This week’s stock shocks as on 10th April, 2026
Picking US tech stocks meant tracking earnings cycles and product launches and leaving the cybersecurity drama to the enterprise CISOs. Not anymore. Anthropic’s Claude Mythos Preview—a frontier AI model that reportedly uncovered thousands of high-severity zero-day vulnerabilities across major operating systems and web browsers, sent shockwaves through tech and cybersecurity circles alike. Whoever controls AI-driven security increasingly shapes who wins the next enterprise spending cycle.
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US equities posted modest gains for the week, but the headline that mattered wasn’t on any earnings calendar. The Anthropic story triggered a visible rotation—AI infrastructure names and cybersecurity plays rallied, whilst legacy software and some cyclicals wobbled. Investors speculated about deeper collaboration between Anthropic and large cloud and chip providers like Nvidia, Amazon, Google, Microsoft, and Apple, though concrete commercial announcements remain limited for now. It was a week when a single model demo rewrote the near-term narrative for billions of dollars in enterprise spending.
Market recap 📊
US equities closed the week modestly higher, with AI infrastructure and cybersecurity names doing the heavy lifting. The S&P 500 ended the week in the high-6,800s, the Nasdaq near the mid-18,000s, and the Dow in the low-40,000s—indexes ending the week modestly higher, extending a multi-week run of gains.
Monday opened flat as traders digested the tail end of the prior week’s macro data. By Tuesday afternoon, the Anthropic story had spread across trading desks, with cybersecurity ETFs jumping meaningfully intraday as the implications of Mythos’s vulnerability findings sank in, per CNBC. Wednesday saw profit-taking in mega-cap tech, with Apple and Microsoft both slipping as investors questioned whether legacy operating systems faced structural headaches. By Thursday, cooler heads prevailed—the narrative shifted from “existential threat” to “accelerated spending cycle,” and tech rebounded.
Futures heading into Friday’s close were modestly positive, with CrowdStrike and Palo Alto Networks both trading near session highs. The market wanted to believe this was a rising-tide story, not a zero-sum reshuffling.
Sentiment watch 😶🌫️
The CNN Fear & Greed Index hovered in neutral-to-mild-greed territory through the week—consistent with a market that’s constructive but not euphoric. The reading reflected the market’s split personality: bullish on AI’s next chapter, but wary of what gets disrupted along the way. Neutral sentiment leaves plenty of room for a melt-up or a correction—neither feels locked in yet.
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Best performers of the week 🏆
Cybersecurity and AI infrastructure dominated the leaderboard. Here’s who thrived:
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