Legal Insider Buying Surges in U.S. Large-Cap Stocks UNH PLUG CEO

Quantina Intelligence Research | Blog Post

Date: 15 June, 2025

Location: Quantina Intelligence Research Lab, London, United Kingdom

In the latest analysis by Quantina Intelligence, our system detected a series of significant legal insider stock purchases across major U.S. publicly traded companies. These transactions—filed through SEC Form 4—offer rare insights into the confidence levels of top executives.

Below, we highlight three notable cases in large and mid-cap U.S. equities, each representing different sectors but showing a common pattern: high-conviction buying by insiders.

Plug Power Inc. (Ticker: PLUG)

https://www.tradingview.com/chart/?symbol=NASDAQ%3APLUG

Sector: Clean Energy | Market Cap: Mid-Cap

Key Insider: Paul Middleton, Chief Financial Officer

Total Shares Purchased: 1,000,000

Transaction Value: ~$920,000

Average Purchase Price: Between $0.72 and $1.03

Date: May 16 & June 9, 2025

*Quantina Take:* Middleton’s first insider buy since joining Plug Power over a decade ago sends a powerful signal—especially after a steep price correction. This deep-dive commitment suggests long-term optimism for the company’s future in hydrogen energy and battery storage markets.

UnitedHealth Group Inc. (Ticker: UNH)

https://www.tradingview.com/chart/?symbol=NASDAQ%3APLUG

Sector: Healthcare | Market Cap: Large-Cap

Key Insiders:

Stephen Hemsley, CEO – $25 million in stock

John Rex, CFO – $5 million in stock

Average Buy Price: ~$288–291

Date: June 2025

*Quantina Take:* Multiple coordinated insider purchases by the newly appointed leadership sparked an immediate 8% rally in UNH stock. This pattern typically reflects strategic positioning ahead of positive financial or operational developments.

Goldman Sachs Group Inc. (Ticker: GS)

Sector: Financials | Market Cap: Large-Cap

Key Insider: John Hess, Board Member & CEO of Hess Corp

Shares Bought: 3,904

Purchase Value: ~$2 million

Buy Price: $511.68

Date: April 15, 2025

*Quantina Take:* As a new board member, Hess was not required to buy shares—but he did. This move often indicates personal conviction and alignment with shareholder interests, especially ahead of mid-year financial reporting.

Why Legal Insider Buying Matters

Legal insider trading—not to be confused with illegal non-public information trading—is a mandatory disclosure when directors or officers purchase or sell shares in their own company. At Quantina, we use this data as one of our core sentiment indicators, especially when:

✅ The purchase is substantial in size

✅ It comes after a price drop

✅ Multiple insiders are involved

✅ The executive hasn’t bought in years

Quantina Intelligence Guidance

As always, we remind investors: Past activity is not a guarantee of future results. However, patterns like these can serve as key entry signals, especially for medium- to long-term positioning. Combine them with technical indicators and macro trends for optimized trade setups.

Disclaimer

Quantina Intelligence is not a registered financial advisor. All content is for educational and informational purposes only. Please consult a licensed investment professional before making any trading decision. Past performance does not guarantee future results.