Acadia Healthcare Company Inc. (ACHC): One of the Best Under-the-Radar Picks from David Einhorn

We just covered 15 Under-the-Radar Picks from David Einhorn That Are Quietly Dominating 2026 and Acadia Healthcare Company, Inc. (NASDAQ:ACHC) ranks 5th on this list.

Acadia Healthcare Company, Inc. (NASDAQ:ACHC) is a relatively recent addition to the 13F portfolio of Greenlight Capital. The fund first disclosed a stake in the company in the fourth quarter of 2024. This position comprised a little over 128,000 shares. In three of the next four quarters, the fund added to this position. Filings for the fourth quarter of 2025 show that the fund owned 4.1 million shares in the firm, up 150% compared to filings for the third quarter of 2025. The company provides behavioral healthcare services in the United States and Puerto Rico. It owns and operates acute inpatient psychiatric facilities, specialty treatment facilities comprising residential recovery facilities and eating disorder facilities, as well as comprehensive treatment centers and residential treatment centers.

Here is why Fastly (FSLY) is Among the 10 Best Edge Computing Stocks to Buy Right Now

Acadia Healthcare Company, Inc. (NASDAQ:ACHC) is currently the largest stand-alone behavioral healthcare provider in the US, a sector with high barriers to entry. In 2025, the firm added 1,089 beds through new openings and expansions. For 2026, management has committed to adding another 400 to 600 beds. Hedge funds view this physical moat as a primary driver for long-term organic growth. As occupancy increases across these new sites, the incremental revenue is expected to drop to the bottom line at high margins since the overhead is already covered.

While we acknowledge the risk and potential of ACHC as an investment, our conviction lies in the belief that some AI stocks hold greater promise for delivering higher returns and doing so within a shorter time frame. If you are looking for an AI stock that is more promising than ACHC and that has 10,000% upside potential, check out our report about this cheapest AI stock.

READ NEXT15 Safe Stocks to Invest In For Beginners and 10 Best Stocks to Buy According to Nancy Pelosi.

Disclosure: None. Follow Insider Monkey on Google News.