BlockBeats News, July 21st, according to BIT (bit.com) market data, pre-market trading of U.S. stocks saw a general rise in fiber optic concept stocks, including:

PureFunds ISE Cyber Security ETF (HACK) rose by 3.81%;

Marvell Technology (MRVL) rose by 6.24%;

AAOI (Applied Optoelectronics) rose by 5.07%;

LITE (Lumentum Holdings) rose by 5.15%;

COHR (Coherent Corp.) rose by 5.23%;

CIEN (Ciena Corporation) rose by 3.94%.