Exhibit 99.1

PQ GROUP HOLDINGS INC.
UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Overview

On December 14, 2020, PQ Corporation, an indirect, wholly owned subsidiary of PQ Group Holdings Inc. (the “Company”), completed the previously announced sale of its Performance Materials business to Potters Buyer, LLC (the “Purchaser”), an affiliate of The Jordan Company, L.P. pursuant to a Stock Purchase Agreement (the “Purchase Agreement”) dated October 15, 2020 between PQ Corporation and the Purchaser, for a purchase price of $650.0 million in cash, subject to certain adjustments specified in the Purchase Agreement, including for indebtedness, cash, working capital and transaction expenses of the Performance Materials business at the closing of the transaction (such transaction, the “Transaction”). Pursuant to the Transaction, the Company divested its Performance Materials business to the Purchaser through the sale of the Company’s direct and indirect equity interest in each of the Company’s subsidiaries comprising the Performance Materials business.
The closing of the Transaction triggered PQ Corporation’s obligation to provide partial repayment under both its Amended and Restated Term Loan Credit Agreement, dated May 4, 2016, and its New Term Loan Credit Agreement, dated as of July 22, 2020, of an estimated $275.8 million and $188.7 million, respectively (the “Estimated Required Debt Repayment”).
In connection with the closing of the Transaction, the Company’s Board of Directors declared a special cash dividend of $250.0 million, or $1.80 per share, payable on December 29, 2020 to shareholders of record as of the close of business on December 21, 2020.
In the fourth quarter of 2020, the Performance Materials business met the criteria set forth in Accounting Standards Codification 205-20, Presentation of Financial Statements – Discontinued Operations (“ASC 205-20”). As a result, the Performance Materials business will be presented as discontinued operations in the Company’s consolidated financial statements beginning with its Annual Report on Form 10-K for the year ended December 31, 2020.
The unaudited pro forma condensed consolidated financial statements were prepared in accordance with Article 11 of Regulation S-X and have been derived from the historical financial statements prepared in accordance with accounting principles generally accepted in the United States of America and are presented based on available information and certain assumptions that management believes are reasonable.
The unaudited pro forma financial information presents the Company’s unaudited pro forma condensed consolidated financial statements reflecting the effect of the Transaction as well as the Estimated Required Debt Repayment. The unaudited pro forma condensed consolidated statements of income reflect the effect of the Transaction as if it had occurred on January 1, 2017, the beginning of the earliest period presented. The unaudited pro forma condensed consolidated balance sheet reflects the Company’s financial position as if the Transaction and the Estimated Required Debt Repayment had occurred on September 30, 2020.
The unaudited pro forma condensed consolidated financial statements and the accompanying notes should be read in conjunction with the Company’s historical financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 and its Quarterly Report on Form 10-Q for the period ended September 30, 2020.
The unaudited pro forma condensed consolidated financial statements are provided for informational purposes only and are not necessarily indicative of the operating results that would have occurred if the Transaction had been completed as of the dates set forth above, nor is it indicative of the future results of the Company. The unaudited pro forma condensed consolidated financial statements do not purport to project the future operating results or financial position of the Company following the Transaction.

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PQ GROUP HOLDINGS INC.
UNAUDITED PRO FORMA CONDENSED CONSOLIDATED BALANCE SHEET
As of September 30, 2020
(In thousands)
Historical As Reported(A)
Divestiture of Performance Materials
(C)
Pro Forma Adjustments
Pro Forma
ASSETS
Cash and cash equivalents$164,348 $611,695 $(464,509)$311,534 
Accounts receivables, net196,082 (59,328)— 136,754 
Inventories, net249,662 (125,648)— 124,014 
Prepaid and other current assets37,409 (5,558)— 31,851 
Total current assets647,501 421,161 (464,509)604,153 
Investments in affiliated companies479,454 (120)— 479,334 
Property, plant and equipment, net1,135,757 (170,734)— 965,023 
Goodwill1,263,853 (293,635)— 970,218 
Other intangible assets, net638,772 (114,055)— 524,717 
Right-of-use lease assets56,232 (7,924)— 48,308 
Other long-term assets102,873 (68,818)— 34,055 
Total assets$4,324,442 $(234,125)$(464,509)$3,625,808 
LIABILITIES
Notes payable and current maturities of long-term debt$14,538 $(8,038)$— $6,500 
Accounts payable116,797 (29,687)— 87,110 
Operating lease liabilities—current16,774 (3,146)— 13,628 
Accrued liabilities86,117 31,871 (B)— 117,988 
Total current liabilities234,226 (9,000)— 225,226 
Long-term debt, excluding current portion1,905,007 (56,458)(455,686)1,392,863 
Deferred income taxes224,457 (31,220)(B)— 193,237 
Operating lease liabilities—noncurrent38,341 (4,499)— 33,842 
Other long-term liabilities118,225 (18,724)— 99,501 
Total liabilities2,520,256 (119,901)(455,686)1,944,669 
EQUITY
Common stock1,368 — — 1,368 
Preferred stock— — — — 
Additional paid-in capital1,715,504 — — 1,715,504 
Retained earnings (accumulated deficit)126,675 (118,868)(8,823)(1,016)
Treasury stock(10,534)— — (10,534)
Accumulated other comprehensive loss(32,526)5,534 — (26,992)
Total PQ Group Holdings Inc. equity1,800,487 (113,334)(8,823)1,678,330 
Noncontrolling interest3,699 (890)— 2,809 
Total equity1,804,186 (114,224)(8,823)1,681,139 
Total liabilities and equity$4,324,442 $(234,125)$(464,509)$3,625,808 
See accompanying notes to the unaudited pro forma condensed consolidated financial statements.
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PQ GROUP HOLDINGS INC.
UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
Nine Months Ended September 30, 2020
(In thousands, except per share amounts)
Historical As Reported(D)
Divestiture of Performance Materials
Pro Forma
Sales$1,101,442 $(280,664)$820,778 
Cost of goods sold823,503 (208,854)614,649 
Gross profit277,939 (71,810)206,129 
Selling, general and administrative expenses119,294 (26,338)92,956 
Other operating expense, net47,059 (16,585)30,474 
Operating income111,586 (28,887)82,699 
Equity in net (income) from affiliated companies(20,025)— (20,025)
Interest expense, net65,372 (12,810)52,562 
Debt extinguishment costs16,517 — 16,517 
Other (income) expense, net(4,297)1,201 (3,096)
Income before income taxes and noncontrolling interest54,019 (17,278)36,741 
Provision for income taxes29,453 (3,077)26,376 
Net income24,566 (14,201)10,365 
Less: Net income attributable to the noncontrolling interest904 (219)685 
Net income attributable to PQ Group Holdings Inc.$23,662 $(13,982)$9,680 
Net income per share:
Basic income per share$0.17 $0.07 
Diluted income per share$0.17 $0.07 
Weighted average shares outstanding
Basic135,292,163 135,292,163 
Diluted136,188,033 136,188,033 
See accompanying notes to the unaudited pro forma condensed consolidated financial statements.

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PQ GROUP HOLDINGS INC.
UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
Year Ended December 31, 2019
(In thousands, except per share amounts)
Historical As Reported(D)
Divestiture of Performance Materials
Pro Forma
Sales$1,567,072 $(373,686)$1,193,386 
Cost of goods sold1,176,550 (281,566)894,984 
Gross profit390,522 (92,120)298,402 
Selling, general and administrative expenses166,880 (37,364)129,516 
Other operating expense, net35,840 (14,462)21,378 
Operating income187,802 (40,294)147,508 
Equity in net (income) from affiliated companies(46,034)12 (46,022)
Interest expense, net111,525 (24,453)87,072 
Debt extinguishment costs3,400 — 3,400 
Other (income) expense, net(2,098)(200)(2,298)
Income before income taxes and noncontrolling interest121,009 (15,653)105,356 
Provision for income taxes40,699 (8,020)32,679 
Net income80,310 (7,633)72,677 
Less: Net income attributable to the noncontrolling interest771 (154)617 
Net income attributable to PQ Group Holdings Inc.$79,539 $(7,479)$72,060 
Net income per share:
Basic income per share$0.59 $0.54 
Diluted income per share$0.59 $0.53 
Weighted average shares outstanding
Basic134,389,667 134,389,667 
Diluted135,548,694 135,548,694 
See accompanying notes to the unaudited pro forma condensed consolidated financial statements.

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PQ GROUP HOLDINGS INC.
UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
Year Ended December 31, 2018
(In thousands, except per share amounts)
Historical As Reported(D)
Divestiture of Performance Materials
Pro Forma
Sales$1,608,154 $(386,921)$1,221,233 
Cost of goods sold1,226,520 (308,679)917,841 
Gross profit381,634 (78,242)303,392 
Selling, general and administrative expenses168,628 (37,226)131,402 
Other operating expense, net29,450 (13,023)16,427 
Operating income183,556 (27,993)155,563 
Equity in net (income) from affiliated companies(37,611)42 (37,569)
Interest expense, net113,723 (22,965)90,758 
Debt extinguishment costs7,751 — 7,751 
Other (income) expense, net11,077 (191)10,886 
Income before income taxes and noncontrolling interest88,616 (4,879)83,737 
Provision for income taxes28,995 1,229 30,224 
Net income59,621 (6,108)53,513 
Less: Net income attributable to the noncontrolling interest1,321 (213)1,108 
Net income attributable to PQ Group Holdings Inc.$58,300 $(5,895)$52,405 
Net income per share:
Basic income per share$0.44 $0.39 
Diluted income per share$0.43 $0.39 
Weighted average shares outstanding
Basic133,380,567 133,380,567 
Diluted134,684,931 134,684,931 
See accompanying notes to the unaudited pro forma condensed consolidated financial statements.

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PQ GROUP HOLDINGS INC.
UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENT OF INCOME
Year Ended December 31, 2017
(In thousands, except per share amounts)
Historical As Reported(D)
Divestiture of Performance Materials
Pro Forma
Sales$1,472,101 $(333,363)$1,138,738 
Cost of goods sold1,095,265 (250,807)844,458 
Gross profit376,836 (82,556)294,280 
Selling, general and administrative expenses146,723 (33,818)112,905 
Other operating expense, net64,225 (18,331)45,894 
Operating income165,888 (30,407)135,481 
Equity in net income from affiliated companies(38,772)— (38,772)
Interest expense, net179,044 (25,003)154,041 
Debt extinguishment costs61,886 — 61,886 
Other (income) expense, net24,364 845 25,209 
Loss before income taxes and noncontrolling interest(60,634)(6,249)(66,883)
Benefit for income taxes(119,197)12,596 (106,601)
Net income58,563 (18,845)39,718 
Less: Net income attributable to the noncontrolling interest960 (276)684 
Net income attributable to PQ Group Holdings Inc.$57,603 $(18,569)$39,034 
Net income per share:
Basic income per share$0.52 $0.35 
Diluted income per share$0.52 $0.35 
Weighted average shares outstanding
Basic111,299,670 111,299,670 
Diluted111,669,037 111,669,037 
See accompanying notes to the unaudited pro forma condensed consolidated financial statements.

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PQ GROUP HOLDINGS INC.
NOTES TO UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
The historical condensed consolidated financial statements have been adjusted to give pro forma effect to events that are (i) directly attributable to the Transaction and Estimated Required Debt Payment, (ii) expected to have a continuing impact on the future results of the Company, and (iii) factually supportable. The special dividend is not reflected in the unaudited pro forma condensed consolidated financial statements as it was not a required use of proceeds from the Transaction.
The unaudited pro forma condensed consolidated financial statements (i) are presented based upon available information and assumptions that the Company believes are reasonable, (ii) are intended for informational purposes only, (iii) are not necessarily indicative of and do not purport to represent what the Company’s operating results would have been had the Transaction and related events occurred as described or what the Company’s future operating results will be after giving effect to these events, and (iv) do not reflect all actions that may be undertaken by the Company after the divestiture of the Performance Materials business. The actual financial position and results of operations may differ significantly from the pro forma amounts reflected herein due to a variety of factors.
(A)The unaudited pro forma condensed consolidated balance sheet as of September 30, 2020 reflects the following divestiture-related adjustments as if the Transaction occurred on September 30, 2020:
The cash proceeds received, net of estimated transaction costs and closing adjustments, in connection with the Transaction
The elimination of the net assets subject to the Performance Materials divestiture
Estimated income tax provision resulting from the Transaction
Recognition of a preliminary $118.9 million loss on sale, net of taxes. The actual after-tax loss to be recorded on the sale of Performance Materials may change based on items such as adjustments to the estimated transaction costs as well as final calculations related to the tax basis of the assets. The preliminary estimated loss was calculated as follows (in millions):

Estimated proceeds, net of transaction costs and closing adjustments $629.7 
Performance Materials net assets held for sale (677.3)
Recognition of accumulated translation adjustments resulting from the sale of Performance Materials’ foreign subsidiaries (5.5)
Pre-tax loss on the sale of Performance Materials(53.1)
Estimated tax provision on the sale of Performance Materials(65.8)
After-tax loss on the sale of Performance Materials $(118.9)

(B)In addition to the removal of income taxes payable and deferred taxes pursuant to the Transaction, this adjustment reflects preliminary estimates of the Company’s income tax payable of $48.9 million resulting from the Transaction and a net increase in deferred tax liabilities of $16.9 million related to a reduction in a deferred tax asset of $45.6 million from the planned use of net operating loss carryforwards and the reversal of $28.7 million on associated deferred tax liabilities. The estimated tax impacts related to the Transaction are subject to change based on the final calculations of the tax basis of assets as well as actual results related to ongoing 2020 activity in the U.S. Such changes could be significant.
(C)The unaudited pro forma condensed consolidated balance sheet as of September 30, 2020 reflects the following pro forma adjustment related to the Estimated Required Debt Repayment. The pro forma adjustment includes the effect of an estimated mandatory repayment of approximately $275.8 million of the Senior Secured Term Loan Facility due February 2027 and an estimated mandatory payment of $188.7 million of the New Senior Secured Term Loan Facility due February 2027. The repayment results in the recognition of an $8.8 million loss on extinguishment of debt, which includes the write-off of $2.8 million of unamortized deferred financing costs and $6.0 million of original issue discount.
(D)The divestiture of the Performance Materials business columns on the unaudited pro forma condensed consolidated statements of income represent the historical financial results directly attributable to the Performance Materials business and the interest expense associated with the Estimated Required Debt Repayment, in accordance with ASC 205-20.
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