Maryann T. Mannen
Executive Vice President and Chief Financial Officer at Marathon Petroleum
Thanks, Mike. Moving to first quarter results. Slide 5 provides a summary of our financial results. This morning, we reported earnings per share of $6.09. Adjusted EBITDA was $5.2 billion for the quarter, and cash flow from operations excluding unfavorable working capital changes was nearly $4.2 billion. During the quarter, we returned $337 million to shareholders through dividend payments and repurchased nearly $3.2 billion of our shares.
Slide 6 shows the reconciliation between net income and adjusted EBITDA as well as the sequential change in adjusted EBITDA from fourth quarter 2022 to first quarter 2023. Adjusted EBITDA was lower sequentially by approximately $600 million. This decrease was driven by refining and marketing as refining margins per barrel were down quarter-over-quarter. As we indicated last quarter, throughputs were lower primarily due to the significant planned turnaround activity.
Corporate expenses were roughly in line with our guidance and despite general inflationary pressures, we have maintained cost discipline since taking $100 million out of corporate cost since 2020. The tax rate for the first quarter was 21%, resulting in a tax provision of approximately $800 million.
Moving to our segment results. Slide 7 provides an overview of our Refining and Marketing segment. Like many in the industry, several of our refineries were impacted by winter storm Elliott at the end of December. These impacts carried into the first quarter, reducing our crude throughput by 3 million barrels. Winter storm Elliott and higher planned maintenance in the Gulf Coast region reduced overall refining utilization, which was down 5% to 89%. Sequentially, per barrel margins were lower in all regions compared with the four quarter. Capture was 98%, reflecting a strong result from our commercial team, particularly given the extensive turnaround activity this quarter.
Refining operating costs per barrel were roughly flat sequentially in the first quarter at $5.68, lower throughput compared to the fourth quarter impacted operating cost per barrel. This was partially offset by lower energy costs, primarily in the Gulf Coast and Mid-Con regions. Although we experienced higher natural gas prices in the West Coast, we expect operating cost per barrel to be lower in the second quarter as reflected in our guidance.
Slide 8 provides an overview of our Refining and Marketing margin capture this quarter, which was 98%. Our commercial teams executed effectively in a volatile market environment. Light product margin tailwinds were balanced against impacts associated with inventory build and planned maintenance activity. Capture results will fluctuate based on market dynamics. Still, we believe through our commercial efforts, our capture baseline has moved closer to 100%.
As our strategic pillar indicates, we have been committed to improving our commercial performance and believe that the capabilities we have built over the last 18 months, we'll provide a sustainable advantage. We have meaningfully changed the way we go to market from a commercial perspective throughout our entire company. We believe these capabilities will provide incremental value beyond what we have realized to date.
Slide 9 shows the change in our Midstream adjusted EBITDA versus the fourth quarter of 2022. Our Midstream segment delivered resilient first quarter results. Adjusted EBITDA was 9% higher year-over-year, reflecting business growth. Our Midstream business continues to grow and generate strong cash flows, we are advancing our capital plan with projects anchored in the Marcellus, Permian and Bakken basins. These disciplined investments in high return projects along with our focus on cost and portfolio optimization are expected to grow our cash flows. This will allow us to reinvest in the business and return capital to unit holders.
This quarter, MPLX distributions contributed $502 million in cash flow to MPC. MPLX remains a source of durable earnings in the MPC portfolio and is a differentiator for us compared to peers without -- between businesses.
Slide 10 presents the elements of change in our consolidated cash position for the first quarter. Operating cash flow excluding changes in working capital was nearly $4.2 billion in the quarter. Working capital was a $98 million headwind for the quarter, driven primarily by increases in crude and product inventory offsetting benefits from a decrease in refined product receivable related to lower product sales. Capital expenditures and investments totaling $664 million this quarter, we saw consistent spending in refining [Phonetic] in the first quarter as work progressed on the Martinez Renewables Fuel facility conversion and the completion of the Galveston Bay STAR project.
MPC returned over $3.5 billion via share repurchases and dividends during the quarter. This represents an 85% payout of the nearly $4.2 billion of operating cash flow excluding changes in working capital, highlighting our commitment to superior shareholder returns. We now have $9 billion remaining under our current share repurchase authorization, which includes the additional $5 billion approval announced today. At the end of the first quarter, MPC had approximately $11.5 billion in cash and short-term investments.
Turning to guidance. On Slide 11, we provide our second quarter outlook, we expect crude throughput volumes of roughly 2.6 million barrels per day, representing utilization of 91%. Utilization is forecast to be higher than the first quarter level due to planned turnaround activity having a lower impact on crude unit in the second quarter. Planned turnaround expense is projected to be approximately $400 million in the quarter, with activity primarily in the Mid-Con and West Coast regions. We expect turnaround activity to be front half weighted in 2023. By the end of the second quarter, we expect to spend roughly $760 million on turnaround in 2023 and anticipate the full year turnaround spend to be comparable to the level of spend in 2022. Operating costs per barrel in the second quarter are expected to be lower at $5.20, as we expect to see benefits from higher throughput and lower energy cost. As we look further into 2023, we anticipate our operating cost per barrel would decline and trend towards a more normalized level, a $5 per barrel as we complete turnaround and project activity.
Distribution costs are expected to be approximately $1.35 billion for the second quarter. Corporate costs are expected to be $175 million representing the sustained reductions that we have made in this area.
To recap, our first quarter results reflect our team's strong operational and commercial execution across the Company. Our capital allocation framework remains consistent. We will invest in sustaining our asset base while paying a secure competitive dividend with the potential for growth. We want to grow the Company's earnings, and we will exercise strict capital discipline beyond these three priorities we are committed to returning excess capital through share repurchases to meaningfully lower our share count.
With that, let me pass it back to Mike.