SAN ANTONIO — Ask which company is the “biggest” in North San Antonio and you’ll get two different answers depending on how you count. By employees, the leaders are the institutions that quietly move tens of thousands of people to work each day — an insurer, two school districts and a medical district. By market value, one energy company towers over everything else.
The Biggest by Headcount
No private employer looms larger than USAA. The insurance and financial-services giant employs roughly 37,000 people companywide, the bulk of them at its 286-acre headquarters along Fredericksburg Road on the Northwest Side — long one of San Antonio’s largest private employers, though it has trimmed staff through several rounds of layoffs recently.
The school districts are close behind, among the largest employers of any kind here. Northside ISD, headquartered on the Northwest Side and the fourth-largest district in Texas, employs about 12,900 people and educates nearly 95,000 students. North East ISD, serving much of the north and northeast, adds roughly 8,000 more.
The South Texas Medical Center — the dense Northwest Side cluster of hospitals and research institutions including Methodist Healthcare, University Health and UT Health San Antonio — collectively employs tens of thousands, one of the region’s most concentrated job centers.
Refiner Valero Energy, headquartered in north San Antonio, employs about 9,900 companywide, while Rackspace Technology, the cloud-computing firm based in nearby Windcrest, rounds out the North Side’s notable private employers.
The Biggest by Market Value
By market capitalization, the picture changes entirely, and one name dominates: Valero Energy (NYSE: VLO), worth roughly $70.5 billion as of late April 2026. One of the world’s largest independent refiners, Valero ranked No. 397 on Forbes’ 2025 Global 2000 — far and away the most valuable company headquartered in the San Antonio area.
After Valero, the drop-off is steep. Cullen/Frost Bankers (NYSE: CFR), parent of Frost Bank, carried a market cap near $8.8 billion in spring 2026 — though its headquarters sits downtown, not up north. Smaller public firms like iHeartMedia and Rackspace are valued around $1 billion or less, with Rackspace’s stock swinging widely through 2026.
The Giants With No Market Cap
Two of the region’s most important employers appear on no market-cap ranking at all. USAA is member-owned, not publicly traded, so it has no stock despite its enormous payroll. H-E-B, the largest private employer in Texas with about 145,000 workers statewide, is privately held by the Butt family — though its offices are downtown and on the near South Side rather than up north.
Why It Matters
The split captures North San Antonio’s economy: its day-to-day employment rests on stable, recession-resistant institutions — insurance, education, health care — while its financial firepower concentrates in a single energy company whose value rivals every other local public firm combined. For residents, that mix has meant steady job growth and relative insulation from boom-and-bust cycles — even as traffic, housing prices and competition for talent keep climbing.
A note on the numbers: employee figures are companywide unless noted and reflect the most recent available reporting; market capitalizations fluctuate daily and are shown as of spring 2026. Sources include company filings, Forbes’ Global 2000, the Texas Education Agency and market-data providers.