SAMLYN CAPITAL, LLC MRK — MERCK & CO INC COM

Ownership history in SAMLYN CAPITAL, LLC  ·  27 quarters on record

AI Ownership Summary

SAMLYN CAPITAL, LLC reported MERCK & CO INC COM (MRK) in 27 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 1.49% in 2026 Q1. The latest visible filing shows MRK at 1.49% 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. Older history is available after unlock; the visible window still shows the most recent pattern.

What this MRK ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was SAMLYN CAPITAL, LLC's position in MERCK & CO INC COM, 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
2026 Q1

MRK was reported at 1.49% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
1.49% in 2026 Q1

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

Time in book
Holding Window
2023 Q4 to 2026 Q1

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 SAMLYN CAPITAL, LLC fund profile SAMLYN CAPITAL, LLC full holdings
How SAMLYN CAPITAL, LLC 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 5 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 ADDED — — — 726,481 +424,701 +140.7% 1.49% $87.4M 2026-05-15 $111.38
2024 Q3 ADDED — — — 301,780 +51,878 +20.8% 0.52% $34.3M 2024-11-14 $93.35
2024 Q2 REDUCED 43.3% -7.7% ✅ 249,902 -190,792 -43.3% 0.51% $30.9M 2024-08-14 $107.08
2024 Q1 REDUCED 19.4% -2.5% ✅ 440,694 -105,907 -19.4% 0.97% $58.1M 2024-05-15 $123.45
2023 Q4 REDUCED 41.2% +20.9% ❌ 546,601 -382,297 -41.2% 1.19% $59.6M 2024-02-14 $117.17
22 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 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% Atle Fund Management AB 3Y 7Y 7.4% SECTOR GAMMA AS 3Y 7Y 7.39% Bruce & Co., Inc. 3Y 7Y 6.63% Smead Capital Management, Inc. 3Y 7Y 6.47% Round Hill Asset Management 3Y 7Y 5.67% Adalta Capital Management LLC 3Y 7Y 5.13%

FAQ About SAMLYN CAPITAL, LLC and MRK

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

How long has SAMLYN CAPITAL, LLC reported owning MRK?

SAMLYN CAPITAL, LLC reported MRK across 5 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported MRK position in SAMLYN CAPITAL, LLC's portfolio?

The largest reported portfolio weight for MRK was 1.49% in 2026 Q1.

What is the latest reported MRK position on this page?

The most recent filing on this page is 2026 Q1, when SAMLYN CAPITAL, LLC reported 726,481 shares, equal to 1.49% of portfolio, with an estimated market value of $87.4M.

What does the chart on this MRK ownership page compare?

The chart compares SAMLYN CAPITAL, LLC'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 SAMLYN CAPITAL, LLC time their MRK position?

Based on 13F filing dates vs. subsequent MRK price moves, SAMLYN CAPITAL, LLC correctly timed 12 out of 26 reported position changes (46%). The annualised alpha on MRK relative to SPY over the holding period was +3.3%.

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