News & Views: Market Sizing Update 2025 – Has OA recovered its mojo?

Dan Pollock and Heather Staines • October 21, 2025

Overview


After a rocky couple of years, the open access (OA) market may be finding its footing again. Each year, Delta Think's Market Sizing analyzes the value of the OA scholarly journals market—that is, the revenue generated by providers or the costs incurred by buyers of content.


Our analysis estimates that the OA segment expanded to just under $2.4bn in 2024. Although growth has improved compared with last year’s deceleration, it continues to lag behind the broader historical trend for OA.


The proportion of articles published as OA has declined slightly, likely driven by continued reduction in the output from the large OA publishers. This trend has benefited established publishers, who saw growth in OA activity and revenue as they continued to consolidate their positions.


Looking ahead, OA could soon begin outpacing the broader journals market once again—but likely through different growth drivers than in the past.


Read on to see what those shifts might look like.


Headline findings


Our models suggest the following headlines for the 2024 open access market:

  • Market size: We estimate that the OA market grew to just under $2.4bn in 2024, an increase of 6.9% over the previous year. Although an improvement on the low growth the year before, this is still only one quarter of its historic growth rates.
  • Overall journals market: We estimate the total scholarly journals market to have increased by 2.5% in 2024, compared with its long-term low single-digit growth around 5%.
  • OA share of output and value: Just under 50% of all scholarly articles were published as paid-for open access, accounting for slightly over 20% of corresponding market value.
  • Fully OA publishers: Large, fully open access publishers saw a significant drop in their article output in 2024. The share of fully OA articles shrank slightly, but fully OA share of revenue ticked up. We anticipate both volume and value may begin to recover next year.
  • Hybrid OA: Hybrid continues to make up for some of the shrinkage in fully OA output with both hybrid article and revenue growth remaining strong. Slightly higher-priced fully OA options have also likely contributed to fully OA’s increasing revenue.
  • Currency effects: Without currency effects, OA market value would have grown by nearly 11%, and the overall journals market by 7.5%. This suggests that underlying growth in the OA market value has recovered since last year, and the overall market grew above long-term trends.
  • Future outlook: OA publishing has once again outpaced the broader journals market. From 2024 to 2027, we anticipate a CAGR (average growth each year) of 7.7% in OA output and 12% in OA market value-- roughly double last year’s projections, though still just below long-term averages.


A note about our method


As ever, we are very grateful to the organizations that participate in our annual survey, which we anonymize and aggregate to inform our estimates. We will soon send our usual detailed market update and analysis to participants, which breaks out fully OA and hybrid details.


Our market estimates focus on research publications for which money is likely to be paid, either to read or to publish. Our definition of open access excludes “bronze” (public access) and “green” (repository-only) articles.


Rather than simply looking at annual figures, we extract underlying trends and leverage historical data to identify trends and inform strategic decision-making. Each year our underlying data may change as data sources improve and evolve their methods. We continue to refine our view on resulting trends as more information becomes available. Therefore, each year we restate historic figures as needed to keep them up to date.


Trends


OA’s share of output has leveled off – and may stay that way for the next year or two. However, even with that flat output, OA’s share of revenues continues to rise. Authors appear to be choosing slightly higher-priced OA options compared with a few years ago. Hybrid OA is capturing more of the OA mix, yet long-term growth still depends on trends in fully OA output.


Delisting fallout stabilizes


The delisting of journals from Web of Science in 2023 had a knock-on effect across OA-only publishers’ portfolios. Quality concerns centered on special issues, which had been a major driver of OA growth. It seemed unlikely that (many of) these articles would find other outlets. Last year, we noted that this disruption stalled fully OA growth. This year’s data suggest that the bleeding has largely stopped, with fully OA articles output down only slightly in 2024.


OA output has plateaued


OA’s total share of output has hovered around 50% (± one percentage point) since 2022. Last year we asked whether OA had peaked. The evidence points to a plateau, at least for now. While a major driver of (fully) OA growth has been removed – or at least reduced – publishers are adapting and beginning to recover. We anticipate that fully OA output will begin growing again next year, outpacing the broader market, though not returning to its “glory days” of a few years ago.


Revenue growth continues—slower but steadier


After a pause in progress last year, OA continues to take share of total publishing revenue, albeit at a slower pace. Authors have shifted towards established publishers, who saw strong increases in both OA volume and revenue, even as the overall OA market has softened.


Authors appear to be paying slightly higher publication fees, likely for two reasons:

  1. Fully OA APCs charged by the big corporates are often (though not always) higher than those from OA-only publishers.
  2. Hybrid OA APCs are higher still – and hybrid’s share is growing.


Subscription output still matters


Subscription (non-OA) publishing output and revenue continue to grow, even though its market share is slowly shrinking.


The value gap narrows


Since 2022, around 50% of published output has been OA, accounting for about 20% of total market value. By 2027, we anticipate OA’s value share could reach 25%, even if output remains stable. OA articles still generate less revenue per paper than subscription articles, but that gap is likely to keep narrowing as publication fees increase—a trend we project will continue.


Mixed-model deals remain a wildcard


The impact of transformative and mixed-model deals on pricing dynamics is not yet clear. Consolidation enables large publishers to grow OA revenues, but if read-and-publish deals have price caps, some OA output moving from smaller OA publishers to larger ones might not translate into higher OA revenue overall.


Policy and funding shifts may reshape the field


It is too soon to tell how recent changes in US policy and funding may influence market valuations, but these shifts could alter both pricing and output patterns in coming years.


Early indications from Delta Think’s Researcher Survey suggest that a significant portion of researchers expect to publish fewer articles, including some who specify fewer OA articles. A follow up survey underway now will delve into the reasons behind this anticipated change.


Conclusion


At this time last year, we identified 2023 as a potential inflection point for open access (OA) and asked whether its explosive growth had peaked. The data from 2024 suggest otherwise: OA output has not peaked, but it has plateaued, holding steady around the 50% mark. The surge driven by special issues has subsided, but the worst effects of journal delisting now appear to be behind us. Fully OA publishing is stabilizing and poised for renewed - albeit more modest - growth in 2025.


Meanwhile, as fully OA steadies, hybrid OA and large corporate publishers are consolidating their positions. Hybrid output and revenue continue to rise, outpacing the broader market and poised to represent a sizeable portion of OA revenues within the next two years. We estimate that by 2027, hybrid could make up one-third of OA output and account for nearly half of OA market value-- a reflection of higher prices and a shift in author preference toward more established publishing venues.


Looking ahead, we expect the OA market to continue its recovery, with value growth outstripping output growth. OA’s share of total market value is projected to rise to 25% by 2027, even if the overall output stays roughly the same. This suggests a steady increase in publication fees and the normalization of higher-value OA publishing models.



The underlying demand for OA remains strong. The market has effectively self-corrected, with established players capitalizing on shifts in author behavior. The hypergrowth era may be over, but OA appears ready to reclaim its position as the fastest-growing segment of scholarly publishing--this time driven by consolidation, strategic pricing, and evolving business models.


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Our industry does not systematically report comprehensive data about market volumes or value. So, any market sizing is an approximation, and figures should be taken as approximate. Subscribers to our Data & Analytics Tool can drill into the numbers in much greater depth, including analyzing fully OA vs. hybrid OA details, society-specific output and subscription output. Please get in touch if you want to know more.


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This article is © 2025 Delta Think, Inc. It is published under a Creative Commons Attribution-NonCommercial 4.0 International License. Please do get in touch if you want to use it in other contexts – we’re usually pretty accommodating.



TOP HEADLINES


NERL Partners with OA Switchboard to Advance Transparency in Open Access – October 15, 2025



"NERL is pleased to announce that it has signed a 3-year agreement with OA Switchboard, an intermediary that facilitates the transmission of standardized OA publication data between institutions, publishers, and funders. By joining in this collaborative effort...NERL members will be supporting global OA infrastructure with metadata that is authoritative, transparent, and timely."


De Gruyter Brill to Add 66 More Journals to its Subscribe to Open (S2O) Program in 2026 – October 1, 2025



"In 2026, De Gruyter Brill will significantly expand its Subscribe to Open (S2O) program, DG2O, by transitioning 66 additional De Gruyter journals to open access. This brings the total number of titles in the program to 124, marking a major milestone in the publisher’s ongoing commitment to making high-quality research accessible worldwide."


AAAS: Response on NIH public access policy – September 24, 2025


"AAAS has responded to the National Institutes of Health’s request for input on its plan for “Maximizing Research Funds by Limiting Allowable Publishing Costs,” as released in July 2025. AAAS’ response applauds NIH for addressing the rising Article Processing Charges that scientific journal publishers are increasingly charging NIH-supported scientists to publish their findings."


OA JOURNAL LAUNCHES


American Society of Anesthesiologists Launches New Journal Anesthesiology Open – October 1, 2025


"The American Society of Anesthesiologists (ASA) today announced the launch of Anesthesiology Open, a new online, peer-reviewed, open access journal published by Wolters Kluwer. Anesthesiology Open’s website and manuscript submission site are now live."


By Lori Carlin & Meg White October 13, 2025
Collaborate with Delta Think to uncover how funding and policy uncertainty continue to reshape the research ecosystem — and gain tailored insights for your community.
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Ideas into Action: How Delta Think Can Help Dr. Shiffman’s keynote was about bridging the gap between knowledge and change. Publishing alone isn’t enough. We must communicate why our work matters, engage audiences inside and outside academia, and ensure that scholarly publishing not only reflects but drives societal progress. At Delta Think, we help publishers do just that— by grounding strategy in data, aligning with values, and building frameworks that support sustainable, evidence-based storytelling. Whether you're navigating AI, open access, research integrity, or the next wave of policy change, we’re here to help you turn insights into action. Let’s shape a stronger, clearer narrative—together. Let’s turn your SSP takeaways into action. 📩 Contact us at info@deltathink.com RESULTS COMING SOON: Researcher/Author Survey + Part II Analysis is nearly complete on the more than 13,000 responses to our Researcher/Author Survey, conducted in partnership with 27 professional societies and organizations. This data will generate systematic, quantitative insights from the market, and the accompanying analysis will support evidence-based strategy development and scenario planning within a rapidly evolving funding landscape and policy framework. Participants will receive detailed findings, but we are looking forward to sharing high-level insights with the wider community along the way. Based on the overwhelming response to this project and the extraordinary and ongoing shifts in US federal policy, we expect to conduct this survey again in the fourth quarter of this year to start to document trends. If you need more information, please don’t hesitate to reach out by emailing us at info@deltathink.com .
By Dan Pollock & Heather Staines May 20, 2025
After our previous analysis of the effects of inflation on APCs, we received a question about the effects of currency exchange rates. At a time when the dollar’s exchange rate is changing rapidly, what effect might that have for organizations buying services from abroad? Background Each year we survey the list Article Processing Charges (APCs) of more than 30 major and significant publishers. Going back to 2015, the dataset includes more than 20,000 unique titles and 150,000 title per year combinations. We have previously seen how headline prices typically increase each year, but mostly fall in real terms , once inflation is accounted for. After our most recent analysis, we were asked by a US-based institution whether our inflation numbers included currency effects. With the US dollar (USD) having weakened over the last few months, the institution found buying services priced in non-USD currencies to be significantly more expensive by the end of April 2025 compared with the start of the year. We take a snapshot of APCs at the same time each year. To compare like-for-like across our global market, we normalize prices to USD. This practice is commonly used by economists when analyzing global data and happens to be the most commonly used currency in our sample. Many non-US publishers – especially larger ones – offer an option of USD prices alongside their native currencies (and perhaps others). So, we sample USD prices where quoted, which cover on average around 94% of our annual samples of around 15,000 journals. Otherwise, we convert the prices cited in the publisher’s native currency into USD using the average exchange rate the most recent full year available. Effects of changing exchange rates Our analysis of price changes includes the effects of annual changes in exchange rates for the subset of around 6% of non-USD journals in our sample. It also includes any changes made by non-US publishers to their USD prices. However, it does not include the effects of significant and quick changes to exchange rates. Given the volatility in the US dollar over the last few months, we can dig deeper to explore the impact of these changes. And are there winners and losers depending on who’s buying or selling?
By Lori Carlin & Bonnie Gruber May 15, 2025
Background: Anticipating Change Earlier this year, the Delta Think team began reflecting on what potential decreases in United States federal funding could mean for research and scholarship both nationally and internationally. We knew our industry and clients also shared these uncertainties, so we embarked on an effort to capture market data for a more grounded understanding of trends. With analytics in hand, we could help our community begin to measure the impact of changes in the times to come and make informed decisions and plans. Methods: Transparency and Rigor Delta Think designed a researcher/author survey that explored topics such as potential research and publication output, peer review availability, conference attendance, society support, research concerns and sentiments, and more. Twenty-seven organizations, associations, and societies participated with us across fields in the health sciences, life sciences, physical sciences, engineering & technology, social sciences, and arts & humanities. A unique survey link was distributed to each participating organization who then shared it with their constituents between March 25th and May 4th. This outreach gave us unprecedented and comprehensive access to the scholarly community, enabling immense confidence in the data. The data generated will deliver systematic, quantitative insights from the market, and the accompanying analysis will support evidence-based strategy development and scenario planning within a rapidly evolving funding landscape and policy framework. Results: Initial Demographics Full results and analysis are in process, but we can share an overview of the response counts by segment:  We received 13,246 total responses from 138 countries; 60% of responses were from the US. All fields were well represented with Health Sciences and Life Sciences leading the way with more than 50% of responses. Physical Sciences and Engineering & Technology followed with 35% of responses, and those in the Arts & Humanities and Social Sciences saw close to 15%. Career stage also saw a good balance with about 34% identifying as Grad Students/Residents or in their Early Career, 31% in Mid-Career, and 30% Senior. Respondents worked across many different roles including 33% who selected Professor/Faculty/Educator, 12% who selected Healthcare Provider or Physician/Surgeon, and 10% who selected Researcher/Analyst. Conclusions: Stay Tuned and Sign Up Based on the large number of responses, we have a high degree of confidence in the data, and we know it will provide meaningful, evidence-based, and actionable intelligence not only for the 27 participating organizations, but also for the larger scholarly communications industry. Participants will receive the detailed findings, but we will share high-level insights along the way with the wider community. Based on the overwhelming response to this project and the extraordinary and ongoing shifts in US federal policy, we expect to conduct this survey again in the fourth quarter of this year to start to document trends. Current survey partners as well as new societies, associations, and organizations are encouraged to participate, so please contact us at info@deltathink.com for more information or to ensure you are included. This Author/Researcher Survey is a logical and natural extension of our work. Delta Think consultants specialize in uncovering evidence for our clients, discovering what that evidence means for them, and using the knowledge gained to build customer-driven, actionable business and publishing strategies. Through the expert utilization of innovative and creative market research techniques and analysis, we are committed to doing our part in support of the scholarly communication community, putting our ideas into action. We will also be attending the upcoming SSP Annual Meeting, so please reach out to set up a meeting with one of the team to hear more in Baltimore.
By Lori Carlin April 29, 2025
“I had a wonderful teacher about animal behavior.” – Jane Goodall Jane Goodall was renowned for her ability to understand chimpanzees in the wild simply by observing their day-to-day behaviors. Her subjects were her teachers. She immersed herself in their natural environment, which allowed her to gather authentic insights into her subjects’ social structures, tool use, communication, and cultural behaviors. This ethnographic style of research has now been adopted by the business world to gain deeper insights into customer needs, workflows, and challenges. What is Contextual Inquiry? Contextual Inquiry, as it’s frequently called in the commercial world, is a user-centered research method. Like Dr. Goodall in the field in Tanzania, Contextual Inquiry involves observing and interviewing users in their natural environments while they perform routine tasks, allowing market researchers to understand user behaviors, goals, motivations, and pain points in real-world contexts. The methodology is guided by four key principles: Context: Observations and interviews occur in the user’s actual environment. Partnership: Researchers collaborate with users to understand their processes. Interpretation: Insights are shared with users during the interview for clarification. Focus: The interaction is steered toward topics relevant to the research scope. Why Contextual Inquiry? Contextual Inquiry illuminates user behavior and workflows and can be used to inform solutions including product development, processes, and policies. 1. Deep Understanding of User Needs By observing users in their natural environment, contextual inquiry uncovers hidden needs, pain points, and behaviors that users may not articulate in surveys or traditional interviews. This identifies solutions that address real user challenges rather than assumed ones. 2. Authentic Data Collection Unlike lab-based studies or self-reported methods, Contextual Inquiry captures authentic behaviors as they occur. This helps reveal workarounds, unconscious habits, and environmental factors that influence user behavior. 3. User-Centered Design and Focus The method places users at the center, ensuring solutions are tailored to their needs and preferences. 4. Reduced Risk and Costs By identifying real-world user behaviors and challenges, Contextual Inquiry increases the likelihood that resulting solutions, products, processes, and policies meet user needs. 5. Informed Strategy Insights from contextual inquiry help prioritize users’ needs and challenges, identify new opportunities, and ensure alignment of product and strategy roadmaps with market demands. 6. Empathy Building Direct observation helps teams develop empathy for users by experiencing and understanding their challenges firsthand. Use Cases and an Idea Delta Think uses a Contextual Inquiry methodology to apply the principles above in several different types of projects: Understanding specialized work processes and designing complex systems or workflows Exploring new product opportunities Redesigning existing products Informing processes and policies One way Delta Think can use Contextual Inquiry to help publishers is around the use of AI by researchers and authors. For example, before developing any guidelines, it is critical that publishers first understand how these tools are being used. Using Contextual Inquiry to observe how researchers and authors are currently using AI allows you to build policies that address specific use cases and provide meaningful guidelines based on actual behaviors. At Delta Think, we know how powerful a tool Contextual Inquiry can be for creating a user-centered culture grounded in decisions based on real-world insights and observations. We specialize in uncovering evidence for our clients, discovering what that evidence means for them, and using the knowledge gained to build customer-driven products, policies, and actionable business and publishing strategies. Ready to start the conversation? Please reach out today to discuss how our market research expertise, including Contextual Inquiry, can help your organization unlock key insights to support development and growth.