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MRK · Merck & Co., Inc.

Healthcare · +0.5% on Oct 16

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Updated Oct 17 · 9 feeds behind: FDA drug approvals, 1 day, and 8 more · Every feed →

On this page

The market view

Price chart

The interactive MRK chart (by TradingView) loads here.

Our take

8 rules fired on MRK

In short: none of these rules has solid or some evidence yet, so they show no clear lean on MRK.

How each did in past tests, against similar stocks over 3 months. Past results don't predict future ones.

All 8 rules
The 0–100 score for MRK, and which of these rules are open on it right now
Members see one number for how strongly these rules agree on MRK, and the day each rule fired. Better-tested rules count more, and so do different kinds of filings that point the same way.
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Compare with this company’s history

Is disclosure activity unusual?

See how many different insiders or members of Congress reported purchases or sales of MRK. Each bar covers 28 days, by disclosure date. Several trades by one person count once in each group and period.

Latest period: Sep 21, 2026–Oct 18, 2026 · UTC dates · today is excluded

Congress sales

Within earlier range

This count falls within the range of the 12 earlier comparable periods in this view.

Latest 28 days
1
Earlier median
0
Earlier range
0–1
Distinct filers per 28 daysScale: 0–1
Oct 20, 2025Oct 18, 2026
Earlier periodsLatest 28 daysEarlier median 0

Who appears in the latest period?

Up to three filers; one example disclosure each.

Inspect this period’s filings

The history behind this view

First stored company disclosure: Jul 1, 2015. Newest disclosure across this feed: Oct 15, 2026.

Earlier periods in the comparison: 12. Outlined periods are missing data, so they are left out of the comparison. The chart scale changes with the category.

Exact counts, dates and filings for all four categories
Insider purchases · Short history

Only 1 earlier period is on file to compare with. We need at least 6 full periods before calling a count unusual. Earlier median: 0; range: 0–0.

Insider purchases: distinct filers in stored disclosures
Period and filingsFilersHistory
Oct 20, 2025–Nov 16, 2025—Unavailable
Nov 17, 2025–Dec 14, 2025—Unavailable
Dec 15, 2025–Jan 11, 2026—Unavailable
Jan 12, 2026–Feb 8, 2026—Unavailable
Feb 9, 2026–Mar 8, 2026—Unavailable
Mar 9, 2026–Apr 5, 2026—Unavailable
Apr 6, 2026–May 3, 2026—Unavailable
May 4, 2026–May 31, 2026—Unavailable
Jun 1, 2026–Jun 28, 2026—Unavailable
Jun 29, 2026–Jul 26, 2026—Unavailable
Jul 27, 2026–Aug 23, 20260Partial; excluded
Aug 24, 2026–Sep 20, 20260Within stored history
Sep 21, 2026–Oct 18, 2026Latest period0Within stored history
Insider sales · Short history

Only 1 earlier period is on file to compare with. We need at least 6 full periods before calling a count unusual. Earlier median: 0; range: 0–0.

Insider sales: distinct filers in stored disclosures
Period and filingsFilersHistory
Oct 20, 2025–Nov 16, 2025—Unavailable
Nov 17, 2025–Dec 14, 2025—Unavailable
Dec 15, 2025–Jan 11, 2026—Unavailable
Jan 12, 2026–Feb 8, 2026—Unavailable
Feb 9, 2026–Mar 8, 2026—Unavailable
Mar 9, 2026–Apr 5, 2026—Unavailable
Apr 6, 2026–May 3, 2026—Unavailable
May 4, 2026–May 31, 2026—Unavailable
Jun 1, 2026–Jun 28, 2026—Unavailable
Jun 29, 2026–Jul 26, 2026—Unavailable
Jul 27, 2026–Aug 23, 20265Partial; excluded
Aug 24, 2026–Sep 20, 20260Within stored history
Sep 21, 2026–Oct 18, 2026Latest period0Within stored history
Congress purchases · Within earlier range

This count falls within the range of the 12 earlier comparable periods in this view. Earlier median: 0; range: 0–1.

Congress purchases: distinct filers in stored disclosures
Period and filingsFilersHistory
Oct 20, 2025–Nov 16, 20250Within stored history
Nov 17, 2025–Dec 14, 20251Within stored history
Dec 15, 2025–Jan 11, 20261Within stored history
Jan 12, 2026–Feb 8, 20260Within stored history
Feb 9, 2026–Mar 8, 20261Within stored history
Mar 9, 2026–Apr 5, 20260Within stored history
Apr 6, 2026–May 3, 20260Within stored history
May 4, 2026–May 31, 20260Within stored history
Jun 1, 2026–Jun 28, 20260Within stored history
Jun 29, 2026–Jul 26, 20260Within stored history
Jul 27, 2026–Aug 23, 20260Within stored history
Aug 24, 2026–Sep 20, 20261Within stored history
Sep 21, 2026–Oct 18, 2026Latest period0Within stored history
Congress sales · Within earlier range

This count falls within the range of the 12 earlier comparable periods in this view. Earlier median: 0; range: 0–1.

Congress sales: distinct filers in stored disclosures
Period and filingsFilersHistory
Oct 20, 2025–Nov 16, 20250Within stored history
Nov 17, 2025–Dec 14, 20251Within stored history
Dec 15, 2025–Jan 11, 20261Within stored history
Jan 12, 2026–Feb 8, 20260Within stored history
Feb 9, 2026–Mar 8, 20260Within stored history
Mar 9, 2026–Apr 5, 20260Within stored history
Apr 6, 2026–May 3, 20260Within stored history
May 4, 2026–May 31, 20260Within stored history
Jun 1, 2026–Jun 28, 20260Within stored history
Jun 29, 2026–Jul 26, 20261Within stored history
Jul 27, 2026–Aug 23, 20260Within stored history
Aug 24, 2026–Sep 20, 20260Within stored history
Sep 21, 2026–Oct 18, 2026Latest period1Within stored history
How to read this comparison

The median is the middle count in up to 12 earlier, non-overlapping 28-day periods; the range runs from the smallest to the largest count. The latest period is excluded from both. A comparison needs at least 6 earlier periods, including 3 with activity. The feed’s latest disclosure must be within 7 days of the current period’s end. This freshness check does not verify complete collection.

Insiders include individuals and reporting entities; only purchase and sale codes enter this view. Congress counts reporting members, including their disclosed family transactions. The same filer can appear in purchases and sales, so these categories should not be added into a net count.

These are stored disclosures, not a complete measure of trading. Reporting delays and collection gaps can change the comparison. More activity does not identify a motive or predict a stock’s return.

Company timeline

What has been happening?

May 1, 2026–Oct 16, 2026. Select a month in a category to inspect its records.

Company filings

Insiders

Public officials

FDA & trials

Owners & lobbying

All 38 records in this snapshot
  1. Filed
  2. Record date
  3. Disclosed
    Maria Elvira Salazar · Sale (partial)

    Transaction dated Sep 24, 2026

  4. Record date
  5. Record date
  6. Record date
  7. Record date
  8. Disclosed
    Maria Elvira Salazar · Purchase

    Transaction dated Aug 19, 2026

  9. Disclosed
    Chirfi Guindo · Sale

    Transaction dated Aug 13, 2026

  10. Disclosed
    Jennifer Zachary · Sale

    Transaction dated Aug 12, 2026

  11. Filed
  12. Filed
  13. Filed
  14. Disclosed
    Richard R. DeLuca · Sale

    Transaction dated Aug 12, 2026

  15. Disclosed
    Richard R. DeLuca · Sale

    Transaction dated Aug 10, 2026

  16. Disclosed
    Richard R. DeLuca · Sale

    Transaction dated Aug 11, 2026

  17. Disclosed
    Richard R. DeLuca · Sale

    Transaction dated Aug 11, 2026

  18. Disclosed
    Richard R. DeLuca · Sale

    Transaction dated Aug 12, 2026

  19. Filed
  20. Filed
  21. Disclosed
    Richard R. DeLuca · Sale

    Transaction dated Aug 6, 2026

  22. Disclosed
    Richard R. DeLuca · Sale

    Transaction dated Aug 6, 2026

  23. Disclosed
    Richard R. DeLuca · Sale

    Transaction dated Aug 6, 2026

  24. Disclosed
    Chirfi Guindo · Sale

    Transaction dated Aug 6, 2026

  25. Record date
  26. Disclosed
    David Michael Williams · Sale

    Transaction dated Aug 5, 2026

  27. Disclosed
    David Michael Williams · Sale

    Transaction dated Aug 5, 2026

  28. Disclosed
    David Michael Williams · Sale

    Transaction dated Aug 5, 2026

  29. Disclosed
    David R. Maraldo · Sale

    Transaction dated Aug 5, 2026

  30. Disclosed
    David R. Maraldo · Sale

    Transaction dated Aug 5, 2026

  31. Disclosed
    David R. Maraldo · Sale

    Transaction dated Aug 5, 2026

  32. Disclosed
    Alan Armstrong · Sale

    Transaction dated Mar 27, 2026

  33. Record date
  34. Filed
  35. Filed
  36. Filed
  37. Disclosed
    Donald J Trump · Purchase

    Transaction dated Mar 17, 2026

  38. Record date

Month counts include every record on file. The lists show the newest records on this page. A dash means none on file that month. Trades use disclosure dates; contract dates follow the source record. Nearby events do not establish the cause of a price move.

Who's buying and selling · last 90 days

Congress

1 member bought, 2 sold · 2 Rep

  1. ▼ SELLMaria Elvira Salazar Rep · House · FLMRK Merck & Co., Inc.$1K–$15Kdisclosed Oct 1 · filed 7 days after the trade
  2. ▲ BUYMaria Elvira Salazar Rep · House · FLMRK Merck & Co., Inc.$15K–$50Kdisclosed Sep 1 · filed 13 days after the trade 1 rule fired
  3. ▼ SELLAlan Armstrong Rep · Senate · OKMRK Merck & Co., Inc.$15K–$50Kdisclosed Jul 21 · filed 116 days after the trade · late
See every Congress trade on MRK →

Company insiders

0 buys · 7 sells (17 filed lots) · $30M sold

  1. ▼ SELLChirfi Guindo EVP, Access, Policy & CommsMRK Merck & Co., Inc.$1.4Mdisclosed Aug 13 · filed the same day
  2. ▼ SELLJennifer Zachary EVP, General CounselMRK Merck & Co., Inc.$10.7Mdisclosed Aug 13 · filed 1 day after the trade
  3. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$79.2Kdisclosed Aug 12 · filed the same day
  4. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$2.7Mdisclosed Aug 12 · filed 2 days after the trade
  5. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$718Kdisclosed Aug 12 · filed 1 day after the trade
  6. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$973Kdisclosed Aug 12 · filed 1 day after the trade
  7. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$1.5Mdisclosed Aug 12 · filed the same day
  8. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$105Kdisclosed Aug 10 · filed 4 days after the trade
  9. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$644Kdisclosed Aug 10 · filed 4 days after the trade
  10. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$39.3Kdisclosed Aug 10 · filed 4 days after the trade
See every insider trade on MRK →

Filings & events

Company filings (8-K) 36

Events the company must report to the SEC within days — results, deals, departures, restatements.

What it files 8-Ks about

  • Quarterly or yearly results · item 2.029
  • Other events · item 8.015
  • Directors or officers joined, left or got new pay · item 5.023
  • Shareholder vote results · item 5.073
  • Closing or cutting part of the business · item 2.052

Filing red flags 24

Warning signs in the company's own SEC filings — going-concern doubts, control weaknesses, staff comment letters, late filings, restatements, Wells notices, clinical holds, dividend cuts.

FDA and clinical trials 351

Drug approvals, recalls, clinical-trial updates and FDA advisory meetings.

Lobbying 105

Lobbying reports filed with the Senate for the company.

$28.2M across 105 reports

Issues named in the most reports

  • Medicare/Medicaid 59
  • Health Issues 49
  • Taxation/Internal Revenue Code 31
  • Trade (domestic/foreign) 29
  • Chemicals/Chemical Industry 20

Planned insider sales (Form 144) 38

Notices insiders file before they sell certain shares, such as ones they got straight from the company.

9 in the last 90 days · 38 notices on file

The notices on file don't give the sale's size; each sale shows up under company insiders once it is reported.

5% owners (13D / 13G) 1

Investors who reported owning 5% or more — 13D for owners who may push for changes, 13G for owners who just hold.

Push for changes, or just hold?

  • 13G, just holds: 1 filing

Filed by Vanguard Capital Management LLC

Biggest named funds (13F)

The largest MRK holdings among the well-known funds whose quarterly 13F filings we read — opens here.

Every disclosed trade on MRK

  1. ▼ SELLMaria Elvira Salazar Rep · House · FLMRK Merck & Co., Inc.$1K–$15Kdisclosed Oct 1 · filed 7 days after the trade
  2. ▲ BUYMaria Elvira Salazar Rep · House · FLMRK Merck & Co., Inc.$15K–$50Kdisclosed Sep 1 · filed 13 days after the trade 1 rule fired
  3. ▼ SELLChirfi Guindo EVP, Access, Policy & CommsMRK Merck & Co., Inc.$1.4Mdisclosed Aug 13 · filed the same day
  4. ▼ SELLJennifer Zachary EVP, General CounselMRK Merck & Co., Inc.$10.7Mdisclosed Aug 13 · filed 1 day after the trade
  5. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$79.2Kdisclosed Aug 12 · filed the same day
  6. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$2.7Mdisclosed Aug 12 · filed 2 days after the trade
  7. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$718Kdisclosed Aug 12 · filed 1 day after the trade
  8. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$973Kdisclosed Aug 12 · filed 1 day after the trade
  9. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$1.5Mdisclosed Aug 12 · filed the same day
  10. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$105Kdisclosed Aug 10 · filed 4 days after the trade
  11. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$644Kdisclosed Aug 10 · filed 4 days after the trade
  12. ▼ SELLRichard R. DeLuca EVP&Pres, Merck Animal HeallthMRK Merck & Co., Inc.$39.3Kdisclosed Aug 10 · filed 4 days after the trade
  13. ▼ SELLDavid R. Maraldo EVP & Pres. MMDMRK Merck & Co., Inc.$1.2Mdisclosed Aug 7 · filed 2 days after the trade
  14. ▼ SELLDavid R. Maraldo EVP & Pres. MMDMRK Merck & Co., Inc.$812Kdisclosed Aug 7 · filed 2 days after the trade
  15. ▼ SELLDavid Michael Williams EVP,Chief Info&Digital OfficerMRK Merck & Co., Inc.$4.5Mdisclosed Aug 7 · filed 2 days after the trade
  16. ▼ SELLDavid Michael Williams EVP,Chief Info&Digital OfficerMRK Merck & Co., Inc.$592Kdisclosed Aug 7 · filed 2 days after the trade
  17. ▼ SELLDavid R. Maraldo EVP & Pres. MMDMRK Merck & Co., Inc.$346Kdisclosed Aug 7 · filed 2 days after the trade
  18. ▼ SELLDavid Michael Williams EVP,Chief Info&Digital OfficerMRK Merck & Co., Inc.$1.7Mdisclosed Aug 7 · filed 2 days after the trade
  19. ▼ SELLChirfi Guindo EVP, Access, Policy & CommsMRK Merck & Co., Inc.$2Mdisclosed Aug 7 · filed 1 day after the trade
  20. ▼ SELLAlan Armstrong Rep · Senate · OKMRK Merck & Co., Inc.$15K–$50Kdisclosed Jul 21 · filed 116 days after the trade · late
  21. ▲ BUYDonald J Trump PresidentMRK Merck & Co., Inc.$1K–$15Kdisclosed May 8 · filed 52 days after the trade · late
  22. ▲ BUYJosh Gottheimer Dem · House · NJMRK Merck & Co., Inc.$1K–$15Kdisclosed Mar 5 · filed 29 days after the trade 1 rule fired
  23. ▲ BUYGilbert Ray Cisneros Jr Dem · House · CAMRK Merck & Co., Inc.$1K–$15Kdisclosed Jan 9 · filed 21 days after the trade 1 rule fired
  24. ▼ SELLJulie Johnson Dem · House · TXMRK Merck & Co., Inc.$1K–$15Kdisclosed Jan 5 · filed 18 days after the trade
  25. ▲ BUYGilbert Ray Cisneros Jr Dem · House · CAMRK Merck & Co., Inc.$1K–$15Kdisclosed Dec 12, 2025 · filed 24 days after the trade 1 rule fired
See all 113 trades on MRK →
People & votes

Which members of Congress traded MRK, sponsored bills that touch it and voted on them — opens here.