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Ciena Corporation and Coherent Corp. — both members of Networking / Optical.
Pearson correlation of daily log-returns over the last 252 trading days. >0.6 = tight (move as one bloc); 0.4–0.6 = thematic linkage;<0.4 = largely independent. See the full matrix.
Want the full picture? CIEN stock page · COHR stock page · full correlation matrix
Data refreshes daily. Last close —.