Gerasim Tsonev

Founder, Trading Toolbox

Gerasim Tsonev founded Trading Toolbox and co-founded AutoTax (autotax.bg), which turns broker statements into a Bulgarian tax return. A graduate of the Mathematics High School in Varna and of computer science at the University of Southampton, he builds the weekly checks behind every grade on this site and tests each rule on ten years of S&P 500 data before it is used. What did not survive the test is published too.

Articles

• The S&P 500: what our 10-year tests found
• Debt, cash and price: three checks before you buy a stock
• Long-term investing: when to hold and when to sell
• Fair value of a stock: how we calculate it and when not to trust it
• What to invest in (2026): what the data says
• ETFs on Revolut: how to find VWCE, SXR8 or CSPX, and what it costs
• Does copying Pelosi's and Congress's stock trades work? We tested it
• Buffett vs the S&P 500: what Berkshire's own letters show, decade by decade
• High dividends and covered calls: safe passive income? We tested it
• Trading 212 fees: ETFs, currency exchange and deposits
• Interactive Brokers fees for ETFs in Europe
• eToro fees for ETFs: currency exchange and the CFD catch

Course

Free course "Investing without illusions" (Bulgarian): 13 short lessons.

Elsewhere

LinkedIn · AutoTax · Trading Toolbox