Return of Organization Exempt From Income Tax

This document is the 2024 IRS Form 990 'Return of Organization Exempt From Income Tax' for the Stockholm Environment Institute (SEI) U.S., Inc., a 501(c)(3) non-profit organization based in Somerville, Massachusetts. The filing details the organization's financial activities, governance, and program accomplishments for the 2024 calendar year, focusing on its mission to provide research and decision-support tools for sustainable development, energy, water, and climate policy.

• The organization's mission is to support decision-making and induce change toward sustainable development globally by bridging science and policy in environment and development through integrated applied systems research, which informs policy advice, capacity building, and decision support.
• For the 2024 calendar year, the organization reported total revenue of $5,559,480 and total expenses of $6,268,381, resulting in a revenue loss of $708,901.
• The organization's total assets at the end of the year were $4,774,586, with total liabilities of $1,497,190, leaving net assets or fund balances of $3,277,396.
• The primary program service accomplishment involves conducting research and engaging with decision-makers and civil society on energy, water, and climate policy, as well as broader dimensions of development, sustainability, and equity, with total program service expenses of $4,790,096.
• Revenue sources for 2024 included $1,770,861 in contributions and grants, $3,182,400 in contract revenue, and $423,436 in license revenue.
• The organization's highest-paid employee in 2024 was Charles Heaps, a Senior Scientist, who received $197,443 in reportable compensation from the organization and $25,036 in other compensation.
• SEI-US maintains a governing body with 6 voting members, all of whom are independent.
• The organization conducts activities in multiple global regions, with the highest expenditures in East Asia and the Europe (including Middle East and North Africa) region, which totaled $454,570.

APA

Stockholm Environment Institute (2024). Return of Organization Exempt From Income Tax. https://www.sei.org/wp-content/uploads/2025/06/2024-form-990-public-inspection-copy.pdf

Chicago

Stockholm Environment Institute. Return of Organization Exempt From Income Tax. 2024. https://www.sei.org/wp-content/uploads/2025/06/2024-form-990-public-inspection-copy.pdf.

Wikipedia

{{cite report |author=Stockholm Environment Institute |title=Return of Organization Exempt From Income Tax |date=2024 |url=https://www.sei.org/wp-content/uploads/2025/06/2024-form-990-public-inspection-copy.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stockholmenvironmentinstitute2024return, author = {{Stockholm Environment Institute}}, title = {{Return of Organization Exempt From Income Tax}}, institution = {Stockholm Environment Institute}, year = {2024}, url = {https://www.sei.org/wp-content/uploads/2025/06/2024-form-990-public-inspection-copy.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }