Backspread

A backspread is an options position where a trader sells one or a few options at one strike price and buys a larger number of options at another strike, using the same expiration date and the same type of option (either all calls or all puts). Because more contracts are bought than sold, the position is "long" more options than it is "short," which changes how it behaves compared to a simple bought or sold spread.

The reason traders build a backspread this way is to create a position that gains from a big move in one direction while limiting the cost or even collecting a small credit up front. The short option (the one sold) helps pay for the long options (the ones bought), and because there are more long contracts than short ones, a sharp move in the right direction can produce gains that grow faster than the losses on the smaller short side. If the underlying price barely moves, the position often loses a small, limited amount, since the extra long options lose value from time decay while the single short option doesn't fully offset that.

The nuance that trips people up is the shape of the risk. A backspread is not "safer" just because it involves buying more options than selling; the risk profile depends heavily on the strikes chosen and the ratio of bought to sold contracts. Near the strikes, especially if the underlying stays flat or drifts slightly, the position can still lose money, sometimes its maximum loss, even though more options were purchased than sold. The strategy is really a bet on volatility or a directional move being large, not a bet that "buying more equals winning more."

Backspreads are a form of ratio spread, just skewed so the long side outnumbers the short side (the opposite ratio spread, where you sell more than you buy, is sometimes called a "front spread" or simply a ratio spread).