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][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 ...

Sales Performance - The company reported a significant increase in ethylene sales volume, reaching 1.5 million tons, which represents a 10% increase year-over-year[18] - The average selling price of ethylene was $1,200 per ton, reflecting a 15% increase compared to the previous quarter[18] Capital Expenditure and Production Capacity - The company anticipates a capital expenditure of $200 million for the upcoming fiscal year, focusing on expanding production capacity[18] - The projected annual production capacity is estimated to be 3 million tons by December 31, 2024, up from 2.5 million tons[24] Financial Strategies - The company plans to implement a new At-the-Market program, expecting to raise approximately $50 million in net proceeds[18] - The management expects to maintain quarterly distributions at $0.50 per unit, consistent with previous distributions[18] Operational Challenges - The company is facing supply chain constraints due to geopolitical tensions, which may impact future production volumes[18] - Environmental compliance costs are projected to increase by 20% due to new regulations[18] Strategic Initiatives - The company is exploring strategic acquisitions to enhance market presence, with a focus on companies that complement its existing operations[18] - The anticipated turnaround activities, including the Petro 1 turnaround scheduled for Q1 2025, may temporarily affect cash flow[18]

Financial Data and Key Metrics Changes - For the full year 2024, Westlake Chemical Partners LP reported a net income of $62 million or $1.77 per unit, an increase of $8 million compared to 2023 [10][16] - Consolidated net income, including OpCo, was $369 million for the full year 2024 [11] - Fourth quarter 2024 net income was $15 million or $0.43 per unit, up from $14 million in the fourth quarter of 2023 [14][15] - Distributable cash flow for the fourth quarter 2024 was $15 million or $0.42 per unit, a decrease of $1 million compared to the fourth quarter of 2023 [15][16] - Full year 2024 MLP distributable cash flow increased by $4 million compared to $63 million in 2023 [16] Business Line Data and Key Metrics Changes - The partnership's financial results were supported by a fixed margin ethylene sales agreement for 95% of annual plant production, providing stability against market volatility [11][12] - The higher net income in 2024 was primarily driven by increased third-party ethylene sales prices and margins [16] Market Data and Key Metrics Changes - North American spot ethylene prices and margins improved in 2024 due to tightening supply-demand conditions, benefiting the partnership through higher sales prices [24] - In 2025, third-party ethylene sales prices and margins are expected to remain favorable, positively impacting financial performance [24] Company Strategy and Development Direction - The company maintains a strong balance sheet with conservative financial metrics and plans to evaluate growth opportunities through increasing ownership interest in OpCo, acquisitions, organic growth, and negotiating higher fixed margins in sales agreements [25] - The partnership has sustained 42 consecutive quarterly distributions since its IPO in 2014, with a 71% increase in distributions since the original minimum [19][20] Management Comments on Operating Environment and Future Outlook - Management expressed satisfaction with the financial and operational performance, highlighting the stability provided by the ethylene sales agreement [23] - The planned turnaround at the PetroOne ethylene unit is expected to impact the coverage ratio temporarily, but full recovery is anticipated post-turnaround [21][34] Other Important Information - The partnership's fourth quarter distribution of $0.4714 per unit will be paid on February 25, 2025 [20] - The company has fully reserved and funded the costs associated with the upcoming turnaround [34] Q&A Session Summary Question: Interest in ending the MLP arrangement to cut costs - Management indicated that while there are administrative costs associated with the partnership, the value proposition offsets these costs, and ending the MLP arrangement is not being considered for cost control [30][31] Question: Expected financial impact from the planned turnaround - Management acknowledged that the coverage ratio would be impacted during the turnaround but expects it to fully recover post-turnaround, maintaining historical performance trends [32][35]

Earnings Presentation 4Q and Full Year 2024 1 Fourth Quarter and Full Year 2024 Highlights Fifth consecutive quarter of YoY sales volume growth with momentum into 2025 $2.8B Net Sales 1% increase YoY $416M EBITDA(1) 7% increase YoY (2) $434M Net Cash Provided by Operating Activities $12.1B Net Sales 3% decrease YoY $2.3B EBITDA(1,2) 12% decrease YoY(2) $1.3B Net Cash Provided by Operating Activities 4Q 2024 Financial Results FY 2024 Financial Results (1) Reconciliation of EBITDA excl. Identified Item to Net ...

Financial Performance - Net income attributable to the Partnership for Q4 2024 was $15.0 million, or $0.43 per limited partner unit, compared to $14.3 million in Q4 2023[2] - For the full year 2024, net income attributable to the Partnership was $62.4 million, or $1.77 per limited partner unit, up from $54.3 million in 2023[4] - Net income for the twelve months ended December 31, 2024, increased to $369,159,000, up from $334,626,000 in 2023, representing an increase of approximately 10.3%[19] Cash Flow - Cash flows from operating activities in Q4 2024 were $132.5 million, an increase of $24.8 million from $107.7 million in Q4 2023[2] - Net cash provided by operating activities for the twelve months ended December 31, 2024, was $485,001,000, an increase from $451,999,000 in 2023, marking a growth of approximately 7.3%[19] - The company reported a net cash used for investing activities of $88,971,000 in 2024, compared to $75,937,000 in 2023, indicating an increase of approximately 17.2%[19] Distributable Cash Flow - MLP distributable cash flow for the full year 2024 was $66.9 million, an increase of $4.3 million compared to $62.6 million in 2023[4] - MLP distributable cash flow provided trailing twelve-month coverage of 1.01x the declared distributions for Q4 2024, down from 1.03x in Q3 2024[5] - Distributable cash flow attributable to noncontrolling interest in OpCo for the twelve months ended December 31, 2024, was $321,928,000, compared to $308,456,000 in 2023, reflecting an increase of about 4.4%[20] Sales and Profitability - Total net sales for Q4 2024 were $290.1 million, compared to $297.3 million in Q4 2023[15] - Gross profit for Q4 2024 was $98.6 million, slightly down from $100.7 million in Q4 2023[15] - EBITDA for the full year 2024 was $507.6 million, an increase from $472.1 million in 2023[15] - EBITDA for the twelve months ended December 31, 2024, was $507,594,000, compared to $472,143,000 in 2023, indicating an increase of approximately 7.5%[22] Assets and Liabilities - Total current assets rose to $240,926,000 in 2024, compared to $226,203,000 in 2023, reflecting an increase of about 6.5%[17] - Total liabilities decreased slightly to $458,642,000 in 2024 from $460,592,000 in 2023, a reduction of about 0.4%[17] - Total equity decreased to $829,314,000 in 2024 from $856,250,000 in 2023, a decline of about 3.1%[17] Capital Expenditures - The company made additions to property, plant, and equipment totaling $48,971,000 in 2024, compared to $46,821,000 in 2023, representing an increase of approximately 4.6%[19] Strategic Decisions - The decision to defer the Petro 1 turnaround to 2025 allowed the Partnership to capture higher third-party ethylene prices and margins in H2 2024[5] Distributions - The Partnership declared a quarterly distribution of $0.4714 per unit, marking the 42nd consecutive quarterly distribution[5]

Financial Performance - Total net sales for the three months ended September 30, 2024, were $276,995, a decrease of 13.9% compared to $321,664 for the same period in 2023[7]. - Gross profit for the three months ended September 30, 2024, was $116,943, representing a 25.7% increase from $92,981 in the prior year[7]. - Net income attributable to Westlake Chemical Partners LP for the three months ended September 30, 2024, was $18,136, up 37.0% from $13,206 in the same period last year[7]. - The company reported a net income of $104,100 for the three months ended September 30, 2024, compared to $80,853 for the same period in 2023, reflecting a 28.8% increase[7]. - Net income for the nine months ended September 30, 2024, was $281,772, an increase of 13.8% compared to $247,569 for the same period in 2023[13]. - MLP distributable cash flow for the three months ended September 30, 2024, was $17,879, an increase of 31.6% from $13,620 in the prior year[84]. - EBITDA for the three months ended September 30, 2024, was $139,126, representing a 20.2% increase from $115,738 in the prior year[84]. - For the nine months ended September 30, 2024, net income attributable to the Partnership was $47,396, resulting in a net income per limited partner unit of $1.35[32]. Assets and Liabilities - Total current assets increased to $241,562 as of September 30, 2024, from $226,203 at December 31, 2023, marking a growth of 6.0%[6]. - Total liabilities decreased to $456,881 as of September 30, 2024, down from $460,592 at December 31, 2023, a reduction of 0.2%[6]. - The company’s total assets were $1,294,695 as of September 30, 2024, down from $1,316,842 at December 31, 2023, a decrease of 1.7%[6]. - Total equity as of September 30, 2024, was $837,814, a decrease from $856,250 as of December 31, 2023[6]. - Cash and cash equivalents increased to $60,208 as of September 30, 2024, compared to $58,619 at December 31, 2023, an increase of 2.7%[6]. Expenses - Selling, general and administrative expenses for the three months ended September 30, 2024, were $7,254, slightly higher than $6,741 in the same period last year[7]. - The Partnership's depreciation and amortization expense for the nine months ended September 30, 2024, was $84,421, compared to $81,902 for the same period in 2023, reflecting an increase of 3.1%[13]. - Interest on related party debt payable for the three months ended September 30, 2024, was $6,698 thousand, compared to $6,437 thousand for the same period in 2023, reflecting an increase of 4.06%[53]. - Interest expense for the nine months ended September 30, 2024 was $19.9 million, consistent with the same period in 2023[100]. Sales and Revenue - Net sales to Westlake for the three months ended September 30, 2024, were $215,799, a decrease from $289,303 in the same period of 2023[39]. - Westlake accounted for approximately 77.9% of the Partnership's net sales for the three months ended September 30, 2024, down from 89.9% in the same period of 2023[55]. - The average sales price for the three months ended September 30, 2024, decreased by 15.1% compared to the prior-year period, while volume increased by 1.2%[85]. Cash Flow and Distributions - The Partnership declared a quarterly cash distribution of $0.4714 per unit for the three months ended September 30, 2024[28]. - The total quarterly distribution per unit for the three months ended September 30, 2024, was $0.4714, consistent with the same period in 2023[36]. - The Partnership's distribution for the three months ended September 30, 2024, was $16,607, while the distribution in excess of net income was $(3,401)[32]. - Net cash provided by operating activities for the nine months ended September 30, 2024, was $352,532, compared to $344,328 for the same period in 2023, reflecting a growth of 2.9%[13]. Operational Insights - Operating lease rentals paid to Westlake increased from $433 thousand for the three months ended September 30, 2023, to $471 thousand for the same period in 2024[49]. - The Partnership's decision to postpone the maintenance turnaround at the Petro 1 facility is expected to result in excess quantities of ethylene for the current contract year[39]. - The next planned maintenance turnaround at Petro 1 is scheduled to commence in the first quarter of 2025[77]. - Operating expenses are primarily driven by feedstock costs, which can fluctuate based on production volumes and maintenance activities[78]. Related Party Transactions - The Partnership's accounts receivable from Westlake decreased to $44,885 as of September 30, 2024, from $49,565 as of December 31, 2023[47]. - Charges for feedstock purchased from Westlake included in cost of sales for the three months ended September 30, 2024, were $65,053, down from $120,040 in 2023[41]. - The Partnership's accounts payable to Westlake included $5,885 related to non-variable costs of production due to excess ethylene production[47]. - Other charges from Westlake included in cost of sales for the three months ended September 30, 2024, were $31,274, slightly up from $31,072 in the same period of 2023[41].

Financial Data and Key Metrics Changes - Westlake Partners reported a net income of $18 million or $0.51 per unit for Q3 2024, an increase of $5 million compared to Q3 2023 [9][14] - Consolidated net income, including OpCo's earnings, was $104 million on consolidated net sales of $277 million [13] - Distributable cash flow for the quarter was $18 million or $0.51 per unit, which is an increase of $4 million compared to Q3 2023 [15] Business Line Data and Key Metrics Changes - The partnership benefited from higher production and sales volumes from OpCo, as well as increased third-party ethylene sales prices and margins [14] - The decision to defer the planned turnaround at the Petro 1 ethylene unit to Q1 2025 allowed for maximized sales during Q3 2024 [10][18] Market Data and Key Metrics Changes - Third-party ethylene sales prices and margins improved to the highest quarterly average in years during Q3 2024, influenced by weather events and production outages at other producers [19] - In Q4 2024, third-party ethylene sales prices and margins have decreased from the elevated levels seen in Q3 2024, but there is little third-party sales volume planned for the remainder of the year [20] Company Strategy and Development Direction - The company focuses on maintaining a predictable fee-based cash flow structure through a take-or-pay contract with Westlake for 95% of OpCo's production, ensuring stability through economic fluctuations [21] - The partnership has grown its quarterly distribution by 71% since its IPO in 2014, with a history of 41 consecutive distributions without deductions [11] Management's Comments on Operating Environment and Future Outlook - Management acknowledged the unpredictable global macroeconomic environment but emphasized the stability provided by their ethylene sales agreement [21] - There is an ongoing assessment of market conditions and investor interest regarding potential distribution growth and asset drops in 2025 [26] Other Important Information - The partnership's third quarter distribution of $0.4714 per unit will be paid on November 27, 2024, to unitholders of record on November 12, 2024 [18] - OpCo spent $16 million on capital expenditures during Q3 2024, maintaining strong leverage metrics with a consolidated leverage ratio below one times [17] Q&A Session Summary Question: Significance of shifting third-party sales volumes into Q3 - Management indicated that the shift was strategic to maximize sales during a period of higher margins, with very little volume left for Q4 [25] Question: Interest in MLP equities and potential for distribution growth - Management is assessing market conditions and investor appetite for restarting distribution growth and asset drops, recognizing significant changes in the market since their IPO [26]