Top 100 Third Party Verification Companies
The Best of November 2026Looking for a top third party verification service?
This guide contains companies from all over the globe that excel in third-party verification. Their services vary from non-voice BPO/back-office services to voice services to transcription and they provide a multitude of other services your company may need. With all of these options, we know that it can be difficult to navigate the best company for you.
That's why we've created this list of the best third party verification companies for you to review. Read through company descriptions, former clients, and notable projects to find the best fit for your business.
List of the Best Third Party Verification Agencies
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1$1,000+250 - 999 employeesOakville, CanadaMartal Group is an answering service. They are located in Oakville, Canada; San Francisco, California and Uniondale, New York and have a midsize team that provides Call Center Services, Sales Outsourcing, and Email Marketing. The agency was launched in 2009.Read More
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BoschIndustries
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2Undisclosed10 - 49 employeesKing of Prussia, PASpecialty Answering Service is a small call center. They specialize in Call Center Services and Customer Service Outsourcing and were founded in 1985. The company is in King of Prussia, Pennsylvania.Read More
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3$1,000+1,000 - 9,999 employeesSanta Monica, CACustomer Service Outsourcing company Boldr. Is based in Santa Monica, California; Pasig, Philippines; Mérida, Mexico and Tacloban City, Philippines. The large team provides Customer Service Outsourcing, Call Center Services, Back Office Outsourcing, Employer of Record (EOR) Services, and more and was launched in 2016.Read More
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4$5,000+1,000 - 9,999 employeesKyiv, UkraineRead More
Everhelp is a result-as-a-service ecosystem for customer support outsourcing, aligning processes, AI automation, and trained agents around each client's targets. Founded in 2021, it has become a fast-growing business, ranking at the top of Clutch's Top 100 Fastest-Growing Companies list. They served 125+ clients with a stable 96% quality score and an 83%+ average of CSAT, backed by ISO 27001 and PCI DSS certificates and 8 industry awards.
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5$1,000+250 - 999 employeesDoylestown, PAHelpSquad, a Back Office Outsourcing company, is located in Doylestown, Pennsylvania. They offer Back Office Outsourcing, Call Center Services, and Customer Service Outsourcing and were founded in 2015.Read More
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Slinger BagIndustries
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6$1,000+250 - 999 employeesAfton, WYWOW24-7 is a Customer Service Outsourcing company. They are headquartered in Afton, Wyoming and have a midsize team. Their services include Customer Service Outsourcing, Call Center Services, and IT staff augmentation.Read More
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The App SolutionsIndustries
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7Undisclosed50 - 249 employeesToronto, CanadaFounded in 2019, 24H Virtual is a call center company. Their midsize team is headquartered in Toronto, Canada. Their services include Call Center Services, Customer Service Outsourcing, and Back Office Outsourcing.Read More
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8$1,000+1,000 - 9,999 employeesGurugram, IndiaRead More
MattsenKumar is a back office services provider based in Woodburn, Ore., with an office in Gurgaon, India. Founded in 2010, MattsenKumar's team of 364 employees offers voice/call center services and non-voice BPO/back office services.
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9$10,000+250 - 999 employeesSan Pablo City, PhilippinesCustomer Service Outsourcing company Big Outsource is based in San Pablo City, Philippines; Candelaria, Philippines and Santo Tomas, Philippines. The midsize team specializes in Customer Service Outsourcing, Back Office Outsourcing, Call Center Services, and Finance & Accounting Outsourcing (FAO). The firm was founded in 2014.Read More
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10Undisclosed1,000 - 9,999 employeesLos Angeles, CACallbox is a large Sales Outsourcing company based in Los Angeles, California; Singapore, Singapore; Ultimo, Australia and Medellín, Colombia. Launched in 2004, the team offers Sales Outsourcing, Customer Service Outsourcing, Back Office Outsourcing, and Call Center Services.Read More
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Alima TechnologiesIndustries
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11$5,000+1,000 - 9,999 employeesCebu City, PhilippinesLaunched in 2008, Select VoiceCom is a call center. They are in Cebu City, Philippines; Davao City, Philippines and Savannah, Georgia and have a large team. The company focuses on Call Center Services, Customer Service Outsourcing, Sales Outsourcing, Finance & Accounting Outsourcing (FAO), and more.Read More
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12$1,000+1,000 - 9,999 employeesChicago, ILEstablished in 2017, Hugo Inc. Is a Customer Service Outsourcing company. The agency specializes in Customer Service Outsourcing, Call Center Services, Back Office Outsourcing, Content Moderation Services, and more and has a large team. The agency is in Chicago, Illinois and Lagos, Nigeria.Read More
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13$50,000+10,000+ employeesWei Fang Shi, ChinaWelsend is a Customer Service Outsourcing company founded in 1993. They are headquartered in Wei Fang Shi, China; Taguig, Philippines; Cheng Du Shi, China and Rizhao, China and have a large team. Their services include Customer Service Outsourcing, Call Center Services, CRM consulting and SI, and Back Office Outsourcing.Read More
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14$5,000+250 - 999 employeesIași, RomaniaIntelligentBee is a Customer Service Outsourcing company. Founded in 2010, the midsize firm is headquartered in Iași, Romania. Their team offers Customer Service Outsourcing, Call Center Services, and Back Office Outsourcing.Read More
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Sendgrid.comIndustries
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15$1,000+1,000 - 9,999 employeesBengaluru, IndiaRead More
Flatworld Solutions is an outsourcing company headquartered in Princeton, N.J. Founded in 2006, they have a team of over 750 employees. The firm's international offices are based across India, the U.K, and the Philippines and has experience in nonvoice/ back office, transcription, and call center services. Their Clients mostly work in manufacturing, education, and healthcare industries.
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MSNIndustries
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16Undisclosed1,000 - 9,999 employeesNoida, IndiaPhone answering service Go4customer was established in 2004. Their large team is headquartered in Noida, India; Jaipur, India; Navi Mumbai, India and Bengaluru, India. Their services include Call Center Services, Customer Service Outsourcing, Market Research, and Sales Outsourcing.Read More
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MSMEIndustries
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17$1,000+250 - 999 employeesOrlando, FLXACT, an answering service company, was founded in 1996. Their midsize team is in Orlando, Florida and Unity, Maine. The agency specializes in Call Center Services, Customer Service Outsourcing, Back Office Outsourcing, and Staffing.Read More
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Culinary Institute of AmericaIndustries
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18$1,000+1,000 - 9,999 employeesNew York, NYAppointment Setter Online is a large Sales Outsourcing company. They offer Sales Outsourcing, Back Office Outsourcing, and Call Center Services and were established in 2010.Read More
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TeamGanttt Slalom Consulting curotec Upfront HealthcareIndustries
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19$1,000+1,000 - 9,999 employeesOutsource and Save is a large call center in Los Angeles, California; Los Angeles, California; Lynwood, California and West Covina, California. Established in 2018, the team provides Call Center Services, Back Office Outsourcing, Customer Service Outsourcing, and Sales Outsourcing.Read More
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20$1,000+50 - 249 employeesCall Masters BPO is a call center company. Launched in 2021, the team focuses on call center services. Their midsize firm is Sheridan, Wyoming-based.Read More
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21$50,000+1,000 - 9,999 employeesMedellín, ColombiaSolvo Global is a Back Office Outsourcing company. Founded in 2018, the large firm is headquartered in Chandler, Arizona; Medellín, Colombia and Duluth, Georgia. Their services include Back Office Outsourcing, Call Center Services, Finance & Accounting Outsourcing (FAO), Staffing, and more.Read More
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CenCal Insurance ServicesIndustries
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22$1,000+250 - 999 employeesChennai, India4D Global, an answering service, is based in Chennai, India and Scottsdale, Arizona. Launched in 2015, the midsize team specializes in Call Center Services, Back Office Outsourcing, and Sales Outsourcing.Read More
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23$1,000+50 - 249 employeesBengaluru, IndiaRead More
Unee Solutions is a business process outsourcing firm based in Stafford, Texas with additional assets in India and Israel. They were founded in 2007 and currently have a staff of 125 employees. Unee Solutions' solutions focus on lead generation and include both voice outsourcing and non-voice back office services.
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KernIndustries
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24$1,000+1,000 - 9,999 employeesKantipur Management Private Limited, a marketing strategy company, was launched in 2014. Their large team is headquartered in Kathmandu, Nepal; Lalitpur, Nepal and Lalitpur, Nepal and specializes in marketing strategy, corporate training, customer service outsourcing, and hr consulting.Read More
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25Undisclosed250 - 999 employeesTorreón, MexicoRemote Team Solutions is a Staffing company. Launched in 2014, the midsize firm is headquartered in Torreón, Mexico and Reno, Nevada. Their team offers Staffing, IT staff augmentation, Call Center Services, Back Office Outsourcing, and more.Read More
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Now Prop Preservation LLCIndustries
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26$1,000+50 - 249 employeesBerkeley, CARead More
Wing Assistant, a back office outsourcing company, was established in 2018. Their midsize team is located in Berkeley, California. Their services include back office outsourcing, customer service outsourcing, sales outsourcing, call center services, and more.
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27Undisclosed10 - 49 employeesSpokane, WARead More
Sound Telecom is an answering services provider based in Spokane, Wash., with a team of 25. Founded in 1986, the team provides voice and transcription services for clients in a variety of industry.
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BoeingIndustries
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28$1,000+50 - 249 employeesLondon, EnglandHeadquartered in Dover, Delaware; London, England and Kyiv, Ukraine, SalesAR is a midsize Sales Outsourcing company. Established in 2019, the team specializes in Sales Outsourcing, Content Marketing, Email Marketing, Call Center Services, and more.Read More
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AkridataIndustries
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29$1,000+250 - 999 employeesBrooklyn, NYCustomer Service Outsourcing company Top Customer Service is headquartered in Brooklyn, New York; London, England; Melbourne, Australia and Dubai, United Arab Emirates. The company provides Customer Service Outsourcing, Data Annotation Services, Back Office Outsourcing, Call Center Services, and more and is midsize.The company was launched in 2010.Read More
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Wyze Shippo Duolingo ZocdocIndustries
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30$1,000+50 - 249 employeesScottsdale, AZRead More
Intelemark is an appointment setting and B2B lead generation company based in Scottsdale, Ariz. The company, founded in 1999, has more than 25 employees who provide voice and other marketing services to various companies.
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Dow JonesIndustries
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