Hot or Not, Stock Market Edition: 05/15/2026

Happy Friday. Here are the stocks our Zen Ratings are smiling and frowning upon today:

• Hot: Asset manager Acadian Asset Management (AAMI) is picking up speed; specialty machinery player Generac Holdings (GNRC) just flipped the script with a massive earnings beat 
• Not: Is defense newcomer Firefly Aerospace (FLY) flying on hype? Plus, asset management giant Apollo Global Management (APO) gets a downgrade 

P.S. For more stocks making moves, check out our Zen Ratings Upgrades & Downgrades screener.

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🔥 HOT: Specialty machinery maker Generac Holdings (GNRC) is gaining serious momentum again after spending the past couple of years working through a post-pandemic slowdown in residential generator demand and excess inventory issues. Now, a much bigger catalyst is taking over: AI and data center infrastructure are creating enormous new power demand, and Generac is increasingly positioned to benefit through backup power systems and grid resiliency solutions. That shift is transforming the company from a simple “storm outage stock” into a broader power infrastructure play. The latest earnings report reinforced that story, with Q1 EPS jumping nearly 69% year-over-year to $1.25 and revenue climbing over 12% to $1.06 billion, while management also raised full-year guidance as commercial and data center backlog trends strengthened. According to WallStreetZen, GNRC holds a top-tier Zen Rating (A / Strong Buy), powered by a solid roster of Component Grades including an A in Growth and strong support from Financials, Momentum, and Safety.

The bottom line? Generac appears to be entering its next growth phase — and this time, the driver may be far larger and more durable than weather-related demand alone. For more high-growth stocks, check this out.

🥶 NOT: Defense newcomer Firefly Aerospace (FLY) is a reminder that exciting headlines don’t always translate into investable stocks. Yes, the company continues landing government and defense-related contracts — including work tied to the Air Force and missile defense initiatives — and yes, the stock is up a considerable 103% in the past year. But here’s what might hinder continued growth: profitability and scalability still remain far from proven. That’s the key catalyst weighing on the stock right now. Space companies can win contracts for years before turning into sustainable businesses, and investors are becoming much less patient with cash-burning “future story” names. Even with momentum across the broader space sector, Firefly shares have started sliding as traders rotate toward companies with stronger balance sheets and clearer execution paths. According to WallStreetZen, FLY now carries a D (Sell) rating, dragged down by weak Financials, Safety, and Valuescores.

The verdict? The long-term space opportunity may be real, but at this stage, Firefly still looks more like a speculative concept than a proven business, and that’s a dangerous place to be when market sentiment cools.

🔥 HOT: Asset manager Acadian Asset Management (AAMI) is quietly turning into one of the strongest momentum stories in financials, with a powerful mix of earnings acceleration and institutional buying interest. The company just delivered another strong quarter, with Q1 earnings climbing nearly 26% year-over-year, reinforcing that its quantitative and institutional investment strategies are continuing to attract assets in a competitive environment. That fundamental strength is now lining up with what could be a big technical breakout. Shares have already staged a massive recovery from their lows, with 30%+ gains in the past 3 months, but the continued strength suggests the market still sees room for upside. Our Zen Ratings assigns AAMI an elite A or Strong Buy rating, and the stock ranks near the very top of the asset management industry, supported by standout Sentiment and strong scores across Financials, Growth, and Momentum.

The verdict? This is one of those rare financial stocks where technical momentum and improving fundamentals are reinforcing each other at the same time — a combination that can keep a rally going longer than most expect. For more “smart money” stocks, check this out.

🥶 NOT: Not all asset management firms are Strong Buys right now. On the flip side, investing giant Apollo Global Management (APO) is cooling off despite an active dealmaking streak. The biggest issue is that investors are becoming more cautious about the private equity and private credit environment overall. Higher interest rates and tighter financing conditions make it harder to exit investments at attractive valuations, which can pressure fee growth and future returns even for elite firms like Apollo. That concern appears to be outweighing the company’s recent acquisition activity, with the stock struggling to sustain momentum (it’s down 9% in the past year) despite a steady stream of headline-grabbing deals. In other words, the market is starting to ask whether Apollo’s aggressive expansion is coming at the wrong point in the cycle. According to WallStreetZen, APO now carries a D (Sell) rating, weighed down in part by weak Financials metrics. (Here’s why Financials matter.)

The bottom line? Apollo is still a powerful franchise, but right now, the macro backdrop for alternative assets looks much tougher, and the stock may need stronger earnings momentum before investors regain confidence.

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