Company lists · Data refreshed September 2026
Top 25 Call center optimization firms worldwide
RevenueBase identified 4,259 call center optimization firms worldwide as of September 2026 and tracks 224,968 professional contacts across them, including 25,175 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.
This list covers call center optimization firms worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 2026. Country and city lists for call center optimization firms follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest call center optimization firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 30,990 contacts → | ||||
Indirect evidence “Foundever® is the next-generation service leader reinventing customer experience (CX).” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 2 | 20,095 contacts → | ||||
Indirect evidence “A AeC é apontada consistentemente como a líder brasileira na entrega de soluções de experiência do cliente e gestão de processos terceirizados.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 3 | 17,310 contacts → | ||||
Indirect evidence “iQor is a trusted partner in customer experience solutions for global brands and a portfolio company of Mill Point Capital.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 4 | 14,976 contacts → | ||||
Indirect evidence “A global customer experience (CX) management solutions provider, Startek® delivers best-in-class omnichannel CX, digital transformation and enterprise tech services for leading…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 5 | 6,167 contacts → | ||||
Indirect evidence “Bir Turkcell grup şirketi olarak yılında kurulduğumuzda amacımız hep eşsiz bir müşteri deneyimi yaşatmaktı.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 6 | 4,785 contacts → | ||||
Indirect evidence “At Fusion CX, we revolutionize customer experience by blending innovative technology and human connection.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 7 | 4,126 contacts → | ||||
Strong evidence “Mais que call center: soluções que transformam o seu negócio e a jornada dos clientes!” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 8 | 3,122 contacts → | ||||
Indirect evidence “Email: info@Telvista.com Telvista is a premier provider of contact solutions that drive customer loyalty and create competitive advantage for our clients.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 9 | 2,774 contacts → | ||||
Strong evidence “Advanced Call Center Technologies, LLC (ACT) is a premier provider of domestic (USA), near shore and far shore outsourced call center services to the financial services, mortgage…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 10 | 2,552 contacts → | ||||
Indirect evidence “Com 19 anos de experiência em CX e BPO, somos consultivos e entregamos soluções personalizadas que conectam pessoas e tecnologia para impulsionar seus resultados.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 11 | 2,221 contacts → | ||||
Partial evidence “Somos la compañía líder en Servicios Next Gen de Contact Center, Business Process Outsourcing (BPO) y Customer Experience (CX).” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1,990 contacts → | ||||
Indirect evidence “Sitel Philippines (formerly SYKES).” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1,777 contacts → | ||||
Indirect evidence “OP360, part of iQor CXBPO™, is a trusted partner in intelligent customer experience solutions for global brands.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 14 | 1,764 contacts → | ||||
Partial evidence “InfoCision is an award-winning contact center partner trusted by leading brands for over 40 years.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 15 | 1,225 contacts → | ||||
Partial evidence “We deliver tailored Contact Center and Back Office solutions to our strategic partners, leveraging advanced technology and high quality standards to elevate customer experiences…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 16 | 1,198 contacts → | ||||
Strong evidence “The Office Gurus (TOG) is a global call center and business process outsource provider of customer care, telemarketing, lead generation, appointment setting, order entry, accounts…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 17 | 1,076 contacts → | ||||
Partial evidence “Even the markets know that we’re the good call’!” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 18 | 983 contacts → | ||||
Partial evidence “MCI is a global leader in tech-enabled business services, simplifying contact center outsourcing for brands worldwide.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 19 | 902 contacts → | ||||
Strong evidence “Our Company Inktel is a leading business process outsourcer that specializes in creating personalized call center solutions which enable our clients to increase market share…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 20 | 883 contacts → | ||||
Indirect evidence “If you are interested in growing your business or increasing efficiency, AnswerNet has the expertise, technology, and people to help you take your company to new heights!” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 21 | 878 contacts → | ||||
Indirect evidence “Decades of expertise distilled into innovative workforce tools.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 22 | 877 contacts → | ||||
Indirect evidence “CBE Companies is the parent organization of CBE Customer Solutions and CBE Group.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 23 | 867 contacts → | ||||
Indirect evidence “Virtual Staffing Solutions (VSS), a Waterstone Company We are not a recruiting firm or placement agency.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 24 | 792 contacts → | ||||
Indirect evidence “Focus was founded in 1995.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 25 | 708 contacts → | ||||
Indirect evidence “ClearSource at its core is a customer experience company.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: call center optimization firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names call center optimization firms.
- Partial evidence
- Its own public description names part of call center optimization firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name call center optimization firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
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Call center optimization firms worldwide at a glance
As of Sep 27, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among call center optimization firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for call center optimization firms are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “call center optimization firms”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names call center optimization firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among call center optimization firms, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 25,175 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 27, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Call center optimization firms by location
19 lists · largest firstEvery Call center optimization firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Call center optimization firms based in the United States886
- Call center optimization firms based in India224
- Call center optimization firms based in Brazil173
- Call center optimization firms based in the United Kingdom135
- Call center optimization firms based in Canada123
- Call center optimization firms based in Italy101
- Call center optimization firms based in the Philippines99
- Call center optimization firms based in Germany94
- Call center optimization firms based in Mexico88
- Call center optimization firms based in Spain76
- Call center optimization firms based in France63
- Call center optimization firms based in Türkiye63
- Call center optimization firms based in the Netherlands56
- Call center optimization firms based in South Africa55
- Call center optimization firms based in Argentina48
- Call center optimization firms based in Australia46
- Call center optimization firms based in Poland38
- Call center optimization firms based in Israel32
- Call center optimization firms based in Chile29
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names call center optimization firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many call center optimization firms are there worldwide?
RevenueBase identified 4,259 call center optimization firms worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Foundever, headquartered in Miami, tops this list with the largest team on record.
Which country has the most call center optimization firms?
The United States leads with 886 companies, followed by India (224) and Brazil (173). Every call center optimization firms list by country and city is linked on this page.
Which city has the most call center optimization firms?
Sao Paulo leads with 58 headquartered companies, followed by Lahore (51) and Rawalpindi (45).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 25,175 verified decision-maker contacts tracked across these 4,259 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 27, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.