TNDMNasdaq · Surgical & Medical Instruments & Apparatus

TANDEM DIABETES CARE INC

Alert me on TNDM

Insider buys, 6 months

Congress trades, 6 months

Signals, 6 months

Six months

After each filing

Oct 12 Buy Rep. Gilbert Cisneros House

1 week

−0.8%S&P −1.2%

1 month

Result in13 trading days

3 months

Result in55 trading days

6 months

Result in118 trading days

Apr 7 Buy Rep. Gilbert Cisneros House

1 week

+6.8%S&P +3.5%

1 month

−4.5%S&P +8.2%

3 months

−20.6%S&P +11.5%

6 months

−18.1%S&P +15.6%

Mar 19 Sale Novara Mark David Insider

1 week

−5.3%S&P −2.0%

1 month

−13.8%S&P +7.7%

3 months

−37.9%S&P +13.8%

6 months

−31.5%S&P +16.3%

Mar 10 Sale Novara Mark David Insider

1 week

+9.3%S&P −0.9%

1 month

−10.1%S&P +0.7%

3 months

−19.5%S&P +9.1%

6 months

−12.7%S&P +13.2%

Oct 15, 2025 Buy Rep. Josh Gottheimer House

1 week

−4.1%S&P +1.7%

1 month

+21.7%S&P +1.7%

3 months

+31.9%S&P +5.0%

6 months

+38.9%S&P +7.9%

Show all 7

Apr 10, 2025 Sale Rep. Josh Gottheimer House

1 week

−3.9%S&P −3.8%

1 month

+35.6%S&P +9.9%

3 months

−10.9%S&P +16.9%

6 months

−18.7%S&P +24.9%

Apr 7, 2025 Buy Rep. Gilbert Cisneros House

1 week

+8.2%S&P +8.3%

1 month

+38.9%S&P +13.8%

3 months

−1.2%S&P +26.4%

6 months

−6.3%S&P +36.4%

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for TNDM

78 held · newest 578 held · newest 2

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See all 78 filings for TNDM

Aeon news and offers by email

New sources, new features and offers like our founding price. A few times a month at most. Stop any time.

Signal history

No signal for this ticker yet. A signal is written when insider buying here scores one dot or more.

Stakes

Jun 30, 2026 Schedule 13G, amended

Voya Financial, Inc.: 0.2%, 149,088 shares

Mar 31, 2026 Schedule 13G

Voya Financial, Inc.: 6.3%, 4,343,683 shares

Mar 31, 2026 Schedule 13G

Vanguard Capital Management: 5.2%, 3,553,772 shares

Mar 31, 2026 Schedule 13G

Vanguard Portfolio Management: 5.9%, 4,052,274 shares

Mar 13, 2026 Schedule 13G, amended

The Vanguard Group: 0%, 0 shares

Dec 31, 2025 Schedule 13G, amended

ArrowMark Colorado Holdings, LLC: 4.3%, 2,889,691 shares

Sep 30, 2025 Schedule 13G

ArrowMark Colorado Holdings, LLC: 5.5%, 3,691,198 shares

Schedule 13D is filed within 5 business days of crossing 5 percent by an investor who may seek to influence the company. Schedule 13G is filed by a passive holder, and a large institution has up to 45 days after the quarter end.

Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal

No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters

$50KQ4 2025

$50KQ1 2026

$50KQ2 2026

$50KQ3 2026

Unchanged from Q2 2026. Reported to the Senate each quarter by the firms it hires.Original report ↗

Read from LDA.gov between Sep 23, 2026 and Oct 20, 2026. Senate Office of Public Records cannot vouch for the data or analyses derived from these data after the data have been retrieved from LDA.gov.