Old School: Law firm(s) may see fit to file a class action in court on behalf of all those who purchased shares of SK3 Group, Inc (SKTO) within a specified period of time (Class Period), usually months. If so, the law firm(s) will announce via press release(s) that investors who purchased common stock SKTO during the Class Period may move the Court to appoint them as lead plaintiff. A lead plaintiff is a necessary representative party acting on behalf of other class members in directing the litigation. Your ability to share in any recovery doesn't require that you serve as a lead plaintiff. The law firm will ask investors to contact them. In the case of PHOT, several law firms sprang into action.
You can wait for the law firms to manifest in their press releases, or you can call a law firm yourself to get the ball rolling. If you follow the news trail of PHOT for April/May, you will see the names and numbers of several law firms that rose to the occasion, one of them a very large and prominent law firm in Philadelphia.