UNITED STATES SECURITIES AND EXCHANGE COMMISSION For the Transition Period from to Commission File No. 001-36567 Westlake Chemical Partners LP Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (Exact name of registrant as specified in its charter) Delaware 32-0436529 (State or other jurisdiction of ...

Financial Data and Key Metrics Changes - Westlake Partners reported a net income of $15 million or $0.41 per unit for Q2 2025, which is consistent with Q2 2024 net income [6][8] - Consolidated net income, including OpCo's earnings, was $86 million, benefiting from a $14 million protection from the ethylene sales agreement [7][8] - Distributable cash flow decreased to $15 million or $0.43 per unit, down by $2 million compared to 2024 due to higher maintenance capital expenditures [8][9] - The partnership maintained a strong cash balance of $81 million and a long-term debt of $400 million, with a consolidated leverage ratio of approximately one time [9][10] Business Line Data and Key Metrics Changes - The stability of cash flow is attributed to the fixed margin ethylene sales agreement, which minimizes market volatility and production risks [6][12] - The successful completion of the PetroR1 turnaround positions the partnership for solid earnings and cash flows in the future [11][12] Market Data and Key Metrics Changes - Global industrial and manufacturing activity has been soft in 2025, impacting the global chemical industry [11] - The ethylene sales agreement provides a predictable fee-based cash flow structure, insulating the partnership from market fluctuations [12] Company Strategy and Development Direction - The company plans to evaluate growth opportunities through four levers: increasing ownership interest in OpCo, acquiring other qualified income streams, organic growth through facility expansions, and negotiating higher fixed margins in the ethylene sales agreement [12] - The focus remains on providing long-term value and distributions to unitholders while maintaining safe operations and environmental stewardship [12] Management's Comments on Operating Environment and Future Outlook - Management noted that despite the challenging macroeconomic backdrop, financial performance and distributions will continue to be supported by the ethylene sales agreement [11][12] - There is no immediate need for Westlake Corporation to raise equity capital, indicating a stable financial position [18] Other Important Information - The partnership has made 44 consecutive quarterly distributions since its IPO in July 2014, with a 71% increase in distributions since the original minimum quarterly distribution [9][10] Q&A Session Summary Question: Will the outage impact from Q2 affect OpCo assets in Q3? - Management confirmed that the ethylene unit was not affected by the outage and is running reliably post-turnaround [17] Question: Are certain growth opportunities more appealing in the current environment? - Management indicated that there is no immediate need for capital, and the markets have contracted, making it unlikely to raise equity capital in the current year [18]

EXHIBIT 99.1 WESTLAKE CHEMICAL PARTNERS LP Contact—(713) 585-2900 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Chemical Partners LP Announces Second Quarter 2025 Results • Declared quarterly distribution of $0.4714 per unit; 44 consecutive quarterly distribution th HOUSTON--(BUSINESS WIRE)--Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") today reported net income attributable to the Partnership in the second quarter of 2025 of $14.6 million, or $0.41 per limited partner unit, ...

Westlake Chemical Partners LP (NYSE: WLKP ) trades at $22.05 per share. The market currently has a very pessimistic view of Westlake and has overly focused on a temporary operational downturn and has not shown enoughHi, I’m a passionate individual investor with a Bachelor of Commerce and a deep interest in the stock market, business strategy, and long-term wealth creation. My investing journey started out of curiosity and a desire to understand how companies grow, evolve, and survive through economic ups an ...

Financial Performance - Total net sales for the three months ended March 31, 2025, were $237.629 million, a decrease of 16.5% compared to $284.673 million for the same period in 2024[10] - Gross profit for the first quarter of 2025 was $54.081 million, down 47% from $102.180 million in the first quarter of 2024[10] - Net income attributable to Westlake Chemical Partners LP for Q1 2025 was $4.948 million, a decline of 66.7% from $14.833 million in Q1 2024[10] - The Partnership's net income attributable for the three months ended March 31, 2025, was $4,948,000, a decrease of 66.7% compared to $14,833,000 for the same period in 2024[40] - For the three months ended March 31, 2025, net income was $42,309, a decrease of 52.8% compared to $89,646 for the same period in 2024[83] Cash and Liquidity - Cash and cash equivalents decreased to $49.624 million as of March 31, 2025, from $58.316 million at the end of 2024, representing a decline of 14.5%[18] - The company reported a net cash provided by operating activities of $45.781 million for Q1 2025, down from $104.565 million in Q1 2024, a decrease of 56.3%[18] - Distributions to unitholders for the first quarter of 2025 totaled $16.611 million, compared to $16.607 million in the same period of 2024, showing a marginal increase[18] - The Partnership's distribution in excess of net income for the three months ended March 31, 2025, was $11,663,000, compared to $1,774,000 for the same period in 2024, indicating a significant increase in distribution pressure[40] Assets and Liabilities - Total assets increased to $1.371 billion as of March 31, 2025, compared to $1.288 billion at the end of 2024, reflecting a growth of 6.4%[8] - Total liabilities rose to $568.246 million as of March 31, 2025, up from $458.642 million at the end of 2024, indicating a 24% increase[8] - The Partnership's total equity decreased to $803.1 million as of March 31, 2025, from $829.3 million at the end of 2024, a decline of 3.2%[8] - Accrued and other liabilities increased significantly to $63,336 as of March 31, 2025, from $16,920 as of December 31, 2024[75] Accounts Receivable and Inventory - Accounts receivable from trade customers increased to $13,310,000 as of March 31, 2025, from $11,757,000 as of December 31, 2024, representing a growth of 13.2%[33] - Total inventories decreased to $2,733,000 as of March 31, 2025, down from $4,058,000 as of December 31, 2024, indicating a decline of 32.7%[34] - Accounts receivable from Westlake rose to $55,051 as of March 31, 2025, compared to $31,975 as of December 31, 2024, indicating a significant increase of 72.5%[59] Related Party Transactions - Sales to related parties (Westlake) for the three months ended March 31, 2025, were $190,781,000, down 19.0% from $235,209,000 in 2024[49] - Charges for feedstock purchased from Westlake included in cost of sales were $85,499,000 for the three months ended March 31, 2025, compared to $78,537,000 in 2024, reflecting an increase of 8.3%[50] - Interest expense related to debt payable to Westlake decreased to $5,537 for the three months ended March 31, 2025, from $6,581 in 2024, a reduction of 15.9%[65] - Operating lease rentals paid to Westlake were $338 for the three months ended March 31, 2025, down from $425 in 2024, a decrease of 20.5%[62] Operational Focus - The company plans to continue focusing on the development of ethylene production facilities and related assets to enhance operational efficiency and market presence[22]

Financial Data and Key Metrics Changes - Westlake Partners reported a net income of $5 million or $0.14 per unit for Q1 2025, which is $10 million lower than Q1 2024 due to lower production and sales volume from the planned turnaround at Petro one [6][7] - Consolidated net income, including OpCo's earnings, was $42 million on consolidated net sales of $238 million [7] - Distributable cash flow for the quarter was $5 million or $0.13 per unit, a decrease of $12 million compared to Q1 2024 [7][8] Business Line Data and Key Metrics Changes - The planned turnaround at the Petro one ethylene unit in Lake Charles, Louisiana, resulted in lower production and sales volume, impacting overall earnings [6][7] - The partnership maintained a strong leverage ratio of approximately one times, with long-term debt at $400 million [8] Market Data and Key Metrics Changes - The company noted that global trade tensions have intensified, creating uncertainty for businesses and investors, which may lead to market volatility [10][11] Company Strategy and Development Direction - The company plans to evaluate growth opportunities through increasing ownership interest in OpCo, acquiring other qualified income streams, and organic growth opportunities such as facility expansions [11] - The ethylene sales agreement provides a predictable fee-based cash flow structure, supporting financial performance and distributions [10][11] Management's Comments on Operating Environment and Future Outlook - Management expressed confidence in the stability of cash flows due to the fixed margin ethylene sales agreement, which mitigates market volatility [6][10] - The company anticipates solid production levels following the successful completion of the Petro one turnaround [10] Other Important Information - The partnership has maintained a cumulative distribution coverage ratio of approximately 1.1 times since its IPO in 2014, with 43 consecutive quarterly distributions [8][9] - The first quarter distribution of $0.04 per unit will be paid on May 29, 2025 [9] Q&A Session Summary Question: The financial impact of the Q1 turnaround at TETRA one seems significant. Can you explain? - Management indicated that the impact was as planned, with the unit down for February and March, and elevated interest rates may also be a factor affecting financial performance [15][16] Question: Is there still enough valuation difference to justify keeping Westlake healthy around? - Management noted that while the parent company has seen some valuation compression, the value proposition remains strong over the business cycle [17][18]

Financial Data and Key Metrics Changes - Westlake Partners reported a net income of $5 million or $0.14 per unit for Q1 2025, which is $10 million lower than Q1 2024 due to lower production and sales volume from the planned turnaround at Petro one [6][7] - Consolidated net income, including OpCo's earnings, was $42 million on consolidated net sales of $238 million [7] - Distributable cash flow for the quarter was $5 million or $0.13 per unit, a decrease of $12 million compared to Q1 2024 [7][8] Business Line Data and Key Metrics Changes - The planned turnaround at the Petro one ethylene unit in Lake Charles, Louisiana, resulted in lower production and sales volume, impacting overall earnings [6][7] - The partnership maintained a strong leverage ratio of approximately one times, with long-term debt at $400 million [8] Market Data and Key Metrics Changes - The partnership's predictable fee-based cash flow structure continues to provide stability amid global trade tensions and market volatility [10][11] - The ethylene sales agreement with Westlake ensures predictable cash flows, covering 95% of OpCo's production [10][11] Company Strategy and Development Direction - The company plans to evaluate growth opportunities through increasing ownership interest in OpCo, acquiring other qualified income streams, and organic growth through facility expansions [11] - The focus remains on providing long-term value and distributions to unitholders while maintaining safe operations and environmental stewardship [11] Management's Comments on Operating Environment and Future Outlook - Management acknowledged intensified global trade tensions creating uncertainty but emphasized the stability provided by the ethylene sales agreement [10] - The successful completion of the Petro one turnaround positions the company for solid production levels in the future [10][11] Other Important Information - The partnership has maintained 43 consecutive quarterly distributions since its IPO in July 2014, with a cumulative distribution coverage ratio of approximately 1.1 times [8][9] - The first quarter distribution of $0.04 per unit will be paid on May 29, 2025, to unitholders of record on May 13, 2025 [9] Q&A Session Summary Question: Financial impact of the Q1 turnaround at TETRA one - Management indicated that the impact was as planned, with the unit down for February and March, and elevated interest rates may have affected loan obligations [15][16] Question: Evaluation difference between Westlake and Westlake LP - Management noted that while the parent company has seen valuation compression, the value proposition remains strong over the business cycle, and the valuation differential remains elevated [17][18]

Financial Data and Key Metrics Changes - Westlake Partners reported a net income of $5 million or $0.14 per unit for Q1 2025, which is $10 million lower than Q1 2024 due to lower production and sales volume from the planned turnaround at Petro one [6][8] - Consolidated net income, including OpCo's earnings, was $42 million on consolidated net sales of $238 million [8] - Distributable cash flow for the quarter was $5 million or $0.13 per unit, a decrease of $12 million compared to Q1 2024 [8][10] Business Line Data and Key Metrics Changes - The planned turnaround at the Petro one ethylene unit in Lake Charles, Louisiana, resulted in lower production and sales volume, impacting overall earnings [6][8] - The partnership maintained a strong leverage ratio of approximately one times, with long-term debt at $400 million [9] Market Data and Key Metrics Changes - The company noted that global trade tensions have intensified, creating uncertainty for businesses and investors, which may lead to market volatility [11] - The ethylene sales agreement provides a predictable fee-based cash flow structure, supporting financial performance despite market conditions [11] Company Strategy and Development Direction - The company plans to evaluate growth opportunities through increasing ownership interest in OpCo, acquisitions of other income streams, and organic growth through facility expansions [12] - The focus remains on maintaining a strong balance sheet and conservative financial metrics while providing long-term value and distributions to unitholders [12] Management's Comments on Operating Environment and Future Outlook - Management expressed confidence in the stability of cash flows due to the fixed margin ethylene sales agreement, which mitigates market volatility [6][11] - The successful completion of the Petro one turnaround positions the company for solid production levels in the future [12] Other Important Information - The partnership has made 43 consecutive quarterly distributions since its IPO in July 2014, with a cumulative distribution coverage ratio of approximately 1.1 times [10][12] - The first quarter distribution of $0.04 per unit will be paid on May 29, 2025 [10] Q&A Session Summary Question: The financial impact of the Q1 turnaround at TETRA one seems significant. Can you explain? - Management indicated that the impact was as planned, with the unit down for February and March, and elevated interest rates may have also affected performance [17][18] Question: Is there still enough valuation difference to justify keeping Westlake healthy around? - Management noted that while the parent company has seen some valuation compression, the value proposition remains strong over the business cycle [19][20]

EXHIBIT 99.1 WESTLAKE CHEMICAL PARTNERS LP Contact—(713) 585-2900 Investors—Steve Bender Media—L. Benjamin Ederington Westlake Chemical Partners LP Announces First Quarter 2025 Results • Declared quarterly distribution of $0.4714 per unit; 43 consecutive quarterly distribution rd HOUSTON--(BUSINESS WIRE)--Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") today reported net income attributable to the Partnership in the first quarter of 2025 of $4.9 million, or $0.14 per limited partner unit, whi ...

Westlake Chemical Partners (WLKP) shares soared 5.1% in the last trading session to close at $22.71. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 9.1% loss over the past four weeks.WLKP’s rally is driven by a surge in material stocks after President Trump announced he would pause reciprocal tariffs for 90 days for most countries.This ethylene producer is expected to post quarterly earnings of $0.38 per share in its upcoming re ...