NEW YORK (AP) — After feeling the thrill of victory early this year by singlehandedly causing GameStop's stock to soar — only to get crushed when it quickly crashed back to earth — armies of smaller-pocketed and novice investors are back for more.

These undaunted investors have resuscitated GameStop shares back above $300, up from $40 in February after plunging from a peak of $347. They're also hauling new stocks onto the bandwagon they say is heading for the moon, including the lesser-known health insurance company Clover Health Investments.

This second wave of leaps for meme stocks are just...