Artificial-intelligence stocks came under pressure Monday, with optical and networking stocks among the leading decliners.

Shares of Ciena

CIEN, Lumentum Holdings LITE and Coherent COHR closed down 10%, 9.8% and 7.9%, respectively, while shares of Cisco Systems CSCO, Corning GLW and Lumen Technologies LUMN fell 2.6%, 6% and 4.3%. Marvell Technology’s stock MRVL lost 3.4%.