OpenServed

Best Marketing Lead Generation Agencies (2026) – Ranked by Case Studies

BelkinsVisit Website →
Mole Street Client-verified
Lead Generation
Marketing
11-50 Employees
N/A
Philadelphia, PA
N/A
  • 89 appointments booked in the first year
  • 56% cold email open rate
Maark Client-verified
Lead Generation
Marketing
51-200 Employees
N/A
Boston, MA
N/A
  • $1.5M biggest deal in pipeline
  • 25 appointments booked in 3 months
X3 Marketing Group Client-verified
Lead Generation
Marketing
1-10 Employees
N/A
Northglenn, CO
N/A
  • 115 appointments booked in 14 months
  • 20 deals closed
SoproVisit Website →
Write Arm Client-verified
Lead Generation, Email Marketing
Marketing
11-50 Employees
N/A
Brighton, United Kingdom
N/A
  • 1,500+ leads generated through Sopro campaigns
  • Cost per lead of £42 with a 4.3% lead rate
CopyHouse Client-verified
Lead Generation, Email Marketing
Marketing
11-50 Employees
N/A
Edinburgh, United Kingdom
N/A
  • First deal closed within two months, covering Sopro's service costs
Getting the Market
Lead Generation, Email Marketing
Marketing
11-50 Employees
N/A
Rotterdam, Netherlands
N/A
  • 6X ROI
  • 218+ leads secured
  • Cost per lead of approximately €80
Social BloomVisit Website →
Advertise Purple Client-verified
Lead Generation, Email Marketing
Marketing
51-200 Employees
N/A
Santa Monica, CA
N/A
  • $1.5M in pipeline value generated in 90 days
  • 50+ SQLs generated
  • 3 outbound campaign verticals (TikTok Shop, Amazon, affiliate)
Space Bar Studios Client-verified
Lead Generation, Email Marketing
Marketing
11-50 Employees
N/A
New York, NY
N/A
  • $800K in pipeline value generated in 3 months
  • 78 SQLs generated
  • 160 positive responses
Grow Solo Media
Lead Generation, Email Marketing
Marketing
N/A
N/A
N/A
N/A
  • $113K in new pipeline within 20 days
  • 3.8% positive reply rate
  • 40% average open rate
Outbound SystemVisit Website →
FireVibe Web Design Client-verified
Lead Generation, Email Marketing
Marketing
1-10 Employees
N/A
Hagerstown, MD
N/A
  • 15 meetings booked in 1 month
  • 2 deals closed in 1 month
Wojo Media
Lead Generation
Marketing
11-50 Employees
N/A
Walden, NY
N/A
  • 31 meetings booked in 30 days with managed LinkedIn outreach
  • 165 replies across three LinkedIn campaigns
Lead Marvels
Lead Generation, Email Marketing
Marketing
11-50 Employees
N/A
Fishkill, NY
N/A
  • 120+ qualified leads in 12 months
  • $786K qualified pipeline built through cold email
  • 350+ Microsoft inboxes across 9 domains for consistent inbox placement
Sapper Consulting LLCVisit Website →
(un)Common Logic Client-verified
Lead Generation, Email Marketing
Marketing
11-50 Employees
N/A
Austin, TX
N/A
  • $16K revenue generated
  • 91 lifetime meetings booked
  • 23% lifetime ROI
Square360
Lead Generation, Email Marketing
Marketing
N/A
N/A
N/A
N/A
  • 200% ROI in the first year
  • First new client in 3+ years signed within 3 months
  • 2 additional clients signed in the first year
INSIDEAVisit Website →
AdLib Media Group Client-verified
Lead Generation
Marketing
1-10 Employees
N/A
New York, NY
N/A
  • 370% Deal creation growth
  • 73 Deals in a single week
  • 85.43% Pipeline in active deals
  • Reduced avg ticket resolution time
Acceleration PartnersVisit Website →
CouponFollow (AP Brand Newsletter) Client-verified
Email Marketing, Lead Generation
Marketing
51-200 Employees
N/A
New York, NY
N/A
  • 30K+ newsletter recipients with a 56% open rate
  • +37% average revenue increase for participating brands
  • +13% average clicks and +10% average transactions for brands
SalesARVisit Website →
ZoomMedia
Lead Generation
Marketing
11-50 Employees
N/A
London, United Kingdom
N/A
  • 5,000 contacts researched
  • 11 appointments scheduled
  • 3% reply rate
Tier 11
Lead Generation
Marketing
11-50 Employees
N/A
Sagamore Beach, MA
N/A
  • 6,000 contacts researched
  • 34 appointments scheduled
  • 10% close rate
SCORR Marketing
Lead Generation
Marketing
51-200 Employees
N/A
Kearney, NE
N/A
  • 4,500 contacts researched
  • 38 appointments scheduled
  • 10x average ROI
Nexus Marketing AgencyVisit Website →
Getting Attention
Lead Generation
Marketing
51-200 Employees
N/A
N/A
N/A
  • 49% projected year-over-year revenue growth
  • 29% increase in average closed-won deal size
Getting Attention
Lead Generation, Content Marketing
Marketing
51-200 Employees
N/A
N/A
N/A
  • 5x top-of-funnel pipeline growth after webinars
  • 166 average registrants per webinar at a 37% attendance rate
  • 20 typical qualified deals started from webinar touchpoints
Innovation VisualVisit Website →
Hollywood Branded
Lead Generation
Marketing
11-50 Employees
N/A
Los Angeles, CA
N/A
  • Pitch decks generated 98% faster, in under 3 minutes versus 60-120
  • Doubled sales velocity
  • Data enrichment in 20 seconds
MarketJoy, Inc.Visit Website →
Viachem
Lead Generation, Email Marketing
Marketing
N/A
N/A
Plano, TX
N/A
  • 91 targeted leads in 10 weeks
  • Pipeline filled for an entire year
MultiViewVisit Website →
Response Solutions
Lead Generation, Social Media Ads
Marketing
N/A
N/A
N/A
N/A
  • 42M+ impressions delivered for higher education clients
  • Hundreds of client campaigns since 2022