Public Charity

THE HDF GROUP

THE HDF GROUP, of CHAMPAIGN, IL, is a Public Charity tracked in Imperigo's IRS 990 database. The 2025 filing shows $3.0M in revenue, $3.2M in expenses, $2.1M in total assets. 3 publicly reported grants to this organization, totaling roughly $170K, appear in IRS filings.

EIN: 680600605 CHAMPAIGN, IL Computer Science NTEE: U41 Latest filing: 2025
Total Revenue$3.0M
Total Expenses$3.2M
Total Assets$2.1M
Grant Records3
Funding Total$170K
Filing Years2021–2025

Mission

THE ORGANIZATION'S PRIMARY EXEMPT PURPOSE IS TO ENSURE THE SUSTAINABILITY OF HDF TECHNOLOGIES AND ONGOING ACCESSIBILITY OF HDF-STORED DATA FOR THE GOVERNMENT AGENCIES AND ORGANIZATIONS THAT HAVE MISSION-CRITICAL SYSTEMS RELYING ON HDF. SPECIFICALLY, THE ORGANIZATION'S MISSION IS TO DEVELOP AND MAINTAIN FREE, OPEN SOURCE COMPUTER APPLICATIONS THAT MOVE AND STORE SCIENTIFIC AND COMPLEX DATA AMONG DISPARATE COMPUTING SYSTEMS. THERE ARE OVER 200 DIFFERENT TYPES OF COMPUTER APPLICATIONS USING HDF TECHNOLOGIES, AND AN ESTIMATED 1.6 MILLION USERS OF NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA) DATA ALONE, IN HDF FORMATS.

Where $100 goes at The Hdf Group

How The Hdf Group divides every $100 it spends, from its own Form 990 filings, averaged across 9 years.

$74 Programs the work itself
$26 Management running the organization
$0 Fundraising none reported

No fundraising costs are reported. That often means fundraising runs through a separate affiliated organization that files its own return.

Inside the $74 for programs

$74
The Hdf Group researched, developed, and tested modifications to hdf5 to expand functionality, improve performance, and increase usability of hdf5
All program spending
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Source: Form 990 filings with the IRS, latest fiscal year 2025. Shares are from the organization's reported expenses. Data by Imperigo; not affiliated with the IRS.

Officers & Directors

EMPLOYEE Aleksandar Jelenak
DIRECTOR Easwaran G Nadhan
EXECUTIVE DIRECTOR Gerd Heber
PRESIDENT Jessica Popp
DIRECTOR OF TOOLS AND CLOUD John Readey
EMPLOYEE Melinda Eads

Officer compensation and complete director data available with membership.

Top Grant Purposes

Unspecified
$169,570 3 grants

Financial Trends

Year Revenue Expenses Assets
2025 $3.0M $3.2M $2.1M
2024 $2.5M $3.2M $2.4M
2023 $3.7M $3.3M $3.2M
2022 $3.3M $3.3M $3.0M
2021 $3.8M $3.8M $2.7M

Between 2021 and 2025, reported annual revenue declined from $3.8M to $3.0M (-19%), with total assets most recently reported at $2.1M.

Interactive year-over-year charts and full filing details available with membership.

See the full picture for THE HDF GROUP

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