Not really relevant because I pretty much have never gotten more than 100 in any offering from Fidelity - they don't get that many shares, so they try to spread them out among their many customers. (I have only ever asked for shares in hottish IPOs that look like they may pop some on the open, and Fidelity essentially prohibits trades for 15 days post IPO, so no "flipping" is possible).
I've heard of people with big accounts getting more of hot IPOs at some discount brokers like Schwab. But mostly it's the folks (and particularly institutions) with accounts at the lead underwriters that can get significant allocations.
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