Did you try that in the decades prior to, say, 2015?

No, I was just responding to the OP's post about bailing out this January.

And I find it interesting to try out portfolios at testfol.io, since portfoliovisualizer went paywall. It's easy and fun to play with. I toss him a few bucks every once in a while.

While eating lunch it occurred to a possible fairly easy way to see what the S&P500 did since January aside from those supergigacap monsters. Surprisingly well, way above average. They only added 7.4%. So it was a good year for EVERYBODY, not just those 10-12 stocks. It's not like those 10 carried the other 490 duds, since they were NOT duds (as a group).

GOOG beat earning estimates yesterday, MSFT beat estimates today. "Microsoft gained 2% in after hours trading."
Tomorrow Amazon and Apple report.

For now at least, it is good to have a large weight in those dozen stocks. 2024 is shaping up to be a very good year. Bailing out in January wasn't a good move. Being driven by emotional fear wasn't a good move.

There are times when the place to be is in mega-caps.