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Butterfly: ... especially with crazy volatility stocks like GME. Feb 19 70 puts when the stock was 310 were 15.50. Around 23 today. I mean... stock is down 80%, the puts went up just a bit :) Not that I didn't expect that but still.

:) Carbon nanotubes are a good conductor so no fuel needed, just an electric motor. But yes, of course, material science needs to advance a bit to make this feasible.

And it can be a lot faster than 500 kph since once you get high enough that the air resistance is negligible, you can speed up quite a bit.

Don't know about the record but the other day I counted 17 LULD halts for GME

zghorner, I don't think greeks or B/S calcs would explain it (although I would welcome someone trying). The answer, I suspect, is that with wildly irrational moving stocks (such as GME) there can be wildly irrational options pricing simply because of the supply/demand pressure.

GME puts sometimes are not pricing rationally. Yesterday GME was down 30% and Feb19 100 and 70 puts were down 25%. Today it is more inline :)

AFAIU, the L2 feed that IB provides through their API is very much different (and a lot less) than what they provide in TWS. If the third-party software uses the API to get the L2 feed from IB, the quality of the L2 feed would be bad. That said, depending on the software, you may be able to get...

(I asked a broker friend of mine. This was his explanation, paraphrased) This happens because of internal in-house shorting. Meaning that the short borrowing may happen internally. When that happens, you may have a situation where if your Client A is long, he might not be able to sell before...

Sorry. I must have misunderstood the "I appreciate my broker looking out for me, and placing orders on my behalf with no option to cancel." I saw this passed around and the author doesn't say if it was a margin call. If it was a margin call, it was legit, legal, and probably required.

Was that a margin call?

That would have been significant in the non-zero-commission days. Not anymore. Brokers now seem to really want traders with either lots of cash (on the average) in the account or lots of margin. A couple-K-phone-trader-account is not that significant. At least that's what it seems like (I am not...

Insider sales are not immediately public.

Ok let's do back of the napkin calc. People claim there are millions of WSB redditors. WSB has 4.8M members, but obviously not all those participate. So let's say 1M, if you include their friends. And let's say each has on the average 2K to play with. That's $2B. GME daily volume on the day of...

I see 17 halts :) Most of them LULD, but not all, so don't know why some halts happened.

Wouldn't you know, CNN has it figured out. The GME/Reddit thing - it's Trump's fault. Of course. https://www.cnn.com/2021/01/27/politics/gamestop-stock-surge-trumpism/index.html

That's not true... There may be people who have the puts who want to sell them.

:) Everyone likes to see shorts get screwed. Unless they are one.

There are only a dozen threads about it.

Why not? You *can* allow buying stocks but not shorting them. So why not the same with puts?