Not sure where this website gets its data, but the data at least for Berkshire seems to be wrong: BRK-B is down more than 8% YTD.
Yup.
Berkshire -9% YTD.
Vanguard Value index VTV -9%
Vanguard Growth index VUG -30%
SPY -20%
QQQ -29%
https://stockcharts.com/freecharts/perf.php?SPY,VEA,VTV,BRK/…
Coincidentally, my portfolio is also -9% YTD. Funny that.
And for fun, since Feb 14, 2020 (just before COVID):
Berkshire +20%
Vanguard Value index VTV +16%
Vanguard Growth index VUG +13%
SPY +16%
QQQ +21%