Nonprofit · EIN 99-4817542
LMSYS CORP
Tax-exempt · SACRAMENTO, CA 95816
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $889,293 | $202,508 | $686,785 | $686,785 | $0 | $686,785 |
| December 31, 2024 | 990-EZ | $0 | – | – | $0 | – | $0 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $889,147
- Program service revenue
- $0
- Investment income
- $146
- Other revenue
- $0
Expenses
- Grants and similar amounts paid
- $0
- Other salaries and wages
- $20,201
- Salaries, compensation and benefits (total)
- $20,201
- Professional fundraising fees
- $0
- Accounting fees
- $6,000
- Travel
- $1,570
- Depreciation
- $118,189
- Program services (functional)
- $195,831
- Management and general (functional)
- $6,677
Balance sheet and other
- Total assets, start of year
- $0
- Total assets, end of year
- $686,785
- Total liabilities, end of year
- $0
- Net assets, end of year
- $686,785
- Land, buildings and equipment
- $472,758
- Net assets without donor restrictions
- $686,785
- Gross receipts
- $889,293
- Employees
- 0
- Volunteers
- 5
- Year formed
- 2024
- State of legal domicile
- CA
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Ying Sheng | Prsident Trustee or director, Officer | 2 | $0 |
| Lianmin Zheng | Vice President & Secretary Trustee or director, Officer | 1 | $0 |
| Tiancheng Xie | Treasurer Trustee or director, Officer | 0.5 | $0 |
| Jerry Yuan Zhou | Director Trustee or director | 1 | $0 |
| Clark Barrett | Director Trustee or director | 0.1 | $0 |
990-EZ for the year ended December 31, 2024: 3 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Ying Sheng | CEO | 20 | $0 |
| Lianmin Zheng | Treasurer | 20 | $0 |
| Zihao Ye | Secretary | 10 | $0 |
Address and contacts
- Address (IRS master file)
- 2108 N ST STE N, SACRAMENTO, CA 95816-5712
- Principal officer (990 for 2025)
- Ying Sheng, 2108 N ST STE N, Sacramento, CA 95816
- Signed the 990
- Ying Sheng, President
- Return prepared by
- MAY Consulting PLLC
Mission
LMSYS Corp advances open research and education in large-scale model systems by developing and sharing open-source models, datasets, systems, and evaluation tools that promote transparency, accessibility, and collaboration across the global research community.
Program accomplishments
- Open Research and Model Development: LMSYS Corp leads collaborative efforts in developing open large language models and related systems. Through initiatives such as Vicuna, Chatbot Arena, and LMSYS Chatbot Leaderboard, we support open benchmarking, transparency, and knowledge sharing across the AI research community. These programs provide critical infrastructure for reproducible AI research and foster innovation through open collaboration and comparative evaluation.Expenses $145,523
- AI Benchmarking and Transparency Initiatives: The Organization develops and maintains public evaluation platforms that allow researchers and the public to test and compare AI models in real time. By operating open, accessible benchmarking environments, LMSYS Corp promotes fairness, reproducibility, and accountability in AI performance measurement. These initiatives help ensure that AI development serves both academic progress and societal benefit.Expenses $48,508
- Educational Outreach and Community Engagement: LMSYS Corp hosts workshops, tutorials, and educational events to bridge the gap between cutting-edge AI research and broader public understanding. We engage with universities, research groups, and open-source communities to support hands-on learning opportunities and promote best practices in responsible AI development. Our outreach activities foster global participation and empower individuals to contribute meaningfully to the open AI ecosystem.Expenses $1,800
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990-EZ on file |
| 2023 | December 31, 2023 | May 15, 2024 | No data |
IRS record
- EIN
- 99-4817542
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (509(a)(2))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 2024
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Science and technology (U41)
- Assets (IRS master file)
- $686,785
- Income (IRS master file)
- $889,293
Filing history
990-N: the IRS publishes only the latest e-Postcard per organization; earlier years appear here as 990.tax collects the monthly files. 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS.
Questions about LMSYS CORP
- What is the EIN of LMSYS CORP?
- The employer identification number (EIN) of LMSYS CORP is 99-4817542.
- Is LMSYS CORP tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2024.
- Are donations to LMSYS CORP tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does LMSYS CORP file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of LMSYS CORP due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did LMSYS CORP last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who is the principal officer of LMSYS CORP?
- The 990 for the year ended December 31, 2025 names Ying Sheng.
- Who are the officers and directors of LMSYS CORP?
- The 990 for the year ended December 31, 2025 lists 5 people; 0 received compensation from the organization.
- How much revenue does LMSYS CORP have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $889,293, expenses of $202,508 and total assets of $686,785 at year end.
Other nonprofits in SACRAMENTO
- ANITA BORG INSTITUTE FOR WOMEN AND TECHNOLOGY EIN 77-0480427 · last filed 990 for 2024
- CALIFORNIA COUNCIL ON SCIENCE AND TECHNOLOGY EIN 94-3093624 · last filed 990 for 2024
- CALIFORNIA WATER DATA CONSORTIUM EIN 84-2664083 · last filed 990 for 2025
- CALIFORNIA DENTAL ASSOCIATION FOUNDATION EIN 68-0411536 · last filed 990 for 2024
- MATHEMATICAL SCIENCES PUBLISHERS EIN 52-2450490 · last filed 990 for 2024
- MOSQUITO AND VECTOR CONTROL ASSOCIATION OF CALIFORNIA EIN 94-1686612 · last filed 990 for 2025
- INTERNATIONAL SCIENTIFIC ASSOC FOR PROBIOTICS AND PREBIOTICS INC EIN 46-0477340 · last filed 990 for 2025
- CALIFORNIA BIOTECHNOLOGY FOUNDATION EIN 77-0720482 · last filed 990 for 2024
All nonprofits in SACRAMENTO · California · Science and technology