National Grid Transco PLC National Grid PLC (NEW) vs The Williams Companies Inc.
WatchlistNGG / WMBPrices through Oct 22, 2026
Why these are rivals: #2 and #3 by market value ($86B vs $83B) in Nasdaq's "Natural Gas Distribution" industry; SEC SIC 4922 / 4922 (same major group); #1 and #2 by market value ($86B vs $83B) with SEC SIC 4922 (Natural Gas Transmission).
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: 0.20 (needs >= 0.60)
- Mean reversion: ADF t-statistic of the spread: -1.77 (needs <= -2.873 (5% critical value))
Business leadership
Business size
Annual revenue reported to the SEC. Scale, not market share.
| Year | NGG | WMB | Larger |
|---|---|---|---|
| 2025 | - | $11.9B | - |
| 2024 | - | $10.5B | - |
| 2023 | - | $10.9B | - |
| 2022 | - | $11.0B | - |
| 2021 | - | $10.6B | - |
| 2020 | - | $7.7B | - |
Market value: NGG $83.0B, WMB $86.1B.
Stock leadership
Neither is clearly ahead
Measured against the pair's own last 252 trading days.
The gap is 0.12 standard deviations, close to the usual relationship. 1 lead switch in the last year.
| Price change | 3 mo | 6 mo | 12 mo |
|---|---|---|---|
| NGG | +0.4% | -5.0% | +8.2% |
| WMB | -4.6% | -1.4% | +13.3% |
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: 0.20 (needs >= 0.60)
- Fail
- Mean reversion: ADF t-statistic of the spread: -1.77 (needs <= -2.873 (5% critical value))
- Pass
- Speed: half-life of the spread, sessions: 21.19 (needs <= 63)
- Data
- Both stocks current
The twins over two years
Prices side by side, and the gap between them
NGG National Grid Transco PLC National Grid PLC (NEW) WMB The Williams Companies Inc.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: NGG relative to WMB, against the 252 sessions before each day. Above 0: NGG ahead; below 0: WMB ahead. Lines at +/-2 (idea) and +/-4 (stop).
Data table (504 sessions)
| Date | NGG index | WMB index | z | Ahead |
|---|---|---|---|---|
| 2026-10-22 | 121.53 | 134.89 | -0.12 | near the usual relationship |
| 2026-10-21 | 118.79 | 139.04 | -0.84 | WMB ahead |
| 2026-10-20 | 119.21 | 134.32 | -0.33 | near the usual relationship |
| 2026-10-19 | 116.25 | 134.42 | -0.69 | WMB ahead |
| 2026-10-16 | 119.44 | 136.13 | -0.49 | near the usual relationship |
| 2026-10-15 | 116.28 | 132.20 | -0.46 | near the usual relationship |
| 2026-10-14 | 115.46 | 139.04 | -1.25 | WMB ahead |
| 2026-10-13 | 115.04 | 142.42 | -1.64 | WMB ahead |
| 2026-10-12 | 113.41 | 141.65 | -1.78 | WMB ahead |
| 2026-10-09 | 112.47 | 138.79 | -1.63 | WMB ahead |
| 2026-10-08 | 113.40 | 138.16 | -1.46 | WMB ahead |
| 2026-10-07 | 111.93 | 136.48 | -1.48 | WMB ahead |
| 2026-10-06 | 113.01 | 138.25 | -1.54 | WMB ahead |
| 2026-10-05 | 111.79 | 135.24 | -1.39 | WMB ahead |
| 2026-10-02 | 111.94 | 134.72 | -1.33 | WMB ahead |
| 2026-10-01 | 110.78 | 132.20 | -1.21 | WMB ahead |
| 2026-09-30 | 111.50 | 129.81 | -0.86 | WMB ahead |
| 2026-09-29 | 110.21 | 131.07 | -1.17 | WMB ahead |
| 2026-09-28 | 110.65 | 131.74 | -1.19 | WMB ahead |
| 2026-09-25 | 111.01 | 132.28 | -1.20 | WMB ahead |
| 2026-09-24 | 110.63 | 134.80 | -1.53 | WMB ahead |
| 2026-09-23 | 110.66 | 135.81 | -1.65 | WMB ahead |
| 2026-09-22 | 113.03 | 135.56 | -1.33 | WMB ahead |
| 2026-09-21 | 112.76 | 136.84 | -1.51 | WMB ahead |
| 2026-09-18 | 112.94 | 137.61 | -1.58 | WMB ahead |
| 2026-09-17 | 114.12 | 137.15 | -1.39 | WMB ahead |
| 2026-09-16 | 111.81 | 135.41 | -1.52 | WMB ahead |
| 2026-09-15 | 110.19 | 136.80 | -1.90 | WMB ahead |
| 2026-09-14 | 110.24 | 137.41 | -1.99 | WMB ahead |
| 2026-09-11 | 113.03 | 139.13 | -1.82 | WMB ahead |
| 2026-09-10 | 112.32 | 139.08 | -1.93 | WMB ahead |
| 2026-09-09 | 113.65 | 143.53 | -2.26 | WMB ahead |
| 2026-09-08 | 114.79 | 144.82 | -2.28 | WMB ahead |
| 2026-09-04 | 114.88 | 141.62 | -1.94 | WMB ahead |
| 2026-09-03 | 114.96 | 141.42 | -1.93 | WMB ahead |
| 2026-09-02 | 114.78 | 143.54 | -2.22 | WMB ahead |
| 2026-09-01 | 116.40 | 143.68 | -2.04 | WMB ahead |
| 2026-08-31 | 116.41 | 143.33 | -2.02 | WMB ahead |
| 2026-08-28 | 116.69 | 140.81 | -1.72 | WMB ahead |
| 2026-08-27 | 116.81 | 141.69 | -1.82 | WMB ahead |
| 2026-08-26 | 118.43 | 142.11 | -1.67 | WMB ahead |
| 2026-08-25 | 119.37 | 135.75 | -0.80 | WMB ahead |
| 2026-08-24 | 118.26 | 135.54 | -0.93 | WMB ahead |
| 2026-08-21 | 117.29 | 134.63 | -0.96 | WMB ahead |
| 2026-08-20 | 118.56 | 136.90 | -1.07 | WMB ahead |
| 2026-08-19 | 118.62 | 139.88 | -1.43 | WMB ahead |
| 2026-08-18 | 120.81 | 143.49 | -1.56 | WMB ahead |
| 2026-08-17 | 119.54 | 140.28 | -1.37 | WMB ahead |
| 2026-08-14 | 119.19 | 143.62 | -1.83 | WMB ahead |
| 2026-08-13 | 119.41 | 139.50 | -1.32 | WMB ahead |
| 2026-08-12 | 118.65 | 140.76 | -1.60 | WMB ahead |
| 2026-08-11 | 118.04 | 138.10 | -1.37 | WMB ahead |
| 2026-08-10 | 116.88 | 137.22 | -1.45 | WMB ahead |
| 2026-08-07 | 118.94 | 134.45 | -0.81 | WMB ahead |
| 2026-08-06 | 118.25 | 137.05 | -1.24 | WMB ahead |
| 2026-08-05 | 118.03 | 137.15 | -1.30 | WMB ahead |
| 2026-08-04 | 118.26 | 136.57 | -1.20 | WMB ahead |
| 2026-08-03 | 117.44 | 134.51 | -1.06 | WMB ahead |
| 2026-07-31 | 117.60 | 136.63 | -1.31 | WMB ahead |
| 2026-07-30 | 118.22 | 135.43 | -1.08 | WMB ahead |
| 2026-07-29 | 116.00 | 133.94 | -1.23 | WMB ahead |
| 2026-07-28 | 118.91 | 134.00 | -0.81 | WMB ahead |
| 2026-07-27 | 119.43 | 135.20 | -0.90 | WMB ahead |
| 2026-07-24 | 121.03 | 141.33 | -1.44 | WMB ahead |
| 2026-07-23 | 121.13 | 143.72 | -1.74 | WMB ahead |
| 2026-07-22 | 123.34 | 142.27 | -1.26 | WMB ahead |
| 2026-07-21 | 120.66 | 140.11 | -1.38 | WMB ahead |
| 2026-07-20 | 121.24 | 141.63 | -1.50 | WMB ahead |
| 2026-07-17 | 123.51 | 140.15 | -1.00 | WMB ahead |
| 2026-07-16 | 121.34 | 142.72 | -1.65 | WMB ahead |
| 2026-07-15 | 121.93 | 142.06 | -1.49 | WMB ahead |
| 2026-07-14 | 122.66 | 145.11 | -1.78 | WMB ahead |
| 2026-07-13 | 122.47 | 142.21 | -1.46 | WMB ahead |
| 2026-07-10 | 121.46 | 143.28 | -1.76 | WMB ahead |
| 2026-07-09 | 121.06 | 144.10 | -1.94 | WMB ahead |
| 2026-07-08 | 122.84 | 143.75 | -1.65 | WMB ahead |
| 2026-07-07 | 122.22 | 143.39 | -1.71 | WMB ahead |
| 2026-07-06 | 121.46 | 139.08 | -1.28 | WMB ahead |
| 2026-07-02 | 121.84 | 139.69 | -1.31 | WMB ahead |
| 2026-07-01 | 117.91 | 138.98 | -1.84 | WMB ahead |
| 2026-06-30 | 121.87 | 141.98 | -1.63 | WMB ahead |
| 2026-06-29 | 123.18 | 143.35 | -1.62 | WMB ahead |
| 2026-06-26 | 122.07 | 148.82 | -2.53 | WMB ahead |
| 2026-06-25 | 122.68 | 148.07 | -2.38 | WMB ahead |
| 2026-06-24 | 121.81 | 144.90 | -2.13 | WMB ahead |
| 2026-06-23 | 119.96 | 144.75 | -2.43 | WMB ahead |
| 2026-06-22 | 119.07 | 143.14 | -2.39 | WMB ahead |
| 2026-06-18 | 116.82 | 139.65 | -2.32 | WMB ahead |
| 2026-06-17 | 118.65 | 136.08 | -1.50 | WMB ahead |
| 2026-06-16 | 121.00 | 136.52 | -1.18 | WMB ahead |
| 2026-06-15 | 119.96 | 136.54 | -1.37 | WMB ahead |
| 2026-06-12 | 120.35 | 137.66 | -1.48 | WMB ahead |
| 2026-06-11 | 119.88 | 136.78 | -1.44 | WMB ahead |
| 2026-06-10 | 118.21 | 138.01 | -1.92 | WMB ahead |
| 2026-06-09 | 119.24 | 136.73 | -1.56 | WMB ahead |
| 2026-06-08 | 117.90 | 136.73 | -1.81 | WMB ahead |
| 2026-06-05 | 120.38 | 137.43 | -1.49 | WMB ahead |
| 2026-06-04 | 119.68 | 138.33 | -1.76 | WMB ahead |
| 2026-06-03 | 117.99 | 136.86 | -1.85 | WMB ahead |
| 2026-06-02 | 118.59 | 136.19 | -1.65 | WMB ahead |
| 2026-06-01 | 117.65 | 133.77 | -1.45 | WMB ahead |
| 2026-05-29 | 119.90 | 136.34 | -1.46 | WMB ahead |
| 2026-05-28 | 124.79 | 139.67 | -1.13 | WMB ahead |
| 2026-05-27 | 126.16 | 142.04 | -1.27 | WMB ahead |
| 2026-05-26 | 128.94 | 145.80 | -1.37 | WMB ahead |
| 2026-05-22 | 127.37 | 149.87 | -2.25 | WMB ahead |
| 2026-05-21 | 127.09 | 148.05 | -2.06 | WMB ahead |
| 2026-05-20 | 124.59 | 148.74 | -2.64 | WMB ahead |
| 2026-05-19 | 123.75 | 151.64 | -3.29 | WMB ahead |
| 2026-05-18 | 123.29 | 148.38 | -2.94 | WMB ahead |
| 2026-05-15 | 118.59 | 148.43 | -3.95 | WMB ahead |
| 2026-05-14 | 128.57 | 148.38 | -2.06 | WMB ahead |
| 2026-05-13 | 127.91 | 144.60 | -1.59 | WMB ahead |
| 2026-05-12 | 128.29 | 142.72 | -1.22 | WMB ahead |
| 2026-05-11 | 128.18 | 141.67 | -1.07 | WMB ahead |
| 2026-05-08 | 127.78 | 137.43 | -0.43 | near the usual relationship |
| 2026-05-07 | 126.34 | 139.32 | -1.03 | WMB ahead |
| 2026-05-06 | 129.19 | 140.87 | -0.76 | WMB ahead |
| 2026-05-05 | 128.88 | 145.38 | -1.57 | WMB ahead |
| 2026-05-04 | 128.68 | 144.02 | -1.40 | WMB ahead |
| 2026-05-01 | 130.12 | 144.27 | -1.18 | WMB ahead |
| 2026-04-30 | 131.68 | 145.74 | -1.14 | WMB ahead |
| 2026-04-29 | 126.44 | 140.03 | -1.17 | WMB ahead |
| 2026-04-28 | 128.60 | 139.50 | -0.67 | WMB ahead |
| 2026-04-27 | 128.28 | 136.76 | -0.25 | near the usual relationship |
| 2026-04-24 | 128.56 | 137.85 | -0.39 | near the usual relationship |
| 2026-04-23 | 127.88 | 136.84 | -0.34 | near the usual relationship |
| 2026-04-22 | 125.88 | 135.79 | -0.54 | WMB ahead |
| 2026-04-21 | 123.93 | 134.51 | -0.70 | WMB ahead |
| 2026-04-20 | 126.50 | 135.43 | -0.37 | near the usual relationship |
| 2026-04-17 | 127.82 | 135.89 | -0.19 | near the usual relationship |
| 2026-04-16 | 128.71 | 135.33 | +0.07 | near the usual relationship |
| 2026-04-15 | 129.21 | 135.14 | +0.20 | near the usual relationship |
| 2026-04-14 | 130.81 | 136.44 | +0.27 | near the usual relationship |
| 2026-04-13 | 130.81 | 136.63 | +0.24 | near the usual relationship |
| 2026-04-10 | 132.78 | 138.92 | +0.21 | near the usual relationship |
| 2026-04-09 | 132.82 | 139.08 | +0.20 | near the usual relationship |
| 2026-04-08 | 132.29 | 139.44 | +0.04 | near the usual relationship |
| 2026-04-07 | 128.71 | 141.41 | -0.94 | WMB ahead |
| 2026-04-06 | 128.03 | 138.64 | -0.57 | WMB ahead |
| 2026-04-02 | 129.40 | 137.51 | -0.12 | near the usual relationship |
| 2026-04-01 | 127.71 | 137.18 | -0.36 | near the usual relationship |
| 2026-03-31 | 124.41 | 139.00 | -1.23 | WMB ahead |
| 2026-03-30 | 123.07 | 138.41 | -1.35 | WMB ahead |
| 2026-03-27 | 120.47 | 140.53 | -2.13 | WMB ahead |
| 2026-03-26 | 121.18 | 141.44 | -2.10 | WMB ahead |
| 2026-03-25 | 123.96 | 140.97 | -1.50 | WMB ahead |
| 2026-03-24 | 121.07 | 142.21 | -2.16 | WMB ahead |
| 2026-03-23 | 120.68 | 140.57 | -1.97 | WMB ahead |
| 2026-03-20 | 120.57 | 138.29 | -1.63 | WMB ahead |
| 2026-03-19 | 125.78 | 141.44 | -1.21 | WMB ahead |
| 2026-03-18 | 128.53 | 139.04 | -0.41 | near the usual relationship |
| 2026-03-17 | 132.97 | 140.74 | +0.04 | near the usual relationship |
| 2026-03-16 | 133.66 | 141.12 | +0.09 | near the usual relationship |
| 2026-03-13 | 133.68 | 140.07 | +0.25 | near the usual relationship |
| 2026-03-12 | 133.54 | 140.41 | +0.19 | near the usual relationship |
| 2026-03-11 | 131.90 | 142.09 | -0.28 | near the usual relationship |
| 2026-03-10 | 132.13 | 141.02 | -0.09 | near the usual relationship |
| 2026-03-09 | 132.96 | 139.76 | +0.21 | near the usual relationship |
| 2026-03-06 | 132.15 | 141.79 | -0.18 | near the usual relationship |
| 2026-03-05 | 131.97 | 142.80 | -0.33 | near the usual relationship |
| 2026-03-04 | 132.99 | 144.71 | -0.42 | near the usual relationship |
| 2026-03-03 | 133.44 | 144.92 | -0.37 | near the usual relationship |
| 2026-03-02 | 138.06 | 145.65 | +0.17 | near the usual relationship |
| 2026-02-27 | 137.90 | 142.70 | +0.53 | NGG ahead |
| 2026-02-26 | 137.82 | 142.80 | +0.51 | NGG ahead |
| 2026-02-25 | 138.13 | 141.27 | +0.76 | NGG ahead |
| 2026-02-24 | 135.85 | 140.37 | +0.58 | NGG ahead |
| 2026-02-23 | 134.47 | 139.38 | +0.53 | NGG ahead |
| 2026-02-20 | 132.76 | 139.38 | +0.31 | near the usual relationship |
| 2026-02-19 | 132.75 | 137.83 | +0.51 | NGG ahead |
| 2026-02-18 | 133.54 | 137.78 | +0.62 | NGG ahead |
| 2026-02-17 | 135.91 | 137.43 | +0.97 | NGG ahead |
| 2026-02-13 | 135.88 | 138.04 | +0.90 | NGG ahead |
| 2026-02-12 | 134.15 | 135.85 | +0.96 | NGG ahead |
| 2026-02-11 | 133.29 | 135.83 | +0.86 | NGG ahead |
| 2026-02-10 | 130.53 | 131.47 | +1.06 | NGG ahead |
| 2026-02-09 | 129.99 | 129.58 | +1.24 | NGG ahead |
| 2026-02-06 | 129.50 | 127.81 | +1.42 | NGG ahead |
| 2026-02-05 | 127.78 | 128.76 | +1.08 | NGG ahead |
| 2026-02-04 | 129.10 | 126.93 | +1.50 | NGG ahead |
| 2026-02-03 | 126.81 | 130.83 | +0.71 | NGG ahead |
| 2026-02-02 | 124.43 | 126.70 | +0.93 | NGG ahead |
| 2026-01-30 | 125.40 | 128.46 | +0.84 | NGG ahead |
| 2026-01-29 | 125.10 | 128.42 | +0.81 | NGG ahead |
| 2026-01-28 | 124.53 | 127.81 | +0.82 | NGG ahead |
| 2026-01-27 | 123.99 | 125.06 | +1.11 | NGG ahead |
| 2026-01-26 | 121.44 | 122.78 | +1.07 | NGG ahead |
| 2026-01-23 | 119.85 | 124.06 | +0.70 | NGG ahead |
| 2026-01-22 | 117.91 | 121.70 | +0.75 | NGG ahead |
| 2026-01-21 | 118.90 | 120.66 | +1.01 | NGG ahead |
| 2026-01-20 | 117.65 | 117.48 | +1.26 | NGG ahead |
| 2026-01-16 | 118.96 | 117.55 | +1.42 | NGG ahead |
| 2026-01-15 | 116.71 | 115.15 | +1.44 | NGG ahead |
| 2026-01-14 | 116.00 | 115.95 | +1.25 | NGG ahead |
| 2026-01-13 | 114.82 | 115.53 | +1.16 | NGG ahead |
| 2026-01-12 | 117.29 | 113.75 | +1.70 | NGG ahead |
| 2026-01-09 | 117.82 | 115.20 | +1.60 | NGG ahead |
| 2026-01-08 | 116.88 | 116.79 | +1.29 | NGG ahead |
| 2026-01-07 | 116.75 | 115.34 | +1.47 | NGG ahead |
| 2026-01-06 | 117.04 | 113.64 | +1.73 | NGG ahead |
| 2026-01-05 | 115.09 | 116.81 | +1.10 | NGG ahead |
| 2026-01-02 | 115.74 | 116.21 | +1.27 | NGG ahead |
| 2025-12-31 | 113.75 | 114.80 | +1.20 | NGG ahead |
| 2025-12-30 | 114.37 | 114.90 | +1.28 | NGG ahead |
| 2025-12-29 | 113.90 | 114.21 | +1.32 | NGG ahead |
| 2025-12-26 | 114.18 | 113.67 | +1.43 | NGG ahead |
| 2025-12-24 | 113.96 | 113.56 | +1.43 | NGG ahead |
| 2025-12-23 | 113.59 | 114.11 | +1.32 | NGG ahead |
| 2025-12-22 | 112.37 | 112.53 | +1.38 | NGG ahead |
| 2025-12-19 | 111.93 | 111.27 | +1.50 | NGG ahead |
| 2025-12-18 | 112.34 | 112.03 | +1.47 | NGG ahead |
| 2025-12-17 | 113.47 | 112.38 | +1.59 | NGG ahead |
| 2025-12-16 | 111.43 | 111.55 | +1.44 | NGG ahead |
| 2025-12-15 | 111.81 | 113.60 | +1.23 | NGG ahead |
| 2025-12-12 | 110.19 | 114.09 | +0.96 | NGG ahead |
| 2025-12-11 | 109.84 | 116.35 | +0.64 | NGG ahead |
| 2025-12-10 | 109.76 | 115.55 | +0.73 | NGG ahead |
| 2025-12-09 | 110.13 | 117.55 | +0.54 | NGG ahead |
| 2025-12-08 | 110.78 | 118.32 | +0.53 | NGG ahead |
| 2025-12-05 | 110.90 | 119.96 | +0.35 | near the usual relationship |
| 2025-12-04 | 111.63 | 121.58 | +0.26 | near the usual relationship |
| 2025-12-03 | 112.49 | 117.55 | +0.86 | NGG ahead |
| 2025-12-02 | 111.24 | 114.99 | +1.03 | NGG ahead |
| 2025-12-01 | 111.25 | 117.34 | +0.74 | NGG ahead |
| 2025-11-28 | 111.93 | 116.37 | +0.96 | NGG ahead |
| 2025-11-26 | 111.04 | 115.01 | +1.02 | NGG ahead |
| 2025-11-25 | 108.93 | 113.39 | +0.96 | NGG ahead |
| 2025-11-24 | 108.15 | 113.50 | +0.85 | NGG ahead |
| 2025-11-21 | 110.57 | 113.85 | +1.13 | NGG ahead |
| 2025-11-20 | 111.51 | 112.51 | +1.44 | NGG ahead |
| 2025-11-19 | 111.90 | 112.47 | +1.50 | NGG ahead |
| 2025-11-18 | 114.01 | 113.01 | +1.73 | NGG ahead |
| 2025-11-17 | 114.62 | 114.42 | +1.64 | NGG ahead |
| 2025-11-14 | 113.79 | 116.48 | +1.28 | NGG ahead |
| 2025-11-13 | 114.84 | 113.81 | +1.77 | NGG ahead |
| 2025-11-12 | 114.75 | 115.41 | +1.57 | NGG ahead |
| 2025-11-11 | 113.69 | 115.74 | +1.40 | NGG ahead |
| 2025-11-10 | 113.72 | 115.74 | +1.42 | NGG ahead |
| 2025-11-07 | 114.34 | 113.79 | +1.76 | NGG ahead |
| 2025-11-06 | 112.19 | 110.66 | +1.91 | NGG ahead |
| 2025-11-05 | 110.84 | 109.89 | +1.85 | NGG ahead |
| 2025-11-04 | 110.50 | 107.93 | +2.09 | NGG ahead |
| 2025-11-03 | 109.91 | 112.74 | +1.35 | NGG ahead |
| 2025-10-31 | 110.66 | 110.52 | +1.77 | NGG ahead |
| 2025-10-30 | 111.84 | 110.05 | +2.01 | NGG ahead |
| 2025-10-29 | 111.10 | 108.82 | +2.09 | NGG ahead |
| 2025-10-28 | 112.72 | 109.99 | +2.17 | NGG ahead |
| 2025-10-27 | 113.49 | 110.14 | +2.27 | NGG ahead |
| 2025-10-24 | 113.16 | 109.78 | +2.29 | NGG ahead |
| 2025-10-23 | 112.79 | 112.55 | +1.85 | NGG ahead |
| 2025-10-22 | 113.09 | 118.72 | +1.04 | NGG ahead |
| 2025-10-21 | 112.34 | 119.06 | +0.88 | NGG ahead |
| 2025-10-20 | 112.66 | 120.44 | +0.74 | NGG ahead |
| 2025-10-17 | 113.16 | 119.29 | +0.94 | NGG ahead |
| 2025-10-16 | 111.62 | 119.42 | +0.70 | NGG ahead |
| 2025-10-15 | 110.34 | 121.81 | +0.22 | near the usual relationship |
| 2025-10-14 | 109.19 | 119.10 | +0.39 | near the usual relationship |
| 2025-10-13 | 107.79 | 119.71 | +0.11 | near the usual relationship |
| 2025-10-10 | 109.59 | 119.58 | +0.36 | near the usual relationship |
| 2025-10-09 | 107.84 | 120.51 | +0.00 | near the usual relationship |
| 2025-10-08 | 108.25 | 121.28 | -0.04 | near the usual relationship |
| 2025-10-07 | 108.65 | 122.17 | -0.11 | near the usual relationship |
| 2025-10-06 | 108.68 | 121.43 | -0.03 | near the usual relationship |
| 2025-10-03 | 107.99 | 123.15 | -0.32 | near the usual relationship |
| 2025-10-02 | 106.66 | 122.35 | -0.41 | near the usual relationship |
| 2025-10-01 | 107.15 | 121.64 | -0.28 | near the usual relationship |
| 2025-09-30 | 106.87 | 120.99 | -0.25 | near the usual relationship |
| 2025-09-29 | 105.59 | 122.17 | -0.53 | WMB ahead |
| 2025-09-26 | 105.22 | 122.25 | -0.59 | WMB ahead |
| 2025-09-25 | 103.71 | 120.91 | -0.63 | WMB ahead |
| 2025-09-24 | 104.63 | 120.05 | -0.45 | near the usual relationship |
| 2025-09-23 | 104.94 | 117.25 | -0.15 | near the usual relationship |
| 2025-09-22 | 104.35 | 114.90 | +0.01 | near the usual relationship |
| 2025-09-19 | 103.07 | 114.80 | -0.13 | near the usual relationship |
| 2025-09-18 | 102.93 | 115.32 | -0.20 | near the usual relationship |
| 2025-09-17 | 104.63 | 112.72 | +0.21 | near the usual relationship |
| 2025-09-16 | 104.24 | 110.68 | +0.35 | near the usual relationship |
| 2025-09-15 | 105.32 | 111.54 | +0.36 | near the usual relationship |
| 2025-09-12 | 105.29 | 112.32 | +0.27 | near the usual relationship |
| 2025-09-11 | 104.51 | 113.31 | +0.09 | near the usual relationship |
| 2025-09-10 | 103.94 | 112.22 | +0.12 | near the usual relationship |
| 2025-09-09 | 103.47 | 109.95 | +0.27 | near the usual relationship |
| 2025-09-08 | 103.56 | 108.58 | +0.39 | near the usual relationship |
| 2025-09-05 | 103.09 | 109.24 | +0.28 | near the usual relationship |
| 2025-09-04 | 101.35 | 109.97 | +0.04 | near the usual relationship |
| 2025-09-03 | 100.84 | 110.26 | -0.04 | near the usual relationship |
| 2025-09-02 | 99.97 | 109.59 | -0.07 | near the usual relationship |
| 2025-08-29 | 103.78 | 110.54 | +0.19 | near the usual relationship |
| 2025-08-28 | 104.19 | 110.77 | +0.20 | near the usual relationship |
| 2025-08-27 | 105.49 | 109.80 | +0.39 | near the usual relationship |
| 2025-08-26 | 104.47 | 109.11 | +0.35 | near the usual relationship |
| 2025-08-25 | 103.66 | 108.54 | +0.32 | near the usual relationship |
| 2025-08-22 | 105.01 | 109.00 | +0.39 | near the usual relationship |
| 2025-08-21 | 105.04 | 110.39 | +0.27 | near the usual relationship |
| 2025-08-20 | 106.00 | 109.28 | +0.44 | near the usual relationship |
| 2025-08-19 | 104.38 | 108.04 | +0.39 | near the usual relationship |
| 2025-08-18 | 103.97 | 107.94 | +0.36 | near the usual relationship |
| 2025-08-15 | 105.04 | 109.74 | +0.29 | near the usual relationship |
| 2025-08-14 | 105.24 | 109.51 | +0.32 | near the usual relationship |
| 2025-08-13 | 103.72 | 110.50 | +0.11 | near the usual relationship |
| 2025-08-12 | 103.35 | 110.31 | +0.09 | near the usual relationship |
| 2025-08-11 | 104.75 | 110.89 | +0.15 | near the usual relationship |
| 2025-08-08 | 104.43 | 110.56 | +0.14 | near the usual relationship |
| 2025-08-07 | 106.00 | 110.56 | +0.26 | near the usual relationship |
| 2025-08-06 | 106.32 | 111.99 | +0.17 | near the usual relationship |
| 2025-08-05 | 106.29 | 112.68 | +0.11 | near the usual relationship |
| 2025-08-04 | 106.84 | 115.09 | -0.03 | near the usual relationship |
| 2025-08-01 | 105.62 | 115.11 | -0.14 | near the usual relationship |
| 2025-07-31 | 103.51 | 114.50 | -0.27 | near the usual relationship |
| 2025-07-30 | 103.22 | 113.14 | -0.20 | near the usual relationship |
| 2025-07-29 | 103.71 | 112.47 | -0.12 | near the usual relationship |
| 2025-07-28 | 103.41 | 109.84 | +0.05 | near the usual relationship |
| 2025-07-25 | 106.10 | 110.43 | +0.21 | near the usual relationship |
| 2025-07-24 | 106.22 | 112.20 | +0.08 | near the usual relationship |
| 2025-07-23 | 106.84 | 110.22 | +0.27 | near the usual relationship |
| 2025-07-22 | 109.24 | 109.55 | +0.49 | near the usual relationship |
| 2025-07-21 | 106.66 | 110.16 | +0.25 | near the usual relationship |
| 2025-07-18 | 105.25 | 113.35 | -0.09 | near the usual relationship |
| 2025-07-17 | 104.66 | 110.94 | +0.03 | near the usual relationship |
| 2025-07-16 | 104.24 | 111.69 | -0.06 | near the usual relationship |
| 2025-07-15 | 104.41 | 111.48 | -0.04 | near the usual relationship |
| 2025-07-14 | 104.59 | 112.76 | -0.12 | near the usual relationship |
| 2025-07-11 | 103.22 | 111.19 | -0.12 | near the usual relationship |
| 2025-07-10 | 103.90 | 110.35 | -0.01 | near the usual relationship |
| 2025-07-09 | 104.19 | 110.49 | +0.00 | near the usual relationship |
| 2025-07-08 | 103.75 | 110.18 | -0.02 | near the usual relationship |
| 2025-07-07 | 104.32 | 111.69 | -0.08 | near the usual relationship |
| 2025-07-03 | 105.43 | 111.99 | -0.03 | near the usual relationship |
| 2025-07-02 | 103.84 | 112.95 | -0.21 | near the usual relationship |
| 2025-07-01 | 109.38 | 112.15 | +0.24 | near the usual relationship |
| 2025-06-30 | 109.43 | 119.96 | -0.28 | near the usual relationship |
| 2025-06-27 | 108.12 | 119.69 | -0.36 | near the usual relationship |
| 2025-06-26 | 109.31 | 120.07 | -0.30 | near the usual relationship |
| 2025-06-25 | 107.69 | 115.91 | -0.15 | near the usual relationship |
| 2025-06-24 | 107.72 | 116.73 | -0.20 | near the usual relationship |
| 2025-06-23 | 107.84 | 115.51 | -0.12 | near the usual relationship |
| 2025-06-20 | 104.21 | 115.53 | -0.39 | near the usual relationship |
| 2025-06-18 | 104.44 | 112.91 | -0.20 | near the usual relationship |
| 2025-06-17 | 105.37 | 111.73 | -0.05 | near the usual relationship |
| 2025-06-16 | 105.00 | 112.97 | -0.17 | near the usual relationship |
| 2025-06-13 | 106.93 | 114.17 | -0.11 | near the usual relationship |
| 2025-06-12 | 107.09 | 114.74 | -0.14 | near the usual relationship |
| 2025-06-11 | 105.10 | 113.48 | -0.20 | near the usual relationship |
| 2025-06-10 | 104.72 | 112.61 | -0.18 | near the usual relationship |
| 2025-06-09 | 104.59 | 113.94 | -0.28 | near the usual relationship |
| 2025-06-06 | 103.97 | 115.66 | -0.44 | near the usual relationship |
| 2025-06-05 | 104.46 | 115.66 | -0.41 | near the usual relationship |
| 2025-06-04 | 104.49 | 114.82 | -0.36 | near the usual relationship |
| 2025-06-03 | 104.90 | 116.71 | -0.46 | near the usual relationship |
| 2025-06-02 | 105.74 | 117.02 | -0.43 | near the usual relationship |
| 2025-05-30 | 104.99 | 115.57 | -0.39 | near the usual relationship |
| 2025-05-29 | 106.72 | 115.11 | -0.24 | near the usual relationship |
| 2025-05-28 | 106.87 | 115.78 | -0.28 | near the usual relationship |
| 2025-05-27 | 109.85 | 114.78 | -0.02 | near the usual relationship |
| 2025-05-23 | 109.99 | 112.66 | +0.11 | near the usual relationship |
| 2025-05-22 | 108.28 | 110.29 | +0.14 | near the usual relationship |
| 2025-05-21 | 108.19 | 110.64 | +0.10 | near the usual relationship |
| 2025-05-20 | 107.97 | 112.24 | -0.02 | near the usual relationship |
| 2025-05-19 | 106.51 | 111.80 | -0.10 | near the usual relationship |
| 2025-05-16 | 104.82 | 112.28 | -0.25 | near the usual relationship |
| 2025-05-15 | 102.99 | 112.24 | -0.37 | near the usual relationship |
| 2025-05-14 | 99.16 | 111.15 | -0.57 | WMB ahead |
| 2025-05-13 | 99.31 | 110.91 | -0.55 | WMB ahead |
| 2025-05-12 | 99.31 | 109.11 | -0.45 | near the usual relationship |
| 2025-05-09 | 103.96 | 110.12 | -0.22 | near the usual relationship |
| 2025-05-08 | 103.21 | 108.98 | -0.20 | near the usual relationship |
| 2025-05-07 | 106.72 | 112.57 | -0.20 | near the usual relationship |
| 2025-05-06 | 106.32 | 112.11 | -0.21 | near the usual relationship |
| 2025-05-05 | 105.65 | 114.92 | -0.41 | near the usual relationship |
| 2025-05-02 | 105.41 | 114.59 | -0.41 | near the usual relationship |
| 2025-05-01 | 105.37 | 112.30 | -0.30 | near the usual relationship |
| 2025-04-30 | 107.35 | 111.86 | -0.16 | near the usual relationship |
| 2025-04-29 | 107.41 | 113.96 | -0.28 | near the usual relationship |
| 2025-04-28 | 107.13 | 113.94 | -0.30 | near the usual relationship |
| 2025-04-25 | 105.94 | 112.74 | -0.31 | near the usual relationship |
| 2025-04-24 | 106.26 | 113.85 | -0.36 | near the usual relationship |
| 2025-04-23 | 105.46 | 111.69 | -0.30 | near the usual relationship |
| 2025-04-22 | 109.34 | 111.15 | -0.06 | near the usual relationship |
| 2025-04-21 | 107.21 | 107.79 | +0.00 | near the usual relationship |
| 2025-04-17 | 106.04 | 111.96 | -0.29 | near the usual relationship |
| 2025-04-16 | 105.12 | 111.27 | -0.32 | near the usual relationship |
| 2025-04-15 | 104.38 | 111.80 | -0.39 | near the usual relationship |
| 2025-04-14 | 102.04 | 109.55 | -0.41 | near the usual relationship |
| 2025-04-11 | 100.09 | 107.70 | -0.43 | near the usual relationship |
| 2025-04-10 | 96.46 | 105.18 | -0.51 | WMB ahead |
| 2025-04-09 | 95.90 | 107.75 | -0.69 | WMB ahead |
| 2025-04-08 | 92.26 | 103.76 | -0.70 | WMB ahead |
| 2025-04-07 | 92.50 | 104.76 | -0.75 | WMB ahead |
| 2025-04-04 | 96.96 | 104.22 | -0.46 | near the usual relationship |
| 2025-04-03 | 102.04 | 112.74 | -0.62 | WMB ahead |
| 2025-04-02 | 96.74 | 117.65 | -1.17 | WMB ahead |
| 2025-04-01 | 96.74 | 115.68 | -1.08 | WMB ahead |
| 2025-03-31 | 96.49 | 114.13 | -1.03 | WMB ahead |
| 2025-03-28 | 96.43 | 113.04 | -0.99 | WMB ahead |
| 2025-03-27 | 94.01 | 113.50 | -1.16 | WMB ahead |
| 2025-03-26 | 93.49 | 114.50 | -1.25 | WMB ahead |
| 2025-03-25 | 92.63 | 116.33 | -1.39 | WMB ahead |
| 2025-03-24 | 92.41 | 116.67 | -1.43 | WMB ahead |
| 2025-03-21 | 93.90 | 113.83 | -1.22 | WMB ahead |
| 2025-03-20 | 95.71 | 114.11 | -1.13 | WMB ahead |
| 2025-03-19 | 93.84 | 113.29 | -1.21 | WMB ahead |
| 2025-03-18 | 93.84 | 111.54 | -1.13 | WMB ahead |
| 2025-03-17 | 94.32 | 111.52 | -1.11 | WMB ahead |
| 2025-03-14 | 92.96 | 109.38 | -1.09 | WMB ahead |
| 2025-03-13 | 91.65 | 107.30 | -1.07 | WMB ahead |
| 2025-03-12 | 91.56 | 107.52 | -1.10 | WMB ahead |
| 2025-03-11 | 91.54 | 104.95 | -0.97 | WMB ahead |
| 2025-03-10 | 91.38 | 103.17 | -0.90 | WMB ahead |
| 2025-03-07 | 89.46 | 103.86 | -1.05 | WMB ahead |
| 2025-03-06 | 87.41 | 104.30 | -1.21 | WMB ahead |
| 2025-03-05 | 89.54 | 107.37 | -1.24 | WMB ahead |
| 2025-03-04 | 91.72 | 108.48 | -1.18 | WMB ahead |
| 2025-03-03 | 90.76 | 110.01 | -1.32 | WMB ahead |
| 2025-02-28 | 91.37 | 111.12 | -1.34 | WMB ahead |
| 2025-02-27 | 90.40 | 107.45 | -1.23 | WMB ahead |
| 2025-02-26 | 92.00 | 108.67 | -1.21 | WMB ahead |
| 2025-02-25 | 92.25 | 107.30 | -1.13 | WMB ahead |
| 2025-02-24 | 91.46 | 109.49 | -1.29 | WMB ahead |
| 2025-02-21 | 90.16 | 109.70 | -1.39 | WMB ahead |
| 2025-02-20 | 89.85 | 111.63 | -1.51 | WMB ahead |
| 2025-02-19 | 89.75 | 111.29 | -1.51 | WMB ahead |
| 2025-02-18 | 88.79 | 110.39 | -1.53 | WMB ahead |
| 2025-02-14 | 89.31 | 108.82 | -1.44 | WMB ahead |
| 2025-02-13 | 90.10 | 109.74 | -1.45 | WMB ahead |
| 2025-02-12 | 89.09 | 104.70 | -1.27 | WMB ahead |
| 2025-02-11 | 90.41 | 105.50 | -1.25 | WMB ahead |
| 2025-02-10 | 90.43 | 107.28 | -1.34 | WMB ahead |
| 2025-02-07 | 90.50 | 106.84 | -1.32 | WMB ahead |
| 2025-02-06 | 90.69 | 106.97 | -1.33 | WMB ahead |
| 2025-02-05 | 92.16 | 108.58 | -1.33 | WMB ahead |
| 2025-02-04 | 90.97 | 106.42 | -1.31 | WMB ahead |
| 2025-02-03 | 91.19 | 107.33 | -1.35 | WMB ahead |
| 2025-01-31 | 90.29 | 105.86 | -1.34 | WMB ahead |
| 2025-01-30 | 90.79 | 108.08 | -1.43 | WMB ahead |
| 2025-01-29 | 89.37 | 105.67 | -1.40 | WMB ahead |
| 2025-01-28 | 89.82 | 105.42 | -1.37 | WMB ahead |
| 2025-01-27 | 90.44 | 104.18 | -1.29 | WMB ahead |
| 2025-01-24 | 88.65 | 113.77 | -1.86 | WMB ahead |
| 2025-01-23 | 89.28 | 113.62 | -1.83 | WMB ahead |
| 2025-01-22 | 88.31 | 113.06 | -1.88 | WMB ahead |
| 2025-01-21 | 90.57 | 115.79 | -1.89 | WMB ahead |
| 2025-01-17 | 87.54 | 112.95 | -1.96 | WMB ahead |
| 2025-01-16 | 86.99 | 113.03 | -2.02 | WMB ahead |
| 2025-01-15 | 84.71 | 110.79 | -2.07 | WMB ahead |
| 2025-01-14 | 82.75 | 110.89 | -2.23 | WMB ahead |
| 2025-01-13 | 82.99 | 107.01 | -2.05 | WMB ahead |
| 2025-01-10 | 82.54 | 106.04 | -2.05 | WMB ahead |
| 2025-01-08 | 85.26 | 107.70 | -1.98 | WMB ahead |
| 2025-01-07 | 86.18 | 106.09 | -1.86 | WMB ahead |
| 2025-01-06 | 86.57 | 106.59 | -1.88 | WMB ahead |
| 2025-01-03 | 86.99 | 108.10 | -1.95 | WMB ahead |
| 2025-01-02 | 87.56 | 106.72 | -1.87 | WMB ahead |
| 2024-12-31 | 87.38 | 103.36 | -1.72 | WMB ahead |
| 2024-12-30 | 87.07 | 103.44 | -1.76 | WMB ahead |
| 2024-12-27 | 87.22 | 103.02 | -1.75 | WMB ahead |
| 2024-12-26 | 86.65 | 103.06 | -1.80 | WMB ahead |
| 2024-12-24 | 86.56 | 104.28 | -1.89 | WMB ahead |
| 2024-12-23 | 86.79 | 103.23 | -1.84 | WMB ahead |
| 2024-12-20 | 86.03 | 102.16 | -1.85 | WMB ahead |
| 2024-12-19 | 84.82 | 100.40 | -1.85 | WMB ahead |
| 2024-12-18 | 84.96 | 99.33 | -1.80 | WMB ahead |
| 2024-12-17 | 87.35 | 102.54 | -1.84 | WMB ahead |
| 2024-12-16 | 86.46 | 103.07 | -1.95 | WMB ahead |
| 2024-12-13 | 87.69 | 103.95 | -1.94 | WMB ahead |
| 2024-12-12 | 87.46 | 105.40 | -2.05 | WMB ahead |
| 2024-12-11 | 88.34 | 105.79 | -2.04 | WMB ahead |
| 2024-12-10 | 89.62 | 104.18 | -1.89 | WMB ahead |
| 2024-12-09 | 90.56 | 104.41 | -1.87 | WMB ahead |
| 2024-12-06 | 90.12 | 108.58 | -2.14 | WMB ahead |
| 2024-12-05 | 91.71 | 109.17 | -2.10 | WMB ahead |
| 2024-12-04 | 91.43 | 107.52 | -2.06 | WMB ahead |
| 2024-12-03 | 92.60 | 108.10 | -2.04 | WMB ahead |
| 2024-12-02 | 93.21 | 107.81 | -2.01 | WMB ahead |
| 2024-11-29 | 93.65 | 111.76 | -2.22 | WMB ahead |
| 2024-11-27 | 93.13 | 111.04 | -2.25 | WMB ahead |
| 2024-11-26 | 92.40 | 111.48 | -2.36 | WMB ahead |
| 2024-11-25 | 93.03 | 111.13 | -2.33 | WMB ahead |
| 2024-11-22 | 92.81 | 113.92 | -2.54 | WMB ahead |
| 2024-11-21 | 92.79 | 114.09 | -2.59 | WMB ahead |
| 2024-11-20 | 93.04 | 112.11 | -2.51 | WMB ahead |
| 2024-11-19 | 93.50 | 111.92 | -2.51 | WMB ahead |
| 2024-11-18 | 92.50 | 110.50 | -2.53 | WMB ahead |
| 2024-11-15 | 92.28 | 108.00 | -2.44 | WMB ahead |
| 2024-11-14 | 91.72 | 106.15 | -2.40 | WMB ahead |
| 2024-11-13 | 91.35 | 106.19 | -2.47 | WMB ahead |
| 2024-11-12 | 92.50 | 108.37 | -2.57 | WMB ahead |
| 2024-11-11 | 94.32 | 108.67 | -2.50 | WMB ahead |
| 2024-11-08 | 94.03 | 107.54 | -2.49 | WMB ahead |
| 2024-11-07 | 94.56 | 105.88 | -2.38 | WMB ahead |
| 2024-11-06 | 94.29 | 105.67 | -2.42 | WMB ahead |
| 2024-11-05 | 96.28 | 101.32 | -2.00 | WMB ahead |
| 2024-11-04 | 94.78 | 99.58 | -2.01 | WMB ahead |
| 2024-11-01 | 94.50 | 98.47 | -1.98 | WMB ahead |
| 2024-10-31 | 93.51 | 100.02 | -2.20 | WMB ahead |
| 2024-10-30 | 95.69 | 100.25 | -2.07 | WMB ahead |
| 2024-10-29 | 95.76 | 99.01 | -2.00 | WMB ahead |
| 2024-10-28 | 97.06 | 99.87 | -1.99 | WMB ahead |
| 2024-10-25 | 96.10 | 100.27 | -2.12 | WMB ahead |
| 2024-10-24 | 97.56 | 100.50 | -2.05 | WMB ahead |
| 2024-10-23 | 97.71 | 99.79 | -2.01 | WMB ahead |
| 2024-10-22 | 97.49 | 99.89 | -2.06 | WMB ahead |
| 2024-10-21 | 98.57 | 99.31 | -1.95 | WMB ahead |
| 2024-10-18 | 100.00 | 100.00 | -1.92 | WMB ahead |
One-day company-specific moves (4+ standard deviations, which block ideas for 10 sessions): Jan 27, 2025 (NGG +2.0%, WMB -8.4%); Apr 3, 2025 (NGG +5.5%, WMB -4.2%); May 15, 2026 (NGG -7.8%, WMB +0.0%). Upcoming earnings: WMB Nov 2, 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
NGG and WMB at a glance
NGG National Grid Transco PLC National Grid PLC (NEW)
- Listing
- NYSE · SEC CIK 1004315
- Industry
- Natural Gas Distribution · SIC 4922 Natural Gas Transmission
- Market value
- $83.0B
- Price history
- 2,521 daily closes, Oct 12, 2016 to Oct 22, 2026
WMB The Williams Companies Inc.
- Listing
- NYSE · SEC CIK 107263
- Industry
- Natural Gas Distribution · SIC 4922 Natural Gas Transmission
- Market value
- $86.1B
- 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 NGG and WMB
Follow the research behind the paper book
Boostio is a research-first platform in private beta: crypto candidates, daily market stories, public paper trading and now rival stocks. Exploring these pages stays free and open.
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.
