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ISRG vs MRK

A side-by-side look at ISRG and MRK, updated throughout the trading session.

Performance, normalized

Z-scored closes: both paths on one scale, price levels aside.

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ISRG vs MRK: how they differ

Intuitive Surgical, Inc. (ISRG) and Merck & Co., Inc. (MRK) are both in the Healthcare sector: ISRG is classified in Medical - Instruments & Supplies, MRK in Drug Manufacturers - General. ISRG trades on NASDAQ and MRK on NYSE.

ISRG trades about 2.8 million shares a day on average, against 10.3 million for MRK. ISRG has the higher beta (1.46 against 0.22 for MRK), meaning it has historically moved more with the broad market. MRK paid $3.40 per share in dividends over the trailing twelve months; ISRG does not currently pay one.

Figures as of October 25, 2026.

The chart Z-score-normalizes each closing series, computing (close − mean) ÷ standard deviation over the window, so both paths share one scale regardless of price level, and correlation is computed on daily returns. Figures update throughout the trading session. Nothing on this page is financial advice.