Live Webinar Data and Analytics Consultancies: Valuations and M&A in 2026 Thu, Oct 1 11am ET / 5pm CET Register
Marcin Majewski, founder of Aventis Advisors, in a navy blazer and white shirt, standing outdoors by a bridge.

Marcin Majewski

Founder, Managing Partner
Technology M&A

Marcin founded Aventis Advisors and has spent more than 20 years advising founders and investors on M&A and corporate finance across software, IT services, testing and certification, business services and manufacturing.

Based in Warsaw Covers Software, IT Services, TIC, Business Services, Manufacturing

About Marcin

Marcin works on sell-side and buy-side mandates for founders and private equity investors, in software, IT services, testing, inspection and certification, business services and manufacturing.

He publishes the firm’s valuation research, including the SaaS and IT services multiples series and the buyer landscape studies that map who acquires in each subsector, and speaks regularly on valuation and exit timing.

The deals worth doing leave both sides better off. My job is to get the owner to the right buyer at the right moment, with a clear view of what the business is worth.

Selected transactions

21 closed deals

Aventis has extensive experience across buy-side and sell-side

TargetAcquirorSector
De Duurzame Adviseurs DDA acquired by Apave Apave Testing, Inspection and Certification
MD Consulting acquired by Spyrosoft Spyrosoft IT Services
ISOCERT acquired by Apave Apave Testing, Inspection and Certification
Nefeni acquired by Symfonia Symfonia Software
BI Convert acquired by TSG Group TSG Group Business Services
EIP Dynamics acquired by Digital Mind Digital Mind IT Services

Webinars and speaking

14 sessions

Insights by Marcin

56 articles

Considering a sale or raise?

Tell me what the company does, roughly where revenue and profitability sit, and what you are weighing up. With that much I can usually give you a useful answer in my first reply. First conversations are confidential.

Talk to Marcin

Schedule a complimentary, non-obligatory consultation