Donor header

MARK HEISING

Individual · ATHERTON, CA · MEDLEY PARTNERS, LLC · FOUNDER

$408,171 total given · Largest contribution $225,000

Giving is concentrated among a small set of recipients.

Active cycles

1999-20002001-20022003-20042005-20062007-20082009-20102011-20122013-20142015-20162017-20182019-20202021-20222023-20242025-2026

Panel 2 • Finance overview

Total given

$408,171

First seen Mar 24, 2025 · Last activity Dec 18, 2025

Contribution footprint

6 recipients

10 contributions · Avg $40,817

Concentration

Top recipient 86.2%

Top 3 94.7%

Top 10 100%

Total givingReference baseline

Mar 2025Jul 2025Nov 2025Mar 2026

Spike markers

1Mar 2025 · 2 notable contributions
- ENVIRONMENTAL DEFENSE ACTION FUND CALIFORNIA PAC · $25,000
- KOUNALAKIS FOR GOVERNOR 2026; ELENI · $10,000
2Dec 2025 · HEISING-SIMONS ACTION FUND NONPROFIT 501 (C) (4) · $351,671

Scope: Last 12 months

Panel 3 • Top recipients

Recipient	Total	Share*	Count	Dates
HEISING-SIMONS ACTION FUND NONPROFIT 501 (C) (4)	$351,671	86.2%	3	Dec 2025 - Dec 2025
ENVIRONMENTAL DEFENSE ACTION FUND CALIFORNIA PAC	$25,000	6.1%	2	Mar 2025 - Mar 2025
KOUNALAKIS FOR GOVERNOR 2026; ELENI	$10,000	2.4%	1	Mar 2025 - Mar 2025
KOUNALAKIS FOR TREASURER 2026; ELENI	$10,000	2.4%	2	Sep 2025 - Sep 2025
21ST CENTURY ALLIANCE GOOD GOVERMENT PAC	$9,000	2.2%	1	May 2025 - May 2025
LIMON FOR STATE CONTROLLER 2030	$2,500	0.6%	1	Oct 2025 - Oct 2025

Showing 6 of 6

* Share is percent of donor total in the selected scope. Page rows are a subset and typically do not sum to 100%.