Summary
Updated Aug 31, 2026
R. Janet Whitmore files SEC Form 4 reports at NANOPHASE TECHNOLOGIES Corp (SLSN). 3 SEC Form 4 filings on record going back to 2024, most recently on 30 December 2025. Most recent open-market trade: bought $2K of SLSN on 30 December 2025. Lifetime open-market purchases: $106K. Historical track record: 3/5 stars across 17 tracked purchases.
Recent Transactions
17Every recent SEC Form 4 transaction R. Janet Whitmore 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 | 17 |
| Purchases with forward-return data | 7 |
| 30-day win rate | 71% |
| 90-day win rate | 0% |
| Avg 5-day return | +5.11% |
| Avg 30-day return | -1.18% |
| Avg 90-day return | -35.74% |
| Best 30-day return | +10.38% |
Trading Pattern
InsiderAlpha's records for R. Janet Whitmore go back to 2024: 3 primary Form 4 filings, an average of 1.0 per year. The typical open-market purchase is $6K (17 buys totaling $106K). The largest single buy on record is $34K of SLSN in 2025. 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.
Most Active Insiders Right Now
R. Janet Whitmore has no co-filers on record, so these are insiders with the largest open-market activity across the market in the last 90 days.
- Tony W. Lee - $497.40M of PRMB open-market activity in the last 90 days
- Argon Holdco LLC - $491.11M of CRBG open-market activity in the last 90 days
- Niccolo Camerana - $478.31M of STNG open-market activity in the last 90 days
- Kenneth Bryan Dart - $468.21M of FLUT open-market activity in the last 90 days
- RA CAPITAL MANAGEMENT, L.P. - $430.69M of PBLS open-market activity in the last 90 days
- DST Global Advisors Ltd - $416.93M of CHYM open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is R. Janet Whitmore?
R. Janet Whitmore is a corporate insider of NANOPHASE TECHNOLOGIES Corp (SLSN). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did R. Janet Whitmore last file a Form 4?
The most recent primary Form 4 on record is dated 30 December 2025, one of 3 filings going back to 2024.
Has R. Janet Whitmore been buying or selling stock?
Recorded transactions: 17 open-market purchases ($106K) and 0 open-market sales across all tracked filings.
How accurate is R. Janet Whitmore's historical track record?
Across 17 tracked purchases, R. Janet Whitmore averaged -1.2% avg 30-day return with a 71% 30-day win rate. InsiderAlpha rates the track record at 3/5 stars.
Where can I see all of R. Janet Whitmore'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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