Fails to Deliver and the Buy-In Process
When a seller doesn't deliver shares by settlement date, the trade doesn't just cancel — it becomes a fail, and if it isn't resolved the buyer's broker can force the issue by buying the shares in the open market at the seller's expense.
Prerequisites: Settlement Cycles, Fails And Buy-Ins
Every stock trade has a settlement date — in the U.S., one business day after the trade — by which the seller must actually deliver the shares and the buyer must pay for them. Most of the time this happens automatically through the clearinghouse without anyone thinking about it. But sometimes the seller doesn't have the shares ready to deliver, often because they sold short and couldn't borrow the stock in time, or because of an operational mix-up. When settlement date arrives and delivery hasn't happened, the trade becomes a fail to deliver (FTD).
What happens during a fail
A fail doesn't cancel the trade. The buyer has still paid (or is obligated to), and the trade sits open, unsettled, until the seller manages to deliver the shares. For a few days this is usually just an operational nuisance, tracked and cleared up as brokers and clearinghouses locate the stock. But regulators worry about fails that drag on, because a large, persistent fail can function like an uncovered short sale that never actually borrowed anything — the seller has, in effect, sold shares that don't exist yet, without the market noticing.
The buy-in
If a fail isn't resolved within a set window (in the U.S., generally by the start of trading a few days after settlement date for most equities, with even tighter rules for certain "threshold list" stocks that persistently fail), the buyer's broker gains the right — and under some rules, the obligation — to execute a buy-in: buying the shares outright in the open market and charging the cost back to the delinquent seller's broker, regardless of what price the stock has moved to since the original trade. This forces the fail closed one way or another.
A concrete example: a trader sells 10,000 shares short but the stock is unexpectedly hard to borrow, and the shares aren't delivered by settlement date. If the fail persists past the regulatory buy-in deadline, the buyer's broker purchases 10,000 shares in the market — potentially at a much higher price than where the short was originally sold, if the stock has since rallied — and bills that cost to the seller's broker, who passes it on to the short seller. The short seller's loss is no longer just "the stock went up"; it's locked in at whatever price the buy-in executed.
What this means in practice
Persistent fails and buy-in pressure are one of the mechanisms behind a short squeeze: if a stock is hard to borrow and fails are piling up, a wave of buy-ins can force real buying volume into the market at exactly the moment the stock is already under short-covering pressure, amplifying the move. Traders shorting a hard-to-borrow name need to track fail and buy-in risk as a real cost, separate from the ordinary stock borrow fee.
A fail to deliver leaves a trade unsettled rather than cancelled, and if it isn't cleared up within the regulatory window, the buyer's broker can force a buy-in — purchasing the shares in the market at the current price and charging the seller, which can turn an ordinary hard-to-borrow short into a locked-in loss.
It's easy to assume a fail is purely a paperwork issue that resolves itself. In hard-to-borrow names, persistent fails and buy-ins are a real, sometimes sharp financial risk — the buy-in executes at whatever the market price happens to be that day, not at any price favorable to the seller.
Related concepts
Practice in interviews
Further reading
- SEC, Regulation SHO