Tandem Diabetes Care
TNDM
16.11
+0.44
+2.78%
Tandem Diabetes Care
US · TNDM
#3179 by market cap
16.11
+0.44
+2.78%
Live - 5344 symbols - heartbeat 145s ago
· 2026-10-09 19:30
✦ Quant Ownership Signal how this is computed
Distributing
- The number of reporting institutions decreased by 2 in the most recent period (2026/Q3).
- Total institutional ownership fell 0.8 percentage points.
Institutional ownership
- Held by institutions
- 115.99% -0.81pp
- Institutions
- 333 -2
- As of
- 2026/Q3 vs. prior period
Ownership vs. money flow
AlignedInstitutions trimmed shares last reporting period, and the stock has seen net outflows in main-fund flow over the last 20 trading sessions - the two line up.
Institutional ownership changes are reported quarterly with a lag; fund-flow data is daily. Treat this as a directional cross-check, not a precise timing signal.
Holder types
Mutual Fund80.31%
Hedge Fund27.38%
Public Company4.04%
Sovereign Wealth Fund1.42%
Government Pension Fund1.40%
Private Company1.06%
Individual/Insider1.00%
Insurance Company0.29%
Top holders as of 2026-06-30
BlackRock
16.65% · 11.58M sh
Sessa Capital IM, L.P.
7.33% · 5.10M sh
Vanguard Portfolio Management, LLC
6.18% · 4.30M sh
Vanguard Capital Management, LLC
5.16% · 3.59M sh
First Light Asset Management, LLC
4.86% · 3.38M sh
State Street Global Advisors
4.10% · 2.85M sh
GW&K Investment Management, LLC
3.69% · 2.57M sh
Jennison Associates LLC
3.35% · 2.33M sh
Paradice Investment Management Pty Ltd.
2.91% · 2.02M sh
Jacobs Levy Equity Management Inc
2.88% · 2.01M sh
Bar length is relative to the largest holder shown here, not to 100% of the company.
Insiders
50 filings tracked · 36 buys · 14 sells
| Name | Role | Stake |
|---|---|---|
| John Sheridan | Chief Executive Officer | 0.23% |
| Leigh Vosseller | Chief Financial Officer | 0.11% |
| Susan Morrison | Executive Vice President | 0.08% |
| Dick Allen | Independent Director | 0.07% |
| Mark Novara | Executive Vice President | 0.06% |
| Christopher Twomey | Independent Director | 0.05% |
| Elizabeth Gasser | Chief Strategy Officer | 0.05% |
| Shannon Hansen | Chief Legal, Privacy & Compliance Officer and Secretary | 0.05% |
| Rick Carpenter | Chief Technology Officer | 0.05% |
| Jean-Claude Kyrillos | Chief Operating Officer | 0.04% |
Insider transactions most recent Form 4 filings
| Date | Name | Role | Type | Shares | Price |
|---|---|---|---|---|---|
| 2026-09-16 | Mark Novara | Executive Vice President | Intent to Sell (Form 144) | -360 | $17.53 |
| 2026-08-17 | Mark Novara | Executive Vice President | Intent to Sell (Form 144) | -131 | $22.26 |
| 2026-08-14 | Jean-Claude Kyrillos | Chief Operating Officer | Derivative Exercise and Sale | -535 | $22.72 |
| 2026-08-14 | Jean-Claude Kyrillos | Chief Operating Officer | Derivative Exercise and Retained | +475 | -- |
| 2026-08-14 | Shannon Hansen | Chief Legal, Privacy & Compliance Officer and Secretary | Derivative Exercise and Sale | -1,535 | $22.72 |
| 2026-08-14 | Shannon Hansen | Chief Legal, Privacy & Compliance Officer and Secretary | Derivative Exercise and Retained | +1,479 | -- |
| 2026-08-14 | John Sheridan | Chief Executive Officer | Derivative Exercise and Sale | -8,099 | $22.72 |
| 2026-08-14 | John Sheridan | Chief Executive Officer | Derivative Exercise and Retained | +7,817 | -- |
| 2026-08-14 | Leigh Vosseller | Chief Financial Officer | Derivative Exercise and Sale | -1,479 | $22.72 |
| 2026-08-14 | Leigh Vosseller | Chief Financial Officer | Derivative Exercise and Retained | +2,641 | -- |
| 2026-08-14 | Rick Carpenter | Chief Technology Officer | Derivative Exercise and Sale | -1,277 | $22.72 |
| 2026-08-14 | Rick Carpenter | Chief Technology Officer | Derivative Exercise and Retained | +1,230 | -- |
| 2026-08-14 | Susan Morrison | Executive Vice President | Derivative Exercise and Sale | -809 | $22.72 |
| 2026-08-14 | Susan Morrison | Executive Vice President | Derivative Exercise and Retained | +2,018 | -- |
| 2026-08-14 | Elizabeth Gasser | Chief Strategy Officer | Derivative Exercise and Sale | -1,618 | $22.72 |
| 2026-08-14 | Elizabeth Gasser | Chief Strategy Officer | Derivative Exercise and Retained | +1,396 | -- |
| 2026-07-14 | Jean-Claude Kyrillos | Chief Operating Officer | Derivative Exercise and Sale | -1,926 | $15.28 |
| 2026-07-14 | Jean-Claude Kyrillos | Chief Operating Officer | Derivative Exercise and Retained | +1,710 | -- |
| 2026-06-16 | Mark Novara | Executive Vice President | Intent to Sell (Form 144) | -361 | $16.69 |
| 2026-06-01 | Elizabeth Gasser | Chief Strategy Officer | Other Acquisition | +7,160 | -- |
Form 4 filings, most recent per company. "Other Derivative Acquisition" rows are mostly RSU/option vesting, not open-market buying - the Type column says which.
Quote time 2026-10-09 19:30:06 · For reference only, not investment advice and not tailored to your situation.
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