Weatherford International (WFRD) had the lowest return in May 2019 by a US stock, returning -91.7%.

ASSET	MONTH	% RETURN
Weatherford International (WFRD)	May 2019	-91.69%
Integra Resources (ITRG)	May 2019	-80%
Seanergy Maritime (SHIP)	May 2019	-75.31%
JJill (JILL)	May 2019	-73.67%
Electrocore LLC (ECOR)	May 2019	-72.6%
Up Fintech (TIGR)	May 2019	-65.67%
FuelCell Energy (FCEL)	May 2019	-61.86%
Can Fite Biopharma Ltd ADR (CANF)	May 2019	-61.58%
Nutex Health (NUTX)	May 2019	-60.26%
Bridgeline Digital (BLIN)	May 2019	-59.66%
NovaBay Pharmaceuticals (NBY)	May 2019	-56.57%
Rayonier Advanced Materials (RYAM)	May 2019	-56.12%
Puma Biotechnology (PBYI)	May 2019	-54.3%
GameSquare (GAME)	May 2019	-53.25%
BioCryst Pharmaceuticals (BCRX)	May 2019	-53.15%
Inuvo (INUV)	May 2019	-52.41%
Aethlon Medical (AEMD)	May 2019	-52.05%
Xenetic Biosciences (XBIO)	May 2019	-51.77%
Bit Digital (BTBT)	May 2019	-50.42%
Sellas Life Sciences (SLS)	May 2019	-50.17%
Kezar Life Sciences (KZR)	May 2019	-50.03%
Forte Biosciences (FBRX)	May 2019	-48.59%
Seres Therapeutics (MCRB)	May 2019	-47.7%
Amplify Energy (AMPY)	May 2019	-47.49%
Evolus (EOLS)	May 2019	-47.1%