Insider Screener
Real-time Form 4 Filtering Engine
| Filing Date | Trade Date | Ticker | Company Name | Reporting Person | Relationship | Industry (by SEC) | Type | Price | Qty | Total, $ | Owned After | Change, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025-03-20 04:30 | 2025-03-17 | ACMR | Acm Research Inc. | Hu Chenming | Director | Special Industry Machinery, NEC | SALE | $30.00 | 163,308 | $4,899,240 | 100,002 | -62.0% |
| 2021-09-24 23:34 | 2021-09-22 | AMBA | Ambarella, Inc. | Hu Chenming | Director | Semiconductors & Related Devices | SALE | $160.00 | 3,666 | $586,560 | 10,246 | -26.4% |
| 2021-09-11 00:37 | 2021-09-09 | AMBA | Ambarella, Inc. | Hu Chenming | Director | Semiconductors & Related Devices | SALE | $140.00 | 4,000 | $560,000 | 12,953 | -23.6% |
| 2021-09-02 23:57 | 2021-09-01 | AMBA | Ambarella, Inc. | Hu Chenming | Director | Semiconductors & Related Devices | SALE | $120.00 | 4,000 | $480,000 | 16,953 | -19.1% |
| 2021-02-17 01:43 | 2021-02-12 | ACMR | Acm Research Inc. | Hu Chenming | Director | Special Industry Machinery, NEC | SALE | $120.00 | 10,000 | $1,200,000 | 21,102 | -32.2% |
| 2020-12-05 01:07 | 2020-12-03 | AMBA | Ambarella, Inc. | Hu Chenming | Director | Semiconductors & Related Devices | SALE | $88.00 | 5,818 | $511,984 | 18,079 | -24.3% |
| 2020-12-03 01:18 | 2020-11-27 | AMBA | Ambarella, Inc. | Hu Chenming | Director | Semiconductors & Related Devices | SALE | $78.00 | 5,000 | $390,000 | 23,897 | -17.3% |
| 2020-11-26 01:24 | 2020-11-24 | AMBA | Ambarella, Inc. | Hu Chenming | Director | Semiconductors & Related Devices | SALE | $70.67 | 5,000 | $353,350 | 28,897 | -14.8% |
| 2020-08-06 00:30 | 2020-08-03 | ACMR | Acm Research Inc. | Hu Chenming | Director | Special Industry Machinery, NEC | SALE | $100.00 | 7,806 | $780,600 | 0 | -100.0% |
| 2020-07-16 03:00 | 2020-07-13 | ACMR | Acm Research Inc. | Hu Chenming | Director | Special Industry Machinery, NEC | SALE | $84.15 | 14,000 | $1,178,100 | 7,806 | -64.2% |
| 2020-06-06 04:16 | 2020-06-03 | ACMR | Acm Research Inc. | Hu Chenming | Director | Special Industry Machinery, NEC | SALE | $65.12 | 8,194 | $533,593 | 21,806 | -27.3% |
| 2019-11-26 18:59 | 2019-11-25 | IPHI | N/A | Hu Chenming | Director | Other | SALE | $71.00 | 7,000 | $497,000 | 65,503 | -9.7% |
| 2019-10-02 00:43 | 2019-09-30 | AMBA | Ambarella, Inc. | Hu Chenming | Director | Semiconductors & Related Devices | SALE | $63.00 | 10,000 | $630,000 | 29,354 | -25.4% |
| 2015-06-11 01:01 | 2015-06-09 | AMBA | Ambarella, Inc. | Hu Chenming | Director | Semiconductors & Related Devices | OPT+S | $110.44 | 15,000 | $1,656,656 | 4,167 | -78.3% |
| 2013-11-20 00:13 | 2013-11-18 | SNDK | N/A | Hu Chenming | Director | Other | OPT+S | $69.44 | 22,889 | $1,589,394 | 3,106 | -88.1% |
| 2013-08-16 02:35 | 2013-08-13 | SNDK | N/A | Hu Chenming | Director | Other | OPT+S | $58.00 | 12,000 | $696,000 | 3,106 | -79.4% |
| 2013-02-06 05:24 | 2013-02-05 | SNDK | N/A | Hu Chenming | Director | Other | SALE | $49.72 | 12,000 | $596,692 | 11,639 | -50.8% |
| 2011-08-16 00:28 | 2011-08-10 | IPHI | N/A | Hu Chenming | Director | Other | BUY | $8.50 | 11,700 | $99,450 | 55,724 | +26.6% |
| 2011-08-11 23:17 | 2011-08-09 | IPHI | N/A | Hu Chenming | Director | Other | BUY | $8.65 | 22,900 | $198,080 | 44,024 | +108.4% |
Strategic Signal Filtering
Our screener allows you to cut through the noise of routine stock grants and small trades. By focusing on high-value transactions from C-suite executives (CEO/CFO), you can identify where the "Smart Money" is being deployed with maximum conviction.
Investing Without Illusions
Insider data is not a magic wand, but it is the most honest indicator available. While insiders sell for many reasons (taxes, personal needs), they generally buy for only one: they believe the stock price is undervalued. We provide the tools to track these skin-in-the-game moves.
UNDERSTANDING THE DATA
FILING DATE: The date and time when the transaction was reported to the SEC. This is when the public first receives the information.
TRADE DATE: The actual day the insider executed the purchase or sale in the market.
INDUSTRY: The specific market sector the company operates in. Useful for identifying broader institutional capital flows across sectors.
OWNED AFTER: The total number of shares held by the insider following the transaction. This highlights the insider's remaining conviction in the company.
CHANGE %: The percentage increase or decrease of the insider's total position. Large percentage changes often carry more weight than the dollar amount alone.
TRADE TYPES DEFINITIONS
BUY: An open market purchase. Typically indicates an insider's belief that the stock is undervalued or poised for growth.
SELL: An open market sale. While often used for diversification or liquidity, large or unexpected sales can be a warning signal.
OPT+S (OPTION EXERCISE & SALE): This occurs when an insider exercises their stock options and sells them immediately. Often part of a structured compensation plan.