This revelation comes despite several events pledging five years ago to attain a "50/50" gender balance throughout line-ups by this year.
A YouGov survey was used by the BBC to compile a list of 50 of the UK's biggest and most favourable events.
Out of the 200 headliners across all festivals, it found that 26 (13%) were an all-female band or a solo artist; 149 (74.5%) were either an all-male band or a solo artist; 24 (12%) had a mixed line-up of male and female performers, and one (0.05%) artist identified as non-binary.
Speaking to BBC Newsbeat, musician Maggie Rogers said: "What I come to music for - as a fan and artist - is community and to feel part of something, and I think community functions at its best when it feels inclusive.
"When that doesn't happen - when the line-ups reiterate imbalances that exist in gender and race and class - it's not surprising, but it's certainly not ideal."
This research shows little change since last year's research by The Guardian which found that out of 31 festivals, a majority were heavily weighted towards male performers.
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Two programmes were started in 2017 with the goal of increasing the number of female and gender-identifying artists on stage. Following a previous BBC survey, Festival Republic's ReBalance and PRS' KeyChange showed that almost 80% of headliners were all men.
Read the full BBC analysis here.
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Aneesa Ahmed is Mixmag's Digital Intern, follow her on Twitter