12b - not much as far as i can tell
Regulation SHO was supposed to rein in the abuses of naked short selling by focusing on stocks whose short interests indicate that entities who were supposed to have borrowed shares to sell short were not delivering their shorted shares to the broker they borrowed them from.
I do not use the SHO list myself, but I think other traders might.
I prefer to estimate what the "free float" is on a highly shorted stock, and if it small or non-existent, because more shares have been shorted than exist in the float, I watch for squeeze action due to that potential.
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