James Brian Windsor - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
James Brian Windsor has filed 1 SEC Form 4 filing across 1 company in the last 90 days - buying. Lifetime open-market purchases: $26K.
Profile
James Brian Windsor is a corporate insider at Rein Therapeutics, Inc. (RNTX). Windsor has reported 3 insider filings with the SEC since 2024. The most recent filing was in May 2026.
| Role | President and Chief Executive Officer |
|---|---|
| Notability | 20/100 |
Board memberships
- Rein Therapeutics, Inc.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realised performance after each tracked open-market purchase.
| Total purchases tracked | 3 |
|---|
Trading Pattern
InsiderAlpha's records for James Brian Windsor go back to 2024: 3 primary Form 4 filings, an average of 1.0 per year. The typical open-market purchase is $9K (3 buys totaling $26K). The largest single buy on record is $25K of RNTX in 2026. 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 James Brian Windsor 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 Rein Therapeutics, Inc. (RNTX) - 1 filing, 2026
- President and CEO at Rein Therapeutics, Inc. (RNTX) - 2 filings, 2024
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-13 | RNTX | Rein Therapeutics, Inc. | P - Open-market purchase | 25.0K | $1.00 | $25K |
| 2024-12-09 | RNTX | Rein Therapeutics, Inc. | P - Open-market purchase | 161 | $2.25 | $362 |
| 2024-12-09 | RNTX | Rein Therapeutics, Inc. | P - Open-market purchase | 239 | $2.24 | $535 |
Companies - Last 90 Days
- Rein Therapeutics, Inc. (RNTX) - 1 filing, last 2026-05-13
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies James Brian Windsor 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.
- Voss Capital, LP - $551K of RNTX open-market activity in the last 12 months
- Rickenbach Josef H. von - $50K of RNTX open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- JANA Partners Management, LP
- Arun Jeldi
- Jan Philipp Jenisch
- Marc Johnson
- James Jones
- Andrew T. Kaplan
- A. J. Kazimi
- Michael John Kazley
Frequently Asked Questions
Who is James Brian Windsor?
James Brian Windsor is a corporate insider at Rein Therapeutics, Inc. (RNTX). Windsor has reported 3 insider filings with the SEC since 2024. The most recent filing was in May 2026.…
How many SEC Form 4 filings has James Brian Windsor submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has James Brian Windsor been buying or selling stock?
Recorded transactions: 3 open-market purchases ($26K) and 0 open-market sales across all tracked filings.
How accurate is James Brian Windsor's historical track record?
Across 3 tracked purchases, James Brian Windsor averaged no 30-day data yet with a win rate pending. InsiderAlpha rates the track record at –/5 stars.
Where can I see all of James Brian Windsor'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 James Brian Windsor profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.