Summary
Updated Aug 31, 2026
John W. Smither is Chief Financial Officer of MBX Biosciences, Inc. (MBX). 5 SEC Form 4 filings on record going back to 2025, most recently on 4 August 2026. Most recent open-market trade: sold $35K of GNLX on 2 July 2026. Lifetime open-market sales: $35K.
Recent Transactions
5Every recent SEC Form 4 transaction John W. Smither has reported, most recent first.
Trading Pattern
InsiderAlpha's records for John W. Smither go back to 2025: 5 primary Form 4 filings, an average of 2.5 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 John W. Smither 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.
- Patrick J. Heron - $12.00M of MBX open-market activity in the last 12 months
- Salomon Azoulay - $2.72M of MBX open-market activity in the last 12 months
- P. Kent Hawryluk - $816K of MBX open-market activity in the last 12 months
- Steven L. Hoerter - $265K of MBX open-market activity in the last 12 months
- John Thomas - $109K of GNLX open-market activity in the last 12 months
- Thomas Zindrick - $92K of GNLX 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 John W. Smither?
John W. Smither is a corporate insider, tracked as Chief Financial Officer of MBX Biosciences, Inc. (MBX). InsiderAlpha holds 5 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has John W. Smither submitted recently?
3 primary Form 4 filings in the last 90 days, covering 2 companies.
Has John W. Smither been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($35K) across all tracked filings.
Where can I see all of John W. Smither'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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