What is STBT (Sell Today Buy Tomorrow)? A Simple Guide

Quick Answer

STBT means selling a stock or contract today and buying it back the next day, aiming to profit from an expected fall. It is the mirror of BTST. In the cash market, short selling cannot be carried overnight, so STBT is generally done through derivatives rather than shares.

STBT is the bearish twin of BTST: you sell first and buy back tomorrow, hoping the price drops overnight. But there is an important catch in how it can be done.

This guide explains how STBT works, why it usually needs derivatives, and the risks of holding a short overnight.

Key Takeaways

• STBT means selling today and buying back the next day.
• It aims to profit from an overnight fall.
• It is the mirror image of BTST.
• Cash-market shorts cannot be held overnight, so derivatives are used.
• An overnight gap up is the main risk.

How does STBT work?

The trader sells first, expecting the price to fall by the next day, then buys back to close and pocket the difference. The profit comes from selling high and buying back lower. It is used when a trader expects weakness to carry into the next session.

Why does STBT usually need derivatives?

In the cash market, you cannot short-sell shares you do not own and carry that short overnight; intraday shorts must be closed the same day. To hold a short position into the next day, traders use futures or options, where short positions can be carried. So STBT in practice is mostly a derivatives strategy.

What is the main risk?

A gap up at the next open. Because you are short overnight, good news after the close can open the price sharply higher, forcing you to buy back at a loss with no chance to act until the market reopens. Short positions also carry open-ended risk if the price keeps rising.

Who should consider STBT?

It suits experienced traders comfortable with derivatives and short-selling risk. The overnight gap and the open-ended nature of a short make it unsuitable for beginners. Anyone using it should understand futures and options and manage the position with strict stops.

Why is STBT more complex than BTST?

STBT means selling first and buying back later, which requires holding a short position overnight. In many cash markets, short selling cannot be carried across days, so STBT is usually done through derivatives such as futures. This makes it more complex and typically unsuitable for beginners, since derivatives carry leverage and their own risks. The need to short through derivatives, combined with overnight exposure, is what makes STBT a more advanced strategy than its counterpart BTST.

What risks does an overnight short carry?

An overnight short position is exposed to the danger of a sharp upward gap at the next open, which is especially painful because losses on a short position can grow as the price rises. Positive news after the close can force a much higher opening, beyond where a stop would have protected. Because of this asymmetric risk and the leverage involved when using derivatives, STBT demands careful sizing, a clear plan, and experience, making it best avoided by those new to the markets.

Trading and intraday strategies carry a high risk of loss and are not suitable for every investor. This article is educational and is not a recommendation to trade.

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