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#market mechanics

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Why Stop Orders Fill Below Your Stop

Why stop orders fill below your stop price: the trigger becomes a market order, and overnight gaps, fast markets, halts and thin sessions set the fill.

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The 10:00 AM Rule in Stocks, Tested

The 10:00 AM rule says wait out the opening 30 minutes. We tested it on three years of minute bars: how much range and volume the open really puts in.

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What Time Do Options Start Trading?

What time do options start trading? US listed options open at 9:30 a.m. ET. Here is the 7:30 a.m. order acceptance window and the overnight index session.

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How to Find a Stock's Earnings Date

A company sets its own earnings date and confirms it in a press release and an 8-K filing. Here is where to look, and how far an estimated date can move.

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How to Find a Lockup Expiration Date

A lockup expiration date lives in the IPO prospectus, not on a calendar page. Where to find it, and why counting 180 days from the first trade gets it wrong.