Plos
Legal name: Public Library of Science
Nonprofit profile at a glance
- EIN
- 680492065
- IRS 990 coverage
- 2011–2024
- Official website data refreshed
- Aug 2026
- Forms available
- Form 990 2024, Form 990-T 2024
- Location
- San Francisco, California, US
- Phone
- +1 (415) 624-1215
- Rating
- 68
- Verdict
- SUPPORTED
- Rating confidence
- Moderate
- Sector
- General Science
Reported finances
- Revenue
- $41,335,403
- Expenses
- $36,985,422
- Assets
- $32,799,863
- Liabilities
- $9,775,427
Source: IRS Form 990. Selected filing: tax year 2024. Amounts in USD.
Leadership & pay
23 people listed
Executive titles in this filing
- ALISON MUDDITT (CHIEF EXECUTIVE OFFICER)
- AARON DODDS (EXECUTIVE DIRECTOR RESEARCH AND MGMT(THRU 01/2024))
Highest reported compensation
- ALISON MUDDITT (CHIEF EXECUTIVE OFFICER): $543,320 total reported compensation
- REBEKAH DARKSMITH (CHIEF OF STAFF AND CHIEF MARKETING AND COMMUNICATI): $349,922 total reported compensation
- VERONIQUE KIERMER (PUBLISHER & EXEC EDITOR): $340,302 total reported compensation
Source: IRS Form 990. Selected filing: tax year 2024. Names and roles reflect this filing, not necessarily current officeholders.
Overview
Mission
PLOS is a nonprofit, open access publisher that accelerates progress in science and medicine by leading a transformation in research communication. Our mission is to transform research communication to accelerate progress in science and medicine.
What it reported doing in 2024
The public library of science (plos) advances its charitable purpose by driving open science forward with measurable, meaningful change in research publishing, policy, and practice. We publish a portfolio of peer-reviewed, open access scientific journals, removing financial, legal, and technical barriers to accessing research by ensuring that all articles and associated data are freely available to the public without subscription fees. During the tax year, plos published approximately 20,000 peer-reviewed articles from authors in 163 countries across 14 scientific journals and provided $5.7 million in partial or full article processing charge (apc) waivers to authors. 4a. Largest program service (by expenses): science and medical publishing are the core of our program expense at over $31million. In 2024 we published more than 20,000 research articles documenting the methods, observations and discoveries of a diverse scientific community. Thousands of researchers across the globe dedicated their time as academic editors and reviewers to bringing this work to the public.the activities involved in our publishing operation include:- editorial and production work - receipt and triage of submissions; performing and coordinating their peer review; and production and online publication of accepted articles. - marketing and outreach - promoting articles and inviting submissions, increasing awareness and understanding of open science benefits and practices, promoting initiatives such as calls for papers, and creating resources for authors and reviewers.- publishing ethics - handling ethical and scientific concerns involving submissions and published articles.- engagement with research communities (e.g. By attending and/or organizing conferences, events, and workshops) - to ensure the journals and their policies reflect the research interests and values of these fields and communities.- media - collaborating with authors, institutions, science media centers and journalists to communicate research to both scientists and society. The scope of plos journals publishing in 2024 includes:- plos one is a global, inclusive journal publishing research in over two hundred subject areas across science, engineering, medicine, and the related social sciences and humanities. - plos biology is a leading life science journal that champions high-impact research across all disciplinesfrom molecules to ecosystems.- plos climate empowers global, multidisciplinary collaboration, and enables decision-makers at every level of society to take urgent, evidence-based action on the causes and impacts of climate change.- plos complex systems is a selective interdisciplinary journal focused on research that AIDS our understanding of the world through a complexity lens, and fosters discussion within the emerging complexity community.- plos computational biology is home to research of significance that seeks to better understand the living world through computational methods and cutting-edge tools.- plos digital health is dedicated to advancing equitable and digitally-enabled healthcare, increasing trust in new tools, and improving reproducibility in the field of digital health research. - plos genetics publishes research related to genetics and genomics across the full breadth of this field, from microbes to humans and from basic science to translational approaches.- plos global public health makes work of the highest methodological and ethical rigor openly available to the researchers, policy experts, and clinicians who depend on it to tackle urgent health crises and advance health equity.- plos medicine is our leading health science journal publishing impactful research that transforms global healthcare and advances clinical understanding.- plos neglected tropical diseases focuses on research addressing the needs of neglected, forgotten, and under-resourced populations, working with global communities and researchers to improve the health of all.- plos pathogens pu
Operating model
- Revenue model
- Earned-program. 92% of the money available for current operations came from fees and other program revenue.
- Distribution model
- Direct operator. The filing allocates 100% of reported program-service expenses outside its grant, affiliate-payment, and member-benefit lines. This expense classification does not rule out separately announced grant awards.
The verdict
SUPPORTED - A large share of available resources goes toward mission work and most voting board members are independent. The filing reports few safeguards for money sent abroad and the filing does not identify recipients for some grant dollars.
Rating breakdown
- Financial Efficiency: 69
- Transparency & Controls: 61
- Accountability: 95
- Sustainability: 51
- Growth: 20
Detailed rating inputs
Financial Efficiency
- Mission deployment rate: 73.6%; rating input score 74
- Program expense ratio: 83.9%; rating input score 84
- Fundraising efficiency: Limited
Transparency & Controls
- Consistency checks: 100%; rating input score 100; 62nd percentile among comparable filings
- Pay-setting controls: 4 of 6 controls in place; rating input score 67
- Compensation committee: Pass
- Independent consultant: Missing
- Other Form 990s reviewed: Missing
- Written employment contract: Pass
- Compensation survey or study: Pass
- Board or committee approval: Pass
- Foreign activity oversight: Scored; rating input score 0
- Grant itemization coverage: Scored; rating input score 0
- Major donor itemization: Yes; rating input score 100
- Related-party transparency: Yes; rating input score 100
Accountability
- Independent voting board: 92.3%; rating input score 92; 25th percentile among comparable filings
- Governance controls: 9 of 9 controls in place; rating input score 100
- Conflict-of-interest policy: Pass
- Whistleblower policy: Pass
- Document-retention policy: Pass
- CEO compensation review process: Pass
- Other executive compensation review process: Pass
- Form 990 shared with the board: Pass
- Board meeting minutes documented: Pass
- Audit committee oversight: Pass
- Independent financial-statement audit: Pass
Sustainability
- Operating margin: 10.5%; rating input score 69; 69th percentile among comparable filings
- Total-asset coverage ratio: 0.89; rating input score 32; 32nd percentile among comparable filings
- Liabilities to assets ratio: 0.3; rating input score 46; 46th percentile among comparable filings
- Officer compensation ratio: 8.2%; rating input score 29; 29th percentile among comparable filings
Growth
- Program expense growth: -1% per year; rating input score 0; 8th percentile among comparable filings
- Revenue growth: -0.1% per year; rating input score 0; 8th percentile among comparable filings
- Asset growth: 0.5% per year; rating input score 100; 12th percentile among comparable filings
Details
- What they do: 4 programs and campaigns described on the official site · 1 operating location identified
- Where the money goes: 73.6% of revenue deployed · 83.9% of spending went to programs
- Governance: 12 of 13 board members independent · 9 of 9 filing controls reported
- Programs: 1 filed program accomplishment · $31M in reported program spending
- Leadership: top reported pay $543K · 23 people listed · 4 of 6 pay-setting controls reported
- Highest-paid contractors: 5 contractors listed · $5.2M reported
- Consistency: 32 of 32 current checks pass
- Schedules: 7 filed schedules · includes major donors, foreign activity, executive pay, and related organizations
- Filing history: 13 filing years from 2011 to 2024
- Contacts: How to reach this organization
- Money network: 11 filed money-flow records
- Grant readiness: Federal tax and exclusion status, award history, and grant-maker relationships.
- People: Everyone the filings name, and which of them the filings identify by more than a name.
- Staff and benefit plans: Retirement and health plans the organization files with the Department of Labor, and the people in them.
Key Signals
Signals prioritize questions for review. They are not findings of misconduct.
- High — Transparency & Controls: Foreign activity oversight scored 0/100.
- High — Transparency & Controls: Grant itemization coverage scored 0/100.
- High — Growth: Program expense growth scored 0/100.
- High — Growth: Revenue growth scored 0/100.
- Moderate — Sustainability: Total-asset coverage ratio scored 32/100.
- High — Sustainability: Officer compensation ratio scored 29/100.
- Moderate — Sustainability: Liabilities to assets ratio scored 46/100.