Stocks making the biggest moves midday: Firefly Aerospace, AutoZone, Sempra, Halliburton & more

Oil services firms like Halliburton and Baker Hughes advanced as crude prices rebounded, while Sempra rose 4% after a $10 billion infrastructure unit sale and a $14 billion LNG expansion plan. McKesson gained over 6% on robust fiscal 2026 profit guidance, contrasting with Firefly Aerospace's 12% drop due to a wider-than-expected post-IPO Q2 loss and AutoZone's decline after missing Q4 earnings and withholding FY26 guidance. Boeing also saw gains amid reports of a major aircraft deal with China.

Analysis

Midday trading reveals significant divergence across sectors, driven by company-specific catalysts rather than a broad market trend. The energy sector shows notable strength, with oil services firms like Halliburton and Baker Hughes rallying up to 8% on a rebound in oil prices. Sempra Energy advanced 4% following a strategic move to sell a 45% stake in its infrastructure unit for $10 billion, which will fund a substantial $14 billion expansion of its LNG facility, signaling a clear pivot towards LNG export growth. In healthcare, McKesson surged over 6% after issuing robust fiscal 2026 guidance, with an adjusted operating profit forecast of $6.2 billion to $6.4 billion, exceeding the $6.17 billion consensus. Conversely, the automotive retail sector faced headwinds as AutoZone fell 3% after missing fiscal fourth-quarter earnings expectations and, more critically, declining to provide a forecast for fiscal 2026, injecting significant uncertainty into its outlook. The aerospace sector presented a stark contrast between established and emerging players; Boeing gained 2% on reports of a potential major aircraft deal with China, while the recently public Firefly Aerospace plummeted 12% after reporting a wider-than-expected loss and lower revenue in its first post-IPO quarterly report.

Key Decisions for Investors

• Investors should view McKesson's strong FY26 guidance as a key positive differentiator, potentially justifying a re-rating of the stock as profit forecasts are revised upwards.
• The combination of an earnings miss and withdrawn guidance at AutoZone warrants significant caution, and exposure should be re-evaluated pending future clarity on its business outlook.
• Sempra's strategic capital recycling into a major LNG expansion project presents a long-term growth opportunity, but investors must weigh the execution risks of the $14 billion facility against the potential upside from global LNG demand.
• The potential for a major Boeing aircraft deal with China is a significant near-term catalyst; investors should monitor for official confirmation, as it could substantially de-risk the company's delivery outlook.
• The rally in oil services stocks like Halliburton and Baker Hughes is directly linked to commodity price volatility, making it a cyclical trade that requires monitoring the sustainability of the current oil price recovery.