Shares of Masco Corp. MAS.N fell as much as 12% to $71.82.
The stock was set for its worst day since March 2020 if losses hold.
The home improvement firm missed second-quarter sales estimates, hurt by weak demand for discretionary renovation projects amid macroeconomic uncertainty.
Masco reported quarterly sales of $1.99 billion versus estimates of $2.08 billion, according to data compiled by LSEG.
Sales in the plumbing products segment, a major revenue contributor, fell 3% from a year ago.
The company raised its full-year adjusted EPS forecast to between $4.40 and $4.60, from prior expectations of $4.10 to $4.30, on the back of an expected tariff refund.
It also reported adjusted EPS of $1.64, beating expectations of $1.32.
As of the last close, MAS stock was up 28.6% year to date.