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← Back to 13F holdingsStock detail · v1

MERCK & CO. INC

$MRK
Last close: $111.90(2026-04-24)BRK current position: 9,157,192 shares ($0.71B as of 2021-06-30)Quarters with activity: 4CUSIP: 58933Y105

Price history with Berkshire transactions

InitiatedAddedTrimmedExited
MRKS&P 500 (right axis, $)Shares held (right axis)
$60$80$100$120201820192020202120222023202420252026$179$319$459$599$73907M14M22M29MINIT

Hover for daily price. Triangle markers show quarter-end Berkshire buy (▲ green) / sell (▼ orange/red) events from 13F-HR filings. Quarter-level granularity only — actual trade dates are not disclosed.

Berkshire's quarterly position history

QuarterSharesΔ SharesActionValue (USD)13F
2021-06-309,157,192-8,725,196trimmed$712.2MView
2021-03-3117,882,388-10,815,047trimmed$1,378.6MView
2020-12-3128,697,435+6,294,333added$2,347.5MView
2020-09-3022,403,102+22,403,102initiated$1,858.3MView

Prices via Yahoo Finance. Berkshire position data from quarterly 13F-HR filings. 13F has a ~45-day filing lag and only covers long US-listed equity positions. Cost basis below is approximated from the quarter-end value at which shares were added (FIFO).