Monday (MNDY) had the highest return in August 2021 by a large-cap US stock, returning 70.5%.

ASSET	MONTH	% RETURN
Monday (MNDY)	August 2021	70.5%
Affirm (AFRM)	August 2021	66.45%
Full Truck Alliance Co Ltd ADR (YMM)	August 2021	63.41%
Doximity (DOCS)	August 2021	47.32%
GameStop (GME)	August 2021	34.72%
Dick’s Sporting Goods (DKS)	August 2021	34.69%
Ascendis Pharma A-S (ASND)	August 2021	31.87%
Pure Storage (PSTG)	August 2021	31.45%
Joby Aviation (JOBY)	August 2021	28.38%
Datadog (DDOG)	August 2021	24.31%
Embraer SA ADR (ERJ)	August 2021	24.15%
Robinhood Markets (HOOD)	August 2021	23.21%
Williams-Sonoma (WSM)	August 2021	22.26%
Paycom Soft (PAYC)	August 2021	21.77%
DraftKings (DKNG)	August 2021	21.25%
Sea (SE)	August 2021	20.92%
ZoomInfo Technologies (GTM)	August 2021	20.72%
EchoStar (SATS)	August 2021	20.64%
YPF Sociedad Anonima (YPF)	August 2021	20.32%
Palantir Technologies Inc Class A Common Stock (PLTR)	August 2021	20.22%
Builders FirstSource (BLDR)	August 2021	19.67%
Celsius (CELH)	August 2021	18.98%
Ball (BALL)	August 2021	18.76%
Unity Software (U)	August 2021	18.75%
CyberArk Software (CYBR)	August 2021	17.99%

Large-cap stocks are treated as having a market cap of $10B+.