Exhibit 99.1

PQ Group Holdings Reports Record Fourth Quarter, 2017 Year End Results,
and Guidance for 2018

Sales for the fourth quarter of $358 million up ~11%; sales for the full year of $1,472 million up ~5% from 2016 pro forma1 sales;
Net Income of $65 million for the quarter and $58 million for the full year;
Adjusted EBITDA for the fourth quarter of $109 million up ~10%; Adjusted EBITDA for the year of $453 million up ~8% from 2016 pro forma1 Adjusted EBITDA;
Completed and integrated Sovitec acquisition; and
Providing 2018 outlook; Sales of $1,545 million to $1,575 million and Adjusted EBITDA of $470 million to $490 million; Free Cash Flow of $120 million to $140 million

MALVERN, PA., March 21, 2018
-- PQ Group Holdings Inc. (NYSE:PQG) (“PQ” or the “Company”), reported sales of $358.1 million for the fourth quarter of 2017, a 10.9% increase from the fourth quarter of 2016. Net income for the fourth quarter was $65.0 million. Fourth quarter Adjusted EBITDA increased by 10.3% to $109.4 million.

“With a strong fourth quarter finish, we posted record financial performance in 2017. We successfully grew our business while expanding our margins by 70 basis points to 28%. I'm proud of the team's ability to deliver these attractive results while also achieving the milestone of taking PQ public during the year," commented Jim Gentilcore, Chairman and Chief Executive Officer of PQ.

Sales for 2017 were $1,472.1 million, an increase of 4.9% from 2016 pro forma sales. Net income for 2017 was $57.6 million. Adjusted EBITDA for 2017 increased to $453.3 million, up 7.7% from 2016 pro forma Adjusted EBITDA.

Mr. Gentilcore stated, "We expect another year of attractive growth in 2018 for sales and Adjusted EBITDA with sustained Adjusted EBITDA margins. Cash flow generation in 2018 will be significantly higher than 2017 and we anticipate meaningful year-on-year growth in net earnings as we continue to deleverage our balance sheet."

On May 4, 2016, we consummated a series of transactions to reorganize and combine the businesses of PQ Holdings Inc. and Eco Services Operations LLC under a new holding company, PQ Group Holdings Inc. (the “Business Combination”).  In this press release, we present unaudited pro forma information for the year ended December 31, 2016, which gives effect to the Business Combination and the related financing transactions as if they occurred on January 1, 2015.  Such information is illustrative and not intended to represent what our results of operations would have been had the Business Combination and the related financing transactions occurred at any time prior to May 4, 2016 or to project our results of operations for any future period.  Such information may not be comparable to, or indicative of, future performance

The financial results and outlook include Non-GAAP financial measures. These non-GAAP measures are more fully described and are reconciled from the respective measures determined under GAAP, in “Presentation of Non-GAAP Financial Measures” and the attached table “PQ Non-GAAP Reconciliations.”

PQ Group Holdings Fourth Quarter and Year 2017 Earnings Release
Page 1

The following information was filed by Pq Group Holdings Inc. (PQG) on Wednesday, March 21, 2018 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-K Annual Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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