Joseph J. Hartnett - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Joseph J. Hartnett has filed 1 SEC Form 4 filing across 1 company in the last 90 days - selling. Lifetime open-market sales: $169K.
Profile
Joseph J. Hartnett is a corporate insider at GARMIN LTD (GRMN). Hartnett has reported 3 insider filings with the SEC since 2025. The most recent filing was in June 2026.
| Role | Insider |
|---|---|
| Notability | 20/100 |
Board memberships
- GARMIN LTD
Trading Pattern
InsiderAlpha's records for Joseph J. Hartnett go back to 2025: 2 primary Form 4 filings, an average of 1.0 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Career & Filing History
Every role Joseph J. Hartnett has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- Insider at GARMIN LTD (GRMN) - 2 filings, 2025 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-09 | GRMN | GARMIN LTD | S - Open-market sale | 643 | $263.57 | $169K |
| 2026-06-09 | GRMN | GARMIN LTD | F - Tax withholding / forfeiture | 215 | $236.57 | $51K |
| 2026-06-09 | GRMN | GARMIN LTD | A - Grant or award | 753 | $0.00 | |
| 2025-06-06 | GRMN | GARMIN LTD | F - Tax withholding / forfeiture | 273 | $207.45 | $57K |
| 2025-06-06 | GRMN | GARMIN LTD | A - Grant or award | 858 | $0.00 |
Companies - Last 90 Days
- GARMIN LTD (GRMN) - 1 filing, last 2026-06-09
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Joseph J. Hartnett has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- Clifton A. Pemble - $8.37M of GRMN open-market activity in the last 12 months
- Patrick Desbois - $2.46M of GRMN open-market activity in the last 12 months
- Cheng-Wei Wang - $2.37M of GRMN open-market activity in the last 12 months
- Douglas G. Boessen - $1.97M of GRMN open-market activity in the last 12 months
- Matthew Munn - $1.32M of GRMN open-market activity in the last 12 months
- Susan Lyman - $956K of GRMN open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Andrew T. Kaplan
- A. J. Kazimi
- Michael John Kazley
- Kennedy Lewis Investment Holdings II LLC
- KENNEDY LEWIS MANAGEMENT LP
- James M. Kilts
- Richard D. Kinder
- Steven B. Klinsky
Frequently Asked Questions
Who is Joseph J. Hartnett?
Joseph J. Hartnett is a corporate insider at GARMIN LTD (GRMN). Hartnett has reported 3 insider filings with the SEC since 2025. The most recent filing was in June 2026.…
How many SEC Form 4 filings has Joseph J. Hartnett submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Joseph J. Hartnett been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($169K) across all tracked filings.
Where can I see all of Joseph J. Hartnett's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live Joseph J. Hartnett profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.