Shares of Kennametal Inc. /zigman2/quotes/208770361/composite KMT -0.42% plunged 15% in premarket trading Monday, after the industrial technology company warned Monday that fiscal first-quarter revenue would fall well more than expected and slashed its full-year outlook, citing further slowing in the general engineering, energy and transportation markets. The company expects to report revenue of $518 million down 12% from $587 million a year ago, and below the FactSet consensus of $547 million. For fiscal 2020, the company cut its adjusted earnings-per-share guidance range to $1.70 to $2.10 from $2.80 to $3.20, compared with the the FactSet consensus of $2.81, and revised its organic sales growth outlook to negative 9% to negative 5% from negative 2% to positive 2%. "Our first quarter results are well below our expectations as market conditions deteriorated more significantly than we anticipated across all regions, and primarily in the general engineering, energy and transportation end markets," said chief Executive Christopher Rossi. The company is projected to report results at or around the end of the month. The stock has dropped 10.2% over the past three months, while Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA -0.38% has slipped 1.4%.