# Questions tagged [short-selling]

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### Can you hedge against a short squeeze with call options?

https://finance.zacks.com/high-short-interest-ratio-potential-sizable-short-squeeze-3371.html claims you can hedge against being squeezed out of your short position by buying call options with a ...
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### Theoretical returns are not matching empirical ones in my backtest

I'm trying to implement a Backtest for my quant strategy but the calculated theoretical returns are not matching the returns from my implementation. Here's the example: On a given day I have 1 million ...
301 views

### Strategies for trading on a forecast

I have been experimenting with multiple methods of forecasting the daily high and low for a certain security. I have found a very basic ensemble of several common forecasting approaches is, well, ...
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### Is it possible to calculate logarithmic return for short position? [closed]

In the book "Python for Algorithmic Trading" by Yves Hilpisch, it calculates the logarithmic return by summing up all the log values. When calculates the profit for long position: log(...
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Is the formula for the Maximum Adverse Excursion for a Short Selling Trade the (Open - High) / Open, or (High - Open) / Open ?
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### Basic stock shorting question [closed]

So im just a little cloudy on how shorting a stock drops the share price. I understand that you borrow, or set aside shares from your brokerage to then buy later at the origional price. My guess was ...
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### How can short-interest ratio be decreasing when price of a stock is decreasing and amount shorted is increasing?

So I am looking a particular amount shorted of a stock on bloomberg. The first panel clearly shows that SI ratio is decreasing on the last data point. Also simultanously it shows the price of the ...
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### Stock borrow cost timeseries

I am looking to increase the robustness of some equity strategies that I am working on. Apart (maybe) from brokers is there anywhere online (and preferably for free) that has historic stock borrow ...
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### What does Short Volume in FINRA RegSho actually measure?

When reading RegSho, I see a table like this: ...
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### Enforcement method of short contract

A stock short seller promises to pay back a stock at a certain date, but what is the mechanism that actually forces them to buy the stock? I've read that it is the broker who will do a margin call and ...
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### Without Bloomberg, how can retail investors know how many shares have been shorted daily?

Many friends can't afford a Bloomberg terminal, particularly when the pandemic has unemployed some of them. This answer can't assist them. How else can amateur investors determine the number of ...
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Why is it more common for Institutional Traders to short sell stocks when they have a bearish stance instead of Buying Puts? The limited loss potential of Buying Puts seems like a better choice.
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### What happens to a short seller if there are no shares available for sale under any price when it is time to return the shares they borrowed?

Assumptions: There is a limited number of shares in any given company. Someone that holds shares cannot be forced to sell them if they don't want to. In theory, it's possible for someone to buy out ...
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### How can anyone know how many shares have been shorted?

(Disclaimer: I'm not in finance. I'm just curious) Some news sources were saying today that 140% of GameStop shares have been shorted. How can the journalists or anyone else know this number?
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### Why is naked short selling "difficult to measure"?

The Wikipedia article on naked short selling says It is difficult to measure how often naked short selling occurs. Fails to deliver are not necessarily indicative of naked shorting, and can result ...
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### How quickly can someone pull out of their short?

Investors who short a company might get into trouble if a group of passionate online day traders (who like the shorted company) decide to boost its stock value by coordinated investments. How quickly ...
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### Derivatives to short municipal bonds based on cryptocurrency [closed]

Can you short municipal bonds with a cryptocurrency derivative? This is notoriously impractical in traditional finance, but there could be a crypto-based derivative designed around it. Is this a thing?...
1 vote
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### Standard deviation formula with Short selling- Markowitz model

I have 2 fast quastions. Before I begin I want to show you that I found minus before SD of bills in the book Principles of corporate finance(1.screen). I know SD of bills is zero and minus in this ...
1 vote
96 views

### Can arbitrage arguments be rearranged to avoid selling? (Hull, Chapter 5)

Suppose forward contracts are traded on a consumption asset, so there aren't necessarily people ready and willing to sell the asset to jump on an arbitrage opportunity. Suppose the asset has no yield, ...
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### Portfolio Optimization sum of weights constraint with short selling

For mean-variance portfolio optimization with short-selling allowed I have seen 2 ways to specify the portfolio constraint. In most resources I've seen, such as https://www.coursera.org/learn/...
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### Backtesting short-selling strategy using pandas dataframe

I would like to make a simple backtest for one of my short-selling strategies. I am using pandas dataframes. So I have a dataframe like the following, that indicates how many positions to open/close ...
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### Normal VaR for short bond

So I'm short a GBP denominated zero-coupon bond which has a face value of 1 million pounds and a remaining maturity of 6 months. Furthermore, I have to assume that the daily return of a 6-month zero ...
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### How do Hedge Funds account for returns from short selling?

I was going over my notes from an Asset Pricing module yesterday and came across something interesting I hadn't thought about in a while. It was how Hedge Funds can over inflate their performance by ...
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### short squeeze basic questions

I have a question that might appear simple for the more experienced here. I'm trying to understand the concept behind short squeezes and i'm a little lost. From what I understood: Short selling ...
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### Modeling short-selling accounts

I am having trouble modeling short selling mechanics in my backtesting system. When I sell stock short, I make the following changed to account variables: Credit Balance += 200% of the stock value ...
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### Market neutral without short selling

Would it be possible to design a market neutral strategy without short selling? According to Investopedia: Market-neutral strategies are often attained by taking matching long and short ...
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### Can scientific discovery be used to short stock without being considered insider trading?

Let's say you make a scientific discovery that destroys the business model of a publicly traded company, for example you find a way to factor large integers in polynomial time (destroying the business ...
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### How and why is there a restriction on short sales?

I'm taking a course on the fundamentals of financial mathematics. This is my first quantitative finance course, so I'm still getting acquainted with a lot of the ideas. We covered the notion of a ...
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### Futures short interests vs open interests

I came across this article talking about "short interests" in VIX futures. My question is what does "short interest" even mean here? My understanding is that the futures are not "issued" (opposite ...
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### Cheapest instrument choice for low frequency long/short equity

I am trading a market neutral long/short equity portfolio. Right now I am trading cash equities, but I am interested in replacing some or all of the cash equities with derivatives, either single stock ...
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### Short Interest for CBOE

Does anyone know why websites (yahoo finance, morningstar etc) do not show short-interest for CBOE after Sept 14th 2018?
1k views

### How equity dilution could be profitable for short sellers?

I am trying to understand the concept of dilution. According to https://www.investopedia.com/terms/d/dilution.asp, dilution is Dilution is a result of a reduction in the ownership percentage of ...
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### Comparing short selling profits across positions

For academic purposes I try to estimate the profitability of a short position while not knowing the margins and cost associated with shorting, thus I am only interested in the gains or losses made ...
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### How did this after hours massive NFLX short/long strategy make a profit? [closed]

I’ve seen thus market action 2 times now in the past few months. The first was before ADBE earnings release, and most recently was NFLX release. The setup: Earnings release pending after hours ...
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### Short sale and zero investmest strategy

Suppose I want to build a pairs trading strategy. Theory says that we can create a zero-investment portfolio by going long stock A and short-selling stock B, given a certain hedge ratio. My question ...
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### Compute allocation given long-short portfolio weights

The amount of capital allocated in each asset given long only weights is calculated as $allocation_i \ = K\cdot w_i$. ...
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### Short position returns with negative NAV

I am using data on the opening, change and closing of short positions, but I am interested in when the profit/losses are made. Hence, I calculated daily the value of the short position by taking the ...
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