I've been thinking about Warren Buffett's approach to investing lately, especially his philosophy on when to actually sell stock. Most people know his famous line about wanting to hold forever, but here's the thing - the man actually sells pretty regularly. There's a method to it though.

Buffett's whole framework basically comes down to this: you don't sell stock just because the price went up or because you're nervous about the market. You sell when the thesis changes. If you bought a company because of specific fundamentals and those fundamentals deteriorate, that's when you consider an exit. Or if you find a better opportunity elsewhere - that's legitimate too.

The interesting part is how this plays out in practice. Berkshire Hathaway itself sits on massive cash positions sometimes, which tells you something. They're not obsessed with being fully invested. They're patient about deploying capital and patient about holding positions. But when they do sell stock, it's usually deliberate.

I think a lot of retail investors get this backwards. They hold losers hoping for a comeback while selling winners too early for a quick gain. Buffett does the opposite - he'll ride winners for decades but won't hesitate to cut losses or exit positions where the story has changed.

The real skill isn't knowing when to buy. It's knowing when to sell stock with conviction, whether that's because your original investment case broke down or because you've found something better. That discipline is probably what separates long-term wealth builders from people who just chase momentum.

If you're serious about this stuff, it's worth really understanding what you own and why. That clarity makes the sell decision way easier when the time comes.