Performance of Argent Mid Cap ETF Trails S&P 500 Over Recent Periods Recent data shows AMID lagging the S&P 500, with a one-year return of -3.42% versus the index’s 5.34%. The ETF’s three-year return, however, remains positive at 24.1%. The fund’s expense ratio is 0.52%, and top holdings include Copart, Fortinet, and Fair Isaac Corporation.12