GCTS GCT Semiconductor (GCTS) Insider Trading, Ownership & Congress Trades
Semiconductors & Electronics · Semiconductors & related devices · CIK 0001851961
SEC filings
Insider buyers, 180 days
0
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
55
13F, latest reported quarter
GCT Semiconductor insider trades (Form 4)
Form 4 buys and sells (codes P and S). Grants, option exercises
and conversions excluded.
No insider purchases or sales are on record for GCT Semiconductor Holding, Inc. in the period covered. Source: SEC Form 4 filings, as of 2026-10-28.
Insider
Filed
Shares
Value
Since filing
Context
- 13 earlier Form 4 trades (code P or S) here by this insider (13 buys), the last on Nov 21, 2025.
- +9.8% median (+9.3% mean) 90-day return after 11 previous buys.
- The trade is 2.2% of the 757,771 shares held after it.
- No other insider bought within 30 days.
- 55 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Shin Hyunsoo bought about $21.4K of GCTS on Nov 25, 2025; 55 funds added in the latest 13F quarter.Context
- 12 earlier Form 4 trades (code P or S) here by this insider (12 buys), the last on Nov 20, 2025.
- +10.8% median (+10.7% mean) 90-day return after 10 previous buys.
- The trade is 0.4% of the 741,046 shares held after it.
- No other insider bought within 30 days.
- 55 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Shin Hyunsoo bought about $4.1K of GCTS on Nov 21, 2025; 55 funds added in the latest 13F quarter.Context
- 11 earlier Form 4 trades (code P or S) here by this insider (11 buys), the last on Sep 12, 2025.
- +11.8% median (+12.9% mean) 90-day return after 9 previous buys.
- The trade is 3.4% of the 737,866 shares held after it.
- No other insider bought within 30 days.
- 55 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Shin Hyunsoo bought about $32.6K of GCTS on Nov 20, 2025; 55 funds added in the latest 13F quarter.Context
- 10 earlier Form 4 trades (code P or S) here by this insider (10 buys), the last on Sep 5, 2025.
- +13.1% median (+14.7% mean) 90-day return after 8 previous buys.
- The trade is 6.3% of the 694,321 shares held after it.
- No other insider bought within 30 days.
- 55 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Shin Hyunsoo bought about $66.5K of GCTS on Sep 12, 2025; 55 funds added in the latest 13F quarter.Context
- 9 earlier Form 4 trades (code P or S) here by this insider (9 buys), the last on Sep 4, 2025.
- +14.4% median (+15.4% mean) 90-day return after 7 previous buys.
- The trade is 1.6% of the 650,254 shares held after it.
- No other insider bought within 30 days.
- 55 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Shin Hyunsoo bought about $13.4K of GCTS on Sep 5, 2025; 55 funds added in the latest 13F quarter.15 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
Seven facts, ranked against the sector ·
Rank is not a forecast
Insiders
no insider buys or sells on file
Congress
no House purchase disclosed in the last 12 months
Funds
55 funds bought in last quarter
below 72% of Semiconductors & Electronics
Revenue
-68.6% year over year
below 98% of Semiconductors & Electronics
Margin
-1513.3% net margin
below 99% of Semiconductors & Electronics
Buybacks
no share repurchases reported
Short interest
14.6% of the float short (float per yahoo 2026-10-27) · 7.3 days to cover · settled 2026-10-15
more than 84% of Semiconductors & Electronics
What changed in the last 30 days
Nothing new filed in the last 30 days
Watch GCTS
A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.
The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
-14.0%12M
Insider buy
Indexed to 100, dividend-adjusted, not a price chart.
When a name files heavily, the largest trades are drawn first.
Who owns GCTS: institutional holders (13F)
13F holdings, latest reported quarter
2,999,130 sh
$8.9M
1,695,300 sh
$5.0M
1,296,433 sh
$3.9M
1,281,164 sh
$3.8M
818,485 sh
$2.4M
Congress trades in GCTS
No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.
Activist and 5% holders (13D/13G)
No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.
GCTS planned insider sales (Form 144)
No planned-sale notices
No insider has filed to sell. Watch this after a run-up.
GCTS mutual fund holders (N-PORT)
Funds ranked by the share of their own portfolio in this stock (N-PORT).
Ultra-Small Company Market Fund
$222.8K position · as of 2026-06-30
0.2%
iShares Micro-Cap ETF
$629.8K position · as of 2026-06-30
0.0%
1290 VT Micro Cap Portfolio
$42.5K position · as of 2026-06-30
0.0%
Goldman Sachs Absolute Return Tracker Fund
$305.4K position · as of 2026-06-30
0.0%
VANGUARD EXTENDED MARKET INDEX FUND
$2.4M position · as of 2026-06-30
0.0%
Fidelity Extended Market Index Fund
$777.8K position · as of 2026-05-31
0.0%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M ·
% is the share of the fund's own portfolio
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
The complete filing record, in one place.
The record shows 55 funds added last quarter. Each figure is a federal filing, dated the day it went public.
GCTS financials
Revenue growth
-68.6%
XBRL, annual
Net margin
-1513.3%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$4.1M
four quarters, 2025-07-01 to 2026-06-30
Revenue, TTM GCTS
| FY Dec 2025 | $2.9M |
| FY Dec 2024 | $9.1M |
| FY Dec 2023 | $16.0M |
| FY Dec 2022 | n/a |
| Jun 2026 | $971.0K |
| Mar 2026 | $1.9M |
| Dec 2025 | $758.0K |
| Sep 2025 | $430.0K |
| Jun 2025 | $1.2M |
| Mar 2025 | $496.0K |
| Dec 2024 | $1.8M |
| Sep 2024 | $2.6M |
At each fiscal year end
Single quarter
Net margin, TTM
-1,302%
net income over revenue, 2025-07-01 to 2026-06-30
Net margin, TTM GCTS
| FY Dec 2025 | -1,513% |
| FY Dec 2024 | -135.6% |
| FY Dec 2023 | -140.2% |
| FY Dec 2022 | n/a |
| Jun 2026 | -2,099% |
| Mar 2026 | -513.8% |
| Dec 2025 | -1,190% |
| Sep 2025 | -3,221% |
| Jun 2025 | -1,145% |
| Mar 2025 | -1,405% |
| Dec 2024 | -278.5% |
| Sep 2024 | -272.8% |
At each fiscal year end
Single quarter
Free cash flow, TTM
-$40.7M
operating cash flow minus capex, 2025-07-01 to 2026-06-30
Free cash flow, TTM GCTS
| FY Dec 2025 | -$33.1M |
| FY Dec 2024 | n/a |
| FY Dec 2023 | -$9.2M |
| FY Dec 2022 | n/a |
| Jun 2026 | -$16.9M |
| Mar 2026 | -$7.5M |
| Dec 2025 | -$8.5M |
| Sep 2025 | -$7.8M |
| Jun 2025 | -$8.7M |
| Mar 2025 | -$8.1M |
| Dec 2024 | -$2.6M |
| Sep 2024 | -$4.7M |
At each fiscal year end
Single quarter
Debt to equity
n/a
equity is zero or negative, the ratio has no meaning
Debt to equity GCTS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Cash flow to debt
-0.69x
TTM operating cash flow over LongTermDebt as filed 2026-06-30 (includes the current portion)
Cash flow to debt GCTS
| FY Dec 2025 | -0.49x |
| FY Dec 2024 | -0.73x |
| FY Dec 2023 | -0.11x |
| FY Dec 2022 | n/a |
| Jun 2026 | -0.69x |
| Mar 2026 | -0.52x |
| Dec 2025 | -0.49x |
| Sep 2025 | -0.40x |
| Jun 2025 | -0.45x |
| Mar 2025 | -0.49x |
| Dec 2024 | -0.73x |
| Sep 2024 | -0.71x |
At each fiscal year end
Trailing four quarters at each quarter end
Return on equity
n/a
average equity is zero or negative
Return on equity GCTS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Return on assets
-157.5%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on assets GCTS
| FY Dec 2025 | -244.1% |
| FY Dec 2024 | -68.2% |
| FY Dec 2023 | -12.0% |
| FY Dec 2022 | +6.8% |
| Jun 2026 | -157.5% |
| Mar 2026 | -232.2% |
| Dec 2025 | -244.1% |
| Sep 2025 | -167.7% |
| Jun 2025 | -159.0% |
| Mar 2025 | -75.4% |
| Dec 2024 | -68.2% |
| Sep 2024 | -53.2% |
At each fiscal year end
Trailing four quarters at each quarter end
Return on invested capital
n/a
pre-tax loss, no effective tax rate to apply
Return on invested capital GCTS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Return on capital employed
n/a
capital employed is zero or negative
Return on capital employed GCTS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | -11.3% |
| FY Dec 2022 | -0.3% |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
P/E, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
P/E, trailing GCTS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Enterprise value
$138.0M
market value at close 2026-10-26 on 2026-08-06 shares, plus LongTermDebt as filed 2026-06-30 (includes the current portion), minus cash 2026-06-30
Enterprise value GCTS
| FY Dec 2025 | $130.6M |
| FY Dec 2024 | $152.4M |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| Jun 2026 | $271.6M |
| Mar 2026 | $133.2M |
| Dec 2025 | $130.6M |
| Sep 2025 | $141.3M |
| Jun 2025 | $122.8M |
| Mar 2025 | $128.3M |
| Dec 2024 | $152.4M |
| Sep 2024 | $198.3M |
At each fiscal year end
Trailing four quarters at each quarter end
FCF yield
-35.9%
TTM free cash flow over market value at close 2026-10-26
FCF yield GCTS
| FY Dec 2025 | -48.3% |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| Jun 2026 | -16.5% |
| Mar 2026 | -39.3% |
| Dec 2025 | -48.3% |
| Sep 2025 | -32.1% |
| Jun 2025 | -33.4% |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
PEG, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
PEG, trailing GCTS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Price as of 2026-10-26. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
| 2025-12 | 2024-12 | 2023-12 | 2022-12 | |
|---|---|---|---|---|
| Revenue | $2.9M | $9.1M | $16.0M | n/a |
| Gross profit | -$1.8M | $5.1M | $6.7M | n/a |
| Operating income | -$36.5M | -$13.1M | -$14.6M | -$1.2M |
| Net income | -$43.4M | -$12.4M | -$22.5M | $24.3M |
| EPS (diluted) | -0.82 | -0.30 | -0.94 | n/a |
| Operating cash flow | -$30.7M | -$31.0M | -$8.8M | -$1.5M |
| Cash | $590.0K | $1.4M | $258.0K | $521.1K |
| Long-term debt | $6.0M | $4.9M | $6.2M | n/a |
| Buybacks | n/a | n/a | $318.4M | n/a |
SEC XBRL, fiscal years, as known on 2026-10-28
GCTS Stock Sonar score 4/7 axes
Find similar shapesCompareGCTS ranks highest on risk and compliance (42nd percentile) and institutional and government (28th), and lowest on growth (2nd), among Semiconductors & Electronics peers.
4 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored
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