AIS is Accounting Information System.
MINIMUM QUOTE SIZE REQUIREMENT, NASD Rule 6650, is the minimum size at which a market maker is permitted to display bid or offers in the BBX. The minimum size required depends on the price of the stock. For example, all quotes on the OTCBB priced under $0.50 have a minimum quote size of 5,000 shares.
DUN is when you importune (beg or are insistent upon) a debtor for payment: a dunning letter.
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