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                              October 24, 2022

       Todd B. Patriacca
       Chief Financial Officer
       Altra Industrial Motion Corp.
       300 Granite Street, Suite 201
       Braintree, MA 02184

                                                        Re: Altra Industrial 
Motion Corp.
                                                            Form 10-K for the 
Fiscal Year Ended December 31, 2021
                                                            Filed February 28, 
2022
                                                            Form 8-K Furnished 
July 28, 2022
                                                            File No. 001-33209

       Dear Todd B. Patriacca:

              We have limited our review of your filing to the financial 
statements and related
       disclosures and have the following comments. In some of our comments, we 
may ask you to
       provide us with information so we may better understand your disclosure.

              Please respond to these comments within ten business days by 
providing the requested
       information or advise us as soon as possible when you will respond. If 
you do not believe our
       comments apply to your facts and circumstances, please tell us why in 
your response.

                                                        After reviewing your 
response to these comments, we may have additional comments.

       Form 10-K for the Fiscal Year Ended December 31, 2021

       Management's Discussion and Analysis of Financial Condition and Results 
of Operations
       Results of Operations, page 34

   1.                                                   We note you present the 
percentage of sales by end market in the Charts included as part
                                                        of your earnings 
releases furnished each quarter on Forms 8-K and these results, as well as
                                                        a comparison to prior 
periods, are discussed in detail in your earnings calls. Please tell us
                                                        your consideration of 
including this information in the results of operations discussion in
                                                        your MD&A. In this 
regard, we note you qualitatively refer to the impact various end
                                                        market results had on 
changes in net sales; however, including quantitative information
                                                        for all end markets 
would appear to add context to your discussion, as well as provide
                                                        information consistent 
with what is disclosed elsewhere.
 Todd B. Patriacca
Altra Industrial Motion Corp.
October 24, 2022
Page 2
Form 8-K Furnished July 28, 2022

Exhibit 99.1, page 1

2.    We note your non-GAAP measures exclude the results of the divested JVS 
business. As
      these divested operations did not meet the criteria for being presented 
as discontinued
      operations pursuant to ASC 205-20, your non-GAAP measures appear to 
substitute
      individually tailored recognition and measurement methods for those of 
GAAP. Please
      revise to remove these adjustments from each measure. Refer to Question 
100.04 of the
      Non-GAAP C&DIs.
3.    Revise to include net income margin, the comparable GAAP measure to 
adjusted
      EBTIDA margin, with greater prominence. Also, revise to include, with 
greater
      prominence, income from operations as a percentage of net sales for each 
segment, the
      comparable GAAP measure to non-GAAP income from operations as a 
percentage of
      segment net sales. Refer to Item 10(e)(1)(i)(A) of Regulation S-K.
4.    We note that your "Reconciliation of Non-GAAP Income from Operations by 
Segment"
      begins with income from operations by segment; however this does not 
agree to your
      GAAP segment measure of performance as disclosed on page 21 of your Form 
10-Q for
      the quarterly period ended June 30, 2022. Please revise accordingly.
       In closing, we remind you that the company and its management are 
responsible for the
accuracy and adequacy of their disclosures, notwithstanding any review, 
comments, action or
absence of action by the staff.

        You may contact Melissa Kindelan, Senior Staff Accountant, at (202) 
551-3564 or
Christine Dietz, Senior Staff Accountant, at (202) 551-3408 with any questions.



                                                          Sincerely,
FirstName LastNameTodd B. Patriacca
                                                          Division of 
Corporation Finance
Comapany NameAltra Industrial Motion Corp.
                                                          Office of Technology
October 24, 2022 Page 2
cc:       Glenn Deegan
FirstName LastName