RBBN ▼ -1.0% - Ribbon Communications Inc. $RBBN RBBN - Ribbon Bolsters Its Market-Leading Critical Infrastructure Portfolio Ribbon Communications announced an expansion of its critical infrastructure portfolio, though the company's stock declined 1.0% today despite the positive development. The announcement underscores Ribbon's competitive positioning in infrastructure communications, a market segment central to its growth strategy. 01-SEP-2026 08:03 AM ET