Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-19 · Built: 2026-10-19 · 中文

← United States · Coverage record

US · SEC FORM 4

Merck & Co., Inc.

MRK · NYSE · CIK 0000310158 · Healthcare · Drug Manufacturers—General

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

55 Form 4 transaction lines observed in the same window
17 sales · 38 option, withholding, award, gift or other lines

Last qualifying purchase2025-02-06 · THULIN INGE G · $250.0K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Smart Dalton E. IIISVP Fin. - Global Controller
○○○○○○
DeLuca Richard R.EVP&Pres, Merck Animal Heallth
○○▼▼▼▼
Maraldo David R.EVP & Pres. MMD
○○○▼
Larson Betty DEVP, Chief HR Officer
○○○○
Zachary JenniferEVP, General Counsel
○○○▼
Williams David MichaelEVP,Chief Info&Digital Officer
○○○▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 6 additional owner(s) remain in Form 4 evidence.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2025-02-06 · THULIN INGE G.

Recent Form 4 activity

0Purchases
35Sales
56Other Form 4 lines
45SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING17 sale line(s) · context only
OTHER38 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
28,271,750
Previous report
34,430,712
Avg daily volume
11,188,097
Days to cover
2.5

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2025-02-06THULIN INGE GPurchase (P)Common Stock2,833USD 88.25USD 250,000SEC filing ↗
2025-02-05BAKER DOUGLAS M JRPurchase (P)Common Stock15,000USD 88.50USD 1,327,500SEC filing ↗
2023-04-26Romanelli JosephPurchase (P)Common Stock3USD 113.68USD 341SEC filing ↗
2023-03-20Romanelli JosephPurchase (P)Common Stock136USD 105.47USD 14,344SEC filing ↗
2023-02-21Romanelli JosephPurchase (P)Common Stock11USD 109.20USD 1,201SEC filing ↗
2022-12-19Romanelli JosephPurchase (P)Common Stock7USD 109.04USD 763SEC filing ↗
2022-12-13Romanelli JosephPurchase (P)Common Stock56USD 110.96USD 6,214SEC filing ↗
2022-12-06Romanelli JosephPurchase (P)Common Stock30USD 109.39USD 3,282SEC filing ↗
2022-12-05Romanelli JosephPurchase (P)Common Stock107USD 109.54USD 11,721SEC filing ↗
2022-12-02Romanelli JosephPurchase (P)Common Stock59USD 109.67USD 6,471SEC filing ↗

Form 4 evidence

91 transaction lines in the latest 365-day window; 526 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-13Guindo ChirfiSale (S)Common Stock10,000USD 135.00USD 1,350,000SEC filing ↗
2026-08-12Zachary JenniferSale (S)Common Stock80,315USD 133.46USD 10,718,840SEC filing ↗
2026-08-12Zachary JenniferOption exercise / conversion (M)Common Stock54,927USD 109.78USD 6,029,637SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-13Guindo ChirfiSale (S)Common Stock10,000USD 135.00USD 1,350,000SEC filing ↗
2026-08-12Zachary JenniferSale (S)Common Stock80,315USD 133.46USD 10,718,840SEC filing ↗
2026-08-12Zachary JenniferOption exercise / conversion (M)Common Stock54,927USD 109.78USD 6,029,637SEC filing ↗
2026-08-12DeLuca Richard R.Sale (S)Common Stock11,699USD 131.63USD 1,539,963SEC filing ↗
2026-08-11DeLuca Richard R.Sale (S)Common Stock12,837USD 131.76USD 1,691,419SEC filing ↗
2026-08-10DeLuca Richard R.Sale (S)Common Stock20,784USD 130.43USD 2,710,857SEC filing ↗
2026-08-06DeLuca Richard R.Sale (S)Common Stock6,050USD 130.37USD 788,764SEC filing ↗
2026-08-06Guindo ChirfiSale (S)Common Stock15,000USD 131.00USD 1,965,000SEC filing ↗
2026-08-05Williams David MichaelSale (S)Common Stock52,847USD 128.77USD 6,805,108SEC filing ↗
2026-08-05Williams David MichaelOption exercise / conversion (M)Common Stock52,847USD 74.49USD 3,936,377SEC filing ↗
2026-08-05Maraldo David R.Sale (S)Common Stock18,706USD 128.72USD 2,407,836SEC filing ↗
2026-08-05Maraldo David R.Option exercise / conversion (M)Common Stock18,706USD 82.25USD 1,538,495SEC filing ↗
2026-05-02Smart Dalton E. IIIOption exercise / conversion (M)Common Stock383USD 112.16USD 42,957SEC filing ↗
2026-05-02Smart Dalton E. IIITax withholding (F)Common Stock132USD 112.16USD 14,805SEC filing ↗
2026-05-02Maraldo David R.Option exercise / conversion (M)Common Stock552USD 112.16USD 61,912SEC filing ↗
2026-05-02Maraldo David R.Tax withholding (F)Common Stock159USD 112.16USD 17,833SEC filing ↗
2026-04-30Smart Dalton E. IIIOption exercise / conversion (M)Common Stock464USD 110.95USD 51,481SEC filing ↗
2026-04-30Smart Dalton E. IIITax withholding (F)Common Stock159USD 110.95USD 17,641SEC filing ↗
2026-04-30Larson Betty DOption exercise / conversion (M)Common Stock11,350USD 110.95USD 1,259,282SEC filing ↗
2026-04-30Larson Betty DTax withholding (F)Common Stock5,143USD 110.95USD 570,616SEC filing ↗
2026-04-29Zachary JenniferOption exercise / conversion (M)Common Stock2,951USD 110.03USD 324,699SEC filing ↗
2026-04-29Zachary JenniferTax withholding (F)Common Stock1,454USD 110.03USD 159,984SEC filing ↗
2026-04-29Williams David MichaelOption exercise / conversion (M)Common Stock1,377USD 110.03USD 151,511SEC filing ↗
2026-04-29Williams David MichaelTax withholding (F)Common Stock679USD 110.03USD 74,710SEC filing ↗
2026-04-29Smart Dalton E. IIIOption exercise / conversion (M)Common Stock944USD 110.03USD 103,868SEC filing ↗
2026-04-29Smart Dalton E. IIITax withholding (F)Common Stock324USD 110.03USD 35,650SEC filing ↗
2026-04-29Oosthuizen Johannes JacobusOption exercise / conversion (M)Common Stock1,377USD 110.03USD 151,511SEC filing ↗
2026-04-29Oosthuizen Johannes JacobusTax withholding (F)Common Stock679USD 110.03USD 74,710SEC filing ↗
2026-04-29Litchfield CarolineOption exercise / conversion (M)Common Stock3,935USD 110.03USD 432,968SEC filing ↗
2026-04-29Litchfield CarolineTax withholding (F)Common Stock1,938USD 110.03USD 213,238SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-19
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerMRK
CIK0000310158
SectorHealthcare
IndustryDrug Manufacturers—General Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
ExchangeNYSE

Data coverage

Local Form 4 history526 transaction lines from 2020-01-13 to 2026-08-13
10 P purchase lines · 130 S sale lines · 386 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-19. Mapping status is an audit field and does not erase SEC filing evidence.