← United States · Coverage record
US · SEC FORM 4
TANDEM DIABETES CARE INC
TNDM · Nasdaq · CIK 0001438133 · Healthcare · Medical Devices
INSIDER SIGNAL
0 qualifying P purchase groups
in the current 180-day scoring window
86 Form 4 transaction lines observed in the same window
0 sales · 86 option, withholding, award, gift or other lines
WHY NO ACTIVE SIGNAL?
Score anatomy
No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.
Why is there no score?
- No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
- Sales and other Form 4 activity remain visible as context and do not create a negative score.
Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.
Insider activity timeline
Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.
Showing the six most active owners; 10 additional owner(s) remain in Form 4 evidence.
Purchase breadth, concentration & cluster buying
These modules activate when qualifying purchases enter the 180-day research window.
SIGNAL HISTORY
Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2025-08-11 · Sheridan John F.
Recent Form 4 activity
P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.
Market context
Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.
Short interest
Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.
- Shares short
- 13,369,091
- Previous report
- 12,474,385
- Avg daily volume
- 2,548,341
- Days to cover
- 5.2
FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.
Historical equity purchases
Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.
| Transaction date | Reporting owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2025-08-11 | Sheridan John F | Purchase (P) | Common Stock | 10,000 | USD 10.23 | USD 102,300 | SEC filing ↗ |
| 2025-08-08 | Vosseller Leigh | Purchase (P) | Common Stock | 13,720 | USD 10.89 | USD 149,411 | SEC filing ↗ |
| 2025-03-07 | Kyrillos Jean-Claude | Purchase (P) | Common Stock | 10,538 | USD 18.12 | USD 190,949 | SEC filing ↗ |
| 2024-11-15 | Novara Mark David | Purchase (P) | Common Stock | 532 | USD 23.24 | USD 12,364 | SEC filing ↗ |
| 2023-11-27 | Allen Dick | Purchase (P) | Common Stock | 5,000 | USD 18.96 | USD 94,800 | SEC filing ↗ |
| 2023-11-08 | Vosseller Leigh | Purchase (P) | Common Stock | 6,200 | USD 15.39 | USD 95,418 | SEC filing ↗ |
| 2023-11-08 | Hansen Shannon Marie | Purchase (P) | Common Stock | 1,935 | USD 15.44 | USD 29,876 | SEC filing ↗ |
| 2023-09-15 | McGroddy-Goetz Kathleen | Purchase (P) | Common Stock | 1,000 | USD 21.45 | USD 21,450 | SEC filing ↗ |
| 2023-05-18 | Allen Dick | Purchase (P) | Common Stock | 10,000 | USD 29.47 | USD 294,700 | SEC filing ↗ |
| 2023-05-17 | Howell Peyton R | Purchase (P) | Common Stock | 3,000 | USD 30.16 | USD 90,480 | SEC filing ↗ |
| 2023-05-12 | Vosseller Leigh | Purchase (P) | Common Stock | 3,015 | USD 32.77 | USD 98,802 | SEC filing ↗ |
| 2022-05-09 | Vosseller Leigh | Purchase (P) | Common Stock | 500 | USD 70.00 | USD 35,000 | SEC filing ↗ |
| 2022-05-09 | Sheridan John F | Purchase (P) | Common Stock | 2,500 | USD 69.90 | USD 174,750 | SEC filing ↗ |
| 2022-05-06 | Vosseller Leigh | Purchase (P) | Common Stock | 2,000 | USD 75.77 | USD 151,530 | SEC filing ↗ |
| 2022-05-06 | Howell Peyton R | Purchase (P) | Common Stock | 2,000 | USD 74.85 | USD 149,695 | SEC filing ↗ |
Form 4 evidence
159 transaction lines in the latest 365-day window; 1,305 in local history.
| Date | Owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2026-08-15 | Vosseller Leigh | Option exercise / conversion (M) | Common Stock | 4,120 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-08-15 | Vosseller Leigh | Tax withholding (F) | Common Stock | 1,479 | USD 22.72 | USD 33,603 | SEC filing ↗ |
| 2026-08-15 | Sheridan John F | Option exercise / conversion (M) | Common Stock | 15,916 | USD 0.00 | USD 0 | SEC filing ↗ |
Show recent Form 4 evidence (30 grouped rows)
| Date | Owner | Type | Security | Shares | Avg. price | Approx. value | Source |
|---|---|---|---|---|---|---|---|
| 2026-08-15 | Vosseller Leigh | Option exercise / conversion (M) | Common Stock | 4,120 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-08-15 | Vosseller Leigh | Tax withholding (F) | Common Stock | 1,479 | USD 22.72 | USD 33,603 | SEC filing ↗ |
| 2026-08-15 | Sheridan John F | Option exercise / conversion (M) | Common Stock | 15,916 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-08-15 | Sheridan John F | Tax withholding (F) | Common Stock | 8,099 | USD 22.72 | USD 184,009 | SEC filing ↗ |
| 2026-08-15 | Morrison Susan | Option exercise / conversion (M) | Common Stock | 2,827 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-08-15 | Morrison Susan | Tax withholding (F) | Common Stock | 809 | USD 22.72 | USD 18,380 | SEC filing ↗ |
| 2026-08-15 | Kyrillos Jean-Claude | Option exercise / conversion (M) | Common Stock | 1,010 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-08-15 | Kyrillos Jean-Claude | Tax withholding (F) | Common Stock | 535 | USD 22.72 | USD 12,155 | SEC filing ↗ |
| 2026-08-15 | Hansen Shannon Marie | Option exercise / conversion (M) | Common Stock | 3,014 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-08-15 | Hansen Shannon Marie | Tax withholding (F) | Common Stock | 1,535 | USD 22.72 | USD 34,875 | SEC filing ↗ |
| 2026-08-15 | Gasser Elizabeth Anne | Option exercise / conversion (M) | Common Stock | 3,014 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-08-15 | Gasser Elizabeth Anne | Tax withholding (F) | Common Stock | 1,618 | USD 22.72 | USD 36,761 | SEC filing ↗ |
| 2026-08-15 | Carpenter Rick | Option exercise / conversion (M) | Common Stock | 2,507 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-08-15 | Carpenter Rick | Tax withholding (F) | Common Stock | 1,277 | USD 22.72 | USD 29,013 | SEC filing ↗ |
| 2026-07-15 | Kyrillos Jean-Claude | Option exercise / conversion (M) | Common Stock | 3,636 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-07-15 | Kyrillos Jean-Claude | Tax withholding (F) | Common Stock | 1,926 | USD 15.28 | USD 29,429 | SEC filing ↗ |
| 2026-06-02 | Gasser Elizabeth Anne | Gift (G) | Common Stock | 7,160 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-21 | TWOMEY CHRISTOPHER J | Option exercise / conversion (M) | Common Stock | 8,759 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-21 | Sodhi Rajwant | Option exercise / conversion (M) | Common Stock | 8,759 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-21 | ROBERTSON REBECCA B | Option exercise / conversion (M) | Common Stock | 8,759 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-21 | McGroddy-Goetz Kathleen | Option exercise / conversion (M) | Common Stock | 8,759 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-21 | Malagueira Joao Paulo Falcao | Option exercise / conversion (M) | Common Stock | 8,759 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-21 | Howell Peyton R | Option exercise / conversion (M) | Common Stock | 8,759 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-21 | Cha Myoungil | Option exercise / conversion (M) | Common Stock | 8,759 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-21 | Allen Dick | Option exercise / conversion (M) | Common Stock | 8,759 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-15 | Vosseller Leigh | Option exercise / conversion (M) | Common Stock | 13,495 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-15 | Vosseller Leigh | Tax withholding (F) | Common Stock | 4,843 | USD 12.82 | USD 62,087 | SEC filing ↗ |
| 2026-05-15 | Vosseller Leigh | Award / grant (A) | Common Stock | 1,336 | USD 10.90 | USD 14,562 | SEC filing ↗ |
| 2026-05-15 | Sheridan John F | Option exercise / conversion (M) | Common Stock | 51,189 | USD 0.00 | USD 0 | SEC filing ↗ |
| 2026-05-15 | Sheridan John F | Tax withholding (F) | Common Stock | 24,773 | USD 12.82 | USD 317,590 | SEC filing ↗ |
Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.
Snapshot & identity
| Snapshot date | 2026-10-18 |
|---|---|
| Ranking version | US-v1.2 |
| Data quality | PASS ELIGIBLE · — |
| Ticker | TNDM |
| CIK | 0001438133 |
| Sector | Healthcare |
| Industry | Medical Devices Yahoo Finance |
| SEC SIC | 3841 Surgical & Medical Instruments & Apparatus |
| Exchange | Nasdaq |
Data coverage
| Local Form 4 history | 1,305 transaction lines from 2020-01-16 to 2026-08-15 21 P purchase lines · 235 S sale lines · 1,049 other lines |
|---|---|
| SEC company submissions | Open SEC filings ↗ |
Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.