Short selling stocks. Bearish exposure honestly.

Short selling is the way to profit when a stock declines. The mechanics are simple. The risks are not. The trader borrows shares from the broker, sells them at the current price, and buys them back later (hopefully at a lower price) to return to the lender. The difference is the profit, minus the borrow fee.

Done with discipline, short selling adds the bearish side to a complete trading approach. Done without discipline, short selling produces account ending losses faster than almost any other strategy because the loss is theoretically unlimited.

The mechanics

The broker maintains an inventory of shares available to lend (the "easy to borrow" list). When the trader places a short sell order, the broker locates shares from this inventory, lends them to the trader, and executes the sale at the current market price.

The cash from the sale goes into the trader's account but is held as collateral. The trader cannot withdraw it because the short position is still open.

The trader pays a daily borrow fee for the duration of the position. Easy to borrow stocks have low borrow fees (often less than 1 percent annualized). Hard to borrow stocks (low float, heavily shorted) can have borrow fees of 10 to 100 percent annualized, sometimes more.

To close the position, the trader buys back the shares at the current market price and returns them to the lender. The profit or loss is the original sell price minus the buy back price, minus the cumulative borrow fees, minus commissions.

The maximum loss problem

The fundamental risk of short selling is that the maximum loss is theoretically unlimited. A long stock position can only go to zero. A short position has no upper bound because the stock can rise to any price.

A short at $50 has $50 of potential profit (stock goes to zero). The same short has unlimited potential loss. If the stock goes to $100, the loss is $50 (100 percent of original capital). If the stock goes to $200, the loss is $150 (300 percent of original capital).

This asymmetry is why short selling requires more rigorous risk management than long positions. The stop has to be honored mechanically. The position size has to account for the higher tail risk.

The short squeeze

A short squeeze happens when a heavily shorted stock starts rising and short sellers rush to cover their positions. The covering produces buying pressure that drives the price further up, which triggers more covering.

GameStop in January 2021 is the most famous example. The stock went from $20 to $480 in two weeks. Short sellers at $20 (or earlier) faced losses of 20x to 30x their original capital. Many funds were forced to close at catastrophic losses.

Other examples include AMC, Bed Bath and Beyond, the Volkswagen squeeze in 2008 (Porsche cornered the float), and countless smaller squeezes throughout market history.

The setup for squeezes is high short interest as a percentage of float (often 30 percent or more) combined with a catalyst that triggers buying. The catalyst can be a news event, a coordinated retail push, or simply a technical breakout that triggers algorithmic buying.

How to identify squeeze risk

Short interest as a percentage of float. Above 20 percent is elevated. Above 40 percent is dangerous. Above 100 percent (yes, this is possible due to repeated lending) is squeeze territory.

Days to cover. The short interest divided by average daily volume. A days to cover above 5 means it would take more than five days of normal volume for all shorts to cover, which means covering pressure can drive significant moves.

Cost to borrow. Hard to borrow status (CTB above 10 percent annualized) signals that the broker inventory is low and the squeeze risk is elevated.

Float size. Small float stocks (under 50 million shares) move more on the same dollar volume because there is less supply. Squeezes on small float stocks are more violent.

Check these metrics on free sources (Fintel, ChartExchange, Ortex for paid) before shorting any individual stock. The metrics change weekly.

The alternatives to short selling

Long puts.

Buy a put option instead of shorting the stock. The maximum loss is the premium paid. The position profits if the stock falls below the strike minus the premium.

Long puts give defined risk bearish exposure without the borrow fee, the squeeze risk, or the unlimited loss profile. The trade off is time decay (theta) on the put.

For most retail bearish trades, long puts are the better instrument than direct short selling.

Bear call spreads.

Sell a call near the money and buy a call further out of the money. The position collects premium and profits if the stock stays below the short call strike. Maximum loss is the spread width minus the credit collected.

Defined risk bearish position. Works when IV rank is high. Combines income with bearish bias.

Inverse ETFs.

ETFs that move inversely to the underlying index. SQQQ moves 3x the inverse of QQQ. SOXS moves 3x the inverse of the semiconductor index. SH moves 1x the inverse of SPY.

Defined risk (capped at the ETF price). No borrow fee. Available in any standard account without margin or options approval. The tradeoff is decay over time due to the daily rebalancing of leveraged ETFs.

For multi day or multi week bearish exposure on indexes, inverse ETFs work cleanly. For long term holds, the decay erodes the position.

Bear put spreads.

Buy a put and sell a further out of the money put. Defined risk debit spread that profits from a moderate decline. Cheaper than the long put alone but caps the upside.

The setup rules for short selling

If the trader insists on direct short selling rather than the alternatives, the rules below cut the risk to manageable levels.

Only short stocks in confirmed daily downtrends. Higher highs and higher lows have to be broken on the daily chart. Shorting an uptrend is fighting the flow.

Avoid short interest above 20 percent of float. The squeeze risk is too high regardless of how bearish the chart looks.

Use hard stops at the broker, not mental stops. The short can move against you overnight by gaps that would not have stopped a long position.

Size down compared to long positions. The tail risk is higher. Half the normal position size on short sales accounts for the larger expected range.

Avoid shorting names with recent IPO, recent strategic announcements, recent activist involvement. These produce squeeze catalysts that can blow up technically valid short setups.

Cover before earnings unless you have a specific earnings short thesis. The post earnings move can be violently against the short on any positive surprise.

The regulatory side

SEC Rule 201 (the alternative uptick rule) restricts short selling on stocks that have dropped 10 percent or more from the prior close. Short sales can only execute at a price above the highest current bid. This slows the decline but does not prevent it.

Regulation SHO requires brokers to locate shares before allowing short sales. The broker has to confirm shares are available to borrow. Failure to locate produces a "fail to deliver" which the regulators monitor.

The SEC and FINRA can halt short selling on specific stocks during extreme moves. The 2008 financial crisis included a temporary short selling ban on financial stocks.

Where the audit fits

The audit reads the actual short sale entries and shows whether the trader is following the discipline rules or taking marginal shorts in heavily shorted names. For most retail short sellers the pattern is shorting recent momentum names that produce squeezes. The plan locks the rule set including the alternatives (long puts, bear call spreads, inverse ETFs) where they fit better than direct shorts. Five to seven pages.