Calculate the effective tradeable float after a reverse split — the single most important number for sizing any RS trade. Five inputs, all from public SEC filings. Built directly from the Tier 1 Float Analysis Framework.
Source: 10-K or 10-Q cover page → 'Indicate the number of shares outstanding.' Also visible on SEC EDGAR filing header.
Source: 8-K Item 5.03 or DEF 14A. Enter the divisor — for a 1:20 split, type 20.
Source: SEC Form 4 + proxy statement ownership table. Sum directors + officers + >10% shareholders. Enter the PRE-SPLIT number.
Source: 13F filings (institutional ownership). Use conservatively — not every institutional share is locked. Enter the PRE-SPLIT number.
Source: 10-K notes, S-1, S-3. Shares that could enter the float via DRIP enrollment, warrant exercise, or option vesting. Enter the PRE-SPLIT number.
A reverse split doesn't change market cap — it changes the number of shares circulating in public hands. When that number is tiny, the same volume of buying pressure produces wildly different price action than it would in a high-float stock. Shorts may struggle to borrow shares. Algos detect the squeeze setup. Retail chases.
Reading float correctly is the difference between sizing the trade properly and getting steamrolled. Every Tier 1 student does this calculation by hand at least once — this tool just speeds it up.