GIGM
Huang Cheng-ming, GIGM's CEO, spent $112.3K of their own money on 37,608 shares at $3, opening a brand-new position.
+$112.3K
37,608 sh @ $3
Huang Cheng-Ming
Director, CEO · SEC CIK 1714166
Insider at
GIGM GIGAMEDIA Ltd
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Buy track record
How this insider's open-market purchases have performed0%
of buys now in profit
0 up · 31 down
Avg return since buy−50.0%
Median return−52.7%
Best trade−38.5%
Worst trade−56.7%
Buys scored31
Average return by holding period — separates good entry timing from riding one long winner
After 1 month
+4.7%
55% won · 31 trades
After 3 months
−0.8%
48% won · 31 trades
After 6 months
+1.5%
48% won · 31 trades
After 12 months
−4.1%
35% won · 31 trades
| Date | Company | 90d trend | Buy price | Value | ΔOwn | 1M | 3M | 6M | 12M | To date |
|---|---|---|---|---|---|---|---|---|---|---|
| Sep 23, 2020 | GIGM | $3 | $16.8K | +0.5% | −2.7% | −1.3% | +25.8% | −16.4% | −53.4% | |
| Sep 22, 2020 | GIGM | $3 | $45.5K | +1.5% | −0.7% | +1.7% | +28.6% | −12.8% | −52.1% | |
| Sep 9, 2020 | GIGM | $3 | $21.8K | +0.7% | −4.3% | +6.0% | +6.7% | −12.0% | −53.7% | |
| Sep 8, 2020 | GIGM | $3 | $144.9K | +5.0% | −1.0% | +7.0% | +9.1% | −7.3% | −51.6% | |
| Sep 4, 2020 | GIGM | $3 | $30.4K | +1.1% | −2.1% | +0.4% | +9.8% | −3.9% | −51.2% | |
| May 19, 2020 | GIGM | $2 | $99.8K | +4.2% | +18.1% | +7.6% | +11.6% | +6.0% | −44.2% | |
| May 18, 2020 | GIGM | $2 | $146.9K | +6.8% | +22.0% | +11.0% | +13.8% | +9.8% | −43.5% | |
| May 15, 2020 | GIGM | $2 | $23.5K | +1.2% | +17.4% | +16.1% | +17.4% | +12.3% | −41.1% | |
| Aug 19, 2019 | GIGM | $2 | $23.4K | +1.1% | +3.7% | +0.8% | −0.8% | +9.4% | −43.3% | |
| Aug 15, 2019 | GIGM | $2 | $140.7K | +7.5% | +11.9% | +10.6% | +8.8% | +21.2% | −38.5% | |
| Jun 21, 2019 | GIGM | $3 | $25.1K | +1.3% | −1.6% | +0.8% | −5.1% | +20.8% | −45.5% | |
| Jun 19, 2019 | GIGM | $2 | $144.6K | +7.9% | +0.8% | +1.6% | −0.8% | +17.6% | −44.4% | |
| Jun 14, 2019 | GIGM | $3 | $15.7K | +0.8% | −2.0% | −1.2% | −2.0% | +8.2% | −45.7% | |
| Jun 13, 2019 | GIGM | $3 | $9.5K | +0.5% | +0.4% | +2.4% | +1.2% | +10.8% | −44.4% | |
| Jun 12, 2019 | GIGM | $2 | $61K | +3.6% | +4.6% | +6.2% | +2.9% | +12.0% | −42.3% | |
| Dec 21, 2018 | GIGM | $3 | $204K | +11% | +4.3% | −0.4% | −9.3% | −13.9% | −50.5% | |
| Dec 19, 2018 | GIGM | $3 | $215.4K | +15% | +5.0% | +0.0% | −10.4% | −11.1% | −50.2% | |
| Sep 14, 2018 | GIGM | $3 | $191.6K | +13% | −9.6% | −14.2% | −8.6% | −16.2% | −54.0% | |
| Sep 13, 2018 | GIGM | $3 | $17.8K | +1.3% | −8.4% | −13.1% | −8.1% | −14.1% | −53.4% | |
| Aug 16, 2018 | GIGM | $3 | $151.8K | +12% | −1.3% | −8.7% | −4.7% | −22.1% | −53.5% | |
| Aug 15, 2018 | GIGM | $3 | $4.1K | +0.3% | +0.0% | −7.5% | −1.7% | −23.4% | −52.9% | |
| Aug 14, 2018 | GIGM | $3 | $173.2K | +16% | +2.7% | −8.8% | −2.0% | −21.8% | −52.7% | |
| Jun 5, 2018 | GIGM | $3 | $60.3K | +5.4% | −6.5% | −6.9% | −14.3% | −27.7% | −56.7% | |
| Jun 4, 2018 | GIGM | $3 | $38.7K | +3.8% | −4.5% | −6.7% | −12.1% | −25.2% | −55.7% | |
| Dec 20, 2017 | GIGM | $3 | $27.5K | +2.8% | +21.0% | −12.1% | +2.0% | −8.9% | −54.4% | |
| Dec 19, 2017 | GIGM | $3 | $105.1K | +12% | +19.1% | −12.9% | +1.0% | −7.9% | −54.1% | |
| Dec 6, 2017 | GIGM | $3 | $161.8K | +23% | +16.6% | −4.7% | +9.8% | −6.8% | −52.9% | |
| Sep 19, 2017 | GIGM | $3 | $150K | +27% | +17.0% | +1.0% | −12.0% | +0.0% | −53.7% | |
| Sep 18, 2017 | GIGM | $3 | $149.1K | +36% | +17.1% | +0.0% | −11.4% | −2.3% | −53.4% | |
| Aug 21, 2017 | GIGM | $3 | $294.3K | +266% | +8.8% | +3.1% | −2.4% | +4.4% | −52.9% | |
| Aug 4, 2017 | GIGM | $3 | $112.3K | NEW | −1.0% | −2.0% | +3.3% | −5.6% | −54.4% |
How this is calculated. We score only open-market purchases (SEC code
P) — the buys that carry real signal. Each trade's return is measured from the adjusted closing price on the purchase date to the latest close, accounting for stock splits and dividends. The 1M/3M/6M/12M columns show the same trade's return after each fixed holding period; a dash means that horizon hasn't elapsed yet or isn't priceable. Sales are excluded because insiders sell for many routine reasons. With only 31 scored trades, treat this as a small sample, not a verdict.
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Open-market buys
$3.01M
31 trades
Open-market sells
$0
0 trades
Net flow
+$3.01M
Net buying
Total filings
31
transactions shown
Full transaction history
All Form 4 activity across every company, newest firstFrequently asked questions
How is Huang Cheng-Ming's win rate calculated?
We take every open-market purchase (SEC code P) we can match to a stock price, then compare the split- and dividend-adjusted price on the purchase date to the most recent close. The win rate is the share of those buys currently trading above the purchase price. Sales and share grants are not scored.
Why are some buys not included in the score?
A purchase is excluded if we can't price it — for example if the ticker is missing from the filing, the company has been delisted, or the security isn't a common stock we can match to market data. Excluded counts are shown next to the scored total.
What do the 1M / 3M / 6M / 12M columns mean?
They show each purchase's return after a fixed holding period — one, three, six, and twelve months from the buy date — using split- and dividend-adjusted prices. This separates good entry timing from simply holding a long-running winner. A dash means that horizon hasn't elapsed yet for that trade, or the stock couldn't be priced at that date.
Does a high win rate mean I should copy this insider?
No. Past performance does not predict future results, sample sizes are often small, and an insider's edge in their own company doesn't transfer to yours. This is context, not a recommendation. InsiderSource is not investment advice.
Where does this data come from?
Trades come from Huang Cheng-Ming's SEC Form 4 filings on EDGAR. Prices come from public market data and are split/dividend-adjusted. Always verify against the original filings before acting.