38 transactions on file (4 open-market purchases and 0 open-market sales).
| Date | Insider | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|
| 2026-09-10 | Sum Alex Sr. VP of Sales and Marketing Grant / award | Grant / award | +75,000 | $0.00 | +0 | 258,743 |
| 2026-09-10 | Schlaefer John President, CEO & Class III Dir · Director Grant / award | Grant / award | +150,000 | $0.00 | +0 | 352,728 |
| 2026-09-10 | Kim Jeong-Min Chief Technology Officer Grant / award | Grant / award | +100,000 | $0.00 | +0 | 402,701 |
| 2026-09-10 | Cheng Edmond Chief Financial Officer Grant / award | Grant / award | +145,000 | $0.00 | +0 | 296,000 |
| 2026-06-30 | TUDER JEFFREY Director Grant / award | Grant / award | +9,259 | $0.00 | +0 | 151,190 |
33 more transactions are on Measure
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| Insider | Role | On Sep 23, 2025 | Now | Change | Sold | Shape |
|---|---|---|---|---|---|---|
| Shin HyunsooDirector | Director | 712,413 | 757,771 | +6.37% | - |
What each insider held after every open-market trade, over the last twelve months.
The assistant answers from what GCTS has actually filed: 4 annual reports filed with the SEC, 33 Form 4 filings from the last year and 1 fund that holds it. Every figure in a reply links to the filing it came from, so an answer can be checked rather than believed.
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Source
From SEC Form 4 filings, filed within two business days of a transaction.
Past transactions say nothing about future ones, and none of this is investment advice.
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Watch GCTS and every open-market Form 4 worth a row (a purchase, a senior officer's sale, anything at a million dollars) lands in the bell and a daily email, with the 10b5-1 word on it when the filing says so. Free.
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Every Form 4 GCTS insiders file, not just the latest handful, with vesting and tax withholding struck out so what's left reads as a decision.
Every filingMeasure
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Each stake priced at the quarter it was filed, and diffed against the quarter before: how big a bet it is for them, and by how much it moved.
Every position, sizedMeasure
Ask what a run of filings adds up to
Whether this is one decision or a pattern, and how it compares with GCTS's own history of insider activity.
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The table above says who traded. This says what GCTS did over the following 30, 90 and 180 days after each open-market purchase and sale, from this company’s own record rather than a study about companies in general, and with the number of transactions shown beside every average.
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