Summary
Updated Aug 31, 2026
Mark J. Silk is Director, 10% Owner of SIFCO INDUSTRIES INC (SIF). 1 SEC Form 4 filing on record, dated 30 January 2026.
Recent Transactions
1Every recent SEC Form 4 transaction Mark J. Silk has reported, most recent first.
Most Active Insiders Right Now
Mark J. Silk has no co-filers on record, so these are insiders with the largest open-market activity across the market in the last 90 days.
- SGF FANG Holdings, LP - $2.04B of FANG open-market activity in the last 90 days
- James Michael Chu - $1.10B of BIRK open-market activity in the last 90 days
- SUMITOMO MITSUI FINANCIAL GROUP, INC. - $995.27M of JEF open-market activity in the last 90 days
- Uber Technologies, Inc - $950.85M of AUR open-market activity in the last 90 days
- KKR Group Partnership L.P. - $857.49M of BTSG open-market activity in the last 90 days
- KKR Phoenix Aggregator L.P. - $857.49M of BTSG 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 Mark J. Silk?
Mark J. Silk is a corporate insider, tracked as Director, 10% Owner of SIFCO INDUSTRIES INC (SIF). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2026, updated as new SEC EDGAR filings are processed.
When did Mark J. Silk last file a Form 4?
The only primary Form 4 on record is dated 30 January 2026.
Where can I see all of Mark J. Silk'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
Follow Mark J. Silk and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial
