NEW YORK (TheStreet) -- TheStreet's Jim Cramer says traders must accept the fact that activist investor William Ackman will not stop his campaign against Herbalife (HLF - Get Report) until the stock reaches zero and that a company can sometimes be defenseless in those situations. He advises investors to be careful with Herbalife, as Ackman could target individual company directors.
As for FuelCell (FCEL - Get Report), Cramer notes that any stock that quadruples (FuelCell had actually quintupled at one point this month) is vulnerable. He says FuelCell has a real business that could one day be profitable, but notes that investors have pushed the stock around in recent weeks. He adds the stock could trade down to $3 or up to $7.
Finally, Cramer thinks Symantec (SYMC) was too deep into desktop and not enough into mobile. He suggests caution on Symantec and instead suggests FireEye (FEYE - Get Report), which hit $96 and had a secondary public offering at $82 a share. He says FireEye "can't get out of its own way" and is a high multiple stock. Symantec may not climb simply because it is a low multiple stock.