Companies in San Diego: the headquarters, the employers and the 93,407 businesses behind them

This page is for anyone who needs a usable picture of the companies in San Diego: job seekers comparing employers, buyers checking a local supplier, founders sizing a market, and B2B sellers deciding which accounts to work. It covers the headquarters people ask about first, the employers the state lists as the county's largest, the full business count from federal data, and the local records that let you check any one company.

The biggest companies headquartered in San Diego

San Diego County is a single-county metro area (San Diego-Chula Vista-Carlsbad, CBSA 41740), so "San Diego" here means the whole county, from Carlsbad to Chula Vista. These are the ten largest SEC-registered public companies whose latest annual report names a principal executive office in the county, ranked by the revenue in that filing.

PriceSmart and ResMed filed new 10-Ks in 2026, so their figures are for the fiscal years ended August 2026 and June 2026. The ranking to 25, with headcounts, is on our largest companies in San Diego page, and Qualcomm's workforce history is on the Qualcomm employees page.

Three corrections to lists you'll find elsewhere. Kratos Defense & Security Solutions still has a San Diego business address in the SEC's records, but its 10-K for 2025 names 1 Chisholm Trail, Round Rock, Texas as its principal executive office. Guild Holdings, the San Diego mortgage lender, filed to delist in November 2025 and deregistered in December 2025, so it no longer publishes results. And Axos Financial, often listed as a San Diego bank, gives Las Vegas as its headquarters.

San Diego's largest employers

The California Employment Development Department (EDD), the state's labor market information office, publishes a list of major employers for each county, extracted from the America's Labor Market Information System Employer Database (2026 2nd edition, compiled by Data Axle). For San Diego County it lists 25 worksites, alphabetically and without headcounts. Grouped by type:

Two entries, a fitness boot camp and a small search marketing firm, are unlikely to be among the county's largest employers and probably reflect errors in the underlying business database, so treat the list as a map of large worksites rather than a ranking. The EDD also notes that a company may be listed at its headquarters even when its employees work across the state.

The federal data explains why the list leans public. In the Bureau of Labor Statistics' Quarterly Census of Employment and Wages, San Diego County averaged 1,535,067 covered jobs in 2025: 1,288,378 private (83.9%), 148,791 in local government, 50,334 in state government and 47,564 in federal civilian jobs. Active-duty military personnel aren't in those counts, so the real public share is higher.

How many businesses are in San Diego

The Census Bureau's County Business Patterns (CBP) counts every business location with paid employees. For the San Diego-Chula Vista-Carlsbad, CA Metro Area in 2023:

That's 80,797 establishments with 1 to 19 employees, 10,546 with 20 to 99 and 2,064 with 100 or more. CBP counts locations, not companies (a bank with 40 branches counts 40 times), leaves out self-employed people and businesses without employees, and measures employment in the pay period including March 12.

The city's own register shows how much CBP leaves out. The City Treasurer requires every business operating in the City of San Diego, including home-based and self-employed ones, to hold a business tax certificate, and publishes the register as open data. The active file we downloaded on 30 October 2026 (updated 29 October) had 60,276 active certificates, and 25,407 of them, 42%, belong to sole proprietors.

What kinds of companies San Diego has

The 2023 CBP figures by sector show a market weighted toward research and professional work:

Average pay is our calculation: annual payroll divided by employees. Professional, scientific and technical services, which includes research labs, engineering firms and software developers, has 17.4% of establishments and 22.7% of payroll. Manufacturing establishments average 35 employees each, more than twice the county average, because shipyards, turbine plants and device makers run large sites. For the biggest clusters, see the reports on San Diego biotech companies and San Diego defense contractors.

Looking up and checking a San Diego company

To vet a supplier, check the entity's status on bizfile, confirm it holds a city business tax certificate if it works inside city limits, and check any trade license with the relevant board before you sign. A certificate number you can't find in the city file is worth a question.

Prospecting San Diego companies

The size bands tell you who buys. At the 80,797 establishments with fewer than 20 employees, the owner decides. Between 20 and 99 employees, an office or operations manager usually runs purchasing with the owner approving large spend. At the 2,064 sites with 100 or more, buying splits by function, and at defense contractors and hospital systems you'll meet formal supplier registration and security reviews before any trial.

Illustrative example. The company, rates and results are fictional, to show the method.

Torrey Ledger (torreyledger.example), an outsourced bookkeeping firm, wants professional services firms inside the City of San Diego.

• The active certificate file has 10,519 certificates in NAICS sector 54.
• Keeping only corporations, LLCs and partnerships leaves 5,929, the firms most likely to have staff and a payroll to reconcile.
• Torrey Ledger assumes a third already have an accountant they're happy with and can't be moved this year, leaving about 3,950 accounts worth a first touch.
• At 250 contacts a month and a 1.5% conversion rate, that's about four new clients a month.

The slow part is finding the right person at each of those 3,950 firms and a reason to write now. Bebop can take a description such as "San Diego engineering and consulting firms with 10 to 50 employees that are hiring an office manager" and return matching companies with the contact and the reason each fits.

Subject: Month-end close at [Company]

Hi [first name],

I noticed [Company] is hiring for [role] in [Sorrento Valley / downtown]. When a firm adds people, month-end close is usually the first thing to slip.

We keep the books for 60 San Diego engineering and consulting firms, closing by the fifth business day each month. Would a one-page comparison of what that costs against an in-house hire be useful?

[Your name], Torrey Ledger

Next step: turn a territory into a working list with how to build a prospect list.