By CapitalSnitch Research Desk · updated Oct 11, 2026 · data from SEC filings and official Congress disclosures
Insider activity at Tandem Diabetes Care Inc has been all selling for a year now: about $4,356 from one seller, and zero buyers at market prices.
Selling on its own is common and often pre-planned (10b5-1 plans, taxes, diversification), so it matters more when it is unusually heavy or broad.
TNDM also shows up in congressional disclosures: 4 reported trades from two lawmakers in two years. No open-market insider buying or selling in the last full quarter. Insiders bought in 2 of the last 7 full quarters. On the institutional side, 274 funds reported holding TNDM at the end of Q2 2026, and funds were split between buying and selling.
Are insiders buying or selling TNDM stock?
In the last 12 months Tandem Diabetes Care Inc insiders made open-market purchases worth about $0 and sales worth about $4,356. Data comes from SEC Form 4 filings, updated every 30 minutes on CapitalSnitch.
When was the last insider trade in TNDM?
The most recent open-market insider trade in TNDM was filed on 2026-03-18.
How many institutions own TNDM?
274 investment managers reported holding TNDM in SEC Form 13F filings for Q2 2026.
Has any member of Congress traded TNDM?
Yes. Members of Congress reported 4 trades in TNDM over the past two years. The full list is free on CapitalSnitch.
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Public-record data for research and education, not investment advice. Insider sales are often pre-planned (10b5-1).
Congress data: Data derived from public disclosures filed under the Ethics in Government Act and the STOCK Act, republished free for public transparency and news reporting. Disclosures may lag the trade by 45 days or more and show amounts only as ranges. This data may not be used for credit rating, loan underwriting, solicitation of money (political, charitable or other), direct-mail or commercial targeting (5 U.S.C. 13107).