ATI Inc. (previously Allegheny Technologies Incorporated) is an American producer of specialty materials headquartered in Dallas, Texas.

[1] ATI's key markets are aerospace and defense particularly commercial jet engines (over 50% of sales), oil & gas, chemical process industry, electrical energy, and medical.

[1] The company's plants in Western Pennsylvania include facilities in Harrison Township (Allegheny Ludlum's Brackenridge Works), Vandergrift, and Washington.

[5] Through the 1970s, Allegheny Ludlum periodically cooperated with Ford to build several one-off promotional cars with stainless steel bodies.

[7] A year later, Allegheny Ludlum acquired Kennedy Company, a maker of magnetic tape products for large computer systems for an undisclosed sum.

[10] In 1986, the company suffered a $198 million operating loss and chairman Robert Buckley, stepped down amid accusations of mismanagement.

[22] Allegheny Technologies debuted its ATI 425 Titanium Alloy on June 14, 2010, at the land and air-land defense and security exhibition Eurosatory in Paris, France.

[26] The latter plant was idled because other global suppliers, who had entered the market recently, could undercut the Rowley titanium sponge.

[17] In September 2016 the company said it would shut down its Frackville plant, which produced titanium bar and hair-thin wire in a 55,000-square-foot facility.

[17] As of September 2023 ATI was "a $3.8 billion company" with more than 6,000 workers in more than 30 locations in the United States and more than a dozen in Europe and Asia.

[32] In June 2023 ATI announced a $28 million expansion of its Richland WA plant, located in the Horn Rapids Industrial Park.

[36] In 2005, Allegheny Ludlum agreed to pay a $2,375,000 penalty to settle a lawsuit brought by the U.S. Department of Justice on behalf of the United States Environmental Protection Agency in 1995, which alleged that the company had unlawfully discharged oil and other pollutants, such as chromium, zinc, copper, and nickel, into the Allegheny River and Kiskiminetas River in the suburbs of Pittsburgh.