Get To Know Mid-Cap U.S. Equities By: TalkMarkets July 22, 2019 at 23:05 PM EDT The S&P MidCap 400 maintains a similar trailing price-to-earnings ratio to the S&P 500, indicating similar valuations of mid-cap and large-cap companies. Read More >> Related Stocks: Mid Cap SPDR 400 Trust, Series 1 S&P Midcap 400 ETF Vanguard