Merck & Co., Inc. PSNL — PERSONALIS INC

Ownership history in Merck & Co., Inc.  ·  6 quarters on record

AI Ownership Summary

Merck & Co., Inc. reported PERSONALIS INC (PSNL) in 6 quarterly 13F filings from 2024 Q4 through 2026 Q1. Peak portfolio weight reached 42.73% in 2025 Q2. The latest visible filing shows PSNL at 25.60% 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 PSNL ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Merck & Co., Inc.'s position in PERSONALIS 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
2026 Q1

PSNL was reported at 25.60% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
42.73% in 2025 Q2

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

Time in book
Holding Window
2024 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.

PSNL stock page Merck & Co., Inc. fund profile Merck & Co., Inc. full holdings
How Merck & Co., Inc. held PSNL — position size vs. price
% of Fund (quarterly)    PSNL price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 6 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 UNCHANGED — — — 14,044,943 — 0% 25.60% $89.5M 2026-05-13 $6.39
2025 Q4 UNCHANGED — — — 14,044,943 — 0% 40.47% $111.8M 2026-02-17 $8.57
2025 Q3 UNCHANGED — — — 14,044,943 — 0% 40.16% $91.6M 2025-11-12 $8.01
2025 Q2 UNCHANGED — — — 14,044,943 — 0% 42.73% $92.1M 2025-08-13 $4.83
2025 Q1 UNCHANGED — — — 14,044,943 — 0% 30.01% $49.3M 2025-05-14 $4.82
2024 Q4 INITIATED — — — 14,044,943 — — 31.46% $81.2M 2025-02-14 $5.51

🏢 Other funds also holding PSNL

As of 2026 Q1 — sorted by position size

Blue Water Life Science Advisors, LP 3Y 8.56% Lightspeed Management Company, L.L.C. 5.26% AIGH Capital Management LLC 3Y 2.52% PERKINS CAPITAL MANAGEMENT INC 3Y 7Y 1.43% NANO CAP NEW MILLENNIUM GROWTH FUND L P 1.4% Casdin Capital, LLC 3Y 7Y 0.77% PFM Health Sciences, LP 3Y 7Y 0.51% Wellington Shields & Co., LLC 3Y 7Y 0.47% Bruce & Co., Inc. 3Y 7Y 0.42% Green Alpha Advisors, LLC 3Y 0.42%

FAQ About Merck & Co., Inc. and PSNL

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

How long has Merck & Co., Inc. reported owning PSNL?

Merck & Co., Inc. reported PSNL across 6 quarterly 13F filings, from 2024 Q4 through 2026 Q1.

What was the largest reported PSNL position in Merck & Co., Inc.'s portfolio?

The largest reported portfolio weight for PSNL was 42.73% in 2025 Q2.

What is the latest reported PSNL position on this page?

The most recent filing on this page is 2026 Q1, when Merck & Co., Inc. reported 14,044,943 shares, equal to 25.60% of portfolio, with an estimated market value of $89.5M.

What does the chart on this PSNL ownership page compare?

The chart compares Merck & Co., Inc.'s quarterly PSNL 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.

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