares of the video streaming company were trading in the $8 to $13 per share range.

They closed Thursday at $108.92 — up 723 percent since Dec. 31, 2012.

Netflix’s market cap, meanwhile, has increased more than $40 billion.

“The biggest [mistake] in the last few years was not going hostile on Netflix when we identified it as being very undervalued,” the Liberty chairman said in a playful Q&A with Chief Executive Greg Maffei.

Maffei was asking Malone about his biggest mistakes during the company’s annual investor day.

Malone had reason to check his impulse to buy Netflix, Maffei told the SRO crowd. Liberty owned premium cable channel Starz at the time, and its success depended on carriage agreements with cable operators.

“The cable guys hated Netflix, and they would have whipped us at Starz,” Maffei said.

Liberty spun off Starz a year later. Yet a Netflix deal then could have cast Malone — cable’s public face for decades — as a traitor.

Maffei couldn’t helping wondering if it might have been worth it, saying, “We could have flushed Starz, with all due respect, and look what we would have made on it.”

Malone said a second mistake involved saving Sirius from bankruptcy in 2009 by throwing it a $530 million lifeline for an equivalent of a 40 percent stake.

The deal also allowed Liberty to up its Sirius stake to 51 percent for $1.25 a share.

But then Malone started talking up Sirius’ prospects, sending it to $1.50 share.

At the time, Malone didn’t want to go the extra 25 cents, so he held off buying more of a stock that closed Thursday at $4.11.

But since Liberty’s cost basis in Sirius is pennies, we should all be lucky to make the same “mistake” Malone made.