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Washington, D.C. 20549








Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934



Date of Report

(Date of earliest event reported):  February 24, 2020



(Exact name of registrant as specified in its charter)







(State or other jurisdiction of incorporation)


(Commission File Number)


(IRS Employer Identification No.)


17988 Edison Avenue, Chesterfield, Missouri



(Address of principal executive offices)


(Zip Code)


Registrant’s telephone number, including area code:  (636) 530-8000


Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:



Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)


Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)


Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))


Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))



Securities registered pursuant to Section 12(b) of the Act:


Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Class A Common Shares, $0.01 par value


The Nasdaq Global Select Market



Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).  


                                                                                                                                                                Emerging growth company       


If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.               ☐




Item 5.02.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.


Effective February 24, 2020, Stephen P. Callahan resigned his position as Senior Vice President – Global Human Resources and HS&E. The Company has entered into a separation agreement with Mr. Callahan that provides for, among other things, the continuation of Mr. Callahan’s current base salary for the 18-month period beginning February 25, 2020, and the vesting of certain time-based restricted stock units awarded to Mr. Callahan in 2018, consistent with the terms of the award agreement. The Company will also pay for certain outplacement services for Mr. Callahan. In exchange, Mr. Callahan agreed to release any and all claims against the Company and agreed to certain post-termination restrictive covenants. Additionally, Mr. Callahan forfeited certain unvested restricted stock units and performance units upon his resignation. The foregoing description of Mr. Callahan’s separation agreement is qualified in its entirety by reference to such agreement, a copy of which will be filed as an exhibit to the Company’s Form 10-K for fiscal year ended December 31, 2019.







Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.















/s/ Mark A. Menghini 




Mark A. Menghini




Senior Vice President and General Counsel








Date: February 28, 2020