10 Fastest Growing Mid Cap Stocks to Buy Now

5. iRhythm Holdings, Inc. (NASDAQ:IRTC)

iRhythm Holdings, Inc. (NASDAQ:IRTC) is one of the fastest growing stocks.

TheFly reported on February 23 that Goldman Sachs reduced its price target on IRTC to $184 from $211 and maintained a Neutral rating on the stock.

On February 19, iRhythm Holdings, Inc. (NASDAQ:IRTC) published its results for the fourth quarter and the entire year of 2025. The company’s fourth-quarter revenue of $208.9 million was a 27.1% increase over the same period the previous year. With a net income of $5.6 million and a gross margin of 70.9%, it was IRTC’s first quarter of positive GAAP profitability. Adjusted EBITDA reached $34.3 million with a margin of 16.4%, a significant rise over the prior year.

According to the report, the total revenue for 2025 was $747.1 million, representing a 26.2% yearly rise. The gross margin increased to 70.6%, but the net loss dropped to $44.6 million from the previous year. For the first time in a full year, the company’s free cash flow was positive, generating $34.5 million. Growth, margin expansion, and prudent investment will remain top priorities for management as 2026 approaches. The company credited its success to novel care channels, international markets, and consistent demand across its core U.S. business.

iRhythm Holdings, Inc. (NASDAQ:IRTC) is a digital healthcare company focused on cardiac monitoring solutions. Its flagship Zio platform uses wearable biosensors and AI-driven analytics to detect arrhythmias, enabling physicians to diagnose heart conditions more efficiently and improve patient outcomes.