Form 990 for tax year 2024

Totals

Total revenue

$2,944,541

Total expenses

$18,007,050

Contributions and grants received

$0

Grants paid

$4,450,207

Program service revenue

$1,176

Investment income

$2,943,365

Other revenue

$0

Total assets, end of year

$226,789,268

Total liabilities, end of year

$1,521,287

Net assets or fund balances, end of year

$225,267,981

Program services expenses (Part IX)

$17,757,316

Management and general expenses

$249,734

Fundraising expenses

$0

Program service expenses (Part III)

$17,757,316

Program services were 98.6% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

Line items

Every line the filer filed in Parts VIII, IX and X, as filed and in filed order. Blank columns are left out, and the lines are not forced to add up to the totals above.

Mission and programs · 2024

• THE DONALD F. AND MILDRED TOPP OTHMER LIBRARY OF CHEMICAL HISTORY IS AN INDEPENDENT RESEARCH LIBRARY ENCOMPASSING THE HISTORY OF CHEMISTRY AND RELATED SCIENCES, TECHNOLOGIES, AND INDUSTRIES. OUR LIBRARY HOUSES MORE THAN 150,000 PRINT VOLUMES, INCLUDING RARE BOOKS AND MANUSCRIPTS, ARCHIVAL MATERIALS, MODERN BOOKS AND JOURNALS, AND HISTORICAL PHOTOGRAPHS. THESE EXTENSIVE COLLECTIONS SPAN NEARLY SIX MILES OF SHELVES AND OFFER AN UNRIVALED RESOURCE FOR RESEARCHERS, WITH MODERN BOOKS AND JOURNALS IN 15 LANGUAGES, INCLUDING HARD-TO-FIND SOURCES LIKE DYE SAMPLE BOOKS AND TECHNICAL REPORTS. WE ALSO HAVE ONE OF THE GREATEST COLLECTIONS OF RARE BOOKS ON CHEMISTRY IN THE WORLD, WITH MORE THAN 7,000 VOLUMES FROM THE 15TH TO 19TH CENTURIES.

  Expenses $2,205,896

• THE SCIENCE HISTORY INSTITUTE ARCHIVES ACTIVELY COLLECTS AND PRESERVES THE PAPERS OF ORGANIZATIONS AND INDIVIDUALS WHOSE WORK HAS SIGNIFICANTLY ADVANCED OUR SCIENTIFIC UNDERSTANDING OF CHEMISTRY, CHEMICAL ENGINEERING, AND THE LIFE SCIENCES AND ITS ALLIED FIELDS. ARCHIVES STAFF COLLECTS, PRESERVES, DESCRIBES, AND MAKES AVAILABLE THE UNIQUE, UNPUBLISHED MATERIALS THAT DOCUMENT THE PAST 200 YEARS OF OUR SCIENTIFIC HISTORY. SPANNING OVER 6,000 LINEAR SHELF FEET, THESE COLLECTIONS ARE A MAJOR ATTRACTION FOR SCHOLARS OF THE MODERN CHEMICAL AND MOLECULAR SCIENCES. WE ACTIVELY COLLECT ARCHIVAL PAPERS FROM OUTSTANDING SCIENTISTS, INDUSTRIES, AND PROFESSIONAL ORGANIZATIONS. COLLECTION STRENGTHS INCLUDE THE FIELDS OF SCIENTIFIC INSTRUMENTATION, CHEMICAL EDUCATION, MATERIALS SCIENCE, QUANTUM CHEMISTRY, AND CHEMICAL ENGINEERING.

  Expenses $11,101,213 · Revenue $1,176

• GRANT TO THE SCIENCE HISTORY INSTITUTE.

  Expenses $4,450,207 · Grants $4,450,207

As filed on the 2024 return. The filer continues this part on Schedule O, which is not shown here.

Listed in Part VII

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. A Schedule J breakdown is as filed: base pay, bonus, other, deferred compensation and nontaxable benefits from this organization, with any from related organizations beside each, and the filer's own total. It is shown with the Part VII listing of the same name on the same return. The form gives no key between the two, so that pairing is ours, and is marked matched by us.

Schedule J

Part I's answers as filed. A line not listed was left unanswered; on lines 1a and 3 that means the box was not checked.

Grants on this return

• SCIENCE HISTORY INSTITUTE

  $4,450,207

  GENERAL ASSISTANCE

Related organizations on this return

Schedule R Part II: tax-exempt organizations related to the filer by control. It does not record shared board members or money.

• SCIENCE HISTORY INSTITUTE

  501(C)(3) · MUSEUM AND PUBLIC OUTREACH · PA

Provenance

Return type

form_990

Tax year

2024

Filed

22 January 2026

IRS schema version

2024v5.5

Source object

202640479349301779

Check it against the return as filed: the GivingTuesday Data Lake hosts a public copy of the original XML.

The source document this was parsed from is served over the API, which is where bulk and document access live.