Ryan Reynolds was a no-show during Friday night ... the JP Morgan summit alongside Disney boss Bob Iger and agent Bryan Lourd. Reynolds shared snaps from his night to his Instagram, captioning ...

Ryan Reynolds is not just any Marvel anti-hero ... sent a legal letter to Marvel boss Kevin Feige and Disney CEO Bob Iger, accusing Reynolds of taking direct aim during the segment.

That's certainly the tone and likely immediate impact of a January 7 letter sent to CEO Bob Iger and Marvel boss ... the Merc with a Mouth himself Ryan Reynolds and Lively, it says.

While Ryan Reynolds was not present at the 30th annual ... "Had an amazing time on stage at the @jpmorgan summit with Bob ...