How 'some' players go short on OTC:
TradeStation: $5k minimum, best chance at shorting Nasdaq pumps, contact Peter Albino Registered Representative, Toll Free: 888-735-1222, Phone: 954-652-7403, Fax: 954-652-5403, PAlbino@TradeStation.com
Thinkorswim: $3k minimum, highly recommended, but tough to get borrows on OTCBBs/Pink Sheets
SpeedTrader: same recommended as Thinkorswim, but $25k recommended minimum to get better executions on OTCBBs/Pink Sheets and with monthly fees if you don’t trade enough
Broad Street: prop firm which has good borrows, but you can only short intraday
Interactive Brokers: $10k minimum, best for shorting OTCBBs/Pink Sheets, but shares go fast, 1st come 1st serve, terrible customer service
