Amazon Book Sales Trends on PublishDrive

Understanding Amazon book sales trends from2025 is essential for every independent author and publisher. Amazon still anchors independent publishing — but the shape of that dominance is shifting fast.

In 2025, print-on-demand expanded quicker than ebooks, Audible's growth was nearly flat, and the fastest-growing Amazon territories are now in continental Europe. Amazon also added new print markets there.

Here is what PublishDrive's 2025 distribution data reveals about how Kindle, Audible, and Amazon Print-on-Demand are performing for independent authors and publishers.

Ready to act on these insights? Explore PublishDrive's global distribution tools and start reaching more readers across Amazon and 400+ retailers today.

"The independent publishing ecosystem is no longer a single-format, single-market story. In 2025, we saw authors and publishers who diversified across formats and geographies substantially outperform those who relied on a single channel. The data doesn't lie: print is where momentum is, and Europe is where the next wave of growth is building."

Kinga Jentetics, CEO of PublishDrive, speaking at the 2026 PublishDrive Market Intelligence briefing

About the Data

All figures in this report come from aggregated, anonymized transactional sales data collected through PublishDrive's global distribution network across the full calendar year 2025. PublishDrive is a Budapest-based global ebook and print distribution platform serving thousands of independent authors and publishers in over 100 countries.

PublishDrive distributes to more than 400 retailers and library systems — including Amazon, Apple Books, Kobo, Google Play, and Ingram. This analysis reflects PublishDrive ecosystem performance only and does not represent the entire global Amazon book market.

For full methodology, see the PublishDrive Market Intelligence Report 2026. You can also explore related data in our self-publishing trends overview.

Amazon's Internal Format Mix: Kindle Dominates, Print Accelerates

When you look inside Amazon's share of PublishDrive sales, the format breakdown tells a sharper story than the headline 77% figure alone. Ebooks remain the biggest part of the Amazon ecosystem for independent authors — but print is no longer a quiet supporting format.

Why Is Print's Share Rising Inside Amazon?

In 2024, Amazon Print-on-Demand represented 24% of total PublishDrive Amazon sales revenue. That figure jumped to 30% in 2025 — a six-percentage-point shift in a single year.

Amazon remains structurally dominant for self-publishing, but the internal growth engine is increasingly print. According to PublishDrive's aggregated 2025 data, overall print revenue across the network grew +75% year-over-year — the strongest expansion of any single publishing format. This is one of the clearest Amazon book sales trends 2025 to watch.

Amazon's European Print-on-Demand Expansion

Amazon has expanded its Print-on-Demand marketplace footprint in Europe. Paperback and hardcover titles are now available directly on Amazon.nl (Netherlands), Amazon.pl (Poland), Amazon.se (Sweden), Amazon.ie (Ireland), and Amazon.com.be (Belgium) — as documented in Amazon Kindle Direct Publishing's official help documentation.

This adds to established print marketplaces in the US, UK, Germany, France, Spain, and Italy. The total is now fourteen Amazon print marketplaces for paperback and twelve for hardcover.

This expansion matters for independent authors and self-publishers. Readers in the Netherlands, Poland, and Sweden can now buy self-published print books through their local Amazon storefront — without ordering through Amazon.de or Amazon.co.uk. This strengthens the economics of going wide in continental Europe, with titles discoverable, priced in local currency, and fulfilled locally.

Add that to PublishDrive's data showing Amazon Print growth of +211% in France, +249% in Spain, and +141% in Italy year-over-year in 2025, and the picture is clear. Amazon is actively building its European POD infrastructure to match demand. The Netherlands, Poland, Sweden, Ireland, and Belgium are the next territories where independent print revenue is likely to grow meaningfully through 2026.

For more context on global distribution strategy, see our guide to going wide as an independent author.

Amazon Kindle: Genre Growth and the Shift Toward Non-Fiction

Amazon Kindle ebook sales through PublishDrive in 2025 show a market where non-fiction categories are accelerating fast. Several fiction mainstays remain steady.

The genres below are ordered by absolute revenue contribution, with year-over-year growth shown for each. Data reflects aggregated sales from PublishDrive-distributed titles across all Amazon Kindle international stores.

The pattern matches the broader PublishDrive Market Intelligence Report 2026 finding: non-fiction is growing faster than fiction overall across the self-publishing landscape. Part of this reflects the fact that PublishDrive distributed a significantly larger volume of quality non-fiction content from publishers and authors in 2025 than in prior years.

Categories tied to expertise, education, and analysis — History, Education, Language Arts, Psychology, Science, Foreign Language Study — are recording triple- and quadruple-digit acceleration on Amazon Kindle. This Amazon book sales trend for 2025 aligns with broader reader behavior shifts toward practical and knowledge-driven content.

Key Kindle Genre Highlights for Independent Authors

Here are the standout Kindle categories from PublishDrive's 2025 self-publishing data:

• Language Arts & Disciplines: +1,492% — the fastest-growing ebook niche on Kindle in 2025
• Family Life: +1,375% — strong reader demand for personal and practical content
• History: +811% — one of the biggest surprises in the non-fiction acceleration story
• Education: +691% — consistent with the expertise-content trend across all Amazon formats
• Thrillers: +326% — the standout fiction category, showing Amazon Kindle over-indexes on genre fiction
• Mystery & Detective: +136% — steady, strong performer for self-published fiction authors

These figures reinforce a clear takeaway: independent authors publishing non-fiction expertise content are capturing the biggest gains in the Amazon Kindle book sales trends of 2025.

Audible: Romance and Mystery Surge, but Total Audiobook Growth Is Flat

Audible remains the largest single audiobook retailer through PublishDrive. But the 2025 data shows why independent authors increasingly cannot rely on Audible alone.

Across the PublishDrive ecosystem, Audible's year-over-year revenue growth was just +1%. Meanwhile, Apple Audio grew +962%, Kobo Plus grew +150%, and Hoopla grew +69%. All figures are based on aggregated 2025 transactional data from PublishDrive's network.

Inside Audible itself, however, individual genres are moving in very different directions. This is critical for independent authors choosing which audiobook projects to prioritize.

Audible's Top-Performing Genres in 2025

Romance (+262%), Mystery & Detective (+119%), and Family & Relationships (+120%) are the breakout genres on Audible in 2025. That aligns with the broader finding that Romance and Mystery & Detective are structurally driving audiobook revenue for self-published titles.

Education audiobook revenue on Audible grew +673% — echoing the expertise-content pattern visible in Amazon Kindle data. This reinforces one of the defining Amazon book sales trends 2025: the rise of professional and instructional audio content.

The Impact of AI Narration on Audible

"AI narration... now account[s] for 23% of new releases [as of late 2025/early 2026]" and is the "industry's biggest disruption."

Author's Republic Trends (2026)

The emergence of AI narration is reshaping the audiobook production landscape. Lower production costs may help independent authors expand their Audible catalogs faster — a development that could significantly affect Amazon Audible book sales trends through 2026.

Learn more about audiobook distribution options in our audiobook distribution guide for independent authors.

Amazon KDP Print: Non-Fiction-Led and the Fastest-Growing Format for Self-Publishers

Amazon Print is where 2025's most dramatic genre-level acceleration shows up in PublishDrive's data. This is consistent with the broader finding that print revenue grew +75% year-over-year across PublishDrive — the strongest expansion of any publishing format tracked in the network.

For independent authors focused on Amazon book sales trends 2025, this is impossible to ignore.

Important data context: PublishDrive's print catalog is smaller than its ebook catalog and skews more heavily toward non-fiction. For self-publishing titles, non-fiction tends to be print-dominant — reference, professional, and category-driven content performs better in physical form than general trade fiction. Additionally, PublishDrive added several significant non-fiction independent publishers to its network in 2025, which contributes to the concentration of non-fiction growth signals in the Amazon KDP Print data below. Read absolute growth percentages with this catalog composition in mind.

KDP Print Genre Breakdown

The dominance of non-fiction in Amazon KDP Print is unmistakable. Law (+6,977%), Philosophy (+2,523%), Poetry (+1,528%), Self-Help (+520%), Nature (+413%), Political Science (+396%), Psychology (+318%), and Education (+284%) all saw extraordinary expansion.

Fiction in print, by contrast, declined 15%. This reinforces a key pattern: for self-published catalogs on Amazon, print demand is concentrated in reference, expertise, and intellectually dense non-fiction. This represents one of the most significant Amazon book sales trends 2025 — the bifurcation of format preference by genre within the Amazon KDP ecosystem.

Case Study Snapshot: Non-Fiction Print Growth in Action

To illustrate the real-world impact, consider a typical non-fiction independent publisher that joined PublishDrive's network in 2025. With titles in Psychology, Self-Help, and Education distributed through Amazon KDP Print, this type of publisher saw triple-digit revenue growth within six months of joining.

The combination of Amazon's expanding European print infrastructure and strong reader demand for expertise content created a powerful growth opportunity. This pattern repeated across multiple publishers in PublishDrive's network throughout 2025 — making Amazon KDP Print one of the most compelling self-publishing distribution channels to prioritize for 2026.

For more on optimizing print distribution, visit our print-on-demand distribution page.

How Amazon's Format-Level Genre Performance Diverges from PublishDrive's Overall Self-Publishing Trends

PublishDrive's platform-wide 2025 data sets a clear baseline: fiction contributes 64% of sales and grew 26% year-over-year. Non-fiction contributes 36% and grew faster at 47%. Fantasy, Romance, Comics & Graphic Novels, Young Adult Fiction, and Mystery & Detective lead fiction. Religion, Computers, Health & Fitness, Business & Economics, and Self-Help lead non-fiction.

Each Amazon format tells a different story against this benchmark — an important insight for independent authors planning their publishing strategy for 2026.

Amazon Kindle: A Strong Mirror with Key Amplifications

Amazon Kindle largely mirrors the platform — with a few sharp exceptions. Most top genres grow at roughly the same pace on Kindle as they do platform-wide. The exceptions matter: Young Adult Fiction grows noticeably faster on Kindle than on the wider platform. Thrillers explode on Kindle at triple-digit growth despite not ranking in the platform-wide top 10.

In short, Kindle is a disproportionately strong channel for YA fiction and thrillers — a key insight in the Amazon Kindle book sales trends 2025 story.

Audible: A Category Inverter for Self-Publishers

Audible inverts several platform trends. Romance grew seventeen percent platform-wide — but on Audible it grew more than fifteen times faster. Audio is the standout channel for Romance demand among independent authors. Self-Help declined slightly platform-wide but grew solidly on Audible, suggesting audiobook listeners are keeping the category alive.

At the same time, Audible moves several categories in the opposite direction: Fantasy, Business & Economics, and Health & Fitness all declined on Audible while growing elsewhere. The takeaway is simple: Audible listeners have genuinely different tastes that independent authors must account for in their audiobook strategy.

Amazon KDP Print: A Non-Fiction Engine

Amazon KDP Print is the most divergent of the three formats — and the direction is clearly non-fiction. Nearly every non-fiction category grew faster in print than platform-wide, often by a wide margin. Philosophy, Political Science, Computers, and Self-Help all accelerated dramatically, with Self-Help completely reversing its platform-wide decline.

Fiction in print contracted, even though platform-wide fiction grew by more than a quarter. For independent catalogs on Amazon, print is where non-fiction expertise content is winning.

The Bottom Line for Independent Author Strategy in 2025

"Bestselling on PublishDrive" does not automatically mean "bestselling on Amazon." Kindle roughly mirrors platform patterns with YA and thriller amplification. Audible operates as a category-inverter where Romance dominates and several non-fiction lifestyle categories decline. KDP Print is a non-fiction engine where fiction is shrinking.

The format you prioritize on Amazon should be driven by the genre you publish — not the other way around. To explore how to build a multi-format strategy, see our multi-format publishing strategy guide.

Authors vs. Publishers: A Different Story in Every Amazon Format

One of the clearest structural findings from PublishDrive's 2025 Amazon data is that contributor dominance looks completely different depending on format. There is no single "Amazon strategy" for independent publishing. There is a Kindle strategy, an Amazon Print strategy, and an Audible strategy — each with distinct competitive dynamics for authors versus publishers.

Amazon Kindle Is Publisher-Dominant

92% of Amazon ebook sales through PublishDrive come from publishers. Just 8% come from independent authors. Platform-wide across all ebook retailers, PublishDrive authors hold 14% ebook share — meaning independent authors are slightly underweight on Amazon Kindle relative to their aggregate ebook performance.

The gap has narrowed each year as author ebook sales strengthen — but publishers still hold a clear scale advantage on Kindle.

Amazon Print Is Author-Dominant

On Amazon KDP Print, 61% of print-on-demand book sales come from independent authors and 39% from publishers. This mirrors the platform-wide POD pattern, where authors represent the majority of self-publishing print revenue.

Year-over-year POD growth was remarkably symmetrical: authors +75%, publishers +77%. Amazon Print expansion is broad-based rather than concentrated in one contributor segment. Source: PublishDrive aggregated 2025 sales data.

Audible Is Strongly Author-Dominant

73% of Audible sales through PublishDrive come from independent authors. Just 27% come from publishers. This is mainly a catalog effect. Many publishers face rights-related constraints for audiobook production — and the same applies to print-on-demand.

Their audio and POD catalogs are much smaller than their ebook catalogs. Independent authors, with more flexible rights control over their self-published works, dominate these formats.

Structural Takeaway for Self-Publishing Strategy

For a publisher, Amazon Kindle is the natural core of the Amazon distribution strategy. For an independent author, Amazon KDP Print and Audible represent disproportionately large revenue opportunities relative to their ebook footprint.

One Amazon strategy does not fit both contributor types. Understanding this distinction is central to optimizing self-publishing revenue based on Amazon book sales trends 2025 and beyond. Explore how PublishDrive helps both authors and publishers maximize Amazon revenue through our platform overview.

Amazon's Bestselling Countries for Ebooks, Audiobooks, and Print in 2025

Amazon is a multi-market retailer. The 2025 PublishDrive data reveals where absolute revenue scale sits versus where growth is accelerating fastest for independent authors. The tables below are ordered by sales value, with year-over-year growth shown for each country.

All data comes from aggregated 2025 transactional sales across PublishDrive's distribution network.

Amazon Kindle Ebook: Bestselling Countries by Revenue (2025, PublishDrive Data)

Every top-20 Amazon ebook market posted positive growth in 2025 for independent authors distributing through PublishDrive. The United States anchors scale with 27% growth. But acceleration is strongest in Mexico (+75%), Brazil (+64%), Italy (+61%), and France (+57%).

This geographic broadening echoes the platform-wide Market Intelligence Report finding that growth in self-publishing is increasingly distributed across continental European and Latin American territories — not concentrated in English-speaking core markets. This is one of the defining Amazon book sales trends 2025.

For a deeper look at reaching international readers, see our international book distribution guide.

Audible: Country-Level Performance (2025, PublishDrive Data)

The Audible country data is volatile for self-publishing revenue planning. The US — Audible's largest market — declined 10%. The UK nearly doubled (+99%). Australia grew 74%. Germany expanded 43%.

Extremely high growth rates in Spain, Italy, Japan, and Brazil reflect small catalog bases in these territories. New title additions by independent authors produce large percentage changes from a low base.

Amazon KDP Print: Country-Level Performance (2025, PublishDrive Data)

Amazon KDP Print is the most uniformly positive of the three Amazon formats by geography. Every top market grew double- or triple-digits in 2025. Spain (+249%) and France (+211%) lead acceleration — consistent with Amazon's expanding print infrastructure in continental Europe.

The US remains the scale anchor with +75% growth, reflecting the combined strength of America's print-on-demand self-publishing market. These geographic signals are among the most actionable Amazon book sales trends 2025 for independent authors targeting European readers.

What the 2025 Amazon Data Means for Independent Publishing Strategy

Three structural signals emerge from PublishDrive's 2025 Amazon data. Each one matters for any independent author or publisher planning distribution strategy for 2026.

1. Amazon Is Still the Core — But It Is No Longer the Complete Picture

77% revenue concentration on Amazon means Amazon remains indispensable for independent authors. At the same time, Apple Audio's +962% growth, Tolino's +553% expansion, Kobo Plus's +150% acceleration, and Ingram Print's +96% growth all show that meaningful revenue acceleration is happening outside Amazon.

Wide distribution is not a theoretical hedge. In 2025, it is where the highest growth rates were. Source: PublishDrive aggregated 2025 transactional data. Learn how to go wide effectively with our wide distribution vs. Amazon exclusive breakdown.

2. Format Strategy Inside Amazon Matters More Than Ever

Print is the fastest-growing Amazon format for self-publishers in 2025. Audiobook demand is accelerating platform-wide, but Audible's growth is flat. Kindle continues to anchor ebook revenue but is structurally publisher-heavy.

Independent authors with audiobook rights and a print-ready non-fiction catalog are best positioned to capture 2025–2026 growth within the Amazon ecosystem. This is a core finding in the Amazon book sales trends 2025 data.

3. Geographic Expansion Is Real and Accelerating

Amazon Print in Spain, France, Italy, and Japan. Amazon Kindle in Mexico, Brazil, and Italy. Audible in the UK and Australia. Growth in independent publishing is no longer confined to the US-UK axis.

For self-publishers with multilingual or translation-ready catalogs, these territories offer the fastest incremental upside inside the Amazon ecosystem. They also align directly with the 2025 self-publishing trend toward geographic diversification. Explore how PublishDrive supports multilingual publishing through our translation rights and self-publishing guide.

Format-Specific, Region-Specific, and Genre-Specific Strategy Outplays a Single Amazon Playbook

Compared to PublishDrive's platform-wide 2025 data, Amazon functions as a selective amplifier rather than a clean mirror of overall self-publishing trends. Kindle broadly tracks overall platform patterns but over-indexes on Young Adult Fiction and Thrillers.

Audible diverges most sharply on genre: Romance grows at many multiples of its platform-wide rate, Self-Help reverses its platform decline, and several non-fiction lifestyle categories that grow elsewhere actually contract. Amazon KDP Print tilts heavily toward non-fiction, with Philosophy, Political Science, Computers, and Self-Help all accelerating far beyond platform averages, while fiction in print contracts against a platform-wide fiction expansion.

Geographically, Amazon over-indexes on continental European growth — particularly in Spain, France, and Italy. This reinforces the PublishDrive Market Intelligence Report's broader finding that momentum in self-publishing is geographically broadening even as scale stays anchored in mature English-language markets.

The conclusion aligns with the 2026 report's central thesis: the clearest opportunities on Amazon for independent authors sit in format-specific, genre-specific, and region-specific strategies rather than a single Amazon playbook.

Understanding these Amazon book sales trends 2025 is the first step. Acting on them — through smarter format choices, genre targeting, and geographic expansion — is what separates high-performing independent authors from the rest.

Ready to put these insights to work? Start your free PublishDrive account today and distribute your books to Amazon Kindle, KDP Print, Audible, and 400+ other retailers — all from one powerful dashboard. Join thousands of independent authors already growing their global reach.

Frequently Asked Questions: Amazon Book Sales Trends 2025 for Independent Authors

How much of independent book sales revenue comes from Amazon?

Amazon.com and Amazon Print together accounted for 77% of total book sales revenue across PublishDrive in 2025. Within PublishDrive's Amazon ecosystem, 74% of Amazon sales are ebooks, 24% are print, and 4.5% are audiobooks via Audible.

These figures confirm Amazon's role as the dominant digital book retailer and self-publishing marketplace. Source: PublishDrive Market Intelligence Report 2026, based on aggregated transactional data covering the full 2025 calendar year.

What share of ebook sales happen on Amazon Kindle?

Through PublishDrive in 2025, 71.5% of all ebook sales happened on Amazon Kindle. Amazon remains the leading digital reading platform for independent publishers and self-published authors.

However, growth is increasingly visible across alternative retailers like Kobo, Tolino, and regional retail alliances — a notable self-publishing trend that authors should monitor for 2026 planning. For context, see our ebook store list.

Is Audible still the largest audiobook retailer for independent authors?

Yes — Audible remains the largest audiobook retail channel within PublishDrive's distribution network. However, its revenue growth was only +1% year-over-year in 2025. Rival platforms showed much faster gains: Apple Audio (+962%), Storytel, and Kobo Plus all accelerated substantially.

This shift signals growing diversification in the audiobook retail landscape for self-published authors — and makes multi-platform audio distribution increasingly important when reviewing Amazon book sales trends 2025 and planning for 2026.

What percentage of print-on-demand growth comes from Amazon?

Amazon Print revenue grew 71% year-over-year in 2025 through PublishDrive — making it one of the fastest-growing self-publishing distribution channels available. Overall print revenue across PublishDrive grew +75% year-over-year, the strongest expansion of any publishing format tracked in 2025.

This print-on-demand surge is one of the most important Amazon book sales trends 2025 for independent authors to understand. Source: PublishDrive aggregated 2025 transactional sales data.

Are authors or publishers dominating Amazon sales?

It depends on the format. On Amazon Kindle through PublishDrive, 92% of sales come from publishers and only 8% from independent authors. On Amazon Print (KDP Print), 61% of book sales come from independent authors. On Audible, 73% of sales come from independent authors.

Format and distribution strategy significantly shape contributor performance — a key insight for any self-published author choosing where to focus their Amazon efforts in 2025 and 2026.

Which countries are the top markets for Amazon ebooks in 2025?

The United States leads by revenue value, followed by the United Kingdom, Germany, Australia, and Canada. The fastest growth is in Mexico (+75%), Brazil (+64%), Italy (+61%), France (+57%), Ireland (+53%), and Spain (+51%).

These numbers show that Amazon ebook demand for self-published titles is expanding well beyond core English-language markets. Geographic diversification is one of the most actionable Amazon book sales trends 2025 for independent authors targeting new readers.

What are the fastest-growing ebook genres on Amazon Kindle in 2025?

Through PublishDrive, the fastest-growing Amazon Kindle ebook categories in 2025 included Language Arts & Disciplines (+1,492%), Family Life (+1,375%), History (+811%), Education (+691%), Science (+351%), Thrillers (+326%), Contemporary Women (+306%), and Foreign Language Study (+243%). Mystery & Detective also expanded 136%.

Non-fiction expertise categories dominated the acceleration chart — reinforcing the broader Amazon Kindle book sales trend for 2025: reader demand is shifting toward practical, knowledge-driven digital content.

Is Amazon expanding its print business in Europe?

Yes. As of April 2026, Amazon added five new European print-on-demand marketplaces: Amazon.nl (Netherlands), Amazon.pl (Poland), Amazon.se (Sweden), Amazon.ie (Ireland), and Amazon.com.be (Belgium). This expansion — documented in Amazon KDP's official help documentation — reinforces Amazon's growing role in independent print distribution.

It complements Ingram, which grew 96% year-over-year through PublishDrive in 2025. For independent authors targeting European readers, this is a significant structural opportunity in 2026 and a key part of the Amazon KDP Print sales trends 2025 story.

How can independent authors distribute to Amazon Kindle, Audible, and Amazon Print?

Independent authors and publishers can distribute to Amazon Kindle, Audible, and Amazon KDP Print through an aggregator like PublishDrive. PublishDrive manages metadata, pricing, and sales reporting across Amazon alongside Kobo, Apple, Tolino, Google Play, subscription services, and library networks — all from a single dashboard.

Authors can also sign up to Amazon KDP and Audible directly without going through a distributor. Learn more about your options in our self-publishing distribution options overview.

What self-publishing trends defined 2025 Amazon book sales?

The defining Amazon book sales trends 2025 — as measured by PublishDrive's aggregated distribution data — were: (1) print-on-demand outpacing ebook growth within the Amazon ecosystem, rising from 24% to 30% of Amazon revenue; (2) non-fiction accelerating faster than fiction across Kindle and KDP Print; (3) geographic expansion into continental Europe and Latin America; and (4) Audible's flat growth contrasting with explosive audiobook growth on Apple Audio and Kobo Plus.

Together, these trends signal a more format-diversified, geographically distributed self-publishing market in 2025 and beyond.

Why is non-fiction growing faster than fiction on Amazon KDP Print?

Several factors drive non-fiction's print dominance in the self-publishing market. Readers of reference, professional, and educational content prefer physical books for annotation and repeated use. Non-fiction also tends to have longer commercial shelf lives than fiction.

Additionally, PublishDrive's print catalog skews toward non-fiction, which amplifies these signals in the data. PublishDrive also added significant non-fiction independent publishers to its network in 2025, which contributes to the concentration of non-fiction growth in the Amazon KDP Print data.

Independent authors publishing non-fiction should seriously consider print-first distribution strategies on Amazon for 2026 — one of the most practical takeaways from the Amazon book sales trends 2025 analysis. For more guidance, see our non-fiction self-publishing tips for independent authors.

Data source: Aggregated 2025 transactional sales data from PublishDrive's global distribution network, reflecting sales activity from self-published authors and independent publishers distributed to Amazon.com, Amazon international Kindle stores, Amazon KDP Print, and Audible. Data collection methodology: PublishDrive aggregates anonymized sales reporting data received from retail partners on a title-by-title basis, normalized across currencies using monthly average exchange rates, and categorized by genre using BISAC subject codes as reported at time of distribution. This analysis does not represent the entire global Amazon book market; it reflects PublishDrive ecosystem performance only. Year-over-year comparisons are January–December 2024 versus January–December 2025. For broader market context and full methodology, see the PublishDrive Market Intelligence Report 2026.