American Best IT Limited (Dhaka, Bangladesh)

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Positions itself as a "B2B-B2C Lead Generation Expert/Service Provider" in Dhaka. They offer customized solutions using data-driven strategies and digital tools, including web development, social media marketing, and email campaigns.
Net Bangla Limited (Dhaka, Bangladesh): Offers B2B & B2C Lead Generation services, including web research and email list building, alongside other digital marketing and contact center solutions.

Leadgenbd (Kushtiya, Bangladesh): An armenia cell phone number data online-based lead generation company focusing on B2B lead generation.
Ecomclips (Bangladesh): Offers "B2B, B2C multi-channel lead generation services" including social media, email, and content marketing.
Truelancer / Upwork / Guru (Freelance Platforms - Bangladesh): These platforms host many individual freelancers and small agencies in Bangladesh who specialize in lead generation (B2B and B2C), data entry, web research, and email list building. You can find local experts here, like "Md Mofazzal Hossain" or "Al Amin Sarker" who explicitly mention B2B and B2C lead generation.
III. White Label Lead Generation Companies
These companies perform the lead generation work but allow you to brand the leads and services as your own. This is ideal if you want to expand your service offerings or scale quickly.

Many of the specialized solar lead gen companies (like SunLead with its white-labelled quotation tool, or solarVis with its lead generator) offer white-label solutions.
Some general lead generation agencies may also offer white-label partnerships.