UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2019 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission file number 1-12001 Securities registered pursuant to Section 12(b) of the Act: Securities registered pursuant to Section 12(g) of the Act: None | -- ...

Allegheny Technologies Incorporated (NYSE:ATI) Q4 2019 Earnings Conference Call February 4, 2020 8:30 AM ET Company Participants Scott Minder - Vice President, Treasurer and Investor Relations Bob Wetherbee - President and Chief Executive Officer Don Newman - Senior Vice President, Finance and Chief Financial Officer John Sims - Executive Vice President, High Performance Materials and Components segment Kim Fields - Executive Vice President, Flat Rolled Products Pat DeCourcy - Senior Vice President, Finance ...

Table of Contents Title of each class Trading Symbol Name of each exchange on which registered Common stock, par value $0.10 ATI New York Stock Exchange Emerging growth company ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended September 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transitio ...

Allegheny Technologies Incorporated (NYSE:ATI) Q3 2019 Earnings Conference Call October 31, 2019 8:30 AM ET Company Participants Scott Minder – Vice President, Treasurer and Investor Relations Bob Wetherbee – President and Chief Executive Officer John Sims – Executive Vice President, High Performance Materials and Components segment Kim Fields – Executive Vice President, Flat Rolled Products Pat DeCourcy – Senior Vice President, Finance and Chief Financial Officer Conference Call Participants Richard Safran ...

Table of Contents Title of each class Trading Symbol Name of each exchange on which registered Common stock, par value $0.10 ATI New York Stock Exchange Emerging growth company ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended June 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Per ...

Allegheny Technologies Incorporated. (NYSE:ATI) Q2 2019 Results Earnings Conference Call July 23, 2019 8:30 AM ET Company Participants Scott Minder - VP, Treasurer & IR Bob Wetherbee - President and CEO John Sims - EVP, High Performance Materials and Components Segment Kim Fields - EVP, Flat Rolled Products Pat DeCourcy - SVP, Finance and CFO Kevin Kramer - SVP, Chief Commercial and Marketing Officer Conference Call Participants Gautam Khanna - Cowen & Company David Strauss - Barclays Richard Safran - Bucki ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended March 31, 2019 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period From to | --- | --- | |------------------------------------------------------------------------------------------------------------|-----------------------| ...