TANDEM DIABETES CARE INC (TNDM)
$21.16-$0.24 (-1.12%) Today
John F. Sheridan - OfficerJohn F. Sheridan - OfficerTandem Diabetes designs, manufactures, and markets durable insulin pumps for individuals with diabetes. The firm first entered this market in 2012 and has since introduced multiple generations of pumps leading to its current t:slim X2 device. The firm recently launched its smaller Mobi pump and continues to work on the Sigi tubeless patch pump. Tandem is also developing a fully closed-loop algorithm for its pumps. Nearly three-quarters of total revenue is derived from the US, with the remainder primarily from other developed nations. The pumps themselves generate just over half of total sales, and another one-third is from disposable infusion sets that need to be changed over every 3 to 7 days.
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Grant or award | 7 | 396,307 | |
| Option exercise | 28 | 72,088 | |
| Tax withholding / forfeiture | 14 | 17,278 | |
| Bona-fide gift | 2 | 14,320 |
Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
78 Form 4 filings on record, the earliest from Nov 19, 2024, newest first. Filing history page 1 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Leigh Vosseller - Officer | Option exercise | Common Stock | 1,496 | $0.00 | - | |
| Leigh Vosseller - Officer | Tax withholding / forfeiture | Common Stock | 537 | $22.72 | $12K | |
| Leigh Vosseller - Officer | Option exercise | Common Stock | 2,624 | $0.00 | - | |
| Leigh Vosseller - Officer | Tax withholding / forfeiture | Common Stock | 942 | $22.72 | $21K | |
| Leigh Vosseller - Officer | Option exercise | Restricted Stock Unit | 1,496 | $0.00 | - | |
| Leigh Vosseller - Officer | Option exercise | Restricted Stock Unit | 2,624 | $0.00 | - | |
| John F. Sheridan - Officer | Option exercise | Common Stock | 5,982 | $0.00 | - | |
| John F. Sheridan - Officer | Tax withholding / forfeiture | Common Stock | 3,044 | $22.72 | $69K | |
| John F. Sheridan - Officer | Option exercise | Common Stock | 9,934 | $0.00 | - | |
| John F. Sheridan - Officer | Tax withholding / forfeiture | Common Stock | 5,055 | $22.72 | $115K | |
| John F. Sheridan - Officer | Option exercise | Restricted Stock Unit | 5,982 | $0.00 | - | |
| John F. Sheridan - Officer | Option exercise | Restricted Stock Unit | 9,934 | $0.00 | - | |
| Susan Morrison - Officer | Option exercise | Common Stock | 1,097 | $0.00 | - | |
| Susan Morrison - Officer | Tax withholding / forfeiture | Common Stock | 314 | $22.72 | $7K | |
| Susan Morrison - Officer | Option exercise | Common Stock | 1,730 | $0.00 | - | |
| Susan Morrison - Officer | Tax withholding / forfeiture | Common Stock | 495 | $22.72 | $11K | |
| Susan Morrison - Officer | Option exercise | Restricted Stock Unit | 1,097 | $0.00 | - | |
| Susan Morrison - Officer | Option exercise | Restricted Stock Unit | 1,730 | $0.00 | - | |
| Jean-Claude Kyrillos - Officer | Option exercise | Common Stock | 1,010 | $0.00 | - | |
| Jean-Claude Kyrillos - Officer | Tax withholding / forfeiture | Common Stock | 535 | $22.72 | $12K | |
| Jean-Claude Kyrillos - Officer | Option exercise | Restricted Stock Unit | 1,010 | $0.00 | - | |
 Elizabeth Anne Gasser - Officer | Option exercise | Common Stock | 1,097 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Tax withholding / forfeiture | Common Stock | 589 | $22.72 | $13K | |
| Elizabeth Anne Gasser - Officer | Option exercise | Common Stock | 1,917 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Tax withholding / forfeiture | Common Stock | 1,029 | $22.72 | $23K | |
| Elizabeth Anne Gasser - Officer | Option exercise | Restricted Stock Unit | 1,097 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Option exercise | Restricted Stock Unit | 1,917 | $0.00 | - | |
| Rick Carpenter - Officer | Option exercise | Common Stock | 897 | $0.00 | - | |
| Rick Carpenter - Officer | Tax withholding / forfeiture | Common Stock | 457 | $22.72 | $10K | |
| Rick Carpenter - Officer | Option exercise | Common Stock | 1,610 | $0.00 | - | |
| Rick Carpenter - Officer | Tax withholding / forfeiture | Common Stock | 820 | $22.72 | $19K | |
| Rick Carpenter - Officer | Option exercise | Restricted Stock Unit | 897 | $0.00 | - | |
| Rick Carpenter - Officer | Option exercise | Restricted Stock Unit | 1,610 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Option exercise | Common Stock | 1,097 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Tax withholding / forfeiture | Common Stock | 559 | $22.72 | $13K | |
| Shannon Marie Hansen - Officer | Option exercise | Common Stock | 1,917 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Tax withholding / forfeiture | Common Stock | 976 | $22.72 | $22K | |
| Shannon Marie Hansen - Officer | Option exercise | Restricted Stock Unit | 1,097 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Option exercise | Restricted Stock Unit | 1,917 | $0.00 | - | |
| Jean-Claude Kyrillos - Officer | Option exercise | Common Stock | 3,636 | $0.00 | - | |
| Jean-Claude Kyrillos - Officer | Tax withholding / forfeiture | Common Stock | 1,926 | $15.28 | $29K | |
| Jean-Claude Kyrillos - Officer | Option exercise | Restricted Stock Unit | 3,636 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Gift | Common Stock | 7,160 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Gift | Common Stock | 7,160 | $0.00 | - | |
| John F. Sheridan - Officer | Grant or award | Restricted Stock Unit | 191,103 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Grant or award | Restricted Stock Unit | 29,136 | $0.00 | - | |
| Leigh Vosseller - Officer | Grant or award | Restricted Stock Unit | 62,657 | $0.00 | - | |
| Jean-Claude Kyrillos - Officer | Grant or award | Restricted Stock Unit | 29,136 | $0.00 | - | |
| Susan Morrison - Officer | Grant or award | Restricted Stock Unit | 29,136 | $0.00 | - | |
| Rick Carpenter - Officer | Grant or award | Restricted Stock Unit | 26,003 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Grant or award | Restricted Stock Unit | 29,136 | $0.00 | - | |
 Dick Allen | Option exercise | Common Stock | 8,759 | $0.00 | - | |
| Dick Allen | Grant or award | Restricted Stock Unit | 10,220 | $0.00 | - | |
| Dick Allen | Option exercise | Restricted Stock Unit | 8,759 | $0.00 | - | |
| Peyton R. Howell - Director | Grant or award | Restricted Stock Unit | 10,220 | $0.00 | - | |
| Peyton R. Howell - Director | Option exercise | Common Stock | 8,759 | $0.00 | - | |
| Peyton R. Howell - Director | Option exercise | Restricted Stock Unit | 8,759 | $0.00 | - | |
| Joao Paulo Falcao Malagueira - Director | Option exercise | Common Stock | 8,759 | $0.00 | - | |
| Joao Paulo Falcao Malagueira - Director | Grant or award | Restricted Stock Unit | 10,220 | $0.00 | - | |
| Joao Paulo Falcao Malagueira - Director | Option exercise | Restricted Stock Unit | 8,759 | $0.00 | - | |
| Sandra Beaver - Director | Grant or award | Restricted Stock Unit | 5,110 | $0.00 | - | |
| Rajwant Sodhi - Director | Option exercise | Common Stock | 8,759 | $0.00 | - | |
| Rajwant Sodhi - Director | Grant or award | Restricted Stock Unit | 10,220 | $0.00 | - | |
| Rajwant Sodhi - Director | Option exercise | Restricted Stock Unit | 8,759 | $0.00 | - | |
 Kathleen McGroddy-Goetz - Director | Option exercise | Common Stock | 8,759 | $0.00 | - | |
| Kathleen McGroddy-Goetz - Director | Grant or award | Restricted Stock Unit | 10,220 | $0.00 | - | |
| Kathleen McGroddy-Goetz - Director | Option exercise | Restricted Stock Unit | 8,759 | $0.00 | - | |
| Rebecca B. Robertson - Director | Option exercise | Common Stock | 8,759 | $0.00 | - | |
| Rebecca B. Robertson - Director | Grant or award | Restricted Stock Unit | 10,220 | $0.00 | - | |
| Rebecca B. Robertson - Director | Option exercise | Restricted Stock Unit | 8,759 | $0.00 | - | |
| Christopher J. Twomey - Director | Option exercise | Common Stock | 8,759 | $0.00 | - | |
| Christopher J. Twomey - Director | Grant or award | Restricted Stock Unit | 10,220 | $0.00 | - | |
| Christopher J. Twomey - Director | Option exercise | Restricted Stock Unit | 8,759 | $0.00 | - | |
| Myoungil Cha - Director | Option exercise | Common Stock | 8,759 | $0.00 | - | |
| Myoungil Cha - Director | Grant or award | Restricted Stock Unit | 10,220 | $0.00 | - | |
| Myoungil Cha - Director | Option exercise | Restricted Stock Unit | 8,759 | $0.00 | - | |
| Rick Carpenter - Officer | Option exercise | Common Stock | 1,437 | $0.00 | - | |
| Rick Carpenter - Officer | Option exercise | Common Stock | 898 | $0.00 | - | |
| Rick Carpenter - Officer | Option exercise | Common Stock | 6,439 | $0.00 | - | |
| Rick Carpenter - Officer | Tax withholding / forfeiture | Common Stock | 732 | $12.82 | $9K | |
| Rick Carpenter - Officer | Tax withholding / forfeiture | Common Stock | 457 | $12.82 | $6K | |
| Rick Carpenter - Officer | Tax withholding / forfeiture | Common Stock | 3,277 | $12.82 | $42K | |
| Rick Carpenter - Officer | Grant or award | Common Stock | 1,336 | $10.90 | $15K | |
| Rick Carpenter - Officer | Option exercise | Restricted Stock Unit | 1,437 | $0.00 | - | |
| Rick Carpenter - Officer | Option exercise | Restricted Stock Unit | 898 | $0.00 | - | |
| Rick Carpenter - Officer | Option exercise | Restricted Stock Unit | 6,439 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Option exercise | Common Stock | 1,503 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Option exercise | Common Stock | 1,097 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Option exercise | Common Stock | 7,667 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Tax withholding / forfeiture | Common Stock | 807 | $12.82 | $10K | |
| Elizabeth Anne Gasser - Officer | Tax withholding / forfeiture | Common Stock | 589 | $12.82 | $8K | |
| Elizabeth Anne Gasser - Officer | Tax withholding / forfeiture | Common Stock | 4,114 | $12.82 | $53K | |
| Elizabeth Anne Gasser - Officer | Grant or award | Common Stock | 1,337 | $10.90 | $15K | |
| Elizabeth Anne Gasser - Officer | Option exercise | Restricted Stock Unit | 1,503 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Option exercise | Restricted Stock Unit | 1,097 | $0.00 | - | |
| Elizabeth Anne Gasser - Officer | Option exercise | Restricted Stock Unit | 7,667 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Option exercise | Restricted Stock Unit | 1,437 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Option exercise | Restricted Stock Unit | 1,097 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Option exercise | Restricted Stock Unit | 7,667 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Option exercise | Common Stock | 1,437 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Option exercise | Common Stock | 1,097 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Option exercise | Common Stock | 7,667 | $0.00 | - | |
| Shannon Marie Hansen - Officer | Tax withholding / forfeiture | Common Stock | 732 | $12.82 | $9K | |
| Shannon Marie Hansen - Officer | Tax withholding / forfeiture | Common Stock | 559 | $12.82 | $7K | |
| Shannon Marie Hansen - Officer | Tax withholding / forfeiture | Common Stock | 3,901 | $12.82 | $50K | |
| Shannon Marie Hansen - Officer | Grant or award | Common Stock | 1,886 | $10.90 | $21K | |
| Jean-Claude Kyrillos - Officer | Option exercise | Common Stock | 4,038 | $0.00 | - | |
| Jean-Claude Kyrillos - Officer | Tax withholding / forfeiture | Common Stock | 2,139 | $12.82 | $27K | |
| Jean-Claude Kyrillos - Officer | Grant or award | Common Stock | 434 | $10.90 | $5K | |
| Jean-Claude Kyrillos - Officer | Option exercise | Restricted Stock Unit | 4,038 | $0.00 | - | |
| Susan Morrison - Officer | Option exercise | Common Stock | 1,503 | $0.00 | - | |
| Susan Morrison - Officer | Option exercise | Common Stock | 1,097 | $0.00 | - | |
| Susan Morrison - Officer | Option exercise | Common Stock | 6,923 | $0.00 | - | |
| Susan Morrison - Officer | Tax withholding / forfeiture | Common Stock | 430 | $12.82 | $6K | |
| Susan Morrison - Officer | Tax withholding / forfeiture | Common Stock | 314 | $12.82 | $4K | |
| Susan Morrison - Officer | Tax withholding / forfeiture | Common Stock | 1,980 | $12.82 | $25K | |
| Susan Morrison - Officer | Grant or award | Common Stock | 1,336 | $10.90 | $15K | |
| Susan Morrison - Officer | Option exercise | Restricted Stock Unit | 1,503 | $0.00 | - | |
| Susan Morrison - Officer | Option exercise | Restricted Stock Unit | 1,097 | $0.00 | - | |
| Susan Morrison - Officer | Option exercise | Restricted Stock Unit | 6,923 | $0.00 | - |
A Form 144 is notice of an INTENDED sale, not a completed one. It often precedes the Form 4 that reports the trade actually happening.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| MARK NOVARA | Officer | 131 | $3K | View on EDGAR | |
| - | - | - | - | View on EDGAR | |
| - | - | - | - | View on EDGAR |
TANDEM DIABETES CARE INC (TNDM) had 16 insider filings in the last 90 days, with the most recent on 2026-08-18. The full record for TNDM runs to 78 Form 4 filings, the earliest from 2024-11-19. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
No insider purchases of TNDM were filed in the last 90 days. 3 purchases are on record for this company.
No insider sales of TNDM were filed in the last 90 days. 4 sales are on record for this company.
This page tracks TNDM Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
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