Summary
Updated Aug 30, 2026
Tiffany Marie Barbre files SEC Form 4 reports at COSTCO WHOLESALE CORP /NEW (COST). 1 SEC Form 4 filing on record, dated 24 October 2025. Most recent open-market trade: sold $1.16M of COST on 24 October 2025. Lifetime open-market sales: $1.16M.
Recent Transactions
7Every recent SEC Form 4 transaction Tiffany Marie Barbre has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Tiffany Marie Barbre go back to 2025: 1 primary Form 4 filing, an average of 0.5 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.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Tiffany Marie Barbre files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Russell D. Miller - $4.47M of COST open-market activity in the last 12 months
- Claudine Adamo - $3.26M of COST open-market activity in the last 12 months
- Javier Polit - $2.26M of COST open-market activity in the last 12 months
- William Richard Wilcox - $2.23M of COST open-market activity in the last 12 months
- Caton Frates - $2.10M of COST open-market activity in the last 12 months
- James C. Klauer - $1.41M of COST open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Tiffany Marie Barbre?
Tiffany Marie Barbre is a corporate insider of COSTCO WHOLESALE CORP /NEW (COST). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Tiffany Marie Barbre last file a Form 4?
The only primary Form 4 on record is dated 24 October 2025.
Has Tiffany Marie Barbre been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($1.16M) across all tracked filings.
Where can I see all of Tiffany Marie Barbre'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.
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