Summary
Updated Aug 31, 2026
Sumitaka Yamamoto is Chairman, CEO & President, Director, 10% Owner of HeartCore Enterprises, Inc. (HTCR). 1 SEC Form 4 filing on record, dated 2 December 2024. Most recent open-market trade: sold $10K of HTCR on 2 December 2024. Lifetime open-market sales: $10K.
Recent Transactions
2Every recent SEC Form 4 transaction Sumitaka Yamamoto has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Sumitaka Yamamoto go back to 2024: 1 primary Form 4 filing, an average of 0.3 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.
Most Active Insiders Right Now
Sumitaka Yamamoto has no co-filers on record, so these are insiders with the largest open-market activity across the market in the last 90 days.
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- Andrew Stafman - $123.54M of TWLO 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 Sumitaka Yamamoto?
Sumitaka Yamamoto is a corporate insider, tracked as Chairman, CEO & President, Director, 10% Owner of HeartCore Enterprises, Inc. (HTCR). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Sumitaka Yamamoto last file a Form 4?
The only primary Form 4 on record is dated 2 December 2024.
Has Sumitaka Yamamoto been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($10K) across all tracked filings.
Where can I see all of Sumitaka Yamamoto'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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