The portfolio
Harley Twins owns 1 paid Skool group indexed in the public Skool directory. Combined estimated MRR: $441.5K. Total paying members across the portfolio: 446.
Flagship
"The Spartan Protocol" is the biggest piece, generating roughly $441.5K/mo from 446 paying members. It sits in the fitness & training niche.
See The Spartan Protocol on tools4skool →Outperforming the niche
Average MRR among the top 0 fitness & training Skool communities is $0. The Spartan Protocol is doing Infinity% of that average — well ahead of the pack.
Why it matters
Multi-community operators like Harley Twins are the quiet whales of Skool — most attention goes to the single-community stars, but portfolio builders compound faster. The 14-day Skool affiliate cookie means anyone who clicks through tools4skool.com can become part of the next owner's growth.