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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549 

FORM 10-K

(Mark One)

For the fiscal year ended December 31, 2019

OR

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

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  ý Yes  ¨  No  

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    ¨ Yes  ý  No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    ý Yes  ¨  No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    ý Yes  ¨  No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).     ☐ Yes  ý  No

The aggregate market value of PQ Group Holdings Inc. voting and non-voting common equity held by non-affiliates as of June 28, 2019 (the last business day of the registrant’s most recently completed second fiscal quarter) based on the closing sale price of $15.85 per share as reported on the New York Stock Exchange was $645,970,269.

The number of shares of common stock outstanding as of February 21, 2020 was 136,790,094.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the PQ Group Holdings Inc. Proxy Statement for the 2020 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.

PQ GROUP HOLDINGS INC.

INDEX—FORM 10-K

December 31, 2019