Merck & Co., Inc.
Merck & Co., Inc. (MRK) Shares Outstanding — Overview
Basic and diluted weighted average shares, YoY change, float context, and historical trend from SEC filings and FMP.
MRK · shares outstanding · updated Jun 8, 2026
Key metrics
as of Dec 31, 2025Shares Outstanding Growth Rate
CAGR · weighted avg basic sharesNegative CAGR typically indicates share buyback or retirement activity. Interpret alongside Splits and Financials tabs. Splits / Financials
Shares outstanding history
Annual shares outstanding by year
Healthcare sector shares outstanding comparison
Shares Outstanding for similar companies or competitors in the Healthcare sector.
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Understanding Shares Outstanding
Basic · Diluted · FloatWhat Are Shares Outstanding? (Basic)
Merck & Co., Inc. (MRK) shares outstanding is the total number of issued shares held by shareholders — the basis for Basic EPS and market capitalization. As of December 31, 2025, Merck & Co., Inc. reports 2.502B basic shares outstanding (weighted average).
Basic vs. Diluted Shares Outstanding
Merck & Co., Inc.'s basic shares outstanding (2.502B) represents currently issued shares. Diluted shares outstanding (2.507B) also includes potential shares from stock options, RSUs, and convertibles. Dilution spread: +0.20%.
Shares Outstanding vs. Float (Free Float)
Merck & Co., Inc.'s float is 2.466B (99.8% of total shares outstanding) — shares freely available for public trading, excluding insider-held and restricted shares.
ⓘ Float data from /shares-float reflects the most recent SEC filing period-end. The weighted average shares (from /income-statement) may differ — this is a normal reporting window difference, not a data error.
FMP /income-statement · /shares-float · SEC EDGAR · USD
About shares outstanding & methodology
Merck & Co., Inc. (MRK) shares outstanding history from 2006 to 2025. Shares outstanding can be defined as the total number of shares held by all shareholders — including institutional investors, retail investors, and company insiders — assuming conversion of all convertible debt, securities, warrants, and options. This metric excludes the company's treasury shares.
Merck & Co., Inc. shares outstanding for the fiscal year ending December 31, 2025 were 2.502B, a 1.18% decline year-over-year. Merck & Co., Inc. FY 2025 shares outstanding were 2.502B, a -1.18% decline from FY 2024.
Merck & Co., Inc. is a leading company operating in the Healthcare sector. The company's share count trajectory — with a 10-year CAGR of -1.1% — is a key signal for investors evaluating capital return policy, EPS accretion, and long-term shareholder value creation.
Frequently asked questions
MRK shares outstanding · 4 questionsAs of December 31, 2025, Merck & Co., Inc. (MRK) has approximately 2.502B basic shares outstanding and 2.507B diluted shares outstanding. This represents a -1.18% year-over-year change from FY 2024 (2.532B). Merck & Co., Inc.'s declining share count is primarily driven by its share buyback program. For the complete historical data table, see the history table above.
▸ Data: FMP /income-statement · /shares-float · SEC EDGAR · weighted average basis · Merck & Co., Inc. SEC 10-K & 10-Q filings · US GAAP · Last updated: 2026-06-08