Entering trading on Monday, the S&P 500 has declined around 6% since the start of the year. Three stocks that are down over 10% this year and trading at low earnings multiples are Pfizer (NYSE: PFE), PayPal (NASDAQ: PYPL), and Builders FirstSource (NYSE: BLDR). Investors haven't been all that bullish on Pfizer this year -- it's down 13% thus far in 2025.