What is a Buy-to-Cover Order? Definition, Formula, and Example
A buy-to-cover order is a buy order used to close an existing short position by repurchasing the borrowed shares.
What is a buy-to-cover order?
A buy-to-cover order is a market or limit order to buy shares specifically to close out an open short position. When a trader sells short, they borrow shares and sell them into the market, creating a negative share balance in their account. To exit the trade, they must buy back an equal number of shares and return them to the lender. That repurchase transaction is executed as a buy-to-cover order. Once filled, the short position is flat and the borrow obligation ends.
How it works
A short sale begins with a locate and borrow of shares, followed by a sell order. The account then holds a negative position in the security plus cash proceeds from the sale, minus any borrow fees and collateral requirements. A buy-to-cover order reverses the sale side of the trade:
Shares to cover = Shares originally sold short
Profit or loss per share = Sale price per share - Cover price per share - Borrow fees
If the cover price is lower than the sale price, the trade is profitable. If the cover price is higher, the trader realizes a loss. Unlike a standard buy order that increases long exposure, a buy-to-cover order reduces a negative position. It can be submitted as a market order for immediate execution or as a limit order to cap the maximum repurchase price.
Worked example
A trader sells short 1,000 shares of XYZ at $50.00 per share, receiving $50,000 in proceeds (ignoring commissions and borrow fees for simplicity). The account now shows -1,000 shares of XYZ. Two weeks later, XYZ trades at $45.00. The trader submits a buy-to-cover limit order at $45.10, which fills. The account buys 1,000 shares for $45,100 and returns them to the lender.
Gross profit = ($50.00 - $45.10) × 1,000 = $4,900.
If instead XYZ had rallied to $55.00 and the trader covered at $54.90 to limit further losses, the loss would be ($54.90 - $50.00) × 1,000 = -$4,900 plus borrow fees.
When traders use it
Traders use buy-to-cover orders to close short positions for three reasons: to lock in profits after a price decline, to cut losses after an adverse price move, or to satisfy a margin call or buy-in notice from their broker. Short sellers also cover ahead of earnings announcements or ex-dividend dates to avoid dividend payment obligations on borrowed shares. Day traders may cover intraday, while swing or position traders may hold shorts for weeks.
Covering can be done in full or in partial lots. Partial covers reduce position size while maintaining some short exposure. In illiquid stocks, large buy-to-cover orders can move the price against the remaining short position, a dynamic known as covering pressure.
Buy-to-cover orders can be placed directly in the trade ticket on the [paper trading simulator.]
Limitations and common misconceptions
A buy-to-cover order does not guarantee a specific exit price. A market buy-to-cover in a fast-moving or illiquid stock can fill well above the last quoted price, especially during a short squeeze when buying pressure overwhelms available sell offers. Traders sometimes confuse covering with closing a long position; selling shares you own is not a buy-to-cover, and buying shares to add to a long position is also not a cover.
Short sellers must also account for borrow fees, which accrue daily and reduce net profit. A stock can become hard-to-borrow, making new shorts difficult, but covering an existing short remains possible as long as shares are available in the market. Finally, covering a short does not eliminate the risk of a subsequent price drop; the trader simply no longer participates in it.