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Michael Jon Brown

DXCM
EVP CHIEF LEGAL OFFICER · DEXCOM INC · CIK 0001899922
FILING MIX · LIFETIME21%/79%
BUYS
7
SELLS
27
TOTAL VALUE
$7.46M
COMPANIES
1
ACTIVE SINCE
Mar 2022
HOLDINGS NOW
106,353
AVG SELL PX
$87.25
TRADE KIND
SHOWING 34 / 34
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
21 backtested trades · 8 horizons · 16 pending
Forward-return performance of every backtestable P/S trade by Michael Jon Brown, 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
7d21+47.62%-0.37%-0.19%-0.18%-0.68%—
14d21+23.81%+1.17%+1.14%+0.03%+1.63%—
30d21+57.14%-3.97%+1.76%-5.74%-5.42%—
60d21+52.38%-3.83%+5.08%-8.91%-7.25%—
90d21(1 pending)+65.00%-8.22%+7.72%-15.94%-13.40%—
180d21(2 pending)+68.42%-15.63%+10.93%-26.56%-23.82%—
1y21(4 pending)+70.59%-17.35%+20.67%-38.02%-40.94%—
2y21(9 pending)+100.00%-45.99%+39.29%-86.02%-82.00%—
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
DXCM · 106,353 shares · as of Jun 15, 2026
034,48268,965103,447137,9292023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 7 buys / 27 sellsCOVERAGE · 18 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
1,700$75.55$128.4K106,353Jun 15, 2026Jun 17, 2026 ↗View →
DXCM
DEXCOM INC
SALE
EVP Chief Legal Compliance Off
1,451$71.90$104.3K108,053May 22, 2026May 27, 2026 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
1,700$59.91$101.8K109,504May 15, 2026May 19, 2026 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
1,700$63.04$107.2K111,204Apr 15, 2026Apr 16, 2026 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
1,700$64.85$110.2K112,904Mar 16, 2026Mar 18, 2026 ↗View →
DXCM
DEXCOM INC
SALE
EVP, Chief Legal Officer
23,325$68.10$1.59M114,604Mar 8, 2026Mar 10, 2026 ↗View →
DXCM
DEXCOM INC
PURCHASEGRANT
Stock grant
39,019——137,929Mar 8, 2026Mar 10, 2026 ↗View →
DXCM
DEXCOM INC
SALE
EVP, Chief Legal Officer
2,653$73.36$194.6K98,655Jan 29, 2026Feb 2, 2026 ↗View →
DXCM
DEXCOM INC
PURCHASEGRANT
Stock grant
7,123——101,308Jan 29, 2026Feb 2, 2026 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
500$80.29$40.1K94,102Aug 15, 2025Aug 18, 2025 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
500$86.03$43.0K94,602Jul 15, 2025Jul 17, 2025 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
500$82.80$41.4K95,102Jun 16, 2025Jun 18, 2025 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
10,000$84.28$842.8K95,602May 23, 2025May 28, 2025 ↗View →
DXCM
DEXCOM INC
SALE
EVP, Chief Legal Officer
13,000$70.38$914.9K105,602Mar 12, 2025Mar 14, 2025 ↗View →
DXCM
DEXCOM INC
PURCHASEGRANT
Stock grant
22,798——118,602Mar 8, 2025Mar 11, 2025 ↗View →
DXCM
DEXCOM INC
PURCHASEGRANT
Stock grant
29,922——95,804Mar 8, 2025Mar 11, 2025 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
686$70.00$48.0K65,636Aug 30, 2024Sep 3, 2024 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
652$69.55$45.3K66,249Jul 31, 2024Aug 1, 2024 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
659$114.29$75.3K66,901Jun 28, 2024Jun 28, 2024 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
652$119.24$77.7K67,560May 31, 2024May 31, 2024 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
629$126.25$79.4K68,212Apr 30, 2024May 2, 2024 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
2,524$140.02$353.4K68,782Mar 28, 2024Mar 29, 2024 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
100$140.73$14.1K68,682Mar 28, 2024Mar 29, 2024 ↗View →
DXCM
DEXCOM INC
SALE
EVP Chief Legal Officer
8,799$134.41$1.18M71,306Mar 12, 2024Mar 14, 2024 ↗View →
DXCM
DEXCOM INC
PURCHASEGRANT
Stock grant
21,711——80,105Mar 8, 2024Mar 11, 2024 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
1,170$115.42$135.0K58,394Dec 1, 2023Dec 4, 2023 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
900$113.64$102.3K61,106Dec 1, 2023Dec 4, 2023 ↗View →
DXCM
DEXCOM INC
SALE10b5-1
10b5-1 plan
1,542$114.43$176.5K59,564Dec 1, 2023Dec 4, 2023 ↗View →
DXCM
DEXCOM INC
SALE
EVP Chief Legal Officer
253$116.03$29.4K61,870Apr 3, 2023Apr 5, 2023 ↗View →
DXCM
DEXCOM INC
SALE
EVP Chief Legal Officer
2,409$114.07$274.8K63,073Apr 3, 2023Apr 5, 2023 ↗View →
DXCM
DEXCOM INC
SALE
EVP Chief Legal Officer
950$115.08$109.3K62,123Apr 3, 2023Apr 5, 2023 ↗View →
DXCM
DEXCOM INC
SALE
EVP Chief Legal Officer
4,812$111.40$536.1K65,482Mar 10, 2023Mar 14, 2023 ↗View →
DXCM
DEXCOM INC
PURCHASEGRANT
Stock grant
21,769$0.00$2270,294Mar 8, 2023Mar 10, 2023 ↗View →
DXCM
DEXCOM INC
PURCHASEGRANT
Stock grant
12,038$0.00$1212,038Mar 8, 2022Mar 10, 2022 ↗View →
Other insiders · DXCM
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About this filer
CIK 0001899922
ROLE
EVP Chief Legal Officer
PRIMARY
DXCM
COMPANIES
1
ACTIVE SINCE
Mar 2022
MARKETPEEL · /INSIDER/0001899922DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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