Stocks making the biggest moves midday: Tesla, Centene, Robinhood, Nike and more

Centene shares plummeted nearly 38% and pressured the broader health insurance sector after the managed care giant withdrew its 2025 guidance, citing lower marketplace enrollment and higher Medicaid costs. Concurrently, Robinhood climbed 7% on speculation of S&P 500 inclusion, while Tesla shares gained 4% as Q2 vehicle deliveries met estimates despite a year-over-year decline. Verint Systems jumped 12% on acquisition talks with Thoma Bravo, and a new US-Vietnam trade deal boosted shares of retailers like Nike with manufacturing in the region.

Analysis

The health insurance sector experienced a significant sell-off, led by Centene (CNC), which plummeted nearly 38% after withdrawing its 2025 guidance. The withdrawal was prompted by new data indicating lower-than-anticipated enrollment in key health insurance marketplaces and persistently high medical costs in its Medicaid business, leading to a projected adjusted earnings shortfall of approximately $2.75 per share. This news triggered a contagion effect, with Molina Healthcare (MOH) falling 18%, Elevance (ELV) 7%, and peers like UnitedHealth and CVS Health declining around 3%. In contrast, corporate actions and speculation drove notable gains elsewhere. Verint Systems (VRNT) surged 12% on reports of acquisition talks with Thoma Bravo, while Robinhood (HOOD) climbed 7% on speculation of an S&P 500 inclusion. Tesla (TSLA) shares rose 4% in a relief rally, as its 384,000 vehicle deliveries, though representing a 14% year-over-year decline and a second consecutive quarterly drop, were largely in line with analyst estimates. Other positive movers included Constellation Brands (STZ), which gained nearly 4% by reiterating its 2026 forecast despite a quarterly miss, and several retailers with Vietnam-based manufacturing like Nike (NKE) and On Holding (ONON), which rose on a new U.S. trade deal.

Key Decisions for Investors

• Investors should exercise extreme caution in the managed care sector following Centene's guidance withdrawal, as the cited issues of lower enrollment and higher costs may signal systemic headwinds for peers like Molina and Elevance.
• Consider monitoring companies subject to M&A reports, such as Verint Systems and Lands' End, for potential event-driven opportunities, while being mindful that these gains are based on speculation and not yet confirmed.
• Recognize that Tesla's stock gain is a reaction to meeting lowered expectations, not a sign of fundamental strength, as the 14% year-over-year delivery decline highlights persistent demand challenges.
• Evaluate exposure to companies with manufacturing in Vietnam, as the new trade agreement appears to benefit established operators like Nike, On Holding, and certain solar firms, potentially creating a competitive advantage.
• Differentiate between fundamentally-driven stock moves, like Constellation Brands rising on strong guidance, and speculative ones, such as Rigetti Computing's gain on a new 'overweight' rating for a nascent technology.