TNDM Insider Trading
TANDEM DIABETES CARE INC | Surgical & Medical Instruments & Apparatus
Comprehensive Trading Performance Summary
The investment history of corporate insiders at TANDEM DIABETES CARE INC provides a unique lens into the internal conviction of the company's leadership. By analyzing SEC Form 4 filings, investors can track how directors and officers are allocating their own capital. High-conviction buying often signals that management believes the current market price significantly undervalues future growth prospects, while strategic selling might occur for personal liquidity or portfolio diversification. Monitoring these shifts in ownership is essential for understanding the alignment between management and shareholders in the Surgical & Medical Instruments & Apparatus sector.
Transactions on Chart
Open Full Chart| Filing Date | Trade Date | Reporting Person | Relationship | Type | Price | Qty | Total, $ | Owned After | Change, % |
|---|---|---|---|---|---|---|---|---|---|
| 2019-06-04 23:46 | 2019-06-03 | BERGER DAVID B | Officer - EVP, Chief Legal & Compliance | OPT+S | $67.76 | 2,000 | $135,520 | 3,311 | 0.0% |
| 2019-05-17 23:44 | 2019-05-16 | Vosseller Leigh | Officer - EVP and CFO | OPT+S | $70.45 | 10,000 | $704,500 | 2,009 | 0.0% |
| 2019-05-07 00:33 | 2019-05-03 | Vosseller Leigh | Officer - EVP and CFO | OPT+S | $65.14 | 10,000 | $651,400 | 2,009 | 0.0% |
| 2019-05-07 00:26 | 2019-05-03 | BERGER DAVID B | Officer - EVP, Chief Legal & Compliance | OPT+S | $63.09 | 2,000 | $126,180 | 1,765 | 0.0% |
| 2019-05-04 00:30 | 2019-05-02 | Allen Dick | Director | SELL | $61.34 | 17,000 | $1,042,816 | 10,000 | -63.0% |
| 2019-04-04 23:09 | 2019-04-03 | BERGER DAVID B | Officer - EVP, GEN. COUNSEL & SECRETARY | OPT+S | $62.60 | 2,000 | $125,200 | 1,765 | 0.0% |
| 2019-03-16 02:07 | 2019-03-15 | HANSEN BRIAN B | Officer - EVP & CHIEF COMMERCIAL OFFICER | OPT+S | $72.00 | 10,000 | $720,000 | 1,381 | 0.0% |
| 2019-03-14 02:10 | 2019-03-11 | BLICKENSTAFF KIM D | Director, Officer - Executive Chairman | SELL | $64.95 | 200,000 | $12,990,440 | 991,750 | -16.8% |
| 2019-03-11 23:13 | 2019-03-08 | Allen Dick | Director | SELL | $62.58 | 17,539 | $1,097,631 | 14,000 | -55.6% |
| 2019-03-05 03:24 | 2019-03-01 | Morrison Susan | Officer - EVP & CAO | OPT+S | $67.79 | 60,000 | $4,067,370 | 3,745 | 0.0% |
| 2019-03-02 01:58 | 2019-02-28 | GREENE HOWARD E JR | Director | SELL | $65.39 | 10,000 | $653,884 | 40,000 | -20.0% |
| 2019-02-28 02:39 | 2019-02-27 | Sheridan John F | Officer - EVP, CHIEF OPERATING OFFICER | OPT+S | $62.03 | 20,000 | $1,240,556 | 666 | 0.0% |
| 2019-01-26 01:55 | 2019-01-25 | Sheridan John F | Officer - EVP, CHIEF OPERATING OFFICER | OPT+S | $45.26 | 20,000 | $905,178 | 666 | 0.0% |
| 2019-01-16 00:45 | 2019-01-15 | HANSEN BRIAN B | Officer - EVP & CHIEF COMMERCIAL OFFICER | OPT+S | $41.54 | 25,000 | $1,038,528 | 1,381 | 0.0% |
| 2019-01-10 01:19 | 2019-01-08 | BERGER DAVID B | Officer - EVP, GEN. COUNSEL & SECRETARY | OPT+S | $40.08 | 10,000 | $400,751 | 1,765 | 0.0% |
| 2019-01-04 00:19 | 2018-12-31 | Sheridan John F | Officer - EVP, CHIEF OPERATING OFFICER | OPT+S | $35.76 | 20,788 | $743,308 | 666 | 0.0% |
| 2018-12-14 03:30 | 2018-12-12 | HANSEN BRIAN B | Officer - EVP & CHIEF COMMERCIAL OFFICER | OPT+S | $37.75 | 25,000 | $943,750 | 1,381 | 0.0% |
| 2018-12-08 02:34 | 2018-12-06 | BERGER DAVID B | Officer - EVP, GEN. COUNSEL & SECRETARY | OPT+S | $34.54 | 11,493 | $396,991 | 200 | 0.0% |
| 2018-11-08 01:03 | 2018-11-05 | Valencia Richard P. | Director | BUY | $37.75 | 1,300 | $49,075 | 3,054 | +74.1% |
| 2018-11-08 01:02 | 2018-11-06 | GREENE HOWARD E JR | Director | SELL | $36.53 | 11,787 | $430,579 | 50,000 | -19.1% |
| 2018-11-08 01:01 | 2018-11-05 | Allen Dick | Director | SELL | $38.02 | 15,222 | $578,677 | 52,000 | -22.6% |
| 2018-11-08 01:02 | 2018-11-06 | BLICKENSTAFF KIM D | Director, Officer - PRESIDENT & CEO | SELL | $37.01 | 198,000 | $7,327,624 | 1,191,750 | -14.2% |
| 2018-08-04 00:04 | 2018-08-03 | Valencia Richard P. | Director | BUY | $28.50 | 1,754 | $49,989 | 1,754 | +100.0% |
| 2018-03-08 00:05 | 2018-03-06 | Allen Dick | Director | BUY | $3.88 | 25,539 | $99,216 | 22,001 | +100.0% |
| 2018-02-14 00:58 | 2018-02-09 | Allen Dick | Director | BUY | $2.00 | 60,000 | $120,000 | 13,898 | +100.0% |
| 2018-02-14 00:56 | 2018-02-09 | GREENE HOWARD E JR | Director | BUY | $2.00 | 50,000 | $100,000 | 61,787 | +424.2% |
| 2018-02-14 00:59 | 2018-02-09 | ROEDER DOUGLAS A | Director | BUY | $2.00 | 1,000,000 | $2,000,000 | 13,217 | +100.0% |
| 2018-02-14 00:54 | 2018-02-09 | TWOMEY CHRISTOPHER J | Director | BUY | $2.00 | 75,000 | $150,000 | 26,758 | +100.0% |
| 2018-02-14 00:52 | 2018-02-09 | BLICKENSTAFF KIM D | Director, Officer - PRESIDENT & CEO | BUY | $2.00 | 750,000 | $1,500,000 | 1,236,494 | +154.2% |
| 2017-10-18 01:54 | 2017-10-13 | BLICKENSTAFF KIM D | Director, Officer - PRESIDENT & CEO | BUY | $3.50 | 285,700 | $999,950 | 486,494 | +142.3% |
| 2017-03-24 03:28 | 2017-03-23 | BLICKENSTAFF KIM D | Director, Officer - PRESIDENT & CEO | BUY | $1.25 | 1,600,000 | $2,000,000 | 2,007,939 | +392.2% |
| 2016-08-04 01:38 | 2016-08-01 | Sheridan John F | Officer - EVP, CHIEF OPERATING OFFICER | OPT+S | $6.52 | 15,000 | $97,800 | 7,763 | 0.0% |
| 2016-05-02 23:50 | 2016-05-02 | Sheridan John F | Officer - EVP, CHIEF OPERATING OFFICER | OPT+S | $10.61 | 2,000 | $21,213 | 5,295 | 0.0% |
| 2016-04-23 00:32 | 2016-04-22 | Sheridan John F | Officer - EVP, CHIEF OPERATING OFFICER | OPT+S | $10.00 | 2,000 | $20,000 | 5,295 | 0.0% |
| 2016-03-10 02:40 | 2016-03-07 | Sheridan John F | Officer - EVP, CHIEF OPERATING OFFICER | OPT+S | $10.01 | 4,000 | $40,026 | 5,295 | 0.0% |
| 2016-03-10 02:39 | 2016-01-04 | Sheridan John F | Officer - EVP, CHIEF OPERATING OFFICER | OPT+S | $11.47 | 2,000 | $22,944 | 5,295 | 0.0% |
| 2016-03-01 01:32 | 2016-02-26 | Allen Dick | Director | BUY | $8.24 | 10,000 | $82,439 | 131,598 | +8.2% |
| 2016-01-06 01:19 | 2016-01-04 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $11.47 | 2,000 | $22,944 | 3,295 | 0.0% |
| 2015-12-03 00:13 | 2015-12-01 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $10.14 | 2,000 | $20,280 | 4,084 | 0.0% |
| 2015-11-04 02:11 | 2015-11-02 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $10.00 | 4,000 | $40,000 | 4,084 | 0.0% |
| 2015-09-16 22:58 | 2015-09-14 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $12.51 | 2,000 | $25,020 | 4,084 | 0.0% |
| 2015-08-07 23:13 | 2015-08-05 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $12.45 | 35,000 | $435,589 | 4,084 | 0.0% |
| 2015-08-04 23:40 | 2015-08-03 | GREENE HOWARD E JR | Director | SELL | $12.70 | 20,000 | $254,038 | 117,865 | -14.5% |
| 2015-05-01 23:46 | 2015-05-01 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $13.72 | 2,000 | $27,436 | 2,235 | 0.0% |
| 2015-04-04 00:03 | 2015-04-01 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $12.47 | 2,000 | $24,939 | 2,235 | 0.0% |
| 2015-03-05 02:06 | 2015-03-02 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $11.76 | 2,000 | $23,513 | 2,235 | 0.0% |
| 2015-02-04 02:28 | 2015-02-02 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $12.06 | 2,000 | $24,127 | 2,235 | 0.0% |
| 2015-01-06 00:51 | 2015-01-02 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $12.75 | 2,000 | $25,501 | 2,235 | 0.0% |
| 2014-12-16 01:03 | 2014-12-12 | Allen Dick | Director | BUY | $11.95 | 10,000 | $119,504 | 121,598 | +9.0% |
| 2014-12-03 02:32 | 2014-12-01 | Sheridan John F | Officer - EVP & CHIEF OPERATING OFFICER | OPT+S | $13.55 | 2,000 | $27,096 | 2,235 | 0.0% |
How to Interpret $TNDM Trades
Not every insider transaction in TANDEM DIABETES CARE INC is a signal for immediate action. Professional investors look for "cluster buying"—when multiple executives simultaneously purchase $TNDM shares on the open market. It is crucial to distinguish between scheduled sales (under Rule 10b5-1) and voluntary increases in ownership, which demonstrate management’s true conviction that the stock is undervalued.
Data Source & Accuracy for TNDM
Insider activity data for TANDEM DIABETES CARE INC is streamed in real-time directly from the SEC EDGAR system. We analyze raw Form 4 filings, filtering out technical adjustments and complex derivative transactions. This provides a transparent view of how ownership structure is evolving in $TNDM, allowing you to follow the capital of those with the most intimate knowledge of the company.
UNDERSTANDING THE DATA
FILING DATE: The date and time when the transaction was reported to the SEC. This is when the public first receives the information.
TRADE DATE: The actual day the insider executed the purchase or sale in the market.
INDUSTRY: The specific market sector the company operates in. Useful for identifying broader institutional capital flows across sectors.
OWNED AFTER: The total number of shares held by the insider following the transaction. This highlights the insider's remaining conviction in the company.
CHANGE %: The percentage increase or decrease of the insider's total position. Large percentage changes often carry more weight than the dollar amount alone.
TRADE TYPES DEFINITIONS
BUY: An open market purchase. Typically indicates an insider's belief that the stock is undervalued or poised for growth.
SELL: An open market sale. While often used for diversification or liquidity, large or unexpected sales can be a warning signal.
OPT+S (OPTION EXERCISE & SALE): This occurs when an insider exercises their stock options and sells them immediately. Often part of a structured compensation plan.