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Compensation 990 is an independent service that uses public IRS Form 990 filings as its source data. We clean and standardize this information, but the original filings may contain errors or omissions. Years on this site refer to the organization’s fiscal year end date on the filing.

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Employees Howard Hughes Medical Institute Mark Sproles

Mark Sproles

Highest compensated employee

Managing Director, Private Markets at Howard Hughes Medical Institute

Fiscal year ended August 31, 2024. Published on January 25, 2026.

$1,692,904
2024

Total compensation

Mark Sproles has been listed as an employee of Howard Hughes Medical Institute in Form 990 filings since fiscal year 2023. Total compensation for Mark Sproles has increased by 72.2% from 2023 to 2024.

Annual compensation details

$1,692,904
+72.2%
Managing Director, Private Markets
2024
$1.6M org
40 hrs/wk
$68k other
--
$982,853
Managing Director, Private Markets
2023
$951k org
40 hrs/wk
$33k other
--

Total compensation by year

Compare the compensation of Mark Sproles to:

2024

Other employees at Howard Hughes Medical Institute

Donald Koch
Vice President and Chief Investment Officer
$3,664,516
$3,592,895 from orgNo related comp$71,621 other
Erin K O'Shea, Ph.D.
President
$1,660,638
$1,596,598 from orgNo related comp$64,040 other
Glen Zwicker
Managing Director and HEAD of Investment Operations
$1,524,909
$1,454,312 from orgNo related comp$70,597 other
Richard A Pender
Managing Director, Public Markets (Thru 4/23)
$1,140,715
$1,107,827 from orgNo related comp$32,888 other
Blanton Tolbert, Ph.D.
Vice President Science Leadership and Culture
$1,113,203
$1,060,174 from orgNo related comp$53,029 other
Karen Eifler
Managing Director, Public Markets
$1,024,031
$989,382 from orgNo related comp$34,649 other
Heidi E Henning, Esq
Vice President and General Counsel and Secretary
$952,355
$889,582 from orgNo related comp$62,773 other
Sean B Carroll, Ph.D.
Investigator/ Former Vice President SCI and Ed.Media Group (Thru 11/23)
$905,196
$848,487 from orgNo related comp$56,709 other
Justin Galen
Managing Director, Private Markets (Thru 4/24)
$894,194
$827,774 from orgNo related comp$66,420 other
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Revisions to this profile

January 25, 2026:
2024 Howard Hughes Medical Institute 990 published
January 25, 2026:
2023 Howard Hughes Medical Institute 990 published

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