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Because it is an automated response to your account situation.

Since SPY is very liquid with narrow spreads, how did that cost 10% of your equity?

Since many do not have a 25 delta options, it will require you to make many assumptions that will not be accurate from one stock to another where they each have their unique skew. You are looking for one formula and I expect that will not work. What value do you get from it if you are looking to...

I had to look that one up.

You are allowed on one exchange to BTO and STC, but not BTO and STO. THere is no restriction to do that on two exchanges that I know of except it is not practical as each order must be tagged correctly. E.G. buy to open 10 calls at 1.00, sell to open 10 calls at 1.05. Once you buy 1 contract...

Why would you not call or email IB? I don’t see how anyone here can help you.

I was just trying to answer the question. Most company stock plans are at Computershare. I do not expect they do this.

No, not for short call, only short stock.

Ok, I got lazy and admit that I did not read all the responses. If your short calls and your stock are held at different brokers, to get an offset of risk and margin it would require a tri-party agreement. I'm not an expert on these so here is some information on the BNP Paribas website...

Clearing firms charge fees for being short stock that is hard to borrow. That is how they make money.

You are making this too complicated. If you have no stock position, and you get assigned a call, you will be short the common. Your clearing broker needs to make delivery by borrowing the shares in house or at another clearing broker. If they can't borrow the shares, it is called a failure to...

Yes, the OCC can direct part of that assignment to your short. You can't be bought in while the stock is halted and they might be able to borrow the stock, you never know. You might end up with a high margin requirement until the stock resumes and you can buy it back. If delisted, it would be...

Yes, but if the call is OTM, why would the buyer exercise after bad news and a halt?

I'm more of an expert on PM than Reg-T. As a blanket statement, I would NEVER tell a client or perspective client that we will NEVER raise margin or limit risk in the future. I did business with Apex at my last firm. We do business with Wedbush now. Your clearing broker and when you have one...

Reg-T or PM?

Not sure what that means or how they can say that. They clear APEX and APEX sets margin not the broker. The broker can only raise the requirement not lower it. Good luck..Bob

That might be considered market manipulation if you offer on one exchange to get someone to match, then take their offer and cancel. Just avoid trading very wide markets.

Different, not better. We cater to the active traders with a choice of software and routing. Fidelity caters, like TD, to investors.

No. the default limit is 10,000 shares.

This is the short answer-both. Lightspeed Trading LLC and Sterling Trading Tech were both owned by the same holding company up to May 1 when Lightspeed Trading LLC merged with Lime Brokerage. Now we are Lightspeed, a division of Lime Brokerage and Sterling Trading Tech is an independent...