Add On Systems Inc
- Kevin CampbellCo-founder · Company website
- Kent HildrethCo-founder · Company website
Employees over time
▼ 5% since 2020Show as table
| Year | Source | Employees | Est. revenue |
|---|---|---|---|
| 2020 | Form 5500 | 20 | $4.7M |
| 2021 | Form 5500 | 22 | $5.1M |
| 2022 | Form 5500 | 24 | $5.6M |
| 2023 | Form 5500 | 20 | $4.7M |
| 2024 | Form 5500 | 18 | $4.2M |
| 2025 | Form 5500 | 19 | $4.4M |
Participants are employees in the company's retirement plan at year end, from its Form 5500 filing with the Department of Labor. They usually run a little under total headcount (part-timers and new hires may not be eligible). Revenue and EBITDA apply this industry's revenue per employee and margin to each year's count.
What we know
Compared with similar businesses nearby
| Business | Est. revenue | Distance |
|---|---|---|
| Add On Systems Inc this business | — | — |
| SOLUTIONS-101 LLC Oklahoma City · 7 employees | $2.6M | 1.5 mi |
| UPWARD ASSETS LLC Oklahoma City · 4 employees | $1.3M | 1.5 mi |
| All Star Computer Svc Oklahoma City | $2.0M | 1.7 mi |
| PRAGMA RESOURCES, LLC Oklahoma City · 1 employees | $444K | 2.1 mi |
| GLOBEONE LLC Oklahoma City · 18 employees | $5.8M | 2.1 mi |
| SHAPARD RESEARCH, LLC Oklahoma City · 6 employees | $2.4M | 2.1 mi |
The full calculation
| Revenue range | — – — |
| EBITDA range | — – — |
| Industry (NAICS) | Custom Computer Programming Services (541511) |
Benchmarks: US Economic Census 2022, OK. PPP loans were sized on 2019–2020 payroll, so figures reflect that period. These are statistical estimates, not reported financials. Listing details come from Overture Maps open data. Full methodology
History & advisors
“Add On Systems (AOS) began in January 1993 with Hugh Fish, Kevin Campbell, and Kent Hildreth.”
From the company's own website and public filings (DOL Form 5500, IRS Form 990, SBA). Roles are as stated there and may be out of date.
Public records
Matched to this business by name and address from public government data; a match can occasionally be wrong.
About Add On Systems Inc
Add On Systems Inc is an it & software company in Oklahoma City, Oklahoma, in business since 1993. It is owned by Hugh Fish (Co-founder). It is a location of ADD ON SYSTEMS, LLC. It has about 19 employees.
Common questions
- Who owns Add On Systems Inc?
- Add On Systems Inc is owned by Hugh Fish (Co-founder), according to public sources such as the company's website or filings.
- How many employees does Add On Systems Inc have?
- About 19, from its 2025 retirement-plan filing.
- When was Add On Systems Inc founded?
- Add On Systems Inc has been in business since 1993.