MarketPeel
Insider Trading Intelligence
Pricing
…
DR

Douglas A. Roeder

TNDM
DIRECTOR · TANDEM DIABETES CARE INC · CIK 0001270735
FILING MIX · LIFETIME72%/28%
BUYS
36
SELLS
14
TOTAL VALUE
$24.94M
COMPANIES
2
ACTIVE SINCE
May 2020
HOLDINGS NOW
159,443
AVG SELL PX
$2.29
TRADE KIND
SHOWING 50 / 50
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
15 backtested trades · 8 horizons · 13 pending
Forward-return performance of every backtestable P/S trade by Douglas A. Roeder, 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
7d15+73.33%-0.11%-0.10%+0.22%+4.74%—
14d15+60.00%+12.57%+0.03%+12.72%+3.06%—
30d15+78.57%+23.97%-0.65%+24.55%+12.41%—
60d15(1 pending)+50.00%+55.86%+2.32%+53.54%+43.96%—
90d15(1 pending)+57.14%+31.35%+2.57%+28.78%+35.27%—
180d15(2 pending)+46.15%+22.79%+5.46%+17.33%+19.41%—
1y15(3 pending)+66.67%-30.41%+6.92%-37.34%-36.47%—
2y15(6 pending)+88.89%-68.74%+7.17%-75.91%-76.61%—
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
TNDM · 2,205 shares · as of May 18, 2022
0248,056496,111744,167992,22220212022SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
2026
FLOW · 36 buys / 14 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
2,751$5.36$14.7K157,238Jul 1, 2026Jul 2, 2026 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
13,574——13,574May 20, 2026May 21, 2026 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
9,852——154,487May 20, 2026May 21, 2026 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASE
22,686$5.56$126.1K144,635May 12, 2026May 13, 2026 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
2,218$6.65$14.7K121,949Apr 1, 2026Apr 2, 2026 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASE
17,500$5.73$100.3K119,731Mar 13, 2026Mar 16, 2026 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
2,504$5.89$14.7K102,231Jan 2, 2026Jan 5, 2026 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASE
15,000$5.83$87.5K99,727Nov 7, 2025Nov 10, 2025 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
35,714$0.41$14.7K1,694,540Oct 1, 2025Oct 3, 2025 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
30,987$0.48$14.7K1,658,826Jul 1, 2025Jul 3, 2025 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
111,386——1,627,839May 23, 2025May 28, 2025 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
157,234——157,234May 23, 2025May 28, 2025 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
22,183$0.66$14.7K1,516,453Apr 1, 2025Apr 3, 2025 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
31,183$0.47$14.7K1,494,270Jan 2, 2025Jan 3, 2025 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASE
25,000$0.50$12.5K1,413,087Dec 13, 2024Dec 16, 2024 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASE
75,000$0.50$37.5K1,463,087Dec 13, 2024Dec 20, 2024 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASE
300,000$0.41$123.0K1,388,087Dec 12, 2024Dec 16, 2024 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
43,755$0.34$14.7K1,088,087Oct 1, 2024Oct 2, 2024 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
236,344——1,044,332May 22, 2024May 24, 2024 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASE
300,000$0.54$162.0K807,988Aug 30, 2023Aug 31, 2023 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
200,000$0.75$150.0K507,988Jun 9, 2023Jun 13, 2023 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
147,948——307,988May 17, 2023May 19, 2023 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
99,557——160,040May 26, 2022May 31, 2022 ↗View →
TNDM
TANDEM DIABETES CARE INC
PURCHASE
2,205——0May 18, 2022May 19, 2022 ↗View →
TNDM
TANDEM DIABETES CARE INC
PURCHASE
2,205——2,205May 18, 2022May 19, 2022 ↗View →
TNDM
TANDEM DIABETES CARE INC
PURCHASE
11,568——13,460Oct 15, 2021Oct 20, 2021 ↗View →
TNDM
TANDEM DIABETES CARE INC
PURCHASE
3,766——3,766Oct 15, 2021Oct 20, 2021 ↗View →
TNDM
TANDEM DIABETES CARE INC
SALE
11,568——1,892Oct 15, 2021Oct 20, 2021 ↗View →
TNDM
TANDEM DIABETES CARE INC
SALE
1,000,000——0Oct 15, 2021Oct 20, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
86,930——0Aug 25, 2021Aug 26, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
215,747$3.50$755.1K60,483Aug 25, 2021Aug 26, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASE
86,930$1.97$171.3K276,230Aug 25, 2021Aug 26, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
128,817——0Aug 25, 2021Aug 26, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASE
128,817$1.35$173.9K189,300Aug 25, 2021Aug 26, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
125,342$3.65$457.5K60,483Aug 24, 2021Aug 26, 2021 ↗View →
TNDM
TANDEM DIABETES CARE INC
SALE
1,892——0Jun 23, 2021Jun 25, 2021 ↗View →
TNDM
TANDEM DIABETES CARE INC
PURCHASE
1,892——992,222Jun 23, 2021Jun 25, 2021 ↗View →
TNDM
TANDEM DIABETES CARE INC
PURCHASE
1,892——1,892May 27, 2021Jun 1, 2021 ↗View →
TNDM
TANDEM DIABETES CARE INC
SALE
1,892——0May 27, 2021Jun 1, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
60,483——185,825May 25, 2021May 28, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
147,735$1.91$282.2K125,342May 25, 2021May 28, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
652$2.08$1.4K0May 19, 2021May 20, 2021 ↗View →
TNDM
TANDEM DIABETES CARE INC
PURCHASEGRANT
Stock grant
2,205——2,205May 18, 2021May 20, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
47,580$2.12$100.9K652Apr 12, 2021Apr 13, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
4,906,326$2.12$10.40M0Apr 12, 2021Apr 13, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
46,989$2.39$112.2K48,232Apr 9, 2021Apr 13, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
SALE
4,845,399$2.39$11.57M4,845,399Apr 9, 2021Apr 13, 2021 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
273,077——273,077Jul 20, 2020Jul 22, 2020 ↗View →
SENS
SENSEONICS HOLDINGS, INC.
PURCHASEGRANT
Stock grant
273,077——273,077Jul 20, 2020Aug 20, 2020 ↗View →
TNDM
TANDEM DIABETES CARE INC
PURCHASEGRANT
Stock grant
1,892——1,892May 27, 2020May 29, 2020 ↗View →
Other insiders · TNDM
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About this filer
CIK 0001270735
ROLE
Director
PRIMARY
TNDM
COMPANIES
2
ACTIVE SINCE
May 2020
MARKETPEEL · /INSIDER/0001270735DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

The morning brief, before the bell.

One short email. Insider buys, congressional trades, and plain-English analysis.

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