Reverse acquisition? IE, similar to how Disney "bought" Pixar, but much of Pixar's IP overshadows Disney's IP; or how Apple bought Next and the current MacOS is basically NextOS under the hood.
It's a technique that companies do to avoid disruption: Buy early stage startups, and by the time they could "disrupt" the parent company, the parent company's management is ready to retire, and the former startup's management is ready to take their place.
In what way does Pixar's IP overshadow Disney's? Listing the highest-grossing media franchises [1], Mickey Mouse, Winnie the Pooh, Star Wars, and Disney Princesses are on #2-#5 respectively, while Pixar's top spot is #16 with Cars.
Because, in the 1990s, Pixar's IP was more popular than Disney's. The story (as I remember it from a Jobs biography) was that, in the Disney parks, there were longer lines for Pixar characters than Disney characters.
Someone in leadership (don't remember the name) basically swallowed pride and bought Pixar from Jobs. It was considered a "reverse acquisition" because Jobs had so much stock he technically controlled Disney afterwards.
This was certainly true for animated movies in the 2000s (where Pixar clearly dominated), although not the companies as a whole. Pixar shareholders (including Jobs) owned about 15% after the deal.
This isn't a reverse acquisition, it's just a normal acquisition. Company A (Disney) has many things but is missing one thing (an animation team that doesn't suck), so they buy a company that does have that thing.
It's a technique that companies do to avoid disruption: Buy early stage startups, and by the time they could "disrupt" the parent company, the parent company's management is ready to retire, and the former startup's management is ready to take their place.