Extreme Networks nearly doubled with a 94.4% gain in H1 2026, demonstrating strong performance in the optical networking infrastructure rally driven by AI demand, though still trailing Ciena's exceptional returns.
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Sources: Massive / Polygon daily aggregates (split-adjusted) · SEC filings via Massive · FINRA settlements via Massive · Financial Modeling Prep. Figures are dated where shown; research is informational, not investment advice. Methodology