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I am short TSLA, 240 calls and 265 calls. TSLA makes great cars but they have negative profit margins and an absolutely absurd, dotcom-bubble-era valuation.

I suppose you could get around it by only trading SSFs and having a historical dataset for SSF prices, but the stocks with SSFs tend to be the same few stocks that have liquid options.

That derived dataset would tend to be really inaccurate for stocks with thinly traded options with gigantic bid ask spreads. i.e., most of the interesting stocks.

Stock prices rise and fall in response to interest rates for the same reason that bond prices rise and fall in response to interest rates...

Pick any one marketplace like AQS and use that then... If SLB is a reasonably efficient market then that will be close to the rates everywhere else.

I want to have 10 years of history of how much it cost to borrow each listed security for shorting it. Does this dataset exist anywhere? Couldn't find it on Quandl or google. Without that dataset, there's no way to properly test a trading algorithm that might trade hard to borrow stocks...

A PE ratio over 500 on a company the size of AMZN is crazy. It's like the dotcom bubble all over again. They have to grow earnings by 30x to justify it. That would take at least a decade at realistic growth rates, so then you have to discount the value of the future earnings because they're...

Occasionally it has something interesting, but it's mostly crazy clickbait.

According to the CBOE website, they let you hedge a short SPXPM option with an identical long SPX option (but not vice versa), so I can close it out that way if I can't fill at a good price on SPXPM. Does anyone know if that will work on IB?

Looks like they completely ignore the options margin formula that's posted on their website when you have portfolio margin. To naked short 100 SPXPM Dec '18 500 puts @ $3.3, the maintenance margin is only 11k According to their posted formula, it should be around 500*100*100*0.1 + 33k = 533k...

We've had a recession every 7-10 years for 40 years... 2008, 2001, 1990, 1981, 1973 It's about time for one.

Is any kind of chartism legit? Has anyone actually backtested this strategy?

US GDP growth has been shitty for the last 16 years because the US' economic freedom index has been dropping like a rock for the last 16 years. All those economically illiterate youths feeling the bern are not good for the economy.

If you're willing to take interest rate risk instead of market risk, you could buy EDV. It has a beta of negative 0.6. It goes up whenever SPX goes down because of flight to quality. This is an essentially free way to hedge against SPX decline, as long as interest rates stay low.

I want to short as many Dec 2018 SPX 100 puts for $0.20 as I can without getting margin called, because they're 100% guaranteed to expire worthless. Why would anyone ever buy them? You can't hedge against nuclear armageddon.

Suppose I naked short a thousand deep out of the money puts for $3, and suppose they're extremely illiquid, with a usual bid of $1 and an ask of $5. The margin formula uses the put price, but doesn't define it. I can think of a lot of ways they could define the price of the put, and it...

You have to deliver one way or another, so if you can't locate shares to borrow you have to buy in.