Shares of Paratek Pharmaceuticals Inc. (PRTK) - Get Report were down 9.6% to $23 in premarket trading on Friday, June 30. The Boston firm focuses on therapies based upon its expertise in tetracycline chemistry.

Meanwhile, shares of Opko Health Inc. (OPK) - Get Report rose 3.5% to $6.87. The Miami-based firm's businesses include diagnostics, pharmaceuticals and biologics.

Other biotech movers include Endo International plc (ENDP) - Get Report . Shares of the Dublin-based pharmaceutical company were up 3% to $11.57.

Jim Cramer and the AAP team share their thoughts on Walgreens Boots Alliance Inc.'s (WBA) - Get Report deal to buy 2,186 Rite Aid Corp. (RAD) - Get Report stores. Find out what they are telling their investment club members. Get a free trial subscription to Action Alerts PLUS.

Meanwhile, over on Real Money, Jonathan Heller writes that Monomoy Capital Partners, which is buying West Marine Inc. (WMAR) for $12.97 per share in a deal announced June 29, "is getting a heck of a bargain at that price."