Intuitive Surgical Inc. vs STERIS plc (Ireland)
WatchlistISRG / STEPrices through Oct 22, 2026
Why these are rivals: #1 and #3 by market value ($153B vs $22B) in Nasdaq's "Industrial Specialties" industry; SEC SIC 3842 / 3842 (same major group); #1 and #3 by market value ($153B vs $22B) with SEC SIC 3842 (Orthopedic, Prosthetic & Surgical Appliances & Supplies).
Rivals, but right now the price gap does not have a measured habit of closing, so there is no paper idea, whatever the gap.
- Co-movement: daily return correlation, 252 sessions: 0.42 (needs >= 0.60)
- Mean reversion: ADF t-statistic of the spread: -1.70 (needs <= -2.873 (5% critical value))
Business leadership
ISRG is the larger business
Annual revenue reported to the SEC. Scale, not market share.
| Year | ISRG | STE | Larger |
|---|---|---|---|
| 2025 | $10.1B | $5.9B | ISRG |
| 2024 | $8.4B | $5.5B | ISRG |
| 2023 | $7.1B | $5.1B | ISRG |
| 2022 | $6.2B | $4.5B | ISRG |
| 2021 | $5.7B | $4.2B | ISRG |
| 2020 | $4.4B | $3.1B | ISRG |
ISRG led in every year with figures for both. Market value: ISRG $153.0B, STE $21.6B.
Stock leadership
STE is ahead now
Measured against the pair's own last 252 trading days.
STE leads ISRG by 0.34 standard deviations: +3.6% over its usual price ratio. 2 lead switches in the last year.
| Price change | 3 mo | 6 mo | 12 mo |
|---|---|---|---|
| ISRG | +31.5% | -7.3% | -4.1% |
| STE | +8.5% | +3.9% | -4.1% |
Relationship
Not a measured twin today
Only these tests can make a pair tradable on paper.
- Pass
- Aligned sessions: 2521 (needs >= 254)
- Fail
- Co-movement: daily return correlation, 252 sessions: 0.42 (needs >= 0.60)
- Fail
- Mean reversion: ADF t-statistic of the spread: -1.70 (needs <= -2.873 (5% critical value))
- Pass
- Speed: half-life of the spread, sessions: 30.69 (needs <= 63)
- Data
- Both stocks current
The twins over two years
Prices side by side, and the gap between them
ISRG Intuitive Surgical Inc. STE STERIS plc (Ireland)Price index, 100 = 2024-10-18. Tint = which stock is ahead of the pair's usual 1-year relationship (z beyond +/-0.5).
Spread z-score: ISRG relative to STE, against the 252 sessions before each day. Above 0: ISRG ahead; below 0: STE ahead. Lines at +/-2 (idea) and +/-4 (stop).
Data table (504 sessions)
| Date | ISRG index | STE index | z | Ahead |
|---|---|---|---|---|
| 2026-10-22 | 85.17 | 102.91 | -0.34 | near the usual relationship |
| 2026-10-21 | 82.15 | 98.15 | -0.23 | near the usual relationship |
| 2026-10-20 | 84.04 | 99.79 | -0.17 | near the usual relationship |
| 2026-10-19 | 83.12 | 98.37 | -0.14 | near the usual relationship |
| 2026-10-16 | 81.88 | 98.67 | -0.31 | near the usual relationship |
| 2026-10-15 | 82.10 | 99.42 | -0.35 | near the usual relationship |
| 2026-10-14 | 80.64 | 96.28 | -0.22 | near the usual relationship |
| 2026-10-13 | 80.99 | 96.51 | -0.20 | near the usual relationship |
| 2026-10-12 | 82.06 | 97.04 | -0.12 | near the usual relationship |
| 2026-10-09 | 81.35 | 95.01 | +0.00 | near the usual relationship |
| 2026-10-08 | 79.71 | 93.40 | -0.03 | near the usual relationship |
| 2026-10-07 | 79.54 | 92.92 | +0.00 | near the usual relationship |
| 2026-10-06 | 77.67 | 92.47 | -0.17 | near the usual relationship |
| 2026-10-05 | 78.00 | 93.54 | -0.24 | near the usual relationship |
| 2026-10-02 | 75.21 | 92.42 | -0.47 | near the usual relationship |
| 2026-10-01 | 76.99 | 92.77 | -0.28 | near the usual relationship |
| 2026-09-30 | 78.03 | 93.07 | -0.18 | near the usual relationship |
| 2026-09-29 | 79.09 | 93.35 | -0.08 | near the usual relationship |
| 2026-09-28 | 79.59 | 93.51 | -0.03 | near the usual relationship |
| 2026-09-25 | 77.75 | 92.59 | -0.16 | near the usual relationship |
| 2026-09-24 | 76.66 | 92.52 | -0.28 | near the usual relationship |
| 2026-09-23 | 76.43 | 93.06 | -0.36 | near the usual relationship |
| 2026-09-22 | 77.15 | 92.53 | -0.21 | near the usual relationship |
| 2026-09-21 | 77.07 | 91.72 | -0.14 | near the usual relationship |
| 2026-09-18 | 75.47 | 90.87 | -0.24 | near the usual relationship |
| 2026-09-17 | 73.59 | 92.20 | -0.61 | STE ahead |
| 2026-09-16 | 73.36 | 93.02 | -0.72 | STE ahead |
| 2026-09-15 | 72.37 | 93.19 | -0.86 | STE ahead |
| 2026-09-14 | 72.52 | 94.69 | -0.99 | STE ahead |
| 2026-09-11 | 70.83 | 93.40 | -1.09 | STE ahead |
| 2026-09-10 | 69.17 | 94.15 | -1.39 | STE ahead |
| 2026-09-09 | 67.78 | 95.32 | -1.71 | STE ahead |
| 2026-09-08 | 67.19 | 96.80 | -1.96 | STE ahead |
| 2026-09-04 | 70.36 | 99.53 | -1.80 | STE ahead |
| 2026-09-03 | 70.96 | 100.52 | -1.83 | STE ahead |
| 2026-09-02 | 71.36 | 102.08 | -1.94 | STE ahead |
| 2026-09-01 | 70.85 | 101.77 | -2.00 | STE ahead |
| 2026-08-31 | 72.31 | 103.10 | -1.95 | STE ahead |
| 2026-08-28 | 71.50 | 103.60 | -2.14 | STE ahead |
| 2026-08-27 | 70.43 | 103.24 | -2.28 | STE ahead |
| 2026-08-26 | 71.08 | 104.93 | -2.38 | STE ahead |
| 2026-08-25 | 71.35 | 104.78 | -2.36 | STE ahead |
| 2026-08-24 | 71.68 | 105.42 | -2.41 | STE ahead |
| 2026-08-21 | 72.69 | 105.44 | -2.30 | STE ahead |
| 2026-08-20 | 71.86 | 104.47 | -2.36 | STE ahead |
| 2026-08-19 | 76.32 | 104.99 | -1.80 | STE ahead |
| 2026-08-18 | 75.06 | 102.99 | -1.78 | STE ahead |
| 2026-08-17 | 74.90 | 101.82 | -1.70 | STE ahead |
| 2026-08-14 | 75.70 | 103.38 | -1.77 | STE ahead |
| 2026-08-13 | 77.00 | 104.62 | -1.73 | STE ahead |
| 2026-08-12 | 77.00 | 104.85 | -1.77 | STE ahead |
| 2026-08-11 | 76.99 | 105.58 | -1.86 | STE ahead |
| 2026-08-10 | 75.48 | 105.88 | -2.14 | STE ahead |
| 2026-08-07 | 72.69 | 105.24 | -2.53 | STE ahead |
| 2026-08-06 | 71.71 | 102.72 | -2.45 | STE ahead |
| 2026-08-05 | 71.99 | 103.13 | -2.49 | STE ahead |
| 2026-08-04 | 70.66 | 103.19 | -2.76 | STE ahead |
| 2026-08-03 | 72.03 | 103.10 | -2.57 | STE ahead |
| 2026-07-31 | 67.80 | 101.22 | -3.14 | STE ahead |
| 2026-07-30 | 67.73 | 102.46 | -3.38 | STE ahead |
| 2026-07-29 | 67.75 | 104.07 | -3.67 | STE ahead |
| 2026-07-28 | 69.42 | 102.08 | -3.20 | STE ahead |
| 2026-07-27 | 68.47 | 96.79 | -2.75 | STE ahead |
| 2026-07-24 | 64.76 | 94.87 | -3.29 | STE ahead |
| 2026-07-23 | 63.71 | 93.35 | -3.37 | STE ahead |
| 2026-07-22 | 65.37 | 93.32 | -3.07 | STE ahead |
| 2026-07-21 | 67.17 | 93.84 | -2.83 | STE ahead |
| 2026-07-20 | 67.77 | 95.05 | -2.93 | STE ahead |
| 2026-07-17 | 66.28 | 96.54 | -3.55 | STE ahead |
| 2026-07-16 | 77.20 | 98.00 | -1.62 | STE ahead |
| 2026-07-15 | 74.64 | 93.71 | -1.48 | STE ahead |
| 2026-07-14 | 72.82 | 92.50 | -1.66 | STE ahead |
| 2026-07-13 | 78.12 | 96.19 | -1.23 | STE ahead |
| 2026-07-10 | 78.05 | 95.72 | -1.18 | STE ahead |
| 2026-07-09 | 78.97 | 95.72 | -1.02 | STE ahead |
| 2026-07-08 | 79.65 | 92.84 | -0.48 | near the usual relationship |
| 2026-07-07 | 81.99 | 95.45 | -0.47 | near the usual relationship |
| 2026-07-06 | 83.05 | 94.52 | -0.16 | near the usual relationship |
| 2026-07-02 | 81.74 | 96.70 | -0.70 | STE ahead |
| 2026-07-01 | 77.21 | 94.08 | -1.12 | STE ahead |
| 2026-06-30 | 76.31 | 93.32 | -1.18 | STE ahead |
| 2026-06-29 | 77.90 | 94.50 | -1.07 | STE ahead |
| 2026-06-26 | 77.66 | 95.58 | -1.29 | STE ahead |
| 2026-06-25 | 76.69 | 93.33 | -1.14 | STE ahead |
| 2026-06-24 | 77.10 | 91.81 | -0.84 | STE ahead |
| 2026-06-23 | 77.36 | 90.06 | -0.53 | STE ahead |
| 2026-06-22 | 77.32 | 88.81 | -0.35 | near the usual relationship |
| 2026-06-18 | 78.05 | 89.79 | -0.37 | near the usual relationship |
| 2026-06-17 | 77.17 | 88.37 | -0.31 | near the usual relationship |
| 2026-06-16 | 80.03 | 91.52 | -0.30 | near the usual relationship |
| 2026-06-15 | 79.93 | 91.26 | -0.28 | near the usual relationship |
| 2026-06-12 | 78.88 | 91.98 | -0.58 | STE ahead |
| 2026-06-11 | 79.23 | 91.83 | -0.50 | STE ahead |
| 2026-06-10 | 79.06 | 92.22 | -0.59 | STE ahead |
| 2026-06-09 | 81.86 | 94.34 | -0.43 | near the usual relationship |
| 2026-06-08 | 80.32 | 93.08 | -0.51 | STE ahead |
| 2026-06-05 | 80.99 | 94.11 | -0.55 | STE ahead |
| 2026-06-04 | 80.36 | 94.06 | -0.66 | STE ahead |
| 2026-06-03 | 78.15 | 93.15 | -0.92 | STE ahead |
| 2026-06-02 | 77.19 | 92.96 | -1.06 | STE ahead |
| 2026-06-01 | 79.11 | 93.54 | -0.82 | STE ahead |
| 2026-05-29 | 81.48 | 94.27 | -0.53 | STE ahead |
| 2026-05-28 | 81.29 | 95.46 | -0.74 | STE ahead |
| 2026-05-27 | 80.31 | 94.34 | -0.75 | STE ahead |
| 2026-05-26 | 83.78 | 95.84 | -0.39 | near the usual relationship |
| 2026-05-22 | 84.06 | 95.98 | -0.37 | near the usual relationship |
| 2026-05-21 | 84.39 | 97.35 | -0.52 | STE ahead |
| 2026-05-20 | 86.16 | 95.71 | -0.01 | near the usual relationship |
| 2026-05-19 | 84.73 | 95.02 | -0.14 | near the usual relationship |
| 2026-05-18 | 84.41 | 94.34 | -0.10 | near the usual relationship |
| 2026-05-15 | 80.81 | 94.00 | -0.65 | STE ahead |
| 2026-05-14 | 82.14 | 95.71 | -0.67 | STE ahead |
| 2026-05-13 | 82.95 | 93.55 | -0.25 | near the usual relationship |
| 2026-05-12 | 82.87 | 93.44 | -0.25 | near the usual relationship |
| 2026-05-11 | 80.60 | 89.45 | -0.05 | near the usual relationship |
| 2026-05-08 | 86.36 | 91.93 | +0.48 | near the usual relationship |
| 2026-05-07 | 87.02 | 94.70 | +0.19 | near the usual relationship |
| 2026-05-06 | 86.68 | 95.04 | +0.09 | near the usual relationship |
| 2026-05-05 | 86.61 | 94.38 | +0.16 | near the usual relationship |
| 2026-05-04 | 86.80 | 94.06 | +0.22 | near the usual relationship |
| 2026-05-01 | 87.84 | 95.01 | +0.24 | near the usual relationship |
| 2026-04-30 | 87.81 | 96.11 | +0.09 | near the usual relationship |
| 2026-04-29 | 87.08 | 94.24 | +0.23 | near the usual relationship |
| 2026-04-28 | 89.54 | 97.39 | +0.16 | near the usual relationship |
| 2026-04-27 | 90.38 | 98.47 | +0.14 | near the usual relationship |
| 2026-04-24 | 92.53 | 98.29 | +0.45 | near the usual relationship |
| 2026-04-23 | 91.88 | 99.06 | +0.27 | near the usual relationship |
| 2026-04-22 | 92.80 | 99.07 | +0.39 | near the usual relationship |
| 2026-04-21 | 86.60 | 97.25 | -0.25 | near the usual relationship |
| 2026-04-20 | 89.34 | 100.34 | -0.25 | near the usual relationship |
| 2026-04-17 | 90.03 | 100.06 | -0.12 | near the usual relationship |
| 2026-04-16 | 87.90 | 97.48 | -0.10 | near the usual relationship |
| 2026-04-15 | 89.87 | 98.16 | +0.09 | near the usual relationship |
| 2026-04-14 | 89.65 | 99.64 | -0.13 | near the usual relationship |
| 2026-04-13 | 88.07 | 99.65 | -0.36 | near the usual relationship |
| 2026-04-10 | 86.47 | 98.64 | -0.46 | near the usual relationship |
| 2026-04-09 | 87.30 | 99.16 | -0.41 | near the usual relationship |
| 2026-04-08 | 88.70 | 99.73 | -0.29 | near the usual relationship |
| 2026-04-07 | 86.91 | 97.15 | -0.22 | near the usual relationship |
| 2026-04-06 | 86.84 | 97.48 | -0.28 | near the usual relationship |
| 2026-04-02 | 86.74 | 96.92 | -0.22 | near the usual relationship |
| 2026-04-01 | 89.12 | 97.47 | +0.04 | near the usual relationship |
| 2026-03-31 | 88.46 | 98.00 | -0.12 | near the usual relationship |
| 2026-03-30 | 86.88 | 97.22 | -0.25 | near the usual relationship |
| 2026-03-27 | 86.86 | 97.23 | -0.26 | near the usual relationship |
| 2026-03-26 | 89.91 | 99.02 | -0.06 | near the usual relationship |
| 2026-03-25 | 90.18 | 98.99 | -0.03 | near the usual relationship |
| 2026-03-24 | 90.55 | 98.26 | +0.11 | near the usual relationship |
| 2026-03-23 | 91.73 | 97.94 | +0.31 | near the usual relationship |
| 2026-03-20 | 91.71 | 97.51 | +0.36 | near the usual relationship |
| 2026-03-19 | 92.09 | 96.57 | +0.53 | ISRG ahead |
| 2026-03-18 | 91.67 | 95.82 | +0.57 | ISRG ahead |
| 2026-03-17 | 92.63 | 97.55 | +0.48 | near the usual relationship |
| 2026-03-16 | 92.77 | 97.08 | +0.56 | ISRG ahead |
| 2026-03-13 | 90.60 | 95.09 | +0.53 | ISRG ahead |
| 2026-03-12 | 91.96 | 94.11 | +0.84 | ISRG ahead |
| 2026-03-11 | 94.57 | 98.18 | +0.67 | ISRG ahead |
| 2026-03-10 | 93.23 | 98.42 | +0.46 | near the usual relationship |
| 2026-03-09 | 94.71 | 100.92 | +0.34 | near the usual relationship |
| 2026-03-06 | 94.05 | 102.15 | +0.10 | near the usual relationship |
| 2026-03-05 | 95.31 | 105.70 | -0.16 | near the usual relationship |
| 2026-03-04 | 96.17 | 107.72 | -0.29 | near the usual relationship |
| 2026-03-03 | 95.45 | 107.84 | -0.40 | near the usual relationship |
| 2026-03-02 | 95.22 | 109.80 | -0.64 | STE ahead |
| 2026-02-27 | 96.62 | 111.83 | -0.69 | STE ahead |
| 2026-02-26 | 97.26 | 112.87 | -0.73 | STE ahead |
| 2026-02-25 | 97.13 | 111.51 | -0.61 | STE ahead |
| 2026-02-24 | 94.79 | 109.35 | -0.67 | STE ahead |
| 2026-02-23 | 94.43 | 109.51 | -0.73 | STE ahead |
| 2026-02-20 | 96.72 | 111.08 | -0.63 | STE ahead |
| 2026-02-19 | 95.85 | 111.31 | -0.75 | STE ahead |
| 2026-02-18 | 96.09 | 110.50 | -0.65 | STE ahead |
| 2026-02-17 | 94.67 | 108.76 | -0.65 | STE ahead |
| 2026-02-13 | 93.22 | 110.06 | -0.94 | STE ahead |
| 2026-02-12 | 91.84 | 108.23 | -0.92 | STE ahead |
| 2026-02-11 | 95.20 | 107.90 | -0.53 | STE ahead |
| 2026-02-10 | 95.01 | 108.43 | -0.60 | STE ahead |
| 2026-02-09 | 94.57 | 108.75 | -0.69 | STE ahead |
| 2026-02-06 | 93.67 | 111.75 | -1.06 | STE ahead |
| 2026-02-05 | 91.40 | 108.05 | -0.98 | STE ahead |
| 2026-02-04 | 91.81 | 117.12 | -1.74 | STE ahead |
| 2026-02-03 | 91.89 | 115.96 | -1.65 | STE ahead |
| 2026-02-02 | 95.31 | 117.10 | -1.39 | STE ahead |
| 2026-01-30 | 96.75 | 116.37 | -1.19 | STE ahead |
| 2026-01-29 | 97.39 | 115.95 | -1.10 | STE ahead |
| 2026-01-28 | 100.17 | 115.60 | -0.80 | STE ahead |
| 2026-01-27 | 100.75 | 116.58 | -0.83 | STE ahead |
| 2026-01-26 | 101.47 | 116.61 | -0.77 | STE ahead |
| 2026-01-23 | 100.54 | 115.01 | -0.73 | STE ahead |
| 2026-01-22 | 100.89 | 115.62 | -0.75 | STE ahead |
| 2026-01-21 | 100.49 | 115.75 | -0.80 | STE ahead |
| 2026-01-20 | 101.21 | 114.33 | -0.63 | STE ahead |
| 2026-01-16 | 102.66 | 119.06 | -0.88 | STE ahead |
| 2026-01-15 | 103.87 | 118.88 | -0.76 | STE ahead |
| 2026-01-14 | 104.91 | 117.11 | -0.54 | STE ahead |
| 2026-01-13 | 107.80 | 115.17 | -0.15 | near the usual relationship |
| 2026-01-12 | 109.90 | 115.56 | -0.01 | near the usual relationship |
| 2026-01-09 | 112.49 | 113.81 | +0.33 | near the usual relationship |
| 2026-01-08 | 112.27 | 115.52 | +0.17 | near the usual relationship |
| 2026-01-07 | 113.65 | 114.87 | +0.32 | near the usual relationship |
| 2026-01-06 | 113.76 | 115.24 | +0.30 | near the usual relationship |
| 2026-01-05 | 108.68 | 113.78 | +0.00 | near the usual relationship |
| 2026-01-02 | 107.83 | 110.81 | +0.16 | near the usual relationship |
| 2025-12-31 | 108.68 | 112.35 | +0.10 | near the usual relationship |
| 2025-12-30 | 109.88 | 113.22 | +0.13 | near the usual relationship |
| 2025-12-29 | 110.41 | 113.55 | +0.14 | near the usual relationship |
| 2025-12-26 | 110.87 | 113.19 | +0.20 | near the usual relationship |
| 2025-12-24 | 110.75 | 113.31 | +0.17 | near the usual relationship |
| 2025-12-23 | 110.78 | 113.18 | +0.18 | near the usual relationship |
| 2025-12-22 | 111.26 | 113.06 | +0.22 | near the usual relationship |
| 2025-12-19 | 109.85 | 112.71 | +0.13 | near the usual relationship |
| 2025-12-18 | 107.82 | 111.48 | +0.06 | near the usual relationship |
| 2025-12-17 | 106.85 | 111.53 | -0.02 | near the usual relationship |
| 2025-12-16 | 106.41 | 112.13 | -0.11 | near the usual relationship |
| 2025-12-15 | 107.36 | 112.59 | -0.07 | near the usual relationship |
| 2025-12-12 | 104.06 | 111.58 | -0.26 | near the usual relationship |
| 2025-12-11 | 105.03 | 111.89 | -0.21 | near the usual relationship |
| 2025-12-10 | 106.67 | 114.71 | -0.30 | near the usual relationship |
| 2025-12-09 | 107.10 | 114.01 | -0.22 | near the usual relationship |
| 2025-12-08 | 108.78 | 115.85 | -0.22 | near the usual relationship |
| 2025-12-05 | 110.40 | 116.68 | -0.16 | near the usual relationship |
| 2025-12-04 | 109.11 | 115.67 | -0.19 | near the usual relationship |
| 2025-12-03 | 109.32 | 114.96 | -0.13 | near the usual relationship |
| 2025-12-02 | 108.94 | 114.91 | -0.16 | near the usual relationship |
| 2025-12-01 | 108.87 | 116.50 | -0.28 | near the usual relationship |
| 2025-11-28 | 110.04 | 118.01 | -0.31 | near the usual relationship |
| 2025-11-26 | 110.19 | 118.26 | -0.32 | near the usual relationship |
| 2025-11-25 | 111.08 | 118.67 | -0.28 | near the usual relationship |
| 2025-11-24 | 109.08 | 116.59 | -0.29 | near the usual relationship |
| 2025-11-21 | 107.76 | 116.68 | -0.40 | near the usual relationship |
| 2025-11-20 | 105.96 | 113.88 | -0.35 | near the usual relationship |
| 2025-11-19 | 108.35 | 112.88 | -0.09 | near the usual relationship |
| 2025-11-18 | 104.92 | 113.89 | -0.44 | near the usual relationship |
| 2025-11-17 | 104.90 | 113.90 | -0.44 | near the usual relationship |
| 2025-11-14 | 105.44 | 114.52 | -0.45 | near the usual relationship |
| 2025-11-13 | 108.51 | 115.42 | -0.28 | near the usual relationship |
| 2025-11-12 | 109.84 | 118.76 | -0.42 | near the usual relationship |
| 2025-11-11 | 109.79 | 118.19 | -0.39 | near the usual relationship |
| 2025-11-10 | 110.56 | 117.00 | -0.25 | near the usual relationship |
| 2025-11-07 | 107.45 | 116.89 | -0.47 | near the usual relationship |
| 2025-11-06 | 105.11 | 115.25 | -0.54 | STE ahead |
| 2025-11-05 | 105.26 | 107.77 | +0.02 | near the usual relationship |
| 2025-11-04 | 103.39 | 107.18 | -0.08 | near the usual relationship |
| 2025-11-03 | 104.42 | 105.17 | +0.15 | near the usual relationship |
| 2025-10-31 | 102.52 | 104.45 | +0.06 | near the usual relationship |
| 2025-10-30 | 101.70 | 104.67 | -0.03 | near the usual relationship |
| 2025-10-29 | 103.15 | 104.94 | +0.07 | near the usual relationship |
| 2025-10-28 | 104.65 | 106.89 | +0.04 | near the usual relationship |
| 2025-10-27 | 105.78 | 106.76 | +0.13 | near the usual relationship |
| 2025-10-24 | 104.87 | 106.70 | +0.07 | near the usual relationship |
| 2025-10-23 | 105.79 | 107.18 | +0.10 | near the usual relationship |
| 2025-10-22 | 101.13 | 107.41 | -0.29 | near the usual relationship |
| 2025-10-21 | 88.79 | 107.26 | -1.35 | STE ahead |
| 2025-10-20 | 87.97 | 107.34 | -1.44 | STE ahead |
| 2025-10-17 | 85.60 | 106.45 | -1.60 | STE ahead |
| 2025-10-16 | 83.40 | 106.49 | -1.84 | STE ahead |
| 2025-10-15 | 83.59 | 104.92 | -1.71 | STE ahead |
| 2025-10-14 | 83.74 | 105.39 | -1.75 | STE ahead |
| 2025-10-13 | 83.61 | 104.36 | -1.69 | STE ahead |
| 2025-10-10 | 82.43 | 104.51 | -1.84 | STE ahead |
| 2025-10-09 | 85.15 | 106.10 | -1.71 | STE ahead |
| 2025-10-08 | 85.98 | 107.39 | -1.74 | STE ahead |
| 2025-10-07 | 84.61 | 107.05 | -1.86 | STE ahead |
| 2025-10-06 | 86.29 | 106.64 | -1.67 | STE ahead |
| 2025-10-03 | 86.80 | 107.47 | -1.70 | STE ahead |
| 2025-10-02 | 85.01 | 107.42 | -1.89 | STE ahead |
| 2025-10-01 | 84.05 | 106.94 | -1.96 | STE ahead |
| 2025-09-30 | 85.82 | 109.66 | -2.02 | STE ahead |
| 2025-09-29 | 84.28 | 108.74 | -2.12 | STE ahead |
| 2025-09-26 | 84.64 | 110.38 | -2.24 | STE ahead |
| 2025-09-25 | 84.07 | 108.22 | -2.14 | STE ahead |
| 2025-09-24 | 85.19 | 109.01 | -2.11 | STE ahead |
| 2025-09-23 | 85.92 | 110.45 | -2.17 | STE ahead |
| 2025-09-22 | 85.30 | 110.66 | -2.28 | STE ahead |
| 2025-09-19 | 84.18 | 110.25 | -2.39 | STE ahead |
| 2025-09-18 | 83.63 | 111.01 | -2.55 | STE ahead |
| 2025-09-17 | 83.21 | 110.25 | -2.56 | STE ahead |
| 2025-09-16 | 83.37 | 109.90 | -2.54 | STE ahead |
| 2025-09-15 | 83.28 | 109.82 | -2.58 | STE ahead |
| 2025-09-12 | 86.29 | 110.74 | -2.33 | STE ahead |
| 2025-09-11 | 87.47 | 111.87 | -2.32 | STE ahead |
| 2025-09-10 | 86.34 | 108.06 | -2.11 | STE ahead |
| 2025-09-09 | 89.71 | 110.08 | -1.93 | STE ahead |
| 2025-09-08 | 90.19 | 110.05 | -1.88 | STE ahead |
| 2025-09-05 | 89.58 | 108.71 | -1.83 | STE ahead |
| 2025-09-04 | 87.21 | 107.86 | -2.04 | STE ahead |
| 2025-09-03 | 84.66 | 107.45 | -2.32 | STE ahead |
| 2025-09-02 | 90.01 | 107.25 | -1.69 | STE ahead |
| 2025-08-29 | 90.82 | 108.60 | -1.73 | STE ahead |
| 2025-08-28 | 90.92 | 108.47 | -1.72 | STE ahead |
| 2025-08-27 | 90.41 | 110.34 | -1.96 | STE ahead |
| 2025-08-26 | 91.00 | 110.16 | -1.89 | STE ahead |
| 2025-08-25 | 89.89 | 110.12 | -2.03 | STE ahead |
| 2025-08-22 | 91.37 | 111.62 | -2.02 | STE ahead |
| 2025-08-21 | 90.16 | 109.68 | -1.99 | STE ahead |
| 2025-08-20 | 92.19 | 110.59 | -1.85 | STE ahead |
| 2025-08-19 | 91.95 | 109.74 | -1.81 | STE ahead |
| 2025-08-18 | 92.35 | 108.38 | -1.64 | STE ahead |
| 2025-08-15 | 92.15 | 108.82 | -1.71 | STE ahead |
| 2025-08-14 | 91.54 | 109.08 | -1.81 | STE ahead |
| 2025-08-13 | 92.55 | 109.49 | -1.73 | STE ahead |
| 2025-08-12 | 91.76 | 108.03 | -1.68 | STE ahead |
| 2025-08-11 | 90.54 | 107.08 | -1.72 | STE ahead |
| 2025-08-08 | 90.20 | 107.62 | -1.81 | STE ahead |
| 2025-08-07 | 90.15 | 104.69 | -1.51 | STE ahead |
| 2025-08-06 | 90.96 | 98.03 | -0.71 | STE ahead |
| 2025-08-05 | 91.53 | 99.21 | -0.76 | STE ahead |
| 2025-08-04 | 92.75 | 101.23 | -0.82 | STE ahead |
| 2025-08-01 | 92.70 | 100.54 | -0.74 | STE ahead |
| 2025-07-31 | 92.31 | 100.37 | -0.76 | STE ahead |
| 2025-07-30 | 96.04 | 101.60 | -0.47 | near the usual relationship |
| 2025-07-29 | 95.34 | 101.21 | -0.50 | STE ahead |
| 2025-07-28 | 94.78 | 100.39 | -0.47 | near the usual relationship |
| 2025-07-25 | 95.15 | 102.13 | -0.60 | STE ahead |
| 2025-07-24 | 93.76 | 100.71 | -0.60 | STE ahead |
| 2025-07-23 | 96.32 | 99.92 | -0.25 | near the usual relationship |
| 2025-07-22 | 98.05 | 99.13 | +0.01 | near the usual relationship |
| 2025-07-21 | 99.03 | 98.67 | +0.16 | near the usual relationship |
| 2025-07-18 | 99.51 | 99.97 | +0.09 | near the usual relationship |
| 2025-07-17 | 99.04 | 99.53 | +0.09 | near the usual relationship |
| 2025-07-16 | 98.37 | 100.87 | -0.10 | near the usual relationship |
| 2025-07-15 | 98.29 | 101.41 | -0.15 | near the usual relationship |
| 2025-07-14 | 99.10 | 100.06 | +0.06 | near the usual relationship |
| 2025-07-11 | 98.26 | 101.05 | -0.12 | near the usual relationship |
| 2025-07-10 | 100.94 | 102.25 | +0.03 | near the usual relationship |
| 2025-07-09 | 101.34 | 102.50 | +0.05 | near the usual relationship |
| 2025-07-08 | 101.18 | 103.07 | -0.01 | near the usual relationship |
| 2025-07-07 | 102.60 | 103.40 | +0.10 | near the usual relationship |
| 2025-07-03 | 104.47 | 105.27 | +0.10 | near the usual relationship |
| 2025-07-02 | 103.73 | 105.58 | +0.01 | near the usual relationship |
| 2025-07-01 | 103.23 | 107.54 | -0.20 | near the usual relationship |
| 2025-06-30 | 104.27 | 106.46 | -0.01 | near the usual relationship |
| 2025-06-27 | 102.41 | 105.82 | -0.12 | near the usual relationship |
| 2025-06-26 | 102.50 | 105.71 | -0.10 | near the usual relationship |
| 2025-06-25 | 100.09 | 106.52 | -0.39 | near the usual relationship |
| 2025-06-24 | 100.37 | 106.18 | -0.32 | near the usual relationship |
| 2025-06-23 | 98.84 | 104.99 | -0.36 | near the usual relationship |
| 2025-06-20 | 97.74 | 104.44 | -0.41 | near the usual relationship |
| 2025-06-18 | 97.76 | 104.69 | -0.42 | near the usual relationship |
| 2025-06-17 | 98.27 | 105.07 | -0.40 | near the usual relationship |
| 2025-06-16 | 99.60 | 106.87 | -0.43 | near the usual relationship |
| 2025-06-13 | 98.28 | 106.95 | -0.55 | STE ahead |
| 2025-06-12 | 98.44 | 107.43 | -0.57 | STE ahead |
| 2025-06-11 | 100.24 | 106.69 | -0.33 | near the usual relationship |
| 2025-06-10 | 101.62 | 107.41 | -0.26 | near the usual relationship |
| 2025-06-09 | 100.96 | 107.56 | -0.33 | near the usual relationship |
| 2025-06-06 | 106.89 | 108.01 | +0.15 | near the usual relationship |
| 2025-06-05 | 107.08 | 107.95 | +0.18 | near the usual relationship |
| 2025-06-04 | 107.06 | 107.29 | +0.23 | near the usual relationship |
| 2025-06-03 | 105.89 | 107.84 | +0.10 | near the usual relationship |
| 2025-06-02 | 106.17 | 107.28 | +0.18 | near the usual relationship |
| 2025-05-30 | 105.98 | 108.67 | +0.06 | near the usual relationship |
| 2025-05-29 | 106.64 | 108.58 | +0.13 | near the usual relationship |
| 2025-05-28 | 106.00 | 108.58 | +0.08 | near the usual relationship |
| 2025-05-27 | 105.57 | 109.11 | +0.02 | near the usual relationship |
| 2025-05-23 | 103.53 | 107.69 | -0.03 | near the usual relationship |
| 2025-05-22 | 104.13 | 108.04 | +0.00 | near the usual relationship |
| 2025-05-21 | 104.97 | 109.16 | -0.01 | near the usual relationship |
| 2025-05-20 | 106.91 | 111.00 | +0.01 | near the usual relationship |
| 2025-05-19 | 107.77 | 111.92 | +0.02 | near the usual relationship |
| 2025-05-16 | 108.15 | 111.50 | +0.09 | near the usual relationship |
| 2025-05-15 | 107.51 | 109.41 | +0.20 | near the usual relationship |
| 2025-05-14 | 108.59 | 100.82 | +0.91 | ISRG ahead |
| 2025-05-13 | 108.21 | 102.44 | +0.77 | ISRG ahead |
| 2025-05-12 | 107.73 | 103.30 | +0.67 | ISRG ahead |
| 2025-05-09 | 102.95 | 100.35 | +0.56 | ISRG ahead |
| 2025-05-08 | 103.26 | 100.09 | +0.60 | ISRG ahead |
| 2025-05-07 | 102.88 | 99.72 | +0.61 | ISRG ahead |
| 2025-05-06 | 101.79 | 98.58 | +0.62 | ISRG ahead |
| 2025-05-05 | 102.05 | 99.40 | +0.58 | ISRG ahead |
| 2025-05-02 | 101.59 | 99.63 | +0.54 | ISRG ahead |
| 2025-05-01 | 99.24 | 98.49 | +0.46 | near the usual relationship |
| 2025-04-30 | 98.97 | 99.60 | +0.36 | near the usual relationship |
| 2025-04-29 | 98.80 | 99.29 | +0.38 | near the usual relationship |
| 2025-04-28 | 98.63 | 99.83 | +0.33 | near the usual relationship |
| 2025-04-25 | 98.74 | 99.71 | +0.35 | near the usual relationship |
| 2025-04-24 | 97.50 | 100.31 | +0.22 | near the usual relationship |
| 2025-04-23 | 93.63 | 99.21 | +0.01 | near the usual relationship |
| 2025-04-22 | 91.86 | 98.72 | -0.09 | near the usual relationship |
| 2025-04-21 | 89.86 | 96.96 | -0.11 | near the usual relationship |
| 2025-04-17 | 92.63 | 98.48 | +0.00 | near the usual relationship |
| 2025-04-16 | 92.36 | 97.50 | +0.05 | near the usual relationship |
| 2025-04-15 | 93.69 | 97.96 | +0.13 | near the usual relationship |
| 2025-04-14 | 94.05 | 99.27 | +0.06 | near the usual relationship |
| 2025-04-11 | 94.71 | 97.98 | +0.21 | near the usual relationship |
| 2025-04-10 | 93.93 | 96.22 | +0.29 | near the usual relationship |
| 2025-04-09 | 100.35 | 98.80 | +0.58 | ISRG ahead |
| 2025-04-08 | 87.81 | 92.42 | +0.10 | near the usual relationship |
| 2025-04-07 | 88.96 | 94.29 | +0.06 | near the usual relationship |
| 2025-04-04 | 86.65 | 94.22 | -0.12 | near the usual relationship |
| 2025-04-03 | 94.91 | 98.12 | +0.25 | near the usual relationship |
| 2025-04-02 | 97.29 | 100.85 | +0.23 | near the usual relationship |
| 2025-04-01 | 95.24 | 100.03 | +0.15 | near the usual relationship |
| 2025-03-31 | 95.03 | 100.44 | +0.11 | near the usual relationship |
| 2025-03-28 | 94.38 | 98.83 | +0.18 | near the usual relationship |
| 2025-03-27 | 97.46 | 99.37 | +0.37 | near the usual relationship |
| 2025-03-26 | 97.67 | 98.85 | +0.43 | near the usual relationship |
| 2025-03-25 | 99.74 | 98.28 | +0.62 | ISRG ahead |
| 2025-03-24 | 97.59 | 98.83 | +0.43 | near the usual relationship |
| 2025-03-21 | 94.50 | 97.68 | +0.30 | near the usual relationship |
| 2025-03-20 | 94.37 | 99.92 | +0.14 | near the usual relationship |
| 2025-03-19 | 94.42 | 99.83 | +0.16 | near the usual relationship |
| 2025-03-18 | 92.86 | 101.18 | -0.04 | near the usual relationship |
| 2025-03-17 | 93.79 | 100.96 | +0.05 | near the usual relationship |
| 2025-03-14 | 92.96 | 100.43 | +0.03 | near the usual relationship |
| 2025-03-13 | 91.49 | 98.58 | +0.06 | near the usual relationship |
| 2025-03-12 | 95.42 | 99.47 | +0.28 | near the usual relationship |
| 2025-03-11 | 94.74 | 101.07 | +0.14 | near the usual relationship |
| 2025-03-10 | 92.60 | 102.61 | -0.11 | near the usual relationship |
| 2025-03-07 | 99.45 | 103.14 | +0.33 | near the usual relationship |
| 2025-03-06 | 103.34 | 102.92 | +0.60 | ISRG ahead |
| 2025-03-05 | 108.99 | 100.79 | +1.08 | ISRG ahead |
| 2025-03-04 | 107.06 | 100.07 | +1.02 | ISRG ahead |
| 2025-03-03 | 108.79 | 98.70 | +1.22 | ISRG ahead |
| 2025-02-28 | 109.98 | 97.17 | +1.40 | ISRG ahead |
| 2025-02-27 | 108.18 | 97.53 | +1.28 | ISRG ahead |
| 2025-02-26 | 111.47 | 98.85 | +1.40 | ISRG ahead |
| 2025-02-25 | 110.09 | 99.18 | +1.31 | ISRG ahead |
| 2025-02-24 | 113.40 | 99.13 | +1.51 | ISRG ahead |
| 2025-02-21 | 113.55 | 97.74 | +1.62 | ISRG ahead |
| 2025-02-20 | 116.39 | 97.85 | +1.79 | ISRG ahead |
| 2025-02-19 | 116.76 | 98.11 | +1.81 | ISRG ahead |
| 2025-02-18 | 115.30 | 97.35 | +1.80 | ISRG ahead |
| 2025-02-14 | 114.28 | 97.20 | +1.77 | ISRG ahead |
| 2025-02-13 | 113.48 | 97.15 | +1.74 | ISRG ahead |
| 2025-02-12 | 113.14 | 97.10 | +1.74 | ISRG ahead |
| 2025-02-11 | 113.53 | 98.99 | +1.66 | ISRG ahead |
| 2025-02-10 | 114.30 | 99.41 | +1.69 | ISRG ahead |
| 2025-02-07 | 111.86 | 98.93 | +1.59 | ISRG ahead |
| 2025-02-06 | 112.92 | 99.91 | +1.61 | ISRG ahead |
| 2025-02-05 | 113.38 | 97.86 | +1.79 | ISRG ahead |
| 2025-02-04 | 111.23 | 97.23 | +1.72 | ISRG ahead |
| 2025-02-03 | 111.01 | 96.76 | +1.76 | ISRG ahead |
| 2025-01-31 | 109.73 | 97.78 | +1.63 | ISRG ahead |
| 2025-01-30 | 111.33 | 98.25 | +1.71 | ISRG ahead |
| 2025-01-29 | 109.89 | 97.62 | +1.68 | ISRG ahead |
| 2025-01-28 | 110.17 | 97.97 | +1.69 | ISRG ahead |
| 2025-01-27 | 110.04 | 98.30 | +1.68 | ISRG ahead |
| 2025-01-24 | 112.07 | 96.17 | +1.97 | ISRG ahead |
| 2025-01-23 | 116.79 | 96.26 | +2.27 | ISRG ahead |
| 2025-01-22 | 117.14 | 96.87 | +2.28 | ISRG ahead |
| 2025-01-21 | 115.92 | 96.20 | +2.29 | ISRG ahead |
| 2025-01-17 | 113.72 | 92.90 | +2.43 | ISRG ahead |
| 2025-01-16 | 112.08 | 93.13 | +2.34 | ISRG ahead |
| 2025-01-15 | 111.31 | 91.58 | +2.45 | ISRG ahead |
| 2025-01-14 | 103.40 | 91.99 | +1.91 | ISRG ahead |
| 2025-01-13 | 103.57 | 91.90 | +1.95 | ISRG ahead |
| 2025-01-10 | 105.05 | 91.18 | +2.13 | ISRG ahead |
| 2025-01-08 | 104.39 | 92.81 | +1.97 | ISRG ahead |
| 2025-01-07 | 102.06 | 91.51 | +1.92 | ISRG ahead |
| 2025-01-06 | 104.07 | 90.41 | +2.17 | ISRG ahead |
| 2025-01-03 | 102.71 | 90.46 | +2.09 | ISRG ahead |
| 2025-01-02 | 100.55 | 89.72 | +2.01 | ISRG ahead |
| 2024-12-31 | 100.16 | 91.10 | +1.89 | ISRG ahead |
| 2024-12-30 | 101.11 | 90.88 | +2.00 | ISRG ahead |
| 2024-12-27 | 102.63 | 92.17 | +2.02 | ISRG ahead |
| 2024-12-26 | 103.39 | 92.50 | +2.07 | ISRG ahead |
| 2024-12-24 | 103.05 | 92.48 | +2.07 | ISRG ahead |
| 2024-12-23 | 101.16 | 92.18 | +1.97 | ISRG ahead |
| 2024-12-20 | 100.63 | 91.95 | +1.97 | ISRG ahead |
| 2024-12-19 | 100.53 | 90.56 | +2.10 | ISRG ahead |
| 2024-12-18 | 101.02 | 91.74 | +2.06 | ISRG ahead |
| 2024-12-17 | 104.61 | 92.85 | +2.25 | ISRG ahead |
| 2024-12-16 | 104.00 | 93.52 | +2.18 | ISRG ahead |
| 2024-12-13 | 103.54 | 94.93 | +2.06 | ISRG ahead |
| 2024-12-12 | 104.52 | 95.91 | +2.08 | ISRG ahead |
| 2024-12-11 | 104.31 | 92.90 | +2.33 | ISRG ahead |
| 2024-12-10 | 103.25 | 94.93 | +2.11 | ISRG ahead |
| 2024-12-09 | 103.40 | 95.56 | +2.10 | ISRG ahead |
| 2024-12-06 | 105.61 | 95.67 | +2.28 | ISRG ahead |
| 2024-12-05 | 105.08 | 96.36 | +2.21 | ISRG ahead |
| 2024-12-04 | 105.53 | 96.28 | +2.28 | ISRG ahead |
| 2024-12-03 | 103.95 | 96.01 | +2.21 | ISRG ahead |
| 2024-12-02 | 104.16 | 96.99 | +2.17 | ISRG ahead |
| 2024-11-29 | 104.00 | 97.08 | +2.18 | ISRG ahead |
| 2024-11-27 | 103.34 | 96.37 | +2.21 | ISRG ahead |
| 2024-11-26 | 104.02 | 95.75 | +2.35 | ISRG ahead |
| 2024-11-25 | 102.96 | 95.78 | +2.29 | ISRG ahead |
| 2024-11-22 | 105.13 | 94.99 | +2.56 | ISRG ahead |
| 2024-11-21 | 105.65 | 95.62 | +2.59 | ISRG ahead |
| 2024-11-20 | 103.97 | 94.06 | +2.63 | ISRG ahead |
| 2024-11-19 | 103.39 | 93.95 | +2.63 | ISRG ahead |
| 2024-11-18 | 102.01 | 96.21 | +2.36 | ISRG ahead |
| 2024-11-15 | 101.24 | 97.55 | +2.20 | ISRG ahead |
| 2024-11-14 | 103.19 | 98.02 | +2.34 | ISRG ahead |
| 2024-11-13 | 102.98 | 98.50 | +2.30 | ISRG ahead |
| 2024-11-12 | 103.05 | 98.71 | +2.31 | ISRG ahead |
| 2024-11-11 | 102.80 | 98.32 | +2.33 | ISRG ahead |
| 2024-11-08 | 102.94 | 97.14 | +2.46 | ISRG ahead |
| 2024-11-07 | 100.60 | 95.50 | +2.42 | ISRG ahead |
| 2024-11-06 | 98.93 | 100.83 | +1.84 | ISRG ahead |
| 2024-11-05 | 98.85 | 100.79 | +1.83 | ISRG ahead |
| 2024-11-04 | 97.37 | 100.08 | +1.77 | ISRG ahead |
| 2024-11-01 | 97.16 | 99.79 | +1.78 | ISRG ahead |
| 2024-10-31 | 96.68 | 98.32 | +1.86 | ISRG ahead |
| 2024-10-30 | 98.58 | 99.44 | +1.93 | ISRG ahead |
| 2024-10-29 | 99.07 | 99.21 | +1.99 | ISRG ahead |
| 2024-10-28 | 98.03 | 99.27 | +1.90 | ISRG ahead |
| 2024-10-25 | 98.10 | 99.32 | +1.91 | ISRG ahead |
| 2024-10-24 | 98.17 | 100.70 | +1.81 | ISRG ahead |
| 2024-10-23 | 98.36 | 98.01 | +2.04 | ISRG ahead |
| 2024-10-22 | 99.30 | 98.18 | +2.11 | ISRG ahead |
| 2024-10-21 | 99.56 | 99.43 | +2.04 | ISRG ahead |
| 2024-10-18 | 100.00 | 100.00 | +2.04 | ISRG ahead |
One-day company-specific moves (4+ standard deviations, which block ideas for 10 sessions): Oct 18, 2024 (ISRG +10.0%, STE +0.3%); Nov 7, 2024 (ISRG +1.7%, STE -5.3%); Jan 15, 2025 (ISRG +7.7%, STE -0.4%); May 15, 2025 (ISRG -1.0%, STE +8.5%); Oct 22, 2025 (ISRG +13.9%, STE +0.1%); Jul 17, 2026 (ISRG -14.2%, STE -1.5%). Upcoming earnings: STE Nov 4, 2026 (after-hours).
Paired trades
The shared paper book and the replay, kept apart
Forward paper record
No paper position on this pair yet.
Historical simulation (a diagnostic, same rules)
No simulated trade through Oct 20, 2026: the pair rarely passed every test while 2 standard deviations apart.
Per $10,000 a leg. A replay on today's companies cannot prove an edge.
The companies
ISRG and STE at a glance
ISRG Intuitive Surgical Inc.
- Listing
- Nasdaq · SEC CIK 1035267
- Industry
- Industrial Specialties · SIC 3842 Orthopedic, Prosthetic & Surgical Appliances & Supplies
- Market value
- $153.0B
- Price history
- 2,521 daily closes, Oct 12, 2016 to Oct 22, 2026
STE STERIS plc (Ireland)
- Listing
- NYSE · SEC CIK 1757898
- Industry
- Industrial Specialties · SIC 3842 Orthopedic, Prosthetic & Surgical Appliances & Supplies
- Market value
- $21.6B
- Price history
- 2,521 daily closes, Oct 12, 2016 to Oct 22, 2026
Daily prices: Nasdaq.com. Filings and industry codes: SEC EDGAR. Earnings dates: Nasdaq earnings calendar.
Related
All pairs →Other rivals of ISRG and STE
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Explore the private betaPaper only: hypothetical paired positions with modelled costs. No broker, no orders, no real money. A historical simulation is a diagnostic, not proof of an edge. Not investment advice.
