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Merck & Co., Inc.

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13F filer, CIK 310158, RAHWAY, NJ

Merck & Co., Inc. reported $228,030,003 across 13 holdings for the quarter ended 2025-09-30, in a 13F-HR filed 2025-11-12. Its ten largest share positions make up 99.76% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0000310158-25-000063

Period
2025-09-30
Reported value
$228M
Holdings
13
Top 10 weight
99.76%
New
0
Sold out
0

Part of the filer group Merck & Co., Inc.

How groups are built

Holdings, Q3 2025

Share positions as resolved from 13F-HR 0000310158-25-000063, largest first. % of portfolio is the value over $228,030,003, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
PSNLPERSONALIS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 14,044,943 shares; 2025Q1: 14,044,943 shares; 2025Q2: 14,044,943 shares; 2025Q3: 14,044,943 shares 14,044,943$91.6M40.16%0Timeline
MRNAMODERNA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 2,308,190 shares; 2025Q1: 2,308,190 shares; 2025Q2: 2,308,190 shares; 2025Q3: 2,308,190 shares 2,308,190$59.6M26.15%0Timeline
KYMRKYMERA THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 772,165 shares; 2025Q1: 772,165 shares; 2025Q2: 772,165 shares; 2025Q3: 772,165 shares 772,165$43.7M19.17%0Timeline
ALECALECTOR INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 3,545,719 shares; 2025Q1: 3,545,719 shares; 2025Q2: 3,545,719 shares; 2025Q3: 3,545,719 shares 3,545,719$10.5M4.6%0Timeline
ENTRADA THERAPEUTICS INCENTRADA THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 1,739,768 shares; 2025Q1: 1,739,768 shares; 2025Q2: 1,739,768 shares; 2025Q3: 1,739,768 shares 1,739,768$10.1M4.43%0
EVAXION BIOTECH A/SEVAXION BIOTECH A/SQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 542,279 shares; 2025Q1: 1,214,126 shares; 2025Q2: 1,214,126 shares; 2025Q3: 1,214,126 shares 1,214,126$4.57M2%0
SUTRO BIOPHARMA INCSUTRO BIOPHARMA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 2,723,509 shares; 2025Q1: 2,723,509 shares; 2025Q2: 2,723,509 shares; 2025Q3: 2,723,509 shares 2,723,509$2.37M1.04%0
VRDNVIRIDIAN THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 93,414 shares; 2025Q1: 93,414 shares; 2025Q2: 93,414 shares; 2025Q3: 93,414 shares 93,414$2.02M0.88%0Timeline
LAVA THERAPEUTICS NVLAVA THERAPEUTICS NVQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 1,149,345 shares; 2025Q1: 1,149,345 shares; 2025Q2: 1,149,345 shares; 2025Q3: 1,149,345 shares 1,149,345$1.79M0.79%0
XLOXilio Therapeutics Inc.Quarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 1,483,758 shares; 2025Q1: 1,483,758 shares; 2025Q2: 1,483,758 shares; 2025Q3: 1,483,758 shares 1,483,758$1.25M0.55%0Timeline
CARMCARISMA THERAPEUTICS INC COMQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 1,473,240 shares; 2025Q1: 1,473,240 shares; 2025Q2: 1,473,240 shares; 2025Q3: 1,473,240 shares 1,473,240$404K0.18%0Timeline
NEUPNEUPHORIA THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: 10,027 shares; 2025Q1: 10,027 shares; 2025Q2: 10,027 shares; 2025Q3: 10,027 shares 10,027$118K0.05%0Timeline
HURATUHURA BIOSCIENCES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not loaded; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: 13,950 shares; 2025Q3: 13,950 shares 13,950$34.6K0.02%0Timeline

How Q3 2025 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0000310158-25-000063 base2025-11-12acceptance time not in the bulk data set