BlackRock, Inc. MRK — MERCK & CO INC

Ownership history in BlackRock, Inc.  ·  7 quarters on record

AI Ownership Summary

BlackRock, Inc. reported MERCK & CO INC (MRK) in 7 quarterly 13F filings from 2024 Q3 through 2025 Q4. Peak portfolio weight reached 0.51% in 2024 Q3. The latest visible filing shows MRK at 0.39% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this MRK ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was BlackRock, Inc.'s position in MERCK & CO INC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2025 Q4

MRK was reported at 0.39% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.51% in 2024 Q3

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2024 Q3 to 2025 Q4

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

MRK stock page BlackRock, Inc. fund profile BlackRock, Inc. full holdings
How BlackRock, Inc. held MRK — position size vs. price
% of Fund (quarterly)    MRK price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 7 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 ADDED — — — 219,095,465 +4,218,865 +2.0% 0.39% $23.06B 2026-02-14 (Est.) $120.52
2025 Q3 REDUCED — — — 214,876,600 -3,464,232 -1.6% 0.32% $18.03B 2025-11-12 $90.01
2025 Q2 REDUCED — — — 218,340,832 -7,057,399 -3.1% 0.33% $17.28B 2025-08-12 $78.26
2025 Q1 ADDED — — — 225,398,231 +3,316,386 +1.5% 0.42% $20.23B 2025-05-02 $80.26
2024 Q4 ADDED — — — 222,081,845 +221,158,845 +23960.9% 0.45% $22.09B 2025-02-07 $83.50
2024 Q3 REDUCED 99.6% -12.7% ✅ 923,000 -211,136,737 -99.6% 0.00% $104.8M 2024-11-13 $93.48
2024 Q3 INITIATED — — — 212,059,737 — — 0.51% $24.08B 2024-11-13 $93.48

🏢 Other funds also holding MRK

As of 2026 Q1 — sorted by position size

Wallace Advisory Group, LLC 3Y 14.83% Radnor Capital Management, LLC 3Y 7Y 9.25% Clark & Stuart, Inc 8.41% Slocum, Gordon & Co LLP 7.73% CACTI ASSET MANAGEMENT LLC 3Y 7Y 4.7% Eliot Finkel Investment Counsel, LLC 3Y 7Y 4.07% Westend Capital Management, LLC 3Y 7Y 4.06% Boit C F David 3Y 3.75% Sivik Global Healthcare LLC 3Y 7Y 3.65% Employees Provident Fund Board 3.59%

FAQ About BlackRock, Inc. and MRK

These are the practical questions this page is built to answer before you even open the full history table.

How long has BlackRock, Inc. reported owning MRK?

BlackRock, Inc. reported MRK across 7 quarterly 13F filings, from 2024 Q3 through 2025 Q4.

What was the largest reported MRK position in BlackRock, Inc.'s portfolio?

The largest reported portfolio weight for MRK was 0.51% in 2024 Q3.

What is the latest reported MRK position on this page?

The most recent filing on this page is 2025 Q4, when BlackRock, Inc. reported 219,095,465 shares, equal to 0.39% of portfolio, with an estimated market value of $23.06B.

What does the chart on this MRK ownership page compare?

The chart compares BlackRock, Inc.'s quarterly MRK portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did BlackRock, Inc. time their MRK position?

Based on 13F filing dates vs. subsequent MRK price moves, BlackRock, Inc. correctly timed 1 out of 6 reported position changes (17%). The annualised alpha on MRK relative to SPY over the holding period was +8.9%.

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