I know of one company which explicitly has this approach: http://tiny.website/

> We won't try to flip your business in 3-5 years. We won't mess with your team and culture. We won't lock you into golden handcuffs or push complex deal terms. We won't ruin your life with months of unnecessary due diligence. We won't renegotiate and grind you on terms.

> …

> We started Tiny to create the buyer we wish we could have sold to.

Background: https://medium.com/@awilkinson/the-berkshire-hathaway-of-the...

To my knowledge, no one else makes similar commitments to both keep good things as-is and also to buy and hold indefinitely. At least from the outside, Tiny's model is unique.