IPO date
January 13, 1978
Total splits
7
Cumulative multiple
226.368
Split likelihood
Elevated
Stock splits history for Merck & Co. (MRK) from 1964 to 2021
Cumulative multiple is the running product of split factors from the oldest row through each date.
| Type | Ratio | Pre-split | Post-split | |||
|---|---|---|---|---|---|---|
| June 3, 2021 | Stock split | 131:125 | x1.048 | x226.368 | $75.81 | $73.22 |
| February 17, 1999 | Stock split | 2:1 | x2 | x216 | $153.83 | $76.94 |
| May 26, 1992 | Stock split | 3:1 | x3 | x108 | $152.55 | $50.85 |
| May 26, 1988 | Stock split | 3:1 | x3 | x36 | $149.97 | $49.99 |
| May 27, 1986 | Stock split | 2:1 | x2 | x12 | $188.26 | $97.53 |
| June 1, 1972 | Stock split | 2:1 | x2 | x6 | — | $54.33 |
| May 27, 1964 | Stock split | 3:1 | x3 | x3 | — | $54.33 |
- June 3, 2021x226.368
- February 17, 1999x216
- May 26, 1992x108
- May 26, 1988x36
- May 27, 1986x12
- June 1, 1972x6
- May 27, 1964x3
Pre-split price is the final regular-session close on a trading day strictly before the split calendar date. Post-split price is the first session open on or after that date. Both values come from unadjusted end-of-day bars for the company's primary listing.
The Type column reflects the data feed's event category (for example stock split vs stock dividend). When the feed labels a generic split but the ratio is reverse (e.g. 1:10), we show reverse stock split. Optional editorial context for a row appears next to the split ratio as an info icon (hover or keyboard focus on desktop; tap on mobile). The same text is listed under Row notes when that block is expanded.
Wondering why some rows show ratios like 51:50 or 2000:1973? Read: stock split ratios explained → How the cumulative column is computed: cumulative split multiplier explained. For ratios driven by spin-offs, see spin-offs explained. Or read the methodology for how prices and cumulative multiples are computed.
Split likelihood score for Merck & Co. (MRK)
Computed through June 13, 2026.
| Factor | Detail | Contribution |
|---|---|---|
| Absolute price | Price $119.05 → 36% of the price band | +14 |
| Personal split threshold | Price is 112% of the company's typical pre-split price ($106.51) | +28 |
| Split track record | 7 prior splits on record | +20 |
| Proximity to 52-week high | Price is 95% of the 52-week high | +12 |
An educational, rule-based score — not a prediction of any split and not investment advice. Splits are at the sole discretion of a company's board. How it's calculated · Will a stock split?
Stock splits — Healthcare
Healthcare peers of Merck & Co., Inc. (MRK), sorted by number of splits.
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