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Merck & Co., Inc.

MRKNYSEPharmaceutical PreparationsFiscal year ends December 31
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 7, 2026Score 9/30242% above fair value
$148.36−1.16 (-0.78%)

Close on Nov 2, 2026Market cap $366.03BP/E 118.7Yield 2.21%

Merck Dificid (fidaxomicin by Quarter

Dificid (fidaxomicin — C. difficile infection) — Worldwide constant-currency (ex-exchange) growth YoY (%) (%)

QuarterlyAnnual

Merck Dificid (fidaxomicin: -77.0% in Q2 2026, down 82.0 pts from a year earlier. That is the lowest of the 14 quarters on record here.

Latest, Q2 2026
-77.0%
Period ended Jun 30, 2026
Change on a year earlier
-82.0 pts
5.0% in Q2 2025
History
14 quarters
Since Q1 2022
Sources
14
Documents cited below

Where the Q2 2026 figure comes from

“|| Dificid | 34 | 22 | 56 | 83 | 96 | 179 | 43 | 25 | 247 | -77 | -77 | -69 | -69”

Source: Form 8-K (tm2621496d1_ex99-1.htm, filed 2026-08-04) ↗

Reported in Form 8-K Table 3 / 10-K / 10-Q MD&A.

Quarterly history

Hover a value to see the sentence it was read from; calculated values show their formula

PeriodEndedDificid (fidaxomicin — C. difficile infection) — Worldwide constant-currency (ex-exchange) growth YoY (%) (%)Year on yearSource
Q2 2026Jun 30, 2026-77.0%-82.0 ptsForm 8-K (tm2621496d1_ex99-1.htm, filed 2026-08-04) ↗
Q4 2025Dec 31, 2025-68.0%-59.0 ptsForm 8-K (tm264564d1_ex99-1.htm, filed 2026-02-03) ↗
Q3 2025Sep 30, 2025-55.0%–Form 8-K (tm2529620d1_ex99-1.htm, filed 2025-10-30) ↗
Q2 2025Jun 30, 20255.0%-15.0 ptsForm 8-K (tm2521736d1_ex99-1.htm, filed 2025-07-29) ↗
Q4 2024Dec 31, 2024-9.0%-39.0 ptsForm 8-K (tm255059d1_ex99-1.htm, filed 2025-02-04) ↗
Q2 2024Jun 30, 202420.0%+6.0 ptsForm 8-K (tm2420272d1_ex99-1.htm, filed 2024-07-30) ↗
Q1 2024Mar 31, 202412.0%-13.0 ptsForm 8-K (tm2412490d1_ex99-1.htm, filed 2024-04-25) ↗
Q4 2023Dec 31, 202330.0%–Form 8-K (tm244517d1_ex99-1.htm, filed 2024-02-01) ↗
Q3 2023Sep 30, 2023-4.0%-46.0 ptsForm 8-K (tm2328962d1_ex99-1.htm, filed 2023-10-26) ↗
Q2 2023Jun 30, 202314.0%-81.0 ptsForm 8-K (tm2322190d1_ex99-1.htm, filed 2023-08-01) ↗
Q1 2023Mar 31, 202325.0%-71.0 ptsForm 8-K (tm2313695d1_ex99-1.htm, filed 2023-04-27) ↗
Q3 2022Sep 30, 202242.0%–Form 8-K (tm2227726d1_ex99-1.htm, filed 2022-10-27) ↗
Q2 2022Jun 30, 202295.0%–Form 8-K (tm2221828d1_ex99-1.htm, filed 2022-07-28) ↗
Q1 2022Mar 31, 202296.0%–Form 8-K (tm2213615d1_ex99-1.htm, filed 2022-04-28) ↗

Cite this data

StockData. (2026). Merck Dificid (fidaxomicin (%), quarterly Q1 2022–Q2 2026 [Data set]. Compiled from Merck SEC filings and investor materials. https://stockdatahq.com/stocks/mrk/kpis/rev-dificid-ww-exfx-yoy

See every metric in the Merck KPI table. Data updated Oct 26, 2026.