Mike Mathias
Analyst · JPMorgan
Thanks, Michael. Good afternoon, everyone. I'll start by saying we are obviously extremely pleased with the first quarter, during which we hit a number of all-time highs and milestones. Results were well ahead of our expectations across the board. Our strategies are clearly working, and we're making great progress on our Real Power. Real Growth plan. This performance reflects a few major factors. Our brands are strong and our merchandises in demand, fueling very healthy sales and KPIs. Our inventory optimization initiatives are working, resulting in lower promotions and significant growth in our merchandise margin. Both of our selling channels are delivering positive results. And our investments in our supply chain capabilities are effectively supporting our growth. These factors, plus a favorable environment led to record first quarter performance, revenue of over $1 billion and operating income of $133 million marked all-time highs for the company.
Demand for Aerie continues at a rapid pace, driving significantly higher sales, margins and profitability. American Eagle saw slight top line growth and experienced one of the brand's highest merchandise margin rates on record with more runway ahead.
As Judy mentioned, I will review first quarter 2021 against the same period in 2019. Consolidated first quarter net revenue increased 17%. Across brands and channels, sales metrics were exceptionally strong, with our average unit retail up over 20%, fueling a healthy transaction value. Conversion rates across channels were also favorable. Digital revenue rose 57% with Aerie, up 158% and AE, up 20%. The strong growth reflects the benefits of our multiyear investments to capitalize on the customer migration to digital and omnichannel e-commerce.
Online sales for the quarter represented approximately 40% of our total mix, increasing significantly from 30% in the first quarter of 2019. Store revenue was flat, a nice improvement from the fourth quarter. Additionally, U.S. stores posted positive revenue in the quarter, with our stores in Canada affected more by lower traffic and store closures related to COVID-19.
At a brand level, AE revenue increased slightly to $728 million. Strong demand, lower promotions along with inventory optimization initiatives led to a record merchandise margin. AE's operating profit jumped 39% to $151 million, and the operating margin expanded 570 basis points to 20.8%. These results are a clear proof point of the margin opportunity for AE, which we reviewed back in January. While the quarter showed great progress, the work continues. Jen reviewed the progress on the product side, and we still have opportunities to maximize inventory productivity.
Aerie had another standout quarter with growth accelerating. Revenue increased 89% to $297 million. Operating income hit $70 million, rising over 700%. The operating margin expanded to 23.5% from 5.3% in 2019. As I've highlighted quite a few times now, Aerie is at an inflection point in its growth trajectory. We'll continue to realize significant flow-through of incremental sales to the bottom line.
Total consolidated AEO gross profit dollars were up $111 million or 34% compared to the first quarter of 2019, and gross margin expanded 550 basis points to 42.2%. Merchandise margin expanded significantly, reflecting continued promotional discipline and benefits from our inventory optimization initiatives. Our product assortments were well received, which enabled higher full-price selling. Rent dollars were lower and levered significantly as a result of negotiated savings, store closures and benefits from impairments. Offsetting this, we saw higher delivery, distribution and warehousing costs as well as higher incentive compensation. SG&A leveraged 40 basis points as a rate of sales. The dollar increase of $34 million from first quarter 2019 was due to compensation in line with our performance-based incentive program, an increase in corporate salaries and higher variable selling expenses, partly offset by lower travel expense.
Operating income of $133 million increased 170% compared to $49 million and adjusted operating income in the first quarter 2019. The operating margin at 12.9% expanded 730 basis points, marking a 14-year high for the company. Corporate unallocated expense increased 29% to $88 million, primarily due to incentive compensation. As a result of historically higher profit delivered this quarter, incentive accruals are higher than normal and up against the minimal accrual in 2019. Adjusted EPS was $0.48 per share in the quarter, marking a record first quarter outcome for us. Our diluted share count was 207 million, and included 34 million shares of unrealized dilution associated with our convertible notes. Ending inventory was up 2% compared to the end of the first quarter of fiscal 2019. American Eagle inventory was down 15% due to continued inventory, optimization initiatives and a significantly reduced clearance level. Aerie's inventory increased approximately 50% versus 2019, supporting the strong sales growth, new stores and product expansion, including OFFLINE by Aerie. Across brands, inventory is well positioned and below current demand levels. As Michael said, we're comfortable with our ability to receive good to our supply chain and have successfully taped into strong items.
I'm very pleased with our liquidity and the health of our balance sheet. We ended the quarter with $792 million in cash and short-term investments. Even excluding proceeds from the convertible bond issuance, our liquid cash balance is up $36 million versus 2019. Capital expenditures totaled $37 million in the quarter. For 2021, we continue to expect capital expenditures at $250 million to $275 million, in line with the average annual target we shared at our investor meeting. We expect us to be back half loaded given the timing of Aerie and OFFLINE new store openings.
Regarding our store fleet, we are pleased with the transfer rates of recently closed locations and continue to expect incremental closures this year. We've had productive negotiations with landlords who have continued to secure lower rents and build flexibility into the portfolio. The vast majority of our 2020 renewals were short term, resulting in almost 450 leases coming to term in 2021. This year, we plan to open approximately 60 Aerie stores and over 30 OFFLINE by Aerie stores, which will be a mix of stand-alone an Aerie side-by-side locations.
Now as we look ahead, we are encouraged by our continued trend early in the second quarter. Both brands continue on a healthy pace. There's still uncertainty ahead. But as we reflect on our 2023 targets provided back in January of $5.5 billion in revenue and $550 million in operating profit, we believe we are on pace to achieve the profit goals this year. Obviously, well ahead of expectations. We're excited about this prospect and what it could imply for our future profitability as we continue to implement and execute on our long-term growth strategies.
As a reminder, our reported second quarter 2019 results included a $40 million benefit to revenue and $38 million benefit to operating profit from the termination of our licensing partnership with a third party operator in Japan. We're extremely pleased with the speed and success with which we are putting our Real Power. Real Growth plan into action. As I said back in January, I believe we're headed to the most exciting period in our history. Our brands are stronger than ever, our business model is sound and our first quarter results bear testament to the quality of our strategy and strength of our execution.
With that, we'll open it up for questions.