Companies Using Amazon S3

With 10+ years in web crawling and technographic data analysis, I've examined Amazon S3's footprint across our dataset of 469,944 active domains and 224,240 enriched company profiles (47.72% match rate). This analysis draws from our proprietary crawl data, LinkedIn company enrichment, and cross-referenced G2 review sentiment, as of our April 2026 crawl.

1. Growth trajectory

Amazon S3 launched on March 14, 2006 (Pi Day), AWS's first generally available service. Twenty years later, it stores over 500 trillion objects across hundreds of exabytes and handles 200 million requests per second, per AWS's own disclosures. AWS generated $128.7 billion in revenue in FY2025 (20% YoY growth, per Amazon's Q4 2025 earnings report), up from $107.6 billion in 2024. S3 sits at the foundation of most of that infrastructure spend. AWS also disclosed that S3 Intelligent-Tiering alone has saved customers over $6 billion compared to Standard storage pricing.

In our crawl data, S3 grew from a single detected domain in November 2005 to 418,638 active domains at its December 2024 peak. The most striking acceleration happened between mid-2020 and mid-2022, when active domains jumped from 75,763 to 217,379, a 2.87x increase driven by pandemic-era cloud migration.

The recent decline to 345,485 active domains by July 2025 deserves context. It doesn't signal reduced S3 adoption. Our crawl scope contracted during this period, and many S3 workloads shifted behind CloudFront or custom domains that mask the S3 origin. The total domains ever detected at 1,224,580 confirms S3's reach is far larger than any single crawl snapshot shows.

"The 2020-2022 growth spike isn't just cloud migration. It's the moment static asset hosting became the default for every new web project, and S3 was already there." - Mehmet Suleyman, Founder at TechnologyChecker.io

Sales Signal: S3's addressable market is still expanding. New businesses default to AWS, and the 20.51% of customers founded in the 2020s confirms a constant stream of new adopters. For sales teams, filtering by founding decade reveals which S3 customers are newest and most likely shopping for complementary tools.

2. Customer profile

Amazon S3's customer base skews heavily toward micro-businesses. 68.3% of companies have 1-10 employees, and a combined 84.5% have fewer than 50 staff. This isn't the enterprise-heavy distribution you'd expect from an AWS service. It reflects S3's role as foundational infrastructure: every developer who deploys a static site, stores user uploads, or hosts images on S3 creates a detection in our data.

The enterprise tail is real, though. 3,303 companies with 10,001+ employees use S3, including Deloitte, IBM, McDonald's, Samsung, and multiple government agencies (VA, U.S. Navy, USPS, Government of Canada). AWS's published case studies confirm Snap Inc. (1.5 trillion files, 2+ exabytes migrated), BBC (25 PB archived), BMW (1.3 PB of analytics data), Nasdaq, and Siemens (6 TB/day of cybersecurity logs) as major S3 customers. Our detection data independently validates Siemens, Samsung, and multiple others from this vendor-verified list. The detection URLs tell the story: these enterprises use S3 on specific subdomains (sds.accenture.com, creativehub.shell.com, campaigns.icicibank.com), not company-wide.

Age distribution adds another layer. 39.77% of S3 companies were founded in the 2010s, and 20.51% in the 2020s. Combined, 60.28% are digital-native companies under 16 years old. The 6.89% Pre-1960 cohort (companies like Siemens, founded 1847, and Shell, founded 1833) confirms legacy enterprises adopt S3 for specific digital workloads rather than wholesale cloud migration.

Sales Signal: Two distinct buyer personas emerge. The micro-business segment (68.3%) needs managed services, simplified pricing, and plug-and-play tooling. The enterprise segment (1.5% but disproportionately valuable) buys compliance, security, and integration. Sales teams should segment outreach by company size: cost optimization for small teams, governance and compliance for enterprises.

3. Industry and geographic concentration

Software Development leads at 6.71%, followed by Retail (4.80%), IT Services (4.40%), Real Estate (4.23%), and Technology/Internet (4.09%). No single industry exceeds 7%, making S3 the most horizontally distributed technology in our dataset. For context, Shopify sees Retail at 16.6% and Mailchimp sees similar concentration. S3 doesn't have a dominant vertical because every industry needs object storage.

Financial Services (3.85%) and Non-profit Organizations (2.02%) highlight the breadth. We found Bank of America, Citigroup, HSBC, Santander, Allianz, and AXA all using S3, six major financial institutions from four countries. The nonprofit presence includes government agencies (VA, USPS, Government of Canada) and healthcare organizations (Kaiser Permanente, CVS Health, HCA Healthcare).

Geographically, the United States accounts for 58.1% of S3 customers. This is high compared to other technologies in our dataset (Mailchimp is 33.8%, Shopify is around 50%). The UK at 9.1% and Brazil at 6.1% are distant second and third. English-speaking countries (US, UK, Canada, Australia) account for over 75%. Brazil's #3 position is notable, driven by AWS's Sao Paulo region (launched 2011) and Brazil's expanding tech sector.

Sales Signal: The horizontal distribution means every vertical is addressable. Regional data shows Europe is underrepresented relative to its economy. Germany (2.75%), France (2.03%), and Netherlands (1.90%) combined account for just 6.68%, below what their GDP share would predict. European markets may represent untapped opportunity, especially with AWS's Frankfurt and Paris regions offering data residency compliance.

4. Migration patterns

S3's migration data reveals net gains against every tracked competitor. Against GStatic Google Static Content, S3 gained 48,748 companies while losing 38,439, a 1.27:1 gain ratio. Against CloudFront, the flow is nearly balanced: 24,155 gained vs. 22,764 lost (1.06:1). This CloudFront corridor reflects architectural decisions rather than competitive switching: teams add or remove S3 direct hosting as they adjust their CDN strategy.

The most aggressive recent gains come from Google Cloud CDN: 3,179 of the 5,677 total gains happened in the last year alone, compared to 3,039 losses. This suggests an accelerating migration from Google Cloud to AWS storage for static hosting. Against Cloudflare JS, S3 gained 8,423 companies in the last year while losing 4,236, a 2:1 ratio that confirms S3's growing role as primary origin storage behind CDN layers.

"The CloudFront-S3 migration corridor is the most telling. It's not competition. It's architecture. Teams oscillate between serving directly from S3 and adding CloudFront caching based on traffic patterns and cost tradeoffs." - Mehmet Suleyman, Founder at TechnologyChecker.io

Sales Signal: Companies moving away from Google Cloud CDN to S3 represent a cross-sell opportunity. They've already decided to switch cloud providers for static hosting, so they're open to evaluating new tools across their stack. The CloudFront migration corridor creates demand for CDN optimization consultants who help companies decide between S3 direct hosting and CloudFront-cached delivery.

5. Technology ecosystem

Cloudflare Hosting (39.64%) is the dominant co-occurring technology, nearly 4x more common than the next entry. This pattern makes architectural sense: Cloudflare sits in front as DNS provider and edge cache, while S3 is the origin storage layer. The combination delivers global performance without AWS CloudFront pricing.

Hotjar (12.48%) and Microsoft Clarity (10.05%) are the top analytics co-occurrences, both heatmap and session recording tools. This suggests S3 customers skew toward product-led or conversion-focused businesses that invest in understanding user behavior. Google Analytics Classic (7.04%) is lower than expected, possibly because many S3 users have migrated to GA4, which we track separately.

The JavaScript framework distribution is revealing. AngularJS (8.57%) leads, which is surprising given AngularJS has been deprecated since 2021. This confirms many S3 deployments are for legacy applications still running older frontend stacks. Modern frameworks (Emotion at 4.70%, styled-components at 4.64%) represent the newer cohort of React-based applications using S3.

AWS has also been expanding S3's own capabilities. S3 Express One Zone, launched at re:Invent 2023, delivers 10x faster access and up to 80% lower request costs than Standard, targeting ML training and interactive analytics. At re:Invent 2025, AWS raised the maximum object size from 5 TB to 50 TB and launched S3 Vectors (native vector storage for AI workloads, sub-100ms query latency). S3 Tables (for Apache Iceberg analytics) arrived at re:Invent 2024. These expansions signal Amazon's push to make S3 a compute-adjacent data platform, not just storage.

Sales Signal: The AngularJS prevalence signals modernization opportunity. 8,567 S3 companies still run AngularJS and likely need frontend modernization services. The Cloudflare co-occurrence means S3 companies are already cost-conscious about CDN pricing; tools that optimize S3 storage costs or provide S3 alternatives would find a receptive audience.

6. G2 review signals

S3 holds a 4.6/5 rating across 941 G2 reviews as of early 2026. The top-cited strengths are scalability, durability (the 11-nines guarantee), and tight AWS ecosystem integration. With 76% of reviewers giving 5 stars, satisfaction is high but not unanimous.

The most cited pain point is pricing complexity. Users describe S3 billing as "a puzzle," with storage tiers, request fees, and egress charges all stacking up unpredictably. The steep learning curve aligns with our company size data: 68.3% of S3 users have 1-10 employees and probably lack dedicated cloud engineers. Data egress costs ($0.09/GB for the first 10 TB) are the most actionable criticism, and it explains why 39.64% of S3 customers also use Cloudflare. Cloudflare R2, an S3-compatible alternative launched in 2022, charges zero for egress and 35% less for storage ($0.015/GB vs. $0.023/GB), directly targeting this pain point.

Sales Signal: Three product opportunities emerge from the review data. First, S3 cost optimization tools targeting the pricing complexity complaint. Second, managed S3 services for the micro-business segment struggling with the learning curve. Third, alternative CDN/edge caching solutions that reduce S3 egress costs, which the Cloudflare co-occurrence already validates as a market need.

7. Key takeaways

1. Market position: S3 stores 500+ trillion objects and powers 469,944+ active domains in our crawl data. Its CDN category ranking (#16) understates its importance because it competes against purpose-built CDNs. AWS generated $128.7B in FY2025 revenue (per Amazon Q4 2025 earnings), and S3 sits at the foundation of that infrastructure.

2. Growth phase: Mature but still growing. The 2020-2024 acceleration brought S3 from 67K to 418K active domains. Recent decline reflects crawl scope changes, not reduced adoption.

3. Core customer: Digital-native micro-businesses (1-10 employees, founded after 2010) using S3 as default static storage. Enterprise adoption is real but concentrated on specific subdomains.

4. Competitive moat: AWS ecosystem lock-in. The top co-occurring technology is Cloudflare (not another AWS service), but S3's integration with Lambda, Athena, and 200+ AWS services creates switching costs that no CDN can replicate.

5. Key vulnerability: Pricing complexity and egress costs. Cloudflare R2 charges zero egress and 35% less for storage. Nearly 40% of S3 users already layer Cloudflare on top to reduce data transfer bills, and "pricing" is the #1 complaint across 941 G2 reviews.

8. Sales applications

Outreach template (cloud cost optimization): "We analyzed [Company]'s S3 usage across [detection URL] using TechnologyChecker.io's technographic data. Your current setup pairs S3 with [co-occurring CDN/analytics tool], a pattern we see in 39.64% of S3 deployments. Companies with this stack typically save 15-30% on data transfer by [specific optimization]. Would a 15-minute audit be useful?"

Targeting strategy on TechnologyChecker.io: Filter S3 companies by employee size 1-10 (68.3% of the base) and founding decade 2020s for the newest, fastest-growing segment. These companies are still building their cloud stack and are most receptive to complementary tools. For enterprise outreach, filter 10,001+ employees and cross-reference with the migration data to find companies actively switching CDN providers.

Competitive angle: The 5,677 companies gained from Google Cloud CDN (3,179 in the last year alone) represent businesses that just chose AWS over Google Cloud. They've made a platform decision and are likely evaluating new AWS-native tools. Target these recent migrators with AWS-specific integration pitches.

For the full dataset, explore all 224,240 enriched S3 company profiles at TechnologyChecker.io/technology/amazon-s3.