Christine J. Mastandrea - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Christine J. Mastandrea has filed 2 SEC Form 4 filings across 1 company in the last 90 days.
Profile
Christine J. Mastandrea holds the role of President and COO at Whitestone REIT (WSR). Mastandrea has reported 4 insider filings with the SEC since 2025. The most recent filing was in July 2026.
| Role | President and COO |
|---|---|
| Notability | 40/100 |
Board memberships
- Whitestone REIT
Reported roles
- President and COO
Trading Pattern
InsiderAlpha's records for Christine J. Mastandrea go back to 2025: 4 primary Form 4 filings, an average of 2.0 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 Christine J. Mastandrea 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.
- President and COO at Whitestone REIT (WSR) - 3 filings, 2026
- Chief Operating Officer at Whitestone REIT (WSR) - 1 filing, 2025
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-07-15 | WSR | Whitestone REIT | D - Derivative transaction | 718.9K | $19.00 | $13.66M |
| 2026-07-15 | WSR | Whitestone REIT | A - Grant or award | 246.4K | $0.00 | |
| 2026-07-02 | WSR | Whitestone REIT | F - Tax withholding / forfeiture | 9.0K | $18.96 | $170K |
| 2026-04-06 | WSR | Whitestone REIT | A - Grant or award | 18.5K | $0.00 | |
| 2025-06-30 | WSR | Whitestone REIT | F - Tax withholding / forfeiture | 6.5K | $12.48 | $81K |
| 2025-06-30 | WSR | Whitestone REIT | A - Grant or award | 23.3K | $0.00 |
Companies - Last 90 Days
- Whitestone REIT (WSR) - 2 filings, last 2026-07-15
Most Active Insiders Right Now
Christine J. Mastandrea has no recent co-filers at the same companies, so here are the insiders with the largest open-market activity across the market in the last 90 days.
- MetLife Investment Management, LLC - $1600000.00B of FINS open-market activity in the last 90 days
- Magnetar Financial LLC - $16357.48B of CRWV open-market activity in the last 90 days
- Marianne Okland - $18.46B of STNG open-market activity in the last 90 days
- VisionWave Holdings, Inc. - $14.13B of SVRE open-market activity in the last 90 days
- Vanessa Allen Sutherland - $7.44B of PSX open-market activity in the last 90 days
- AI Alpine (Luxembourg) S.a.r.l. - $2.69B of INIO open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Jonathan H. Cohen
- Ryan Cohen
- Charles K. Cohn
- Coliseum Capital Management, LLC
- Column Group IV GP, LP
- Connect Midstream, LLC
- CONSTELLATION SOFTWARE INC
- Lisa A. Conte
Frequently Asked Questions
Who is Christine J. Mastandrea?
Christine J. Mastandrea holds the role of President and COO at Whitestone REIT (WSR). Mastandrea has reported 4 insider filings with the SEC since 2025. The most recent filing was in July 2026.…
How many SEC Form 4 filings has Christine J. Mastandrea submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Where can I see all of Christine J. Mastandrea'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 Christine J. Mastandrea profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.