Charity Search / SAN MATEO ARBORETUM SOCIETY INC
Environment (C410) 990 on File

SAN MATEO ARBORETUM SOCIETY INC

EIN: 51-0178003 · SAN MATEO, CA 94401-4202 · United States · FY 2024 Data
3 out of 5 47 / 100 Based on 2+ years of filings
Financial strength (30%) 71/100
Reliability (20%) 55/100
Effectiveness (25%) 61/100
Impact (25%) No data yet
Financial data: FY 2024 · Scored 9/13/2026
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CharityAI™ Score
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Financial Overview — FY 2024
$124K
Total Revenue
$107K
Total Expenses
$230K
Net Assets
N/A
Employees
Revenue Sources
Expense Breakdown
Program Expense Ratio 100.0%
Fundraising Efficiency N/A
Operating Reserve 25.67x
Liability-to-Asset 1.8%
Revenue Diversification 41.8%
Compared with Peers
FY 2024
Compared with 2,852 similar organizations (United States, Environment, $100K–$1M in expenses), FY 2024.
This organization Middle half of peers (P25–P75) Peer median
Ratio This org Peer median Position (P10 → P90)
Program expense ratio
Program expenses / total expenses · higher is better
100.0% 82.4%
P10P90
Top quarter
Operating reserve
Months of expenses covered by net assets · higher is better
25.7 mo 13.6 mo
P10P90
Above median
Liabilities to assets
Total liabilities / total assets · lower is better
1.8% 1.0%
P10P90
Below median
Revenue concentration
Share of revenue from the largest source · lower is better
41.8% 91.6%
P10P90
Top quarter
Revenue growth
Year over year revenue growth
24.3% 10.6%
P10P90
Expense growth
Year over year expense growth
36.0% 11.2%
P10P90
Surplus margin
Surplus as a share of revenue
13.4% 6.0%
P10P90
Financial History
Year Revenue Expenses Net Assets Program % Staff
2024 $124K $107K $230K 100.0% —
2023 $100K $79K $213K 100.0% —
2022 $106K $75K N/A — 1
2021 $84K $119K N/A — 1
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Organization Details
EIN
51-0178003
State
CA
City
SAN MATEO
ZIP
94401-4202
Classification
C410
Category
Environment
Rating
3★
Coverage
A
Last Updated
Aug 2026
Form 990
On File
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