Karl McDonnell
Analyst · BMO Capital Markets
Thank you, Terese, and good morning, everyone. Our first quarter 2024 results reflect continued strength across all of our segments. And before we begin, and as is normally the case, I'd like to start by pointing out that all of my references to our financial results are to our adjusted results, and they assume a constant currency for foreign exchange purposes.
For the first quarter, our revenue grew 14% to $292 million. Our operating expenses grew 3%, which was in line with our expectations and our operating income grew by more than 4x to $36 million. Our operating margin increased 910 basis points. And during the quarter, we generated an incremental $28 million of operating income from $36 million of incremental revenue. That 78% marginal contribution is a bit more than we would normally expect and it reflects the fact that many of our planned investments this year are time to occur in the second half of the year to support our growth initiatives for 2025. During the quarter, we generated $1.11 earnings per share, which was more than a 350% increase.
Turning now to our segments. U.S. Higher Education delivered another quarter of strong growth driven once again by employer affiliated enrollment. Total enrollment in U.S. higher education for the first quarter grew 10% with total employer affiliated enrollment growing more than double that rate at 22% from the prior year, reflecting continued strength in our corporate partnerships.
During the quarter, the percentage of total U.S. Higher Education enrollment coming from our corporate partnerships increased 300 basis points to 29%. Student retention at U.S. Higher Education remained stable at 87%. In the first quarter, U.S. Higher Education revenue grew 11% and operating income grew 192% from the prior year.
Our Education, Technology & Services segment also continue to see strength with both Sophia and Workforce Edge continuing to gain market share. In the first quarter, ETS revenue grew 30% and operating income increased 74% from the prior year. Sophia Learning, our direct-to-consumer portal of college level classes grew its revenue in the first quarter by 45% and generated a 51% operating margin which is up from 44% in the prior year.
Average total paid subscribers grew 42% to more than 39,000 paid subscribers. Workforce Edge now has 68 corporate partners who collectively employ approximately 1.5 million employees. Workforce Edge enrollments into either Strayer or Capella University grew 62% to approximately 1,600 students. Our Australia, New Zealand segment returned to total enrollment growth in the first quarter with enrollment increasing 5% from the prior year to 2,197 students.
In the first quarter, revenue on a constant currency basis grew 19% from the prior year, driven by higher enrollment and revenue per student. The higher enrollment was driven by onshore international enrollment, meaning international students already in Australia that either reenrolled or transferred to Torrens University during the quarter. Increased course load contributed to a 14% increase in revenue per student, which, as we've previously noted, is partly due to the resumption of the Australian requirement for international students to take more courses on campus.
On a constant currency basis, loss from operations was $2.2 million in the first quarter, improving from loss from operations of $7.2 million in the prior year. As we've noted before, ANZ first quarter revenue is the low point in the year due to relatively fewer instructional days during the quarter as it's the Australian summer. Our expenses, on the other hand, are incurred somewhat evenly throughout the year.
In closing, we are very pleased with our continued momentum across our business and are working towards a successful 2024. And once again, I'd like to thank all of my colleagues within SEI for your ongoing commitment to our students. And with that, Jonathan, we'd be happy to take questions.