Good morning, and thank you for joining Greif's fiscal first quarter 2026 earnings conference call. Today, our CEO, Ole Rosgaard, will provide a strategy and market update, followed by our CFO, Larry Hilsheimer, with a review of our financial results. Please turn to slide two. In accordance with Regulation Fair Disclosure, please ask questions regarding topics you consider important because we are prohibited from discussing material, non-public information with you on an individual basis. During today's call, we will make forward-looking statements involving plans, expectations, and beliefs related to future events. Actual results could differ materially from those discussed. Additionally, we will be referencing certain non-GAAP financial measures and the reconciliation to the most directly comparable GAAP metrics that can be found in the appendix of today's presentation. I'll now turn the call over to Ole on slide three.
Thank you, Bill, and thank you all for joining us today. We entered 2026 from a position of strength, despite a still muted industrial backdrop. Our Q1 performance demonstrates the progress we are making on two critical fronts, delivering solid financial results in the present, while also making progress on our longer-term Build to Last strategy. During the quarter, volumes performed as anticipated, remaining in line with expectations due to continued softness in the industrial economy. Our EBITDA margin profile continues to improve meaningfully, up 260 basis points year-over-year, which is the result of decisive actions taken on our cost optimization. As a result, adjusted EBITDA increased 24% versus prior year, and our results came in as expected. Based on this performance, we are reaffirming our 2026 guidance.
Following the portfolio rationalization we undertook in 2025, our leverage is now historically low, enabling significant capital flexibility to create shareholder value. In Q1, we completed $130 million of the $150 million share repurchase program we announced three months ago. Given our strong free cash flow projection for the year with a conversion ratio of 50%, we fully anticipate remaining well below a leverage of 2 times. Our strong free cash flow generation and balance sheet strength allows us to fund value-creative organic growth, including growth CapEx in our existing operations and higher return end markets. As we drive growth externally, we are also accelerating internal transformation.
Our run rate cost optimization is now at $65 million, which reflects primarily SG&A actions taken early in fiscal 2026, which will benefit EBITDA for the majority of the year, as contemplated in our original guidance. As a reminder, our fiscal 2026 year-end run rate commitment is $80 million-$90 million. We are confident in the progress we are making, and we believe we are demonstrating our ability to manage the present while continuing to shape the future. Please turn to slide four. Our end market performance reflects the reality of broader economic conditions remaining soft. In Customized Polymer Solutions, demand was essentially flat overall. IBC volumes were up low singles, small containers down low singles, and large containers down mid-single digits due to continued industrial softness.
This is consistent with our expectations heading into the year, and we expect small containers to sequentially improve into Q2 as ag seasonality picks up. Durable Metal Solutions remained under pressure with softness across regions, especially with chemical customers. We continue to focus this business on cost discipline and cash generation. Sustainable Fiber Solutions saw volume declines in converting due to North America industrial softness, but the mills ran at solid operating rates throughout the quarter. Innovative Closure Solutions volumes declined high singles from growth from both metal and polymer closure demands, driven by the industrial softness I just spoke on. Importantly, total sales, which reflects sales both direct to third parties and sold through our Polymers and Metals businesses, were approximately flat due to strong price mix, with volume down only mid-singles. This shows that our highest performing products remained the most resilient in the quarter.
Overall, Q1 performance was consistent with our expectations and reflects our ability to improve margins through disciplined execution, even in a muted industrial environment. With that context, I'll turn it over to Larry to walk through the financials on slide five.
Thank you, Ole, and hello, everyone. Adjusted EBITDA for the quarter increased 24%, and margins improved 260 basis points to 12.3%, reflecting improved price cost and the significant benefit of structural cost optimization. While Q1 adjusted free cash flow was lower year-over-year, this is primarily due to the inclusion in the prior year of cash flow from recently divested businesses. Excluding that impact, the core cash engine and continuing operations improved year-over-year, supported by EBITDA growth, lower interest expense following deleveraging, and reduced maintenance capital post our containerboard sale. As we discussed last quarter, Q1 is seasonally the lowest quarter for free cash flow, and we have full confidence in our full year low-end adjusted free cash flow guidance of $315 million and approximate 50% conversion expectation.
Our earnings strength showed in our earnings per share results, up 140% year-over-year, driven by higher EBITDA, lower interest expense, despite year-over-year increased tax expense. Please turn to slide six. In Customized Polymers, gross profit was down on approximately flat volumes due to primarily product mix, despite cost optimization gains. Durable Metals gross profit was slightly up and improved year-over-year, primarily from structural cost optimization. Fiber sales were impacted by the demand softness we anticipated and discussed during our Q4 call. Margins, however, expanded year-over-year, driven by cost discipline and favorable year-over-year pricing and OCC costs. Innovative Closure sales is presented as total sales to properly reflect the margin profile, as gross profit reflects profitability of both direct external sales and external sales sold through the Metals or Polymers businesses.
Net sales does not include the external sales sold through the Metals and Polymers businesses. Total sales were roughly flat year-over-year, but gross profit was up due to strong mix and continued benefits from our cost optimization. Please turn to slide seven. We are reaffirming our low-end 2026 guidance of $630 million in adjusted EBITDA and $315 million in adjusted free cash flow. As discussed in Q4, this guidance reflects significant structural cost optimization, year-over-year price cost changes in Fiber, as reflected in RISI as of our Q4 call, and net flat volumes for the full year. Our Q1 results came in largely consistent with our guidance expectations. Price and raw material costs were slightly better than planned, volumes and manufacturing costs slightly behind, and SG&A in line.
No individual bucket changed with material, and the net impact of all these elements was consistent to our expectation, giving us confidence in reaffirming guidance. Please turn to slide eight. Our capital allocation framework remains focused on pursuing margin-accretive organic growth and delivering high return on invested capital. Our leverage is historically low, and our maintenance CapEx needs are significantly reduced from last year, both of which free up capacity to pursue high return organic growth investments. We intend to continue to increase our dividend over time and have nearly completed the $150 million share repurchase program we announced last quarter. We continue to believe our stock is still one of the most compelling value propositions we can invest in, and as such, in December, our board approved a new $300 million share repurchase authorization.
We will execute on this new authorization in a disciplined manner, incorporating repurchases as part of our ongoing and balanced capital allocation, with a goal to repurchase up to 2% of our shares outstanding annually. As Ole mentioned, we can achieve these goals while still remaining well below our 2 times leverage. That balance sheet strength and our strong free cash flow generation allow us to accelerate organic investment, funding growth CapEx within our existing operations and higher return, higher return end markets, even in a muted macro environment. Please turn to slide nine for closing remarks from Ole.
Thanks, Larry. As we look ahead, we remain grounded in the realities of a still cautious demand environment, but we're not standing still. We're executing on cost, on capital, and on strategy. The work we've done to transform Greif is not cyclical, it's structural, and it shows how we perform, how we invest, and how we allocate capital. My sincere thanks to our colleagues all around the world for driving this transformation with me. We remain focused on managing the present while also building the next, next era of durable value creation for Greif. Thank you for your support. Operator, please open the lines for questions.