Skip to main content

Parallax Volatility Advisers, L.P.

Position in MRK — Merck & Co., Inc.

CIK 1521001 San Francisco, CA

Position in MRK

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$14,916,408
+$757,794 QoQ
Shares Held
116,081
-1.4% QoQ
Ownership
0.005%
of shares outstanding
% of Portfolio
0.73%
of 13F equity value
Holder Rank
#601
of 3,778 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in MRK Over Time

Shares Held

Position Value (USD)

Derivatives in MRK

reported options exposure · as of Jun 30, 2026
CallValue
$3,829,300
CallShares
29,800
PutValue
$12,850,000
PutShares
100,000

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Drug Manufacturers - General

Healthcare · as of Jun 30, 2026

Parallax Volatility Advisers, L.P. holds $35,775,129 across 10 Drug Manufacturers - General names. MRK ranks #1 (41.7% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 MRK
Merck & Co., Inc.
This page
116,081 $14,916,408

All Filings in MRK

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $3,829,300 29,800
2026-06-30 $14,916,408 116,081
2026-06-30 $12,850,000 100,000
2026-03-31 $4,691,310 39,000
2026-03-31 $3,632,758 30,200
2026-03-31 $14,158,614 117,704
2025-12-31 $4,389,026 41,697
2025-12-31 $19,115,216 181,600
2025-12-31 $4,336,712 41,200
2025-09-30 $27,294,036 325,200
2025-09-30 $1,678,600 20,000
2025-06-30 $7,892,252 99,700
2025-06-30 $10,354,128 130,800
2025-06-30 $975,013 12,317
2025-03-31 $1,804,176 20,100
2025-03-31 $28,283,376 315,100
2024-12-31 $847,271 8,517
2024-12-31 $41,393,628 416,100
2024-12-31 $5,431,608 54,600
2024-09-30 $95,662,944 842,400
2024-09-30 $21,610,468 190,300
2024-06-30 $3,119,760 25,200
2024-06-30 $7,403,240 59,800
2024-03-31 $44,519,930 337,400
2024-03-31 $14,092,260 106,800
2023-12-31 $55,523,886 509,300
2023-12-31 $21,869,412 200,600
2023-09-30 $31,152,670 302,600
2023-09-30 $89,020,865 864,700
2023-06-30 $112,678,335 976,500
2023-06-30 $68,276,263 591,700
2023-03-31 $12,490,186 117,400
2023-03-31 $94,676,461 889,900
2022-12-31 $156,040,080 1,406,400
2022-12-31 $17,563,385 158,300
2022-09-30 $39,193,212 455,100
2022-09-30 $161,096,072 1,870,600
2022-06-30 $227,177,406 2,491,800
2022-06-30 $29,265,570 321,000
2022-03-31 $21,447,870 261,400
2022-03-31 $203,467,590 2,479,800
2021-12-31 $28,609,712 373,300
2021-12-31 $243,753,520 3,180,500
2021-09-30 $43,676,465 581,500
2021-09-30 $134,153,971 1,786,100
2021-06-30 $1,014,276 13,042
2021-06-30 $52,230,332 671,600
2021-06-30 $73,026,030 939,000
2021-03-31 $84,683,404 1,098,500
2021-03-31 $33,803,973 438,500