Something wild: $MU and $NVDA are projected to drive roughly 35% of the entire S&P 500's Q3 earnings growth. Just the two of them.

That's not a typo. Two companies carrying over a third of the index's profit expansion.

And yet both are trading at valuations that feel almost too reasonable given that kind of earnings firepower. The market's pricing in doubt, but the numbers keep screaming otherwise.

When concentration meets undervaluation, things get interesting.