Tech now makes up a third of the SPX, says ProShares' Simeon Hyman. While tech stocks made some investors lots of gains in 2025, Simeon makes the case that it's important to hedge against downside risk once volatility reignites in the sector. He talks about the ProShares S&P 500 Ex-Technology ETF (SPXT) as a way investors can take a barbell approach to investing in technology.