X0206 3 2017-04-06 0 0001062231 AMERICAN AXLE & MANUFACTURING HOLDINGS INC AXL 0001475483 AMERICAN SECURITIES LLC 299 PARK AVENUE, 34TH FLOOR NEW YORK NY 10171 0 0 1 0 0001626084 ASP MD Investco LP C/O AMERICAN SECURITIES LLC 299 PARK AVENUE, 34TH FLOOR NEW YORK NY 10171 0 0 1 0 0001504662 American Securities Partners VI, L.P. C/O AMERICAN SECURITIES LLC 299 PARK AVENUE, 34TH FLOOR NEW YORK NY 10171 0 0 1 0 0001504663 American Securities Partners VI(B), L.P. C/O AMERICAN SECURITIES LLC 299 PARK AVENUE, 34TH FLOOR NEW YORK NY 10171 0 0 1 0 0001532680 American Securities Partners VI(C), L.P. C/O AMERICAN SECURITIES LLC 299 PARK AVENUE, 34TH FLOOR NEW YORK NY 10171 0 0 1 0 0001532681 American Securities Partners VI(D), L.P. C/O AMERICAN SECURITIES LLC 299 PARK AVENUE, 34TH FLOOR NEW YORK NY 10171 0 0 1 0 0001627455 American Securities Associates VI, LLC C/O AMERICAN SECURITIES LLC 299 PARK AVENUE, 34TH FLOOR NEW YORK NY 10171 0 0 1 0 0001626076 Penn Kevin S. C/O AMERICAN SECURITIES LLC 299 PARK AVENUE, 34TH FLOOR NEW YORK NY 10171 1 0 0 0 0001626074 Easton Loren S. C/O AMERICAN SECURITIES LLC 299 PARK AVENUE, 34TH FLOOR NEW YORK NY 10171 1 0 0 0 Common Stock, par value $0.01 per share ("Common Stock") 8670 D Common Stock 25682679 D Shares directly owned by American Securities LLC ("ASL"). Shares directly owned by ASP MD Investco LP ("Investco") that may also be deemed to be indirectly beneficially owned by ASL and each of: American Securities Partners VI, L.P., American Securities Partners VI(B), L.P., American Securities Partners VI(C), L.P. and American Securities Partners VI(D), L.P. (each, a "Sponsor"), the owners of partnership interests in Investco, and American Securities Associates VI, LLC, the general partner of each Sponsor. ASL also provides investment advisory services to each Sponsor. Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of such Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. Kevin Penn is a managing director of ASL and a director of the Issuer. Loren Easton is a managing director of ASL and a director of the Issuer. Exhibit 99.1 Joint Filer Information is incorporated herein by reference. ASP MD Investco LP, By: ASP Manager Corp., its general partner, By: /s/ Michael G. Fisch, as President 2017-04-17 American Securities Partners VI, L.P., By: American Securities Associates VI, LLC, its general partner, By: /s/ Michael G. Fisch, as Managing Member 2017-04-17 American Securities Partners VI(B), L.P., By: American Securities Associates VI, LLC, its general partner, By: /s/ Michael G. Fisch, as Managing Member 2017-04-17 American Securities Partners VI(C), L.P., By: American Securities Associates VI, LLC, its general partner, By: /s/ Michael G. Fisch, as Managing Member 2017-04-17 American Securities Partners VI(D), L.P., By: American Securities Associates VI, LLC, its general partner, By: /s/ Michael G. Fisch, as Managing Member 2017-04-17 American Securities Associates VI, LLC, By: /s/ Michael G. Fisch, as Managing Member 2017-04-17 American Securities LLC, By: /s/ Michael G. Fisch, as President and Chief Executive Officer 2017-04-17 /s/ Kevin S. Penn 2017-04-17 /s/ Loren S. Easton 2017-04-17