Why Is CALIX INC (CALX) Stock Down Today?

Why CALX stock is down today

Calix (CALX) shares fell 4.95% to $36.45 in Monday’s session as investors reacted to a mix of strong earnings results and concerns over margin pressures. Despite the company reporting record second-quarter revenue and a non-GAAP EPS beat, gross margins declined due to rising memory costs linked to its AI initiatives. The stock opened with a 14.5% gap down and traded in a wide range throughout the session.

What Happened

Calix reported second-quarter 2026 results showing non-GAAP earnings of $0.47 per share, exceeding estimates by $0.07. Revenue came in at $293.3 million, a year-over-year increase of 21.3% and a $3.35 million beat. The company highlighted early traction for its AI-native Calix One platform, with management noting accelerated customer demand for AI-driven broadband tools. However, the benefits of these results were offset by declining gross margins, which were attributed to rising costs for memory components driven by AI development. The company filed a Form 8-K on July 20 to disclose these results, and a management call was held on July 21 to discuss the quarter in detail.

What The Data Shows

The stock opened at $32.80, a sharp decline from the prior close of $38.35. It reached a session high of $36.54 at 11:10 AM ET and a low of $32.63 at 7:05 AM ET. Trading volume was 1.1 million shares, matching the 3-month daily average. Over the past eight sessions, the stock had moved up 0.8% from $39.28 to $39.59. The current price of $36.45 sits near the lower end of its 52-week range of $34.86 to $71.22.

What To Watch

Calix’s next key event will be the release of third-quarter guidance, which management discussed during the July 21 earnings call. Investors will also monitor coverage breadth as the stock continues to trade at a P/E of 79.8 and a net margin of 3.2%.