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Congressional Research Service
Informing the legislative debate since 1914


Updated  August 8, 2023


Short Selling: Background and Policy Issues


Short selling generally involves the sale of a stock that the
seller does not own (and instead borrows and must return at
a later date) with an intent to profit if the stock declines in
value. The practice has generated policy attention because
of its risks and potential association with market
manipulation. This In Focus discusses the mechanics and
regulation of short selling along with associated policy
issues.

Short-Selling Operations
Short selling generally refers to the sale of a security that
the seller does not own or does not deliver. A short-selling
transaction often initiates with the short seller borrowing a
security from a broker-dealer or an institutional investor
and selling the borrowed security in the open market. The
short seller then purchases the security at a later time in
order to return it (Figure 1). A short sale becomes
covered once the short seller purchases the security to
return to the lender.

Figure  I. Example  of How  Short Sellers Make  Money


Institutional investors
receive the shares back.



           returns the
shares to the broker
and books a gain.


      I,  buys
the same number of
shares back at a lower
market price.


Institutional investors
lend shares.


shares from abroker
for a fee.


Y  4


         I-sells the
borrowed shares at the
current market price.


The shares lose value as
expected by the short seller.


Source: CRS.


If the price of the security decreases (as expected by the
short seller), the short seller profits by returning the security
after purchasing it at a lower price than it was sold. The
short seller loses money if the share price increases. From
this perspective, short selling is potentially riskier than
long-only investing. The maximum  loss for a long investor
is 100% of a stock's value. In contrast, short sellers face
unlimited losses because, in theory, there is no limit to a
stock's potential price appreciation and so no limit on the
price at which short sellers may be obliged to purchase
shorted stock to deliver to a lender.


Benefits  and Concerns
Benefits of short selling include (1) Pricing efficiency.
Efficient markets require that securities prices fully reflect
available information, including all buying and selling
interests. Short selling allows market participants, who
believe that a security is overvalued, to express their views
in market transactions. These transactions help the markets
arrive at more efficient prices by allowing market
participants with negative information about stocks to trade
based on that information even if they do not have pre-
existing long positions. In addition, arbitrageurs could use
short selling to profit based on price discrepancies between
positions that generate similar economic exposures, such as
between  securities and certain derivatives instruments (that
derive value from underlying securities). (2) Market
liquidity. Liquidity refers to how quickly and easily
transactions can occur without affecting a security's price.
A high level of liquidity indicates market health and
efficiency. Short-selling operations contribute to market
liquidity by supplying securities available for trading and
potentially offsetting imbalances between supply and
demand.  (3) Market discipline. Some academic research
has found negative correlation between the threat of short
selling and earnings management (the use of accounting
techniques to manipulate a company's earnings). Short
selling may thus have the effect of disciplining corporate
management.
Short selling has also generated criticism. Some contend
that short selling is often a form of market manipulation.
Some  short sellers may, for example, spread false rumors to
drive down share prices or collude with one another to
move  prices lower (a strategy that is often called a bear
raid). Abusive short-selling activities, such as coordinated
transactions to depress the price of a security for a short
sale gain, are illegal. In 2008, during the Great Recession,
the United States and other countries imposed bans on
certain short-selling activities, hoping to mitigate share
price declines and reduce market volatility. Section 12(k) of
the Securities Exchange Act of 1934 gives the Securities
and Exchange  Commission  (SEC)  the authority to
temporarily prohibit short selling in certain emergencies.

Naked Shorts
A naked  short is a short sale conducted without
borrowing or arranging to borrow the relevant shares (but
agreeing to deliver them at a later date). Naked shorting
may  result in a failure to deliver the shares to the buyer. For
example, the short seller, who trades illiquid shares, may
have trouble buying the securities when the time for
delivery comes up. Some naked  shorts are in violation of
securities laws. But not all naked shorts are illegal. For
example, certain market maker activities that involve
broker-dealers making a market by committing to

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