Best Lead Generation Agencies in 2026

Belkins is a Denver appointment-setting agency of 51 to 200 people that runs cold email, calling, LinkedIn, ABM and outsourced SDR support as one programme, with HubSpot CRM consulting available. It has the deepest review base here, 234 Clutch reviews averaging 4.9, and owns its deliverability tools. Named clients include Ordway, HiBob, Autodesk and NVIDIA. Its site gives a $5,000 starter package for finance clients, and Clutch lists an hourly rate under $25.

Powered by Search began in Toronto in 2009 as an SEO shop and has since narrowed into a B2B SaaS marketing agency. It combines SEO, GEO, paid search, ABM, demand generation and HubSpot RevOps, with content and demand work integrated rather than siloed. Clients include Elastic, SentinelOne and Varonis, and it has a 4.8 rating and a $10,000 minimum.

UltraGrowthMedia generates B2B pipeline from cold email, LinkedIn outreach and in-house lead research, with SEO, content and GEO available when you want inbound demand as well. Each programme starts with ICP definition, verified lead lists and properly set-up sending domains. The agency says it typically targets 10 to 20 qualified meetings a month from email and 15 or more from LinkedIn, and one client reports a 60% drop in cost per lead within 90 days. Founded in 2022 by Tushar Dey, the 27-person remote team works in weekly sprints, clients talk directly to the practitioners doing the work, and progress shows up on live reporting dashboards. Retainers start at $3,500 a month.

Salesar is a Dover, Delaware outbound agency of 51 to 200 people covering appointment setting, cold email, LinkedIn outreach, ABM and prospect research, with sending infrastructure and deliverability support included. It holds 4.9 from 136 Clutch reviews, with Premier Verified status, and runs weekly reviews with a live dashboard. Case studies publish contacts, replies and appointments. Clutch lists a $1,000+ minimum and hourly rates under $25.

Martal Group is an Oakville, Canada outsourced sales firm of 201 to 500 people, founded in 2009, that runs cold calling, email and LinkedIn as one sequence with dedicated SDR teams. It holds 4.8 from 109 Clutch reviews, where reviewers say it favours lead fit over volume, and lists manufacturing, medical and logistics among its sectors. Clutch lists a $1,000+ minimum and $25 to $49 an hour, with offices in Canada and the US.

Leadium is a Las Vegas agency of 51 to 200 people, founded in 2016, that provides a done-for-you SDR team running email, phone, LinkedIn and sales gifting, with data and deliverability handled in the same engagement. It holds a 5.0 rating from 90 Clutch reviews that cite close founder involvement. Named clients include Segment, People.ai and Veem. Clutch lists a $1,000+ minimum and hourly rates under $25.

SevenAtoms is a Dublin, California paid search and demand generation shop, dated to 2013 by independent records. It runs Google Ads, Facebook Ads and LinkedIn marketing with landing page design built into campaigns. It has B2B tech case studies for clients such as Bloom Energy, Imperva and BigPanda, and it is comfortable in regulated verticals such as medical and cybersecurity. Its minimum is $4,000 a month.

Gripped is a London B2B SaaS growth agency, set up in 2017 by two marketers from B2B software companies and still founder-led. It covers demand generation, lead generation, ABM, paid search, paid social, LinkedIn Ads and SEO, and it knows cybersecurity, fintech, HR tech and dev tools. LinkedIn depth matters more than generic paid social in B2B. Its minimum is $7,500 a month, with a 4.8 rating.

SeeResponse is a McLean, Virginia B2B growth agency founded in 2019. Its services span demand generation, ABM, outbound and email marketing, content, SEO and HubSpot marketing operations, with go-to-market strategy up front. It says it has worked with more than 120 B2B companies, mostly mid-market SaaS and tech, and clients deal directly with a founder. It starts at $2,500 a month and holds a 4.7 rating.

A-Sales is a Stockholm agency of 51 to 200 people, founded in 2023, with a large in-house calling team plus cold email and LinkedIn, and a pay-per-appointment option. Clutch reviewers cite 26 working languages, and the site offers GDPR, SOC 2 and ISO 27001 documentation on request. It holds 4.9 from 84 Clutch reviews and names Gartner, Jotform and HCL Software. Clutch lists a $1,000 minimum and $200 to $300 an hour.

DMT Business Development is an Ottawa outbound agency of 51 to 200 people, formerly SalesNash, that books B2B meetings by calling, email and LinkedIn, with data research and deliverability support. It holds 5.0 from 80 Clutch reviews and publishes case studies with monthly appointment counts for clients such as Yodeck and Productive. Clutch lists a $1,000+ minimum and $25 to $49 an hour, which is modest against many peers.

WebFX is a Harrisburg, Pennsylvania agency with more than 750 staff and nearly 30 years in business, founded in 1996. Lead generation sits next to search and AI visibility, digital PR and content, and its RevenueCloudFX platform links marketing to CRM data. It has deep experience in regulated industries such as healthcare and legal. Minimums start at $2,500 a month, with a 4.9 rating.

farsiight is a Brisbane paid media agency, dated to 2017, that runs Google, Microsoft, Facebook, Instagram and LinkedIn ads and demand generation for ecommerce and B2B SaaS clients. It holds 80 Clutch reviews at a 5.0 average, names Simpro, Go1 and AroFlo, and makes performance creative in house. It publishes original research, including a 2026 report on Australian B2B paid media.

Callbox is a Los Angeles lead generation firm with more than 1,000 staff, founded in 2004, that combines appointment setting, outsourced SDRs, ABM and email, calling and LinkedIn outreach. It offers multilingual outreach across Asia-Pacific, Europe and Latin America, and holds 128 Clutch reviews at 4.6 with Premier Verified status. Its Logistics case study reports 146 appointments in 12 months, per Callbox. Clutch summarises typical cost as $12,000 to $80,000 a year.

Add People is an Altrincham, Greater Manchester agency founded in 2002, with more than 250 staff and a US base in Austin. Its lead generation PPC sits alongside SEO, local SEO, digital PR, Amazon advertising and productised offers for small businesses. It is a Google Premier Partner, was ranked 12th in Prolific North's Top 150 Agencies 2026, and cites a very large Trustpilot review base.