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B = buy (open market, aka the stock exchange)
S = sell (open market)
PB = buy (private, aka transacting with another person or institution so as not to move the market)
PS = sell (private)
JB = Gift Buy (no idea what this means)
JS = Gift Sale
OE (or sometimes X) = option exercise
144 = transaction as part of a pre-filed plan
3 = new insider filing

All types of insider trading are of interest.

It's more complicated. You also have to look at how much of the stock insiders own.
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