RocketSDR
Sign in
B2B intent & visitor ID · updated Nov 2026

Companies using Apollo.io: 3,925 found

We found Apollo.io running on 3,925 company websites. The biggest group is Software Development (28%), 50% are headquartered in United States, and 2.4% have more than 1,000 employees. Teams that use Apollo.io are 11.8× more likely than the average company to also use Warmly.

Apollo.io by Apollo.io — Sales intelligence platform, incl. its website-visitor tracking tag.
3,925
companies using Apollo.io
2.4%
have 1,000+ employees
70
countries
28%
Software Development

Who uses Apollo.io

Every company we found, grouped by industry. 1 companies without a listed industry are left out of this chart.

By industry
  • Software Development 1,109 · 28%
  • IT Services and IT Consulting 459 · 12%
  • Technology, Information and Internet 386 · 9.8%
  • Advertising Services 180 · 4.6%
  • Financial Services 143 · 3.6%
  • Information Technology & Services 105 · 2.7%
  • Everything else 1,542 · 39%

Each square is 4 companies.

By company size (employees)
  • 17 · <1%
  • 2–10560 · 14%
  • 11–501,714 · 44%
  • 51–2001,191 · 30%
  • 201–500252 · 6.4%
  • 501–1,000105 · 2.7%
  • 1,001–5,00075 · 1.9%
  • 5,001–10,00010 · <1%
  • 10,001+10 · <1%
By headquarters country
  • United States1,917 · 50%
  • India680 · 18%
  • United Kingdom298 · 7.8%
  • Canada183 · 4.8%
  • Australia77 · 2%
  • Germany56 · 1.5%
  • Netherlands55 · 1.4%
  • United Arab Emirates46 · 1.2%
  • France44 · 1.2%
  • Brazil39 · 1%

What else Apollo.io users run

How much more likely a Apollo.io user is to also run each tool, compared with the average of the 281,225 companies across our technology pages. 11.8× means Warmly shows up 11.8 times as often among Apollo.io users as among everyone else.

Apollo.io users, largest first

The 25 companies with the biggest LinkedIn following, with the evidence behind each one. The other 3,900 are a free account away.

CompanyIndustrySizeHQSeen onEvidence
Thomson Reuters
tr.com
Software Development10,001+CanadaWebsiteAdobe Launch: assets.apollo.io/micro/website-tracker/track
TASC Outsourcing
tascoutsourcing.com
Human Resources Services10,001+United Arab EmiratesWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
Compunnel Inc.
compunnel.com
Business Consulting and Services5,001–10,000United StatesWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
Tide
tide.co
Financial Services1,001–5,000United KingdomWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
European Tech Recruit
eu-recruit.com
Staffing and Recruiting51–200United KingdomWebsiteLoads assets.apollo.io
Mitchell Martin Inc.
mitchellmartin.com
Staffing and Recruiting501–1,000United StatesWebsiteLoads assets.apollo.io
National Bank of Kuwait
empli.fi
Banking1,001–5,000KuwaitWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
We Are Social
wearesocial.com
Advertising Services1,001–5,000United KingdomWebsiteLoads assets.apollo.io
Hudson Talent Solutions
hudsontalent.com
Staffing and Recruiting1,001–5,000United StatesWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
Pursuit
pursuitsalessolutions.com
Staffing and Recruiting51–200United StatesWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
INSIDEA
insidea.com
Technology, Information and Internet51–200United StatesWebsiteLoads assets.apollo.io
Twine
twine.net
Software Development11–50United KingdomWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
Blueground
theblueground.com
Real Estate501–1,000United StatesWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
Centific
centific.com
Software Development5,001–10,000United StatesWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
Sterling Engineering
sterling-engineering.com
Engineering Services501–1,000United StatesWebsiteLoads assets.apollo.io
JCDecaux
jcdecaux.com
Advertising Services10,001+FranceWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
QX Global Group
qxglobalgroup.com
Outsourcing and Offshoring Consulting1,001–5,000United KingdomWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
VLink Inc
vlinkinfo.com
Software Development501–1,000United StatesWebsiteLoads assets.apollo.io
MathCo
mathco.com
Business Consulting and Services1,001–5,000United StatesWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
HSO
hso.com
IT Services and IT Consulting1,001–5,000NetherlandsWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
ideaHelix
ideahelix.com
IT Services and IT Consulting201–500United StatesWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
Celebal Technologies
celebaltech.com
Information Technology & Services1,001–5,000IndiaWebsiteLoads assets.apollo.io
TekStream Solutions
tekstream.com
IT Services and IT Consulting51–200United StatesWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
Wati
link.wati.io
Software Development201–500MalaysiaWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
Novac Technology Solutions
novactech.com
Technology, Information and Internet1,001–5,000IndiaWebsiteTag manager: assets.apollo.io/micro/website-tracker/tracker.i
3,900 more Apollo.io users

Filter by industry, size and country, find the decision makers, and turn the list into a campaign in RocketSDR. Free to start.

See all 3,925 companies →
Building something?Pull this list via API: who_uses_tech on gtm.dev →

How we saw Apollo.io

Each company is counted once, under the strongest evidence we found for it.

Website evidence
  • Tag manager1,703 · 43%
  • Script tag1,095 · 28%
  • Network request1,060 · 27%
  • Script body37 · <1%
  • DNS record15 · <1%
  • Page text15 · <1%

Apollo.io usage: common questions

How many companies use Apollo.io?

We found Apollo.io running on 3,925 company websites, as of 3 November 2026. This counts companies we can tie to a LinkedIn company page, so it is a floor, not a market total.

Which well-known companies use Apollo.io?

By LinkedIn following, the largest include Thomson Reuters, TASC Outsourcing, Compunnel Inc., Tide and European Tech Recruit. The table above lists more, with the evidence for each.

What industries use Apollo.io the most?

Software Development (1,109 companies), IT Services and IT Consulting (459) and Technology, Information and Internet (386) lead, out of 3,924 companies with a known industry.

Which countries have the most Apollo.io users?

United States (50%), India (18%) and United Kingdom (7.8%). We see Apollo.io at companies headquartered in 70 countries.

What tools do Apollo.io users also use?

Compared with the average company in our data, Apollo.io users are most over-represented on Warmly (11.8×), Clearbit (7.7×), Clay (7.4×). The multiplier is how much more likely they are than average to run that tool too.

How do you know a company uses Apollo.io?

We load company websites and look for Apollo.io's fingerprints: the scripts and network requests it makes, its cookies and response headers, DNS records, and tags configured inside Google Tag Manager containers. A company is only counted when we can tie the domain or app to its LinkedIn company page, and shared domains (link shorteners, site builders) are excluded, so a domain scan of bit.ly never counts as evidence about a brand that links to it.

Can I export the full list of Apollo.io users?

Yes. Create a free RocketSDR account to filter all 3,925 companies by industry, size and country, find the right contacts, and start outreach. Developers can query the same data through the gtm.dev who_uses_tech API.

Sell to the 3,925 companies running Apollo.io

Every company on this page is a signal: a budget line, a team that buys tools like yours, and — if you compete with Apollo.io — a displacement target. RocketSDR finds the right people at each one and writes the outreach.

Build a Apollo.io list →Run a takeout campaign against Apollo.io

More b2b intent & visitor id data

Companies using 6sense1,587 companiesCompanies using Demandbase1,745 companiesCompanies using ZoomInfo2,615 companiesCompanies using Clearbit1,065 companiesCompanies using Clay792 companiesCompanies using Warmly663 companiesWho's preparing ChatGPT adsData studyOpenAI ads tag adoption

All technology data →