Automatic Data Processing Inc. vs Workday Inc.
WatchlistADP / WDAYPrices through Oct 22, 2026
Why these are rivals: #1 and #3 by market value ($114B vs $47B) in Nasdaq's "EDP Services" industry; SEC SIC 7374 / 7374 (same major group); #1 and #2 by market value ($114B vs $47B) with SEC SIC 7374 (Services-Computer Processing & Data Preparation).
Rivals, but right now the price gap does not have a measured habit of closing, so there is no paper idea, whatever the gap.
- Mean reversion: ADF t-statistic of the spread: -1.74 (needs <= -2.873 (5% critical value))
Business leadership
ADP is the larger business
Annual revenue reported to the SEC. Scale, not market share.
| Year | ADP | WDAY | Larger |
|---|---|---|---|
| 2025 | $20.6B | $9.6B | ADP |
| 2024 | $19.2B | $8.4B | ADP |
| 2023 | $18.0B | $7.3B | ADP |
| 2022 | $16.5B | $6.2B | ADP |
| 2021 | $15.0B | $5.1B | ADP |
| 2020 | $14.6B | $4.3B | ADP |
ADP led in every year with figures for both. Market value: ADP $113.7B, WDAY $47.0B.
Stock leadership
Neither is clearly ahead
Measured against the pair's own last 252 trading days.
The gap is 0.02 standard deviations, close to the usual relationship. 1 lead switch in the last year.
| Price change | 3 mo | 6 mo | 12 mo |
|---|---|---|---|
| ADP | +23.1% | +55.1% | +8.4% |
| WDAY | +55.2% | +83.1% | -14.5% |
Relationship
Not a measured twin today
Only these tests can make a pair tradable on paper.
- Pass
- Aligned sessions: 2521 (needs >= 254)
- Pass
- Co-movement: daily return correlation, 252 sessions: 0.63 (needs >= 0.60)
- Fail
- Mean reversion: ADF t-statistic of the spread: -1.74 (needs <= -2.873 (5% critical value))
- Pass
- Speed: half-life of the spread, sessions: 32.87 (needs <= 63)
- Data
- Both stocks current
The twins over two years
Prices side by side, and the gap between them
ADP Automatic Data Processing Inc. WDAY Workday 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: ADP relative to WDAY, against the 252 sessions before each day. Above 0: ADP ahead; below 0: WDAY ahead. Lines at +/-2 (idea) and +/-4 (stop).
Data table (504 sessions)
| Date | ADP index | WDAY index | z | Ahead |
|---|---|---|---|---|
| 2026-10-22 | 105.35 | 85.89 | +0.02 | near the usual relationship |
| 2026-10-21 | 100.76 | 83.02 | -0.05 | near the usual relationship |
| 2026-10-20 | 100.16 | 83.43 | -0.12 | near the usual relationship |
| 2026-10-19 | 98.20 | 79.84 | +0.05 | near the usual relationship |
| 2026-10-16 | 98.84 | 78.05 | +0.25 | near the usual relationship |
| 2026-10-15 | 97.73 | 80.43 | -0.02 | near the usual relationship |
| 2026-10-14 | 95.90 | 77.21 | +0.13 | near the usual relationship |
| 2026-10-13 | 94.39 | 76.09 | +0.13 | near the usual relationship |
| 2026-10-12 | 93.68 | 77.00 | +0.00 | near the usual relationship |
| 2026-10-09 | 92.68 | 76.32 | -0.01 | near the usual relationship |
| 2026-10-08 | 92.62 | 76.82 | -0.05 | near the usual relationship |
| 2026-10-07 | 90.32 | 75.37 | -0.08 | near the usual relationship |
| 2026-10-06 | 89.76 | 76.30 | -0.20 | near the usual relationship |
| 2026-10-05 | 89.04 | 77.29 | -0.33 | near the usual relationship |
| 2026-10-02 | 88.16 | 76.14 | -0.30 | near the usual relationship |
| 2026-10-01 | 90.31 | 76.39 | -0.16 | near the usual relationship |
| 2026-09-30 | 88.29 | 77.90 | -0.43 | near the usual relationship |
| 2026-09-29 | 89.57 | 77.38 | -0.29 | near the usual relationship |
| 2026-09-28 | 89.57 | 77.14 | -0.26 | near the usual relationship |
| 2026-09-25 | 90.21 | 77.49 | -0.24 | near the usual relationship |
| 2026-09-24 | 90.02 | 78.12 | -0.30 | near the usual relationship |
| 2026-09-23 | 90.21 | 78.69 | -0.33 | near the usual relationship |
| 2026-09-22 | 92.25 | 76.99 | -0.05 | near the usual relationship |
| 2026-09-21 | 92.35 | 78.50 | -0.16 | near the usual relationship |
| 2026-09-18 | 92.79 | 79.30 | -0.19 | near the usual relationship |
| 2026-09-17 | 93.14 | 81.51 | -0.34 | near the usual relationship |
| 2026-09-16 | 93.47 | 76.80 | +0.06 | near the usual relationship |
| 2026-09-15 | 94.61 | 77.99 | +0.05 | near the usual relationship |
| 2026-09-14 | 94.64 | 79.44 | -0.07 | near the usual relationship |
| 2026-09-11 | 91.78 | 75.96 | +0.02 | near the usual relationship |
| 2026-09-10 | 91.46 | 75.71 | +0.03 | near the usual relationship |
| 2026-09-09 | 90.74 | 76.10 | -0.05 | near the usual relationship |
| 2026-09-08 | 91.68 | 76.19 | +0.01 | near the usual relationship |
| 2026-09-04 | 94.98 | 80.08 | -0.08 | near the usual relationship |
| 2026-09-03 | 97.00 | 84.64 | -0.30 | near the usual relationship |
| 2026-09-02 | 96.19 | 82.16 | -0.16 | near the usual relationship |
| 2026-09-01 | 96.99 | 81.14 | -0.03 | near the usual relationship |
| 2026-08-31 | 97.90 | 80.76 | +0.06 | near the usual relationship |
| 2026-08-28 | 98.35 | 83.74 | -0.13 | near the usual relationship |
| 2026-08-27 | 97.40 | 79.18 | +0.16 | near the usual relationship |
| 2026-08-26 | 96.27 | 78.02 | +0.18 | near the usual relationship |
| 2026-08-25 | 96.75 | 79.52 | +0.09 | near the usual relationship |
| 2026-08-24 | 96.83 | 81.46 | -0.05 | near the usual relationship |
| 2026-08-21 | 96.07 | 81.81 | -0.13 | near the usual relationship |
| 2026-08-20 | 95.52 | 80.71 | -0.08 | near the usual relationship |
| 2026-08-19 | 94.84 | 81.16 | -0.15 | near the usual relationship |
| 2026-08-18 | 92.14 | 77.98 | -0.08 | near the usual relationship |
| 2026-08-17 | 91.03 | 78.20 | -0.18 | near the usual relationship |
| 2026-08-14 | 93.39 | 81.27 | -0.26 | near the usual relationship |
| 2026-08-13 | 94.51 | 84.44 | -0.42 | near the usual relationship |
| 2026-08-12 | 92.14 | 71.70 | +0.44 | near the usual relationship |
| 2026-08-11 | 92.75 | 74.15 | +0.28 | near the usual relationship |
| 2026-08-10 | 93.63 | 75.34 | +0.24 | near the usual relationship |
| 2026-08-07 | 92.83 | 73.48 | +0.34 | near the usual relationship |
| 2026-08-06 | 93.57 | 69.63 | +0.74 | ADP ahead |
| 2026-08-05 | 92.40 | 69.80 | +0.65 | ADP ahead |
| 2026-08-04 | 92.59 | 70.06 | +0.64 | ADP ahead |
| 2026-08-03 | 92.30 | 67.51 | +0.86 | ADP ahead |
| 2026-07-31 | 91.16 | 65.58 | +0.97 | ADP ahead |
| 2026-07-30 | 90.28 | 64.67 | +1.00 | ADP ahead |
| 2026-07-29 | 93.53 | 68.72 | +0.85 | ADP ahead |
| 2026-07-28 | 90.38 | 65.32 | +0.96 | ADP ahead |
| 2026-07-27 | 87.24 | 60.35 | +1.25 | ADP ahead |
| 2026-07-24 | 85.56 | 55.36 | +1.69 | ADP ahead |
| 2026-07-23 | 83.10 | 52.30 | +1.88 | ADP ahead |
| 2026-07-22 | 83.18 | 54.16 | +1.69 | ADP ahead |
| 2026-07-21 | 84.24 | 57.74 | +1.37 | ADP ahead |
| 2026-07-20 | 87.32 | 60.22 | +1.34 | ADP ahead |
| 2026-07-17 | 87.33 | 59.22 | +1.46 | ADP ahead |
| 2026-07-16 | 87.78 | 59.49 | +1.48 | ADP ahead |
| 2026-07-15 | 84.67 | 58.01 | +1.42 | ADP ahead |
| 2026-07-14 | 84.31 | 57.19 | +1.50 | ADP ahead |
| 2026-07-13 | 85.89 | 59.26 | +1.40 | ADP ahead |
| 2026-07-10 | 82.77 | 56.83 | +1.44 | ADP ahead |
| 2026-07-09 | 82.55 | 56.59 | +1.47 | ADP ahead |
| 2026-07-08 | 82.58 | 56.40 | +1.51 | ADP ahead |
| 2026-07-07 | 84.03 | 58.76 | +1.36 | ADP ahead |
| 2026-07-06 | 81.94 | 56.44 | +1.47 | ADP ahead |
| 2026-07-02 | 82.89 | 55.38 | +1.70 | ADP ahead |
| 2026-07-01 | 80.65 | 53.28 | +1.79 | ADP ahead |
| 2026-06-30 | 76.62 | 50.07 | +1.89 | ADP ahead |
| 2026-06-29 | 76.97 | 50.55 | +1.88 | ADP ahead |
| 2026-06-26 | 76.48 | 50.81 | +1.82 | ADP ahead |
| 2026-06-25 | 74.01 | 46.54 | +2.23 | ADP ahead |
| 2026-06-24 | 75.22 | 48.30 | +2.11 | ADP ahead |
| 2026-06-23 | 75.44 | 47.09 | +2.34 | ADP ahead |
| 2026-06-22 | 73.42 | 46.24 | +2.31 | ADP ahead |
| 2026-06-18 | 74.72 | 47.83 | +2.23 | ADP ahead |
| 2026-06-17 | 74.84 | 49.83 | +1.97 | ADP ahead |
| 2026-06-16 | 75.95 | 51.85 | +1.80 | ADP ahead |
| 2026-06-15 | 76.37 | 53.01 | +1.70 | ADP ahead |
| 2026-06-12 | 77.39 | 53.50 | +1.75 | ADP ahead |
| 2026-06-11 | 77.24 | 53.39 | +1.77 | ADP ahead |
| 2026-06-10 | 79.07 | 56.23 | +1.57 | ADP ahead |
| 2026-06-09 | 79.09 | 57.36 | +1.44 | ADP ahead |
| 2026-06-08 | 78.37 | 58.80 | +1.19 | ADP ahead |
| 2026-06-05 | 79.36 | 59.02 | +1.27 | ADP ahead |
| 2026-06-04 | 79.14 | 60.50 | +1.07 | ADP ahead |
| 2026-06-03 | 77.92 | 60.09 | +1.01 | ADP ahead |
| 2026-06-02 | 79.09 | 60.90 | +1.03 | ADP ahead |
| 2026-06-01 | 79.97 | 64.31 | +0.70 | ADP ahead |
| 2026-05-29 | 75.90 | 59.80 | +0.86 | ADP ahead |
| 2026-05-28 | 75.22 | 53.18 | +1.70 | ADP ahead |
| 2026-05-27 | 74.46 | 50.92 | +1.98 | ADP ahead |
| 2026-05-26 | 74.70 | 50.73 | +2.06 | ADP ahead |
| 2026-05-22 | 77.08 | 52.41 | +2.07 | ADP ahead |
| 2026-05-21 | 75.29 | 49.84 | +2.32 | ADP ahead |
| 2026-05-20 | 75.50 | 51.79 | +2.06 | ADP ahead |
| 2026-05-19 | 75.42 | 52.90 | +1.90 | ADP ahead |
| 2026-05-18 | 76.27 | 52.72 | +2.05 | ADP ahead |
| 2026-05-15 | 73.38 | 51.13 | +2.00 | ADP ahead |
| 2026-05-14 | 71.29 | 48.57 | +2.21 | ADP ahead |
| 2026-05-13 | 71.38 | 47.65 | +2.41 | ADP ahead |
| 2026-05-12 | 73.15 | 48.52 | +2.50 | ADP ahead |
| 2026-05-11 | 72.42 | 49.66 | +2.26 | ADP ahead |
| 2026-05-08 | 72.87 | 52.29 | +1.91 | ADP ahead |
| 2026-05-07 | 73.25 | 53.53 | +1.77 | ADP ahead |
| 2026-05-06 | 70.89 | 50.16 | +2.07 | ADP ahead |
| 2026-05-05 | 72.05 | 52.71 | +1.81 | ADP ahead |
| 2026-05-04 | 72.30 | 52.31 | +1.92 | ADP ahead |
| 2026-05-01 | 73.29 | 51.93 | +2.13 | ADP ahead |
| 2026-04-30 | 72.51 | 50.07 | +2.39 | ADP ahead |
| 2026-04-29 | 73.58 | 50.08 | +2.56 | ADP ahead |
| 2026-04-28 | 68.14 | 49.57 | +2.00 | ADP ahead |
| 2026-04-27 | 67.48 | 48.20 | +2.19 | ADP ahead |
| 2026-04-24 | 67.24 | 48.99 | +2.03 | ADP ahead |
| 2026-04-23 | 67.92 | 46.90 | +2.56 | ADP ahead |
| 2026-04-22 | 69.00 | 51.78 | +1.82 | ADP ahead |
| 2026-04-21 | 69.41 | 52.83 | +1.70 | ADP ahead |
| 2026-04-20 | 69.24 | 52.33 | +1.79 | ADP ahead |
| 2026-04-17 | 68.59 | 50.65 | +2.03 | ADP ahead |
| 2026-04-16 | 68.56 | 51.08 | +1.97 | ADP ahead |
| 2026-04-15 | 67.37 | 50.77 | +1.88 | ADP ahead |
| 2026-04-14 | 66.74 | 48.21 | +2.32 | ADP ahead |
| 2026-04-13 | 66.84 | 49.05 | +2.20 | ADP ahead |
| 2026-04-10 | 64.59 | 46.02 | +2.52 | ADP ahead |
| 2026-04-09 | 67.06 | 46.25 | +2.90 | ADP ahead |
| 2026-04-08 | 68.69 | 48.74 | +2.66 | ADP ahead |
| 2026-04-07 | 69.66 | 52.16 | +2.14 | ADP ahead |
| 2026-04-06 | 69.91 | 53.06 | +2.03 | ADP ahead |
| 2026-04-02 | 69.80 | 54.10 | +1.83 | ADP ahead |
| 2026-04-01 | 68.86 | 52.79 | +1.97 | ADP ahead |
| 2026-03-31 | 69.51 | 53.14 | +2.02 | ADP ahead |
| 2026-03-30 | 70.30 | 52.67 | +2.27 | ADP ahead |
| 2026-03-27 | 68.85 | 50.79 | +2.47 | ADP ahead |
| 2026-03-26 | 69.97 | 52.34 | +2.35 | ADP ahead |
| 2026-03-25 | 69.15 | 51.98 | +2.34 | ADP ahead |
| 2026-03-24 | 70.10 | 52.88 | +2.33 | ADP ahead |
| 2026-03-23 | 71.75 | 56.06 | +1.96 | ADP ahead |
| 2026-03-20 | 71.40 | 55.61 | +2.02 | ADP ahead |
| 2026-03-19 | 72.07 | 54.56 | +2.38 | ADP ahead |
| 2026-03-18 | 71.26 | 54.11 | +2.38 | ADP ahead |
| 2026-03-17 | 71.75 | 55.29 | +2.24 | ADP ahead |
| 2026-03-16 | 71.54 | 54.66 | +2.38 | ADP ahead |
| 2026-03-13 | 71.34 | 54.44 | +2.43 | ADP ahead |
| 2026-03-12 | 70.97 | 54.87 | +2.31 | ADP ahead |
| 2026-03-11 | 72.87 | 56.38 | +2.33 | ADP ahead |
| 2026-03-10 | 74.37 | 58.28 | +2.21 | ADP ahead |
| 2026-03-09 | 76.31 | 60.59 | +2.08 | ADP ahead |
| 2026-03-06 | 77.40 | 61.78 | +2.04 | ADP ahead |
| 2026-03-05 | 76.19 | 60.20 | +2.19 | ADP ahead |
| 2026-03-04 | 74.30 | 58.51 | +2.27 | ADP ahead |
| 2026-03-03 | 73.99 | 58.74 | +2.20 | ADP ahead |
| 2026-03-02 | 73.55 | 54.81 | +3.06 | ADP ahead |
| 2026-02-27 | 73.34 | 54.71 | +3.12 | ADP ahead |
| 2026-02-26 | 74.71 | 56.90 | +2.91 | ADP ahead |
| 2026-02-25 | 73.30 | 54.46 | +3.32 | ADP ahead |
| 2026-02-24 | 70.37 | 53.27 | +3.14 | ADP ahead |
| 2026-02-23 | 70.39 | 52.85 | +3.33 | ADP ahead |
| 2026-02-20 | 73.38 | 56.37 | +3.08 | ADP ahead |
| 2026-02-19 | 73.89 | 57.27 | +3.01 | ADP ahead |
| 2026-02-18 | 74.31 | 58.34 | +2.88 | ADP ahead |
| 2026-02-17 | 72.90 | 58.54 | +2.59 | ADP ahead |
| 2026-02-13 | 72.57 | 59.07 | +2.42 | ADP ahead |
| 2026-02-12 | 71.83 | 58.92 | +2.34 | ADP ahead |
| 2026-02-11 | 74.44 | 59.13 | +2.88 | ADP ahead |
| 2026-02-10 | 77.16 | 62.68 | +2.57 | ADP ahead |
| 2026-02-09 | 77.53 | 63.22 | +2.55 | ADP ahead |
| 2026-02-06 | 79.15 | 66.64 | +2.07 | ADP ahead |
| 2026-02-05 | 80.05 | 64.94 | +2.70 | ADP ahead |
| 2026-02-04 | 80.29 | 69.60 | +1.66 | ADP ahead |
| 2026-02-03 | 80.43 | 65.92 | +2.60 | ADP ahead |
| 2026-02-02 | 84.70 | 70.92 | +2.28 | ADP ahead |
| 2026-01-30 | 84.44 | 71.84 | +2.05 | ADP ahead |
| 2026-01-29 | 84.15 | 71.44 | +2.10 | ADP ahead |
| 2026-01-28 | 85.77 | 77.36 | +1.11 | ADP ahead |
| 2026-01-27 | 87.07 | 77.14 | +1.42 | ADP ahead |
| 2026-01-26 | 88.33 | 78.06 | +1.47 | ADP ahead |
| 2026-01-23 | 88.22 | 77.41 | +1.61 | ADP ahead |
| 2026-01-22 | 88.90 | 76.97 | +1.85 | ADP ahead |
| 2026-01-21 | 87.92 | 75.02 | +2.12 | ADP ahead |
| 2026-01-20 | 87.28 | 74.85 | +2.06 | ADP ahead |
| 2026-01-16 | 89.10 | 76.43 | +2.08 | ADP ahead |
| 2026-01-15 | 89.02 | 78.83 | +1.56 | ADP ahead |
| 2026-01-14 | 88.44 | 79.35 | +1.34 | ADP ahead |
| 2026-01-13 | 87.95 | 81.62 | +0.77 | ADP ahead |
| 2026-01-12 | 89.91 | 85.04 | +0.46 | near the usual relationship |
| 2026-01-09 | 91.01 | 84.75 | +0.73 | ADP ahead |
| 2026-01-08 | 90.89 | 85.81 | +0.50 | ADP ahead |
| 2026-01-07 | 89.38 | 86.36 | +0.11 | near the usual relationship |
| 2026-01-06 | 89.34 | 86.02 | +0.18 | near the usual relationship |
| 2026-01-05 | 88.04 | 85.45 | +0.05 | near the usual relationship |
| 2026-01-02 | 86.52 | 84.17 | +0.01 | near the usual relationship |
| 2025-12-31 | 88.01 | 87.85 | -0.41 | near the usual relationship |
| 2025-12-30 | 88.79 | 88.73 | -0.42 | near the usual relationship |
| 2025-12-29 | 88.82 | 89.57 | -0.56 | WDAY ahead |
| 2025-12-26 | 88.56 | 90.27 | -0.73 | WDAY ahead |
| 2025-12-24 | 88.30 | 88.70 | -0.48 | near the usual relationship |
| 2025-12-23 | 87.93 | 88.12 | -0.43 | near the usual relationship |
| 2025-12-22 | 88.86 | 89.16 | -0.44 | near the usual relationship |
| 2025-12-19 | 88.25 | 89.43 | -0.59 | WDAY ahead |
| 2025-12-18 | 89.28 | 89.20 | -0.35 | near the usual relationship |
| 2025-12-17 | 90.82 | 88.35 | +0.07 | near the usual relationship |
| 2025-12-16 | 89.70 | 88.40 | -0.12 | near the usual relationship |
| 2025-12-15 | 90.65 | 87.90 | +0.13 | near the usual relationship |
| 2025-12-12 | 91.04 | 91.82 | -0.47 | near the usual relationship |
| 2025-12-11 | 90.56 | 91.64 | -0.51 | WDAY ahead |
| 2025-12-10 | 88.73 | 91.11 | -0.73 | WDAY ahead |
| 2025-12-09 | 88.35 | 90.91 | -0.76 | WDAY ahead |
| 2025-12-08 | 88.50 | 90.40 | -0.64 | WDAY ahead |
| 2025-12-05 | 89.51 | 89.97 | -0.40 | near the usual relationship |
| 2025-12-04 | 88.75 | 88.60 | -0.30 | near the usual relationship |
| 2025-12-03 | 89.03 | 87.88 | -0.13 | near the usual relationship |
| 2025-12-02 | 87.99 | 87.15 | -0.18 | near the usual relationship |
| 2025-12-01 | 87.53 | 87.27 | -0.27 | near the usual relationship |
| 2025-11-28 | 87.34 | 88.20 | -0.46 | near the usual relationship |
| 2025-11-26 | 87.01 | 88.08 | -0.50 | WDAY ahead |
| 2025-11-25 | 87.69 | 95.59 | -1.62 | WDAY ahead |
| 2025-11-24 | 85.57 | 92.70 | -1.53 | WDAY ahead |
| 2025-11-21 | 86.60 | 92.09 | -1.25 | WDAY ahead |
| 2025-11-20 | 85.21 | 88.68 | -0.93 | WDAY ahead |
| 2025-11-19 | 85.67 | 91.57 | -1.33 | WDAY ahead |
| 2025-11-18 | 85.43 | 92.29 | -1.50 | WDAY ahead |
| 2025-11-17 | 85.84 | 92.01 | -1.38 | WDAY ahead |
| 2025-11-14 | 86.59 | 94.41 | -1.65 | WDAY ahead |
| 2025-11-13 | 87.11 | 91.41 | -1.07 | WDAY ahead |
| 2025-11-12 | 87.09 | 92.41 | -1.24 | WDAY ahead |
| 2025-11-11 | 87.31 | 92.84 | -1.28 | WDAY ahead |
| 2025-11-10 | 86.92 | 93.25 | -1.43 | WDAY ahead |
| 2025-11-07 | 86.95 | 92.10 | -1.24 | WDAY ahead |
| 2025-11-06 | 86.34 | 91.83 | -1.31 | WDAY ahead |
| 2025-11-05 | 88.81 | 94.94 | -1.40 | WDAY ahead |
| 2025-11-04 | 88.69 | 95.50 | -1.52 | WDAY ahead |
| 2025-11-03 | 87.98 | 97.22 | -1.95 | WDAY ahead |
| 2025-10-31 | 89.06 | 98.13 | -1.93 | WDAY ahead |
| 2025-10-30 | 89.48 | 95.25 | -1.39 | WDAY ahead |
| 2025-10-29 | 89.37 | 94.63 | -1.31 | WDAY ahead |
| 2025-10-28 | 95.67 | 96.91 | -0.61 | WDAY ahead |
| 2025-10-27 | 95.98 | 97.72 | -0.69 | WDAY ahead |
| 2025-10-24 | 96.12 | 99.29 | -0.93 | WDAY ahead |
| 2025-10-23 | 96.33 | 99.51 | -0.93 | WDAY ahead |
| 2025-10-22 | 97.15 | 99.33 | -0.77 | WDAY ahead |
| 2025-10-21 | 97.16 | 100.49 | -0.96 | WDAY ahead |
| 2025-10-20 | 96.83 | 98.66 | -0.72 | WDAY ahead |
| 2025-10-17 | 96.23 | 95.82 | -0.35 | near the usual relationship |
| 2025-10-16 | 95.85 | 93.10 | +0.06 | near the usual relationship |
| 2025-10-15 | 97.24 | 96.02 | -0.21 | near the usual relationship |
| 2025-10-14 | 97.82 | 97.01 | -0.28 | near the usual relationship |
| 2025-10-13 | 97.28 | 96.78 | -0.33 | near the usual relationship |
| 2025-10-10 | 97.57 | 95.38 | -0.04 | near the usual relationship |
| 2025-10-09 | 97.81 | 97.44 | -0.35 | near the usual relationship |
| 2025-10-08 | 99.46 | 97.45 | -0.08 | near the usual relationship |
| 2025-10-07 | 100.22 | 95.37 | +0.39 | near the usual relationship |
| 2025-10-06 | 99.40 | 97.50 | -0.09 | near the usual relationship |
| 2025-10-03 | 99.66 | 96.73 | +0.08 | near the usual relationship |
| 2025-10-02 | 99.17 | 94.94 | +0.31 | near the usual relationship |
| 2025-10-01 | 99.77 | 94.98 | +0.40 | near the usual relationship |
| 2025-09-30 | 100.41 | 98.47 | -0.06 | near the usual relationship |
| 2025-09-29 | 100.13 | 101.31 | -0.55 | WDAY ahead |
| 2025-09-26 | 99.74 | 100.90 | -0.55 | WDAY ahead |
| 2025-09-25 | 98.84 | 99.29 | -0.43 | near the usual relationship |
| 2025-09-24 | 99.73 | 98.79 | -0.21 | near the usual relationship |
| 2025-09-23 | 98.95 | 98.30 | -0.25 | near the usual relationship |
| 2025-09-22 | 100.47 | 99.26 | -0.15 | near the usual relationship |
| 2025-09-19 | 99.90 | 95.56 | +0.35 | near the usual relationship |
| 2025-09-18 | 99.54 | 95.51 | +0.31 | near the usual relationship |
| 2025-09-17 | 98.79 | 96.07 | +0.11 | near the usual relationship |
| 2025-09-16 | 98.77 | 89.58 | +1.19 | ADP ahead |
| 2025-09-15 | 99.51 | 91.11 | +1.05 | ADP ahead |
| 2025-09-12 | 100.41 | 91.37 | +1.15 | ADP ahead |
| 2025-09-11 | 101.96 | 92.72 | +1.17 | ADP ahead |
| 2025-09-10 | 100.03 | 92.64 | +0.90 | ADP ahead |
| 2025-09-09 | 101.69 | 94.38 | +0.87 | ADP ahead |
| 2025-09-08 | 102.10 | 94.82 | +0.87 | ADP ahead |
| 2025-09-05 | 101.26 | 94.52 | +0.80 | ADP ahead |
| 2025-09-04 | 103.04 | 94.54 | +1.06 | ADP ahead |
| 2025-09-03 | 102.25 | 95.48 | +0.80 | ADP ahead |
| 2025-09-02 | 102.56 | 93.62 | +1.14 | ADP ahead |
| 2025-08-29 | 104.02 | 94.41 | +1.23 | ADP ahead |
| 2025-08-28 | 104.04 | 93.46 | +1.38 | ADP ahead |
| 2025-08-27 | 103.69 | 93.96 | +1.27 | ADP ahead |
| 2025-08-26 | 103.82 | 91.16 | +1.73 | ADP ahead |
| 2025-08-25 | 103.95 | 91.37 | +1.73 | ADP ahead |
| 2025-08-22 | 105.36 | 90.51 | +2.09 | ADP ahead |
| 2025-08-21 | 104.33 | 93.09 | +1.56 | ADP ahead |
| 2025-08-20 | 105.73 | 93.05 | +1.77 | ADP ahead |
| 2025-08-19 | 104.59 | 93.99 | +1.48 | ADP ahead |
| 2025-08-18 | 103.54 | 94.83 | +1.21 | ADP ahead |
| 2025-08-15 | 103.25 | 92.48 | +1.55 | ADP ahead |
| 2025-08-14 | 103.21 | 90.77 | +1.84 | ADP ahead |
| 2025-08-13 | 104.33 | 91.24 | +1.94 | ADP ahead |
| 2025-08-12 | 102.51 | 87.78 | +2.29 | ADP ahead |
| 2025-08-11 | 103.91 | 87.41 | +2.60 | ADP ahead |
| 2025-08-08 | 104.63 | 90.83 | +2.14 | ADP ahead |
| 2025-08-07 | 103.83 | 90.39 | +2.12 | ADP ahead |
| 2025-08-06 | 103.20 | 93.70 | +1.48 | ADP ahead |
| 2025-08-05 | 102.45 | 92.02 | +1.66 | ADP ahead |
| 2025-08-04 | 103.41 | 92.08 | +1.82 | ADP ahead |
| 2025-08-01 | 102.79 | 90.89 | +1.95 | ADP ahead |
| 2025-07-31 | 105.89 | 93.82 | +1.94 | ADP ahead |
| 2025-07-30 | 106.38 | 97.22 | +1.46 | ADP ahead |
| 2025-07-29 | 105.59 | 98.02 | +1.22 | ADP ahead |
| 2025-07-28 | 105.00 | 97.37 | +1.25 | ADP ahead |
| 2025-07-25 | 105.59 | 98.88 | +1.10 | ADP ahead |
| 2025-07-24 | 104.77 | 97.02 | +1.29 | ADP ahead |
| 2025-07-23 | 104.08 | 98.59 | +0.94 | ADP ahead |
| 2025-07-22 | 103.66 | 97.80 | +1.01 | ADP ahead |
| 2025-07-21 | 102.95 | 95.59 | +1.27 | ADP ahead |
| 2025-07-18 | 103.25 | 95.33 | +1.37 | ADP ahead |
| 2025-07-17 | 103.36 | 94.44 | +1.54 | ADP ahead |
| 2025-07-16 | 102.73 | 92.74 | +1.74 | ADP ahead |
| 2025-07-15 | 102.02 | 92.00 | +1.77 | ADP ahead |
| 2025-07-14 | 103.79 | 91.93 | +2.06 | ADP ahead |
| 2025-07-11 | 103.54 | 91.37 | +2.14 | ADP ahead |
| 2025-07-10 | 104.63 | 93.79 | +1.91 | ADP ahead |
| 2025-07-09 | 105.52 | 98.24 | +1.32 | ADP ahead |
| 2025-07-08 | 105.00 | 98.36 | +1.24 | ADP ahead |
| 2025-07-07 | 105.51 | 98.66 | +1.27 | ADP ahead |
| 2025-07-03 | 105.79 | 98.89 | +1.29 | ADP ahead |
| 2025-07-02 | 104.37 | 97.24 | +1.35 | ADP ahead |
| 2025-07-01 | 106.10 | 97.85 | +1.51 | ADP ahead |
| 2025-06-30 | 105.51 | 98.17 | +1.39 | ADP ahead |
| 2025-06-27 | 103.82 | 97.09 | +1.32 | ADP ahead |
| 2025-06-26 | 103.66 | 97.03 | +1.32 | ADP ahead |
| 2025-06-25 | 102.02 | 95.49 | +1.33 | ADP ahead |
| 2025-06-24 | 106.54 | 97.84 | +1.64 | ADP ahead |
| 2025-06-23 | 106.14 | 96.77 | +1.78 | ADP ahead |
| 2025-06-20 | 104.78 | 97.43 | +1.48 | ADP ahead |
| 2025-06-18 | 104.95 | 96.89 | +1.61 | ADP ahead |
| 2025-06-17 | 105.24 | 99.27 | +1.27 | ADP ahead |
| 2025-06-16 | 105.34 | 100.48 | +1.10 | ADP ahead |
| 2025-06-13 | 104.97 | 100.02 | +1.13 | ADP ahead |
| 2025-06-12 | 105.97 | 102.54 | +0.89 | ADP ahead |
| 2025-06-11 | 106.87 | 102.81 | +0.99 | ADP ahead |
| 2025-06-10 | 107.61 | 103.37 | +1.02 | ADP ahead |
| 2025-06-09 | 108.99 | 103.44 | +1.22 | ADP ahead |
| 2025-06-06 | 111.81 | 103.37 | +1.66 | ADP ahead |
| 2025-06-05 | 111.61 | 102.30 | +1.82 | ADP ahead |
| 2025-06-04 | 111.60 | 102.05 | +1.88 | ADP ahead |
| 2025-06-03 | 111.71 | 102.72 | +1.81 | ADP ahead |
| 2025-06-02 | 111.46 | 101.34 | +2.02 | ADP ahead |
| 2025-05-30 | 111.37 | 101.32 | +2.03 | ADP ahead |
| 2025-05-29 | 110.89 | 98.89 | +2.40 | ADP ahead |
| 2025-05-28 | 110.90 | 98.13 | +2.54 | ADP ahead |
| 2025-05-27 | 111.43 | 97.88 | +2.68 | ADP ahead |
| 2025-05-23 | 109.85 | 97.35 | +2.54 | ADP ahead |
| 2025-05-22 | 110.04 | 111.29 | +0.34 | near the usual relationship |
| 2025-05-21 | 110.38 | 109.84 | +0.61 | ADP ahead |
| 2025-05-20 | 110.44 | 112.01 | +0.31 | near the usual relationship |
| 2025-05-19 | 110.49 | 111.79 | +0.36 | near the usual relationship |
| 2025-05-16 | 109.26 | 111.69 | +0.20 | near the usual relationship |
| 2025-05-15 | 108.06 | 112.37 | -0.06 | near the usual relationship |
| 2025-05-14 | 105.86 | 110.92 | -0.17 | near the usual relationship |
| 2025-05-13 | 105.44 | 110.45 | -0.15 | near the usual relationship |
| 2025-05-12 | 105.85 | 109.04 | +0.11 | near the usual relationship |
| 2025-05-09 | 105.28 | 106.01 | +0.46 | near the usual relationship |
| 2025-05-08 | 105.06 | 105.52 | +0.50 | ADP ahead |
| 2025-05-07 | 104.41 | 102.50 | +0.84 | ADP ahead |
| 2025-05-06 | 103.78 | 101.35 | +0.92 | ADP ahead |
| 2025-05-05 | 103.99 | 101.58 | +0.92 | ADP ahead |
| 2025-05-02 | 103.86 | 101.72 | +0.89 | ADP ahead |
| 2025-05-01 | 102.19 | 100.87 | +0.78 | ADP ahead |
| 2025-04-30 | 102.84 | 100.21 | +0.97 | ADP ahead |
| 2025-04-29 | 101.19 | 99.55 | +0.84 | ADP ahead |
| 2025-04-28 | 100.44 | 98.09 | +0.94 | ADP ahead |
| 2025-04-25 | 99.82 | 97.98 | +0.88 | ADP ahead |
| 2025-04-24 | 100.77 | 96.89 | +1.17 | ADP ahead |
| 2025-04-23 | 100.43 | 91.98 | +1.83 | ADP ahead |
| 2025-04-22 | 100.21 | 90.39 | +2.04 | ADP ahead |
| 2025-04-21 | 97.45 | 87.57 | +2.10 | ADP ahead |
| 2025-04-17 | 100.34 | 90.40 | +2.08 | ADP ahead |
| 2025-04-16 | 100.63 | 93.14 | +1.73 | ADP ahead |
| 2025-04-15 | 101.97 | 95.44 | +1.59 | ADP ahead |
| 2025-04-14 | 103.17 | 95.03 | +1.79 | ADP ahead |
| 2025-04-11 | 102.48 | 92.65 | +2.04 | ADP ahead |
| 2025-04-10 | 99.97 | 91.93 | +1.83 | ADP ahead |
| 2025-04-09 | 100.82 | 94.66 | +1.57 | ADP ahead |
| 2025-04-08 | 94.69 | 86.09 | +1.98 | ADP ahead |
| 2025-04-07 | 96.21 | 88.07 | +1.90 | ADP ahead |
| 2025-04-04 | 97.89 | 88.82 | +2.02 | ADP ahead |
| 2025-04-03 | 104.48 | 93.39 | +2.22 | ADP ahead |
| 2025-04-02 | 105.11 | 96.28 | +1.92 | ADP ahead |
| 2025-04-01 | 104.88 | 95.93 | +1.94 | ADP ahead |
| 2025-03-31 | 104.53 | 95.52 | +1.96 | ADP ahead |
| 2025-03-28 | 102.92 | 97.55 | +1.52 | ADP ahead |
| 2025-03-27 | 104.50 | 100.03 | +1.40 | ADP ahead |
| 2025-03-26 | 103.46 | 102.58 | +0.99 | ADP ahead |
| 2025-03-25 | 102.43 | 103.42 | +0.78 | ADP ahead |
| 2025-03-24 | 102.26 | 102.22 | +0.90 | ADP ahead |
| 2025-03-21 | 101.04 | 102.05 | +0.78 | ADP ahead |
| 2025-03-20 | 101.79 | 102.45 | +0.83 | ADP ahead |
| 2025-03-19 | 102.22 | 103.28 | +0.79 | ADP ahead |
| 2025-03-18 | 101.25 | 103.04 | +0.71 | ADP ahead |
| 2025-03-17 | 101.47 | 102.51 | +0.80 | ADP ahead |
| 2025-03-14 | 99.82 | 99.87 | +0.91 | ADP ahead |
| 2025-03-13 | 99.40 | 97.03 | +1.19 | ADP ahead |
| 2025-03-12 | 100.65 | 98.85 | +1.13 | ADP ahead |
| 2025-03-11 | 100.05 | 99.37 | +1.01 | ADP ahead |
| 2025-03-10 | 103.66 | 99.39 | +1.40 | ADP ahead |
| 2025-03-07 | 104.84 | 103.23 | +1.12 | ADP ahead |
| 2025-03-06 | 103.48 | 103.80 | +0.93 | ADP ahead |
| 2025-03-05 | 106.21 | 106.19 | +0.97 | ADP ahead |
| 2025-03-04 | 107.24 | 103.74 | +1.31 | ADP ahead |
| 2025-03-03 | 109.02 | 104.13 | +1.45 | ADP ahead |
| 2025-02-28 | 107.83 | 107.71 | +0.99 | ADP ahead |
| 2025-02-27 | 106.50 | 106.58 | +0.98 | ADP ahead |
| 2025-02-26 | 106.53 | 110.88 | +0.59 | ADP ahead |
| 2025-02-25 | 107.21 | 104.39 | +1.25 | ADP ahead |
| 2025-02-24 | 106.81 | 107.09 | +0.97 | ADP ahead |
| 2025-02-21 | 106.32 | 104.87 | +1.13 | ADP ahead |
| 2025-02-20 | 106.73 | 107.01 | +0.98 | ADP ahead |
| 2025-02-19 | 107.16 | 106.80 | +1.04 | ADP ahead |
| 2025-02-18 | 106.04 | 108.69 | +0.78 | ADP ahead |
| 2025-02-14 | 105.43 | 105.55 | +1.00 | ADP ahead |
| 2025-02-13 | 106.13 | 106.40 | +0.99 | ADP ahead |
| 2025-02-12 | 104.91 | 105.50 | +0.97 | ADP ahead |
| 2025-02-11 | 104.62 | 107.58 | +0.77 | ADP ahead |
| 2025-02-10 | 105.01 | 110.39 | +0.58 | ADP ahead |
| 2025-02-07 | 104.68 | 111.21 | +0.49 | near the usual relationship |
| 2025-02-06 | 105.71 | 113.64 | +0.39 | near the usual relationship |
| 2025-02-05 | 105.43 | 112.96 | +0.43 | near the usual relationship |
| 2025-02-04 | 104.24 | 106.24 | +0.87 | ADP ahead |
| 2025-02-03 | 105.14 | 106.25 | +0.95 | ADP ahead |
| 2025-01-31 | 103.67 | 107.19 | +0.76 | ADP ahead |
| 2025-01-30 | 103.75 | 106.38 | +0.84 | ADP ahead |
| 2025-01-29 | 102.83 | 108.56 | +0.59 | ADP ahead |
| 2025-01-28 | 102.06 | 110.61 | +0.38 | near the usual relationship |
| 2025-01-27 | 102.69 | 108.07 | +0.63 | ADP ahead |
| 2025-01-24 | 101.65 | 105.64 | +0.74 | ADP ahead |
| 2025-01-23 | 101.20 | 104.43 | +0.80 | ADP ahead |
| 2025-01-22 | 101.39 | 103.68 | +0.88 | ADP ahead |
| 2025-01-21 | 102.00 | 102.55 | +1.03 | ADP ahead |
| 2025-01-17 | 101.33 | 102.11 | +1.01 | ADP ahead |
| 2025-01-16 | 101.35 | 102.54 | +0.99 | ADP ahead |
| 2025-01-15 | 100.37 | 101.67 | +0.99 | ADP ahead |
| 2025-01-14 | 99.79 | 100.63 | +1.03 | ADP ahead |
| 2025-01-13 | 99.28 | 100.62 | +1.00 | ADP ahead |
| 2025-01-10 | 98.14 | 102.14 | +0.79 | ADP ahead |
| 2025-01-08 | 99.86 | 104.18 | +0.78 | ADP ahead |
| 2025-01-07 | 98.67 | 102.13 | +0.85 | ADP ahead |
| 2025-01-06 | 98.23 | 103.95 | +0.68 | ADP ahead |
| 2025-01-03 | 99.79 | 103.42 | +0.85 | ADP ahead |
| 2025-01-02 | 99.10 | 103.01 | +0.84 | ADP ahead |
| 2024-12-31 | 100.15 | 105.54 | +0.74 | ADP ahead |
| 2024-12-30 | 100.23 | 107.17 | +0.63 | ADP ahead |
| 2024-12-27 | 101.33 | 108.90 | +0.60 | ADP ahead |
| 2024-12-26 | 101.69 | 110.18 | +0.54 | ADP ahead |
| 2024-12-24 | 101.43 | 110.05 | +0.53 | ADP ahead |
| 2024-12-23 | 100.64 | 108.55 | +0.59 | ADP ahead |
| 2024-12-20 | 100.59 | 111.68 | +0.37 | near the usual relationship |
| 2024-12-19 | 99.67 | 109.14 | +0.48 | near the usual relationship |
| 2024-12-18 | 98.70 | 110.00 | +0.35 | near the usual relationship |
| 2024-12-17 | 101.12 | 113.71 | +0.29 | near the usual relationship |
| 2024-12-16 | 101.55 | 113.85 | +0.32 | near the usual relationship |
| 2024-12-13 | 101.53 | 111.94 | +0.45 | near the usual relationship |
| 2024-12-12 | 102.21 | 112.41 | +0.48 | near the usual relationship |
| 2024-12-11 | 102.89 | 111.40 | +0.60 | ADP ahead |
| 2024-12-10 | 103.40 | 110.80 | +0.68 | ADP ahead |
| 2024-12-09 | 101.80 | 114.49 | +0.33 | near the usual relationship |
| 2024-12-06 | 104.20 | 108.97 | +0.87 | ADP ahead |
| 2024-12-05 | 103.25 | 107.45 | +0.91 | ADP ahead |
| 2024-12-04 | 103.83 | 109.98 | +0.79 | ADP ahead |
| 2024-12-03 | 103.86 | 105.15 | +1.13 | ADP ahead |
| 2024-12-02 | 104.70 | 102.86 | +1.36 | ADP ahead |
| 2024-11-29 | 105.01 | 102.25 | +1.44 | ADP ahead |
| 2024-11-27 | 105.01 | 103.65 | +1.35 | ADP ahead |
| 2024-11-26 | 105.36 | 110.52 | +0.91 | ADP ahead |
| 2024-11-25 | 104.23 | 109.49 | +0.91 | ADP ahead |
| 2024-11-22 | 104.40 | 109.52 | +0.92 | ADP ahead |
| 2024-11-21 | 104.20 | 109.65 | +0.90 | ADP ahead |
| 2024-11-20 | 102.16 | 106.12 | +1.01 | ADP ahead |
| 2024-11-19 | 101.80 | 106.31 | +0.97 | ADP ahead |
| 2024-11-18 | 101.92 | 106.09 | +1.00 | ADP ahead |
| 2024-11-15 | 101.83 | 106.11 | +1.00 | ADP ahead |
| 2024-11-14 | 103.32 | 111.05 | +0.77 | ADP ahead |
| 2024-11-13 | 105.20 | 113.10 | +0.78 | ADP ahead |
| 2024-11-12 | 105.34 | 110.57 | +0.96 | ADP ahead |
| 2024-11-11 | 104.96 | 108.05 | +1.11 | ADP ahead |
| 2024-11-08 | 104.26 | 104.93 | +1.29 | ADP ahead |
| 2024-11-07 | 104.30 | 105.52 | +1.26 | ADP ahead |
| 2024-11-06 | 104.41 | 102.99 | +1.47 | ADP ahead |
| 2024-11-05 | 99.62 | 98.68 | +1.45 | ADP ahead |
| 2024-11-04 | 99.17 | 98.63 | +1.43 | ADP ahead |
| 2024-11-01 | 98.59 | 97.81 | +1.46 | ADP ahead |
| 2024-10-31 | 98.96 | 95.65 | +1.67 | ADP ahead |
| 2024-10-30 | 100.17 | 97.46 | +1.63 | ADP ahead |
| 2024-10-29 | 98.52 | 97.61 | +1.50 | ADP ahead |
| 2024-10-28 | 98.00 | 96.10 | +1.60 | ADP ahead |
| 2024-10-25 | 98.52 | 97.23 | +1.56 | ADP ahead |
| 2024-10-24 | 99.02 | 96.87 | +1.63 | ADP ahead |
| 2024-10-23 | 99.23 | 99.00 | +1.48 | ADP ahead |
| 2024-10-22 | 99.67 | 100.93 | +1.37 | ADP ahead |
| 2024-10-21 | 99.53 | 99.70 | +1.46 | ADP ahead |
| 2024-10-18 | 100.00 | 100.00 | +1.47 | ADP ahead |
One-day company-specific moves (4+ standard deviations, which block ideas for 10 sessions): May 23, 2025 (ADP -0.2%, WDAY -12.5%); May 29, 2026 (ADP +0.9%, WDAY +12.4%); Aug 13, 2026 (ADP +2.6%, WDAY +17.8%). Upcoming earnings: ADP Oct 28, 2026 (pre-market).
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
ADP and WDAY at a glance
ADP Automatic Data Processing Inc.
- Listing
- Nasdaq · SEC CIK 8670
- Industry
- EDP Services · SIC 7374 Services-Computer Processing & Data Preparation
- Market value
- $113.7B
- Price history
- 2,521 daily closes, Oct 12, 2016 to Oct 22, 2026
WDAY Workday Inc.
- Listing
- Nasdaq · SEC CIK 1327811
- Industry
- EDP Services · SIC 7374 Services-Computer Processing & Data Preparation
- Market value
- $47.0B
- 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 ADP and WDAY
| Pair | Status | Ahead now | Industry |
|---|---|---|---|
| ADP / RDDT | Watchlist | ADP by 2.31 sd | SIC 7374 Services-Computer Processing & Data Preparation |
| WDAY / RDDT | Watchlist | WDAY by 1.91 sd | SIC 7374 Services-Computer Processing & Data Preparation |
| ADP / INFY | Watchlist | ADP by 1.33 sd | EDP Services |
| INFY / WDAY | Watchlist | WDAY by 1.31 sd | EDP Services |
Follow the research behind the paper book
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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.
