Summary
Updated Aug 31, 2026
Steven D. Cosler files SEC Form 4 reports at Guardian Pharmacy Services, Inc. (GRDN). 10 SEC Form 4 filings on record going back to 2024, most recently on 7 May 2026. Most recent open-market trade: bought $100K of GRDN on 5 December 2025. Lifetime open-market purchases: $348K. Historical track record: 3/5 stars across 3 tracked purchases.
Recent Transactions
11Every recent SEC Form 4 transaction Steven D. Cosler has reported, most recent first.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★★☆☆ (3/5) |
| Total purchases tracked | 3 |
| Purchases with forward-return data | 3 |
| 30-day win rate | 67% |
| 90-day win rate | 67% |
| Avg 5-day return | +3.10% |
| Avg 30-day return | +0.53% |
| Avg 90-day return | +12.18% |
| Best 30-day return | +1.30% |
Trading Pattern
InsiderAlpha's records for Steven D. Cosler go back to 2024: 10 primary Form 4 filings, an average of 3.3 per year. The typical open-market purchase is $116K (3 buys totaling $348K). The largest single buy on record is $149K of GRDN in 2024. 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 Steven D. Cosler 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.
- Bindley Capital Partners I, LLC - $105.99M of GRDN open-market activity in the last 12 months
- William E. Bindley - $105.99M of GRDN open-market activity in the last 12 months
- Thomas J. Salentine Jr. - $105.99M of GRDN open-market activity in the last 12 months
- Pharmacy Investors, LLC - $44.01M of GRDN open-market activity in the last 12 months
- John Ackerman - $32.75M of GRDN open-market activity in the last 12 months
- Fred Burke - $19.93M of GRDN 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 Steven D. Cosler?
Steven D. Cosler is a corporate insider of Guardian Pharmacy Services, Inc. (GRDN). InsiderAlpha holds 10 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Steven D. Cosler last file a Form 4?
The most recent primary Form 4 on record is dated 7 May 2026, one of 10 filings going back to 2024.
Has Steven D. Cosler been buying or selling stock?
Recorded transactions: 3 open-market purchases ($348K) and 0 open-market sales across all tracked filings.
How accurate is Steven D. Cosler's historical track record?
Across 3 tracked purchases, Steven D. Cosler averaged +0.5% avg 30-day return with a 67% 30-day win rate. InsiderAlpha rates the track record at 3/5 stars.
Where can I see all of Steven D. Cosler'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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