MarketPeel
Insider Trading Intelligence
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JO

Johannes Jacobus Oosthuizen

MRK
PRESIDENT, U.S. MARKET · MERCK & CO., INC. · CIK 0001916310
FILING MIX · LIFETIME45%/55%
BUYS
28
SELLS
34
TOTAL VALUE
$16.90M
COMPANIES
1
ACTIVE SINCE
May 2022
HOLDINGS NOW
31,044
AVG SELL PX
$105.98
TRADE KIND
SHOWING 62 / 62
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
7 backtested trades · 8 horizons · 4 pending
Forward-return performance of every backtestable P/S trade by Johannes Jacobus Oosthuizen, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d7+71.43%-0.01%+1.04%-1.05%-2.15%—
14d7+28.57%+2.49%+2.10%+0.39%+0.05%—
30d7+28.57%+4.14%+1.51%+2.63%+1.96%—
60d7+28.57%+6.42%-0.01%+6.43%+5.64%—
90d7+28.57%+3.83%+6.44%-2.61%-3.71%—
180d7(1 pending)+33.33%+11.58%+10.51%+1.07%+7.95%—
1y7(1 pending)+16.67%+6.83%+19.48%-12.65%-12.14%—
2y7(2 pending)+40.00%+0.28%+55.82%-55.54%-53.99%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
MRK · 31,044 shares · as of May 5, 2026
016,02232,04348,06564,0872023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 28 buys / 34 sellsCOVERAGE · 17 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
10,605——10,605May 5, 2026May 7, 2026 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
31,044——31,044May 5, 2026May 7, 2026 ↗View →
MRK
MERCK & CO., INC.
SALE
EVP, Oncology & Int?l
1,377——2,755Apr 29, 2026May 1, 2026 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
EVP, Oncology & Int?l
1,377$110.03$151.5K22,574.389Apr 29, 2026May 1, 2026 ↗View →
MRK
MERCK & CO., INC.
SALE
EVP, Oncology & Int?l
679$110.03$74.7K21,895.389Apr 29, 2026May 1, 2026 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
15,000$121.87$1.83M21,197.389Feb 6, 2026Feb 6, 2026 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
5,026$107.40$539.8K36,197.389Jan 26, 2026Jan 28, 2026 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
4,132——4,132Apr 29, 2025May 1, 2025 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
18,807——18,807Apr 29, 2025May 1, 2025 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
8,500$84.09$714.7K30,705.474Feb 19, 2025Feb 20, 2025 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
13,002$87.28$1.13M45,609.474Feb 8, 2025Feb 11, 2025 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
6,404$87.28$558.9K39,205.474Feb 8, 2025Feb 11, 2025 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
13,002——0Feb 8, 2025Feb 11, 2025 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
8,664$97.94$848.6K32,607.474Jan 27, 2025Jan 29, 2025 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
450$127.51$57.4K23,820.949May 4, 2024May 6, 2024 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
912$127.51$116.3K24,270.949May 4, 2024May 6, 2024 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
912——0May 4, 2024May 6, 2024 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
20,508——20,508Apr 30, 2024May 2, 2024 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
18,959$127.18$2.41M23,327.345Feb 2, 2024Feb 5, 2024 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
7,119——14,240Feb 2, 2024Feb 5, 2024 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
6,773——0Feb 2, 2024Feb 5, 2024 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
7,045——7,049Feb 2, 2024Feb 5, 2024 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
7,119$87.10$620.1K42,286.345Feb 2, 2024Feb 5, 2024 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
6,773$75.36$510.4K28,122.345Feb 2, 2024Feb 5, 2024 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
7,045$73.73$519.4K35,167.345Feb 2, 2024Feb 5, 2024 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
3,133$119.43$374.2K21,349.345Jan 22, 2024Jan 24, 2024 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
2,081$102.38$213.1K18,190.657Nov 9, 2023Nov 13, 2023 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
451$102.82$46.4K20,271.657Oct 30, 2023Oct 31, 2023 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
915$102.82$94.1K20,722.657Oct 30, 2023Oct 31, 2023 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
915——0Oct 30, 2023Oct 31, 2023 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
907——912May 4, 2023May 5, 2023 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
907$118.22$107.2K20,206.748May 4, 2023May 5, 2023 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
447$118.22$52.8K19,759.748May 4, 2023May 5, 2023 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
20,747——20,747May 2, 2023May 4, 2023 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
427$115.47$49.3K19,299.748May 1, 2023May 3, 2023 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
866$115.47$100.0K19,726.748May 1, 2023May 3, 2023 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
866——0May 1, 2023May 3, 2023 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
2,091$109.88$229.8K18,821.881Jan 23, 2023Jan 25, 2023 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
1,795$103.21$185.3K16,730.881Nov 9, 2022Nov 10, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
45,561$99.47$4.53M18,525.881Nov 7, 2022Nov 7, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
13,540——57,041.881Nov 7, 2022Nov 7, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
13,540——6,773Nov 7, 2022Nov 7, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
17,455——0Nov 7, 2022Nov 7, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
7,045——14,094Nov 7, 2022Nov 7, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
17,455——43,501.881Nov 7, 2022Nov 7, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
14,703——26,046.881Nov 7, 2022Nov 7, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
14,703——0Nov 7, 2022Nov 7, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
7,045——64,086.881Nov 7, 2022Nov 7, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
450$100.77$45.3K11,343.881Oct 30, 2022Nov 1, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
President, U.S. Market
913$100.77$92.0K11,793.881Oct 30, 2022Nov 1, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
913——915Oct 30, 2022Nov 1, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
President, U.S. Market
3,633$100.21$364.1K10,880.881Oct 28, 2022Nov 1, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
SVP, U.S. Market
907$87.10$79.0K14,960.881May 4, 2022May 5, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
SVP, U.S. Market
907——1,819May 4, 2022May 5, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
SVP, U.S. Market
447$87.10$38.9K14,513.881May 4, 2022May 5, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
SVP, U.S. Market
773$87.65$67.8K14,434.881May 3, 2022May 4, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
SVP, U.S. Market
773——0May 3, 2022May 4, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASEGRANT
Stock grant
21,359——21,359May 3, 2022May 5, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
SVP, U.S. Market
381$87.65$33.4K14,053.881May 3, 2022May 4, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
SVP, U.S. Market
866——866May 1, 2022May 3, 2022 ↗View →
MRK
MERCK & CO., INC.
PURCHASE
SVP, U.S. Market
866$88.69$76.8K14,088.881May 1, 2022May 3, 2022 ↗View →
MRK
MERCK & CO., INC.
SALE
SVP, U.S. Market
427$88.69$37.9K13,661.881May 1, 2022May 3, 2022 ↗View →
Other insiders · MRK
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About this filer
CIK 0001916310
ROLE
President, U.S. Market
PRIMARY
MRK
COMPANIES
1
ACTIVE SINCE
May 2022
MARKETPEEL · /INSIDER/0001916310DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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