As of late 2021, if you invested ten years back:

* https://seekingalpha.com/article/4423498-berkshire-hathaway-...

Note: price only comparison. S&P 500 funds generally give dividends (which can be re-invested). The (very) recent pull back has evened things out a bit:

> Over the past year, Berkshire is up 33%, double the gain in the S&P 500. The stock is now ahead of the S&P 500 over the past 10 years, 15.4% annualized versus 14.5% for the index, but still behind in the past five years, 13.3% annualized against 14.9% for the index.

* https://www.barrons.com/articles/warren-buffetts-berkshire-h...

Ten years can be a long slog to stick with a particular stock if your future retirement / financial future depends on it.