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WESTFIELD CAPITAL MANAGEMENT CO LP

Position in MRK — Merck & Co., Inc.

CIK 1177719 BOSTON, MA

Position in MRK

as of Jun 30, 2026 · filed Aug 12, 2026
Position Value
$6,848,664
+$1,688,103 QoQ
Shares Held
53,297
+24.2% QoQ
Ownership
0.002%
of shares outstanding
% of Portfolio
0.02%
of 13F equity value
Holder Rank
#901
of 3,778 holders
Holding Since
Mar 2020
20 quarters on record
Voting authority Sole 94% Shared 0% None 6%

Common Shares in MRK Over Time

Shares Held

Position Value (USD)

Position in Drug Manufacturers - General

Healthcare · as of Jun 30, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $691,252,397 across 8 Drug Manufacturers - General names. MRK ranks #4 (1.0% of the industry book) .

# Ticker Company Shares Value (USD) Open
4 MRK
Merck & Co., Inc.
This page
53,297 $6,848,664

All Filings in MRK

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20 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $6,848,664 53,297
2026-03-31 $5,160,561 42,901
2025-12-31 $5,636,883 53,552
2024-12-31 $10,538,214 105,933
2024-09-30 $13,305,370 117,166
2024-06-30 $12,343,850 99,708
2024-03-31 $12,379,021 93,816
2023-12-31 $9,552,986 87,626
2023-09-30 $8,938,119 86,820
2023-06-30 $9,392,630 81,399
2023-03-31 $8,139,792 76,509
2022-12-31 $6,569,682 59,213
2022-09-30 $4,766,914 55,352
2022-06-30 $5,152,107 56,511
2021-06-30 $422,991 5,439
2021-03-31 $658,965 8,548
2020-12-31 $856,363 10,469
2020-09-30 $6,179,694 74,499
2020-06-30 $6,866,056 88,789
2020-03-31 $7,472,717 97,124