Short Monitor — Aluguel & Posição Vendida

Who is short what, at what cost, on B3's public securities-lending book. Every figure comes from B3's own daily lending files: the open position per ticker, and the annualized rates lenders received and borrowers paid.

This series cannot be backfilled. B3 keeps roughly 21 business days of lending data and publishes no archive, so the history below starts when SILO began capturing it and grows one session per day. A gap here is permanent, not late — which is the opposite of every CVM page on this dashboard.

Read % do free float with its basis. B3 publishes a true free float only for index constituents; everything else falls back to shares outstanding, a larger denominator and so a smaller percentage. The ranking below is free-float-only, so its rows are comparable. The split is charted at the foot of the page.

Maiores Posições Short — % do Free Float

Short interest as a share of the free float B3 publishes for index constituents. These are the positions that are large relative to the shares actually available to buy back.

Equities and units only. Index ETFs carry large loan balances against their own quota count for creation/redemption reasons that have nothing to do with a directional view.

Maior SIR — Days to Cover

Short Interest Ratio: how many sessions of average volume it would take to buy the position back, against the trailing 21-session ADTV. A high ratio is a crowded exit, not merely a large position.

Positions under R$5mn are excluded — a small short on an illiquid name produces an enormous and meaningless ratio. Sessões is how many sessions the ADTV average actually covers; fewer than 21 means a shorter, noisier window.

Maiores Taxas de Aluguel

The annualized rate borrowers paid, quantity-weighted across B3's lending markets for the session. Expensive borrow is the market pricing scarcity — it usually moves before the position does.

Markets with no registered quantity publish a nominal rate on no business and are excluded, which is what keeps a dormant BDR off the top of this table.

Posições Short por Setor

The equity short book aggregated by B3's own top-level sector. Only SHARES and UNIT are counted: ETFs and BDRs carry no B3 sector, and including them would make an unclassified bucket the largest bar on a chart about single-name risk.

Evolução do Short Book

Total short balance per session over the window SILO holds. A short line here means recent coverage, not a quiet market.

Qual Denominador — Free Float ou Capital Social

How much of the short book can be stated as a percentage of true free float at all.

• index_free_float — what the ranking table uses.
• shares_outstanding — real positions against a larger denominator, so not comparable to the ranking above.
• sem denominador — B3 published neither figure; % float is NULL, not zero.