#### The Short Seller Restriction Rule (SSR) Explained for Day Trading

## What is short sale restriction?

Short sale restriction (SSR) is an interesting trading rule that was established in 2010 and is not always popular...

4 min read

**
Al Hill
** :
** Jun 20, 2019 **

Last Updated: May 18, 2022

* Alton Hill is a Cofounder at TradingSim. He has a passion to help people and found that one of his ways of doing so, is through the world of Day Trading. Alton’s skillset is in Product Development and Design Thinking which he uses to write and improve the overall experience for TradingSim. *

I feel like I am on an oscillator craze lately, but if it feels right, why fight it?

The Williams %R indicator is pronounced *Williams Percent R*. The indicator is the creation of famous technical analyst and charting enthusiast Larry R. Williams. ^{[1]}

The Williams %R is a momentum indicator, which gauges if a stock is overbought or oversold.

In this post, we will discuss how to calculate the indicator and 3 trading strategies you can test in the market.

I am the first to say not to worry about remembering an equation by heart. However, I do believe it is important to understand its underlying components.

**(Highest High _{n} – Close_{current period}) ÷ (Highest High_{n} – Lowest Low_{n}) x -100**

As you can see above, the indicator is all about the high, close and low prices. Another way of thinking about the indicator at a high-level is that its primary focus is to identify the volatility and momentum for a security.

The _{n} in the formula is the number of periods or candlesticks in the equation.

Although Larry Williams initially calculated the indicator using 10-periods, your charting package will likely use 14 periods. The number of periods is configurable by you; however, it’s a slippery slope once you start mucking around with the settings.

The oscillator has a range of -100 to 0. Readings below -80 represent oversold territory and readings above -20 represent overbought.

Now, this does not mean you should buy readings below -80 and sell readings above -20.

During a strong uptrend, a stock can hover around -20. Conversely, in a strong downtrend, a stock can stay in the -80 territory.

No discussion about the indicator would be complete if you do not compare the indicator to the Stochastic Oscillator.

While there are two variants of the Stochastic Oscillator, the formula below is for the Fast Stochastic Oscillator ^{[3]}.

As it has two plotted lines, %K and %D, the formula to calculate these two data points are as follows:

**%K = (Close _{Current Period} – Lowest Low_{n}) ÷ (Highest High_{n} – Lowest Low_{n}) * 100**

**%D = 3-Day Simple Moving Average (SMA) of %K**

As you can see, the Williams %R is the inverse of the Fast Stochastic Oscillator.

The Williams %R indicator represents the level of the closing price to the highest price for “x” number of periods. By contrast, the Fast Stochastic Oscillator represents the level of the closing price to the lowest price for “x” periods.

The Williams %R multiplies the formula by -100 whereas the Stochastic Oscillator multiplies the formula by 100.

As you can see the movement is essentially the same. The one major difference is the stochastic oscillator gives you a trigger line which you can use to execute entries and exits.

Instead of using the indicator for simply identifying overbought and oversold market conditions, you can develop a trading plan around the -50 line cross.

After becoming overbought and oversold, if the indicator crosses the -50 line, it generally indicates a shift in momentum. At this point, you can start to look for opportunities to trade the stock direction of the cross.

In the above chart example, the %R of MSFT was overbought. The stock price then began to decline and the %R crossed below the -50 line.

Once crossing below -50, you then wait for the bar to close to place a sell order.

As you can see, the bar that pushed the indicator reading below -50 was a bearish outside (BEOB). If you simply placed a sell stop order below the low of this bar, you would have entered the market when the bearish momentum was at its highest. Hence, you could have gotten away with placing a smaller stop-loss, which would, in turn, increase your risk to reward ratio on this particular trade.

You can use this same strategy to take a long position when the %R crosses above -50 from after being oversold for some period of time.

If you are familiar with divergence, you essentially want to find points areas where price and the indicator are in conflict.

Williams %R divergences are very powerful you should pay attention to these when it happens. In the above chart, you can see AMGN formed a clear downtrend; however, the Williams %R made a higher high.

This kind of divergence suggests a trend continuation. As you can see, after forming a bearish price action bar, the AMGN price shortly resumed the downtrend and you could have easily placed a sell stop below the bearish bar to capture this short swing.

Have you ever heard of the strategy where you ride Bollinger Bands? Well, you can do the same thing with the Williams %R.

Here is the setup and you will love its simplicity.

First look for the indicator to break -20 to the upside, so the shading kicks in. Then wait to see if the indicator can stay below -30 for 10 periods in a row.

If the stock is able to show this level of strength you can then use the first dip as a buying opportunity to jump on the primary trend.

As you can see in the above chart, once you are in the position, you can then ride the stock until the stochastics breaks -30 on the way down.

The hardest part of this strategy is not pulling the trigger too soon.

Since Williams %R lines are similar to the Fast Stochastic Oscillator, you can simply use the Stochastic Oscillator. But, remember that the intended trading strategy of the Williams %R is completely different compared to the Stochastic Oscillator.

Like other momentum indicators, it has its flaws, as it can remain extremely overbought during an uptrend and vice-versa ^{[4]}. However, as we showed here, you should not use the Williams %R to blindly take a position in the market based on its overbought and oversold readings.

Instead, if you trade smartly by combining price action and use the indicator to confirm the momentum in the market, your chance of ending up with a profitable trade would increase tremendously.

If you are interested in the Williams %R, you can practice trading with the indicator against real-tick data within Tradingsim. First, see if the indicator works for your trading style before placing real trades in the market.

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