Positionlimit

What are Position Limits in Trading? Definition and Implications

Key Takeaways

A position limit caps the number of shares or derivatives contracts one entity can own to prevent market control.
Position limits aim to thwart market manipulation and excessive price swings.
These rules apply to stocks, options, and futures, varying by market.
Position limits generally do not affect individual traders but ensure market stability.
Limits are calculated on a net equivalent basis, considering overall market influence.

What Is a Position Limit?

A position limit is an ownership cap set by exchanges or regulators to restrict the total number of shares or derivative contracts that a trader or a group can hold, preventing excessive market control. These limits prevent market manipulation by ensuring that no entity can dominate a market, thus maintaining price stability and fairness for all participants.

Position limits provide critical market balance by curtailing undue influence by large traders or funds, ensuring a fair trading environment.

We explain how position limits are determined and why they're crucial for financial market stability.

How Position Limits Stabilize Financial Markets

Position limits are ownership restrictions that most individual traders are never going to need to worry about breaching, yet they do form an important purpose in the derivatives world.

Most position limits are simply set too high for an individual trader to reach. However, individual traders should be grateful these limits are in place because they provide a level of stability in the financial markets by preventing large traders, or groups of traders and investors, from manipulating market prices and using derivatives to corner the market.

For instance, by buying call options or futures contracts, large investors, or funds, can build controlling positions in certain stocks or commodities without having to buy actual assets themselves. If these positions are large enough, the exercise of them can change the balance of power in corporate voting blocks or commodities markets, creating increased volatility in those markets.

For example, in 2010 a hedge fund called Armajaro Holdings purchased nearly a quarter-million tonnes of cocoa and caused a price move that was statistically uncharacteristic. Cocoa reached all-time highs early in the year and futures contracts were in their highest state of backwardation ever recorded.12

Cocoa peaked in value early in 2011, but began declining from there. Six years later, the fund lost money on its cocoa investments as the price of cocoa fell 34% in 2016 on its way to making its lowest prices in a decade. The episode demonstrated two points of observation: cornering attempts can create statistically unusual price swings, and the effort is notoriously difficult and rarely worth the effort.13

Determining Position Limits in Trading

Position limits are determined on a net equivalent basis by contract. This means that a trader who owns one options contract that controls 100 futures contracts is viewed the same as a trader who owns 100 individual futures contracts. It's all about measuring the control a trader can exert over a market.

Position limits are applied on an intraday basis. While some financial rules apply to the number of holdings or exposure a trader has at the end of the trading day, position limits are applicable throughout the trading day. If at any time during the trading day a trader surpasses the position limit, they will be in violation of the limit.

Important

Traders may receive an exemption from an imposed position limit from the Commodities Futures Trading Commission (CFTC) in some instances.4

Additional Factors Influencing Position Limits

Another form of limiting influence on market prices is the change in margin requirements. Increasing margin requirements may not hinder an individual investor or group of investors, but it will increase the capital reserves necessary to hold the same number of positions, making it much more expensive to corner the market.

For example, in 2011 the margin requirements for gold and silver were changed, leading the prices of both precious metals to fall after strong rallies.5

Trading Economics. "Cocoa." Accessed July 19, 2021.

BBC. "Cocoa Investor 'Buys £650m of Beans'." Accessed July 19, 2021.

Bloomberg. "Cocoa Hedge Fund King Anthony Ward Said to Post First-Ever Loss." Accessed July 19, 2021.

CFTC. "Position Limits for Derivatives." Accessed July 19, 2021.

MarketWatch. "Gold, Silver Plunge on New Margin Increases." Accessed July 19, 2021.

Trading

Options and Derivatives