I came across this Post on IHub. Interesting...
How To Spot Dilution
Once you learn how to use L2 dilution is very easy to spot. Always pay attention to who is on the ask. If it is just NITE or UBSS then most likely you won't see any manipulation. If you see PERT, VFIN, VERT or cosmetic MM's, know that they are the #1 diluters in the market. Cosmetic MM's are special MM's used by the company to help hide dilution from less learned traders. Some of them are PUNK, MERRI and VNDM. Sometimes it's easier to use them then the well known one's like VERT. If you are watching L2 and one of the diluters are there you will see massive volume on the ask but it will not UT on your stock, it's because they have a certain amount of shares to sell and will not move until they are gone.
You might think it's all buys but they are masked due to selling on the ask since they will come up green instead of red. Another thing here also is you can have millions bought on the ask and then it down ticks, posters will say MM manipulation but what is going on is it down ticked because the OS has gotten bigger due to VERT and others selling shares on the ask.
Here is a list of some of the more famous Market Makers (MM's)
Big Shorters: JIMK, POND, GNET or ARCA (anyone can use GNET, even other MMs because it's an ECN).
Wholesalers: ETRD, HRZG, MASH, NITE, SHWB, UBSS
Top Retail Dilutors: ACAP, AGIS, BAMM, BMIC, CHIG, CLYP, FANC, FRAN, JIMK, MAYF, MERRI, NATL, PERT, PUNK, SACM, UCAP, VERT, VFIN
