Ubiquiti Networks (UI) had the lowest return in May 2026 by a large-cap US stock, returning -42.9%.

ASSET	MONTH	% RETURN
Ubiquiti Networks (UI)	May 2026	-42.85%
Zoetis (ZTS)	May 2026	-33.15%
Futu (FUTU)	May 2026	-33.04%
Symbotic (SYM)	May 2026	-21.88%
Insmed (INSM)	May 2026	-21.19%
AutoZone (AZO)	May 2026	-21.1%
LPL Financial (LPLA)	May 2026	-17.98%
Cheniere Energy (LNG)	May 2026	-17.8%
Coupang LLC (CPNG)	May 2026	-17.74%
Trimble (TRMB)	May 2026	-17.73%
Medline Inc Class A Common Stock (MDLN)	May 2026	-17.73%
Companhia de Saneamento Basico do Estado de Sao Paulo SABESP ADR (SBS)	May 2026	-17.71%
Intuit (INTU)	May 2026	-17.57%
Gfl Environmental (GFL)	May 2026	-17.25%
Dow (DOW)	May 2026	-16.72%
Hesai Group Sponsored ADR (HSAI)	May 2026	-16.67%
Boston Scientific (BSX)	May 2026	-16.61%
Chime Financial, Inc Class A Common Stock (CHYM)	May 2026	-16.48%
JBS (JBS)	May 2026	-16.39%
Watsco (WSO)	May 2026	-16.16%
Coca-Cola Consolidated (COKE)	May 2026	-15.9%
PDD (PDD)	May 2026	-15.4%
Li Auto (LI)	May 2026	-15.3%
Huntington Ingalls Industries (HII)	May 2026	-15.26%
Ferguson (FERG)	May 2026	-14.99%

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