Questions tagged [short-selling]

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78 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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1answer
297 views

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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1answer
102 views

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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1answer
48 views

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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42 views

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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8 views

Days to cover short interest ratio

How could we calculate days to cover if we have the total demand quantity? Is it equal to: $\frac{\text{total_demand}}{\text{average_daily_volume}}$ and do we need another short interest information?...
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1answer
126 views

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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35 views

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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59 views

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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24 views

How to short Turkey? How to get exposure to local currency-denominated debt?

After some research, I decided to open a short position on Turkish Lira (TRY), and I'm also looking to short TRY-denominated debt. To short the TRY-denominated debt, I'd need to short-sell a TRY-...
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1answer
39 views

Is this the present value of a short position on an option?

Consider a European put option, whose price at time $0$ is $\Pi_0$. Set: $$\mathcal{L}_0=\Pi_0 - P(0,t_M)\Pi_{t_M}$$ where 0 < $t_M$ and $P(0, t_M)$ is the discount factor from time $0$ to time $...
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48 views

How to Calculate Discrete Currency Returns for Short Positions

I need to calculate currency returns for 1) short selling the currency and 2) going long in the currency. When going long, the currency is sold at Forward price $F_t$ and bought at spot price $S_{t+1}$...
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2answers
90 views

European Call option combined with Short selling

How would I calculate the abitrage profit from a combination of buying the $10 European call option and short selling X number of shares at t=0 and the coming out with a profit at expiry no matter ...
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55 views

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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2answers
72 views

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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1answer
183 views

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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0answers
48 views

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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32 views

Short Interest for CBOE

Does anyone know why websites (yahoo finance, morningstar etc) do not show short-interest for CBOE after Sept 14th 2018?
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1answer
212 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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0answers
26 views

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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62 views

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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1answer
59 views

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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2answers
800 views

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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2answers
242 views

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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1answer
448 views

How to hedge a short VIX position with SPY

Assuming it's Nov 15th, and the SPY is trading at 217.2. Suppose I sell 11 contracts with Dec. 21 maturity. How many shares of SPY do I buy to hedge my VIX futures position?
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1answer
60 views

If by selling short assets, you get extra capital for your longs, can you actually be dollar neutral?

I have a strategy where I short index ETF worth 80% of my portfolio, it shows up in leverage because I've borrowed the asset to short, but now I have 1.8 times the initial capital because of short ...
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1answer
45 views

Short selling limits and institutional ownership

Why is Institutional holding considered a proxy for short-sale costs? In other words, Why are firms with lower institutional ownership more likely to be a subject of short-sale constraints? For ...
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2answers
387 views

How does short selling affect the leverage of a portfolio?

I know that if you short a stock you borrow it from a broker, immediately sell it, and then buy it back at (hopefully) a lower price. But I don't understand how it impacts the leverage of a portfolio....
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1answer
79 views

What incentivises short selling? [closed]

The borrower of the asset is incentivised by the belief that the relative value of the asset will go down (he can then sell it at high price now and buy back cheaper later). But what incentivises the ...
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0answers
38 views

How is the number of shorted shares for a given company publicly known?

I wonder how the number of shorted shares for a given company is publicly known. For example, http://www.wsj.com/mdc/public/page/2_3062-nasdaqshort-highlites.html (mirror) indicates the percentage of ...
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3answers
2k views

Equity short Interest data source

I'm looking for short interest data (those disclosed on 15 days basis to FINRA) As far as I know FINRA publishes only OTC data (http://otce.finra.org/ESI). Nasdaq.com contains only nasdaq traded ...
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1answer
104 views

Short selling volume reports

I'm researching short selling volume data reports from NYSE, NASDAQ and BATS (Sources: FINRA + BATS website). And my question is: Why are those numbers so high? Is it really just a speculative short ...
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1answer
1k views

How variance dispersion trades become short volatility

From this document, http://quantlabs.net/academy/download/free_quant_instituitional_books_/[JP%20Morgan]%20Variance%20Swaps.pdf, on page 56, it states that Losses from short correlation through ...
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1answer
909 views

How come SNAP does not have option chain?

I want to buy put options on the newly issued SNAP stock (Snapchat). How come the option chain is still empty? it's been a few days since the IPO.
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1answer
181 views

Efficient way to short Tesla

I believe that at 45B$ Tesla is massively overpriced. The thing is that I don't know how long it will take it to trade on fundamentals, maybe a couple of years after launching model 3. So I want to ...
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1answer
220 views

short selling with collateral accounting

I don't know how the accounting works for short selling with collateral: For example if a stock is \$10 a share and turn out to be $15 a share a week later. At time 0, you borrow and sell 10 shares ...
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1answer
531 views

How are ETF fees deducted? What happens if you short an ETF?

When I buy an ETF, the ETF issuer wants a certain management fee (expense ratio). How is this usually paid? I've read that this might be deducted from dividends - is this the case? How does it work ...
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3answers
192 views

What does a negative stock amount mean in a single-period, binomial market model?

Consider a single-period, binomial market model with a $r > 0$ interest rate (in USD per period) and a portfolio $(x, y)$ consisting of two assets: a savings/lendings account and a stock, both ...
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1answer
414 views

Prove arbitrage opportunity

The continuously compounded interest rate is $r$. The current price of the underlying asset is $S(0)$ and the forward price with delivery time in 1 year is $F(0,1)$. Short selling of the stock ...
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2answers
1k views

Under which conditions the minimum variance portfolio involves no short selling?

If $\rho_{12} < 1$ or $\sigma_1 \not= \sigma_2$ then $\sigma_v^2$ representing the variance of the portfolio with weights $(w_1, w_2) = (s, 1-s)$ as a function of $s$ attains its minimum value at: ...
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0answers
59 views

How does a Broker-Dealer lend shares to other Broker-Dealers?

Is it possible to find out how a OTC Broker-Dealer in thinly-traded equities lends shares for short-sales to other Broker-Dealers. Which platform or process is involved?
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1answer
82 views

How to simulate historical performance of a short position of a security?

I would like to calculate with R the inverse return of Bitcoin. My objective is to simulate the historical price and return of a short position opened in Bitcoin. The first method is to cumulate the <...
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1answer
135 views

Where am I making a mistake in my calculation of profit on a short-sale?

I am studying financial math and here is a problem and the solution from the author: Here are my calculations: The short sale is $200\cdot24.82 = 4964$. Now half of this amount will be taken for a ...
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1answer
330 views

Calculate short log return including fees

log long return is log((exitprice-fees)/entryprice) without leverage. log short return is the negative long return. So, from the above I would get short return = log(entryprice/(exitprice-fees)). ...
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1answer
149 views

Option writing optimal sell time

When selling options, e.g. a straddle I read often the optimal time for selling options is 30-40 days until expiration. For me intuitively the optimal time would be around one week until expiration ...
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4answers
271 views

How to short an option?

It appears to me that retail investors can only buy calls and puts, but not short them through any standardized way (except maybe borrowing the option from a friend ;) ). Is that correct, or how can ...
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2answers
441 views

Forex trading scenarios - calculating units

I'm trying to build an automated forex trading system and I'm trying to understand how to calculate the number of units I should specify for each trade in different scenarios. Say for example I have ...
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2answers
149 views

Calculating units in a cross currency short trade

If I have a forex account with a broker and a balance of 100 USD, and I'd like to short EUR/JPY, how many units can I short? How is this calculated? Which currency pair do I use to translate between ...
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2answers
274 views

Limits on Short selling

When back testing an algorithm that relies upon short selling certain stocks, how to limit the short selling so that the back-test results still remain reliable? What kind of controls are generally ...
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1answer
98 views

possible to estimate if hard-to-borrow?

I'm building a low frequency US equity stat arb system. On any given day the system is long ~100 stocks and short ~100 stocks. It trades once a day at the open, and on average 4/5 of the portfolio ...