Summary
Updated Aug 30, 2026
Grigorios Siokas is Chief Executive Officer, Director, 10% Owner of Cosmos Health Inc. (COSM). 21 SEC Form 4 filings on record going back to 2024, most recently on 31 July 2026. Most recent open-market trade: bought $70K of COSM on 16 December 2025. Lifetime open-market purchases: $264K. Historical track record: 1/5 stars across 6 tracked purchases.
Recent Transactions
6Every recent SEC Form 4 transaction Grigorios Siokas has reported, most recent first.
Most Active Insiders Right Now
Grigorios Siokas has no co-filers on record, so these are insiders with the largest open-market activity across the market in the last 90 days.
- Joseph Gebbia - $510.90M of ABNB open-market activity in the last 90 days
- Tony W. Lee - $497.40M of PRMB open-market activity in the last 90 days
- ORCP III DE TopCo GP, LLC - $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
- Keith A. Meister - $486.00M of ILMN open-market activity in the last 90 days
- Niccolo Camerana - $478.31M of STNG 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 Grigorios Siokas?
Grigorios Siokas is a corporate insider, tracked as Chief Executive Officer, Director, 10% Owner of Cosmos Health Inc. (COSM). InsiderAlpha holds 21 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Grigorios Siokas submitted recently?
4 primary Form 4 filings in the last 90 days, covering 1 company.
Has Grigorios Siokas been buying or selling stock?
Recorded transactions: 6 open-market purchases ($264K) and 0 open-market sales across all tracked filings.
How accurate is Grigorios Siokas's historical track record?
Across 6 tracked purchases, Grigorios Siokas averaged -16.0% avg 30-day return with a 17% 30-day win rate. InsiderAlpha rates the track record at 1/5 stars.
Where can I see all of Grigorios Siokas'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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