Dun Haiping sold ACM Research Inc ($ACMR) shares on the open market four times over the past year, totaling about $493,000. The most recent sale occurred on March 9, 2026. These sales rank 6,484th among 11,678 individual insiders in our database, where the average is $8.6 million across about 6.4 transactions. Dun Haiping made no open market purchases in the last 365 days.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 9, 2026 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Stock Option | 5000 | $0.00 | 55,000.0000 | 68,414,313 | 8.33% | 0.01% |
| March 9, 2026 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Class A Common Stock | 5000 | $5.60 | 860,090.0000 | 68,414,313 | 0.58% | 0.01% |
| March 9, 2026 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 4100 | $43.37 | 855,990.0000 | 68,414,313 | 0.48% | 0.01% |
| March 9, 2026 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 900 | $43.94 | 855,090.0000 | 68,414,313 | 0.11% | 0.00% |
| Nov. 12, 2025 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | G | Class A Common Stock | 755090 | $0.00 | 755,090.0000 | 68,414,313 | 50.00% | 1.10% |
| Aug. 12, 2025 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | A | Stock Option | 20000 | $0.00 | 20,000.0000 | 66,237,424 | 9999.99% | 0.03% |
| March 14, 2025 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 7062 | $29.23 | 855,090.0000 | 66,237,424 | 0.82% | 0.01% |
| March 14, 2025 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 2456 | $28.32 | 862,152.0000 | 66,237,424 | 0.28% | 0.00% |
| March 10, 2025 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 15001 | $26.54 | 864,608.0000 | 66,237,424 | 1.71% | 0.02% |
| March 3, 2025 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Class A Common Stock | 25001 | $0.50 | 880,091.0000 | 66,237,424 | 2.92% | 0.04% |
| March 3, 2025 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | F | Class A Common Stock | 482 | $25.94 | 879,609.0000 | 66,237,424 | 0.05% | 0.00% |
| March 3, 2025 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Stock Option | 25001 | $0.00 | 0.0000 | 66,237,424 | 100.00% | 0.04% |
| Nov. 29, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 19058 | $17.43 | 855,090.0000 | 66,671,526 | 2.18% | 0.03% |
| Nov. 22, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 15000 | $19.12 | 874,148.0000 | 66,671,526 | 1.69% | 0.02% |
| Nov. 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Stock Option | 35000 | $0.00 | 25,001.0000 | 66,671,526 | 58.33% | 0.05% |
| Nov. 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Class A Common Stock | 35000 | $0.50 | 890,090.0000 | 66,671,526 | 4.09% | 0.05% |
| Nov. 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | F | Class A Common Stock | 942 | $18.59 | 889,148.0000 | 66,671,526 | 0.11% | 0.00% |
| Aug. 29, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 19097 | $18.08 | 855,090.0000 | 64,870,543 | 2.18% | 0.03% |
| Aug. 22, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 15000 | $19.85 | 874,187.0000 | 64,870,543 | 1.69% | 0.02% |
| Aug. 12, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | A | Stock Option | 20000 | $0.00 | 20,000.0000 | 64,870,543 | 9999.99% | 0.03% |
| Aug. 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | F | Class A Common Stock | 903 | $19.38 | 889,187.0000 | 64,870,543 | 0.10% | 0.00% |
| Aug. 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Stock Option | 35000 | $0.00 | 60,001.0000 | 64,870,543 | 36.84% | 0.05% |
| Aug. 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Class A Common Stock | 35000 | $0.50 | 890,090.0000 | 64,870,543 | 4.09% | 0.05% |
| June 27, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | G | Class A Common Stock | 100000 | $0.00 | 855,090.0000 | 64,870,543 | 10.47% | 0.15% |
| June 27, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | G | Class B Common Stock | 300000 | $0.00 | 300,000.0000 | 64,870,543 | 50.00% | 0.46% |
| May 29, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 19239 | $22.63 | 855,090.0000 | 64,870,543 | 2.20% | 0.03% |
| May 22, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 15000 | $22.88 | 874,329.0000 | 64,870,543 | 1.69% | 0.02% |
| May 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Class A Common Stock | 35000 | $0.50 | 890,090.0000 | 64,870,543 | 4.09% | 0.05% |
| May 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | F | Class A Common Stock | 761 | $23.02 | 889,329.0000 | 64,870,543 | 0.09% | 0.00% |
| May 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Stock Option | 35000 | $0.00 | 95,001.0000 | 64,870,543 | 26.92% | 0.05% |
| March 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 15877 | $27.56 | 858,647.0000 | 64,870,543 | 1.82% | 0.02% |
| March 14, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 3557 | $28.34 | 855,090.0000 | 64,870,543 | 0.41% | 0.01% |
| March 8, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 15000 | $30.36 | 874,524.0000 | 64,870,543 | 1.69% | 0.02% |
| March 1, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Class A Common Stock | 35000 | $0.50 | 890,090.0000 | 64,870,543 | 4.09% | 0.05% |
| March 1, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Stock Option | 35000 | $0.00 | 130,001.0000 | 64,870,543 | 21.21% | 0.05% |
| March 1, 2024 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | F | Class A Common Stock | 566 | $30.92 | 889,524.0000 | 64,870,543 | 0.06% | 0.00% |
| Nov. 29, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 18984 | $17.25 | 855,090.0000 | 65,341,771 | 2.17% | 0.03% |
| Nov. 22, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 15000 | $17.66 | 874,074.0000 | 65,341,771 | 1.69% | 0.02% |
| Nov. 14, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Stock Option | 35000 | $0.00 | 165,001.0000 | 65,341,771 | 17.50% | 0.05% |
| Nov. 14, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | F | Class A Common Stock | 1016 | $17.23 | 889,074.0000 | 65,341,771 | 0.11% | 0.00% |
| Nov. 14, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Class A Common Stock | 35000 | $0.50 | 890,090.0000 | 65,341,771 | 4.09% | 0.05% |
| Aug. 22, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 32098 | $13.85 | 855,090.0000 | 65,341,771 | 3.62% | 0.05% |
| Aug. 10, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | A | Stock Option | 30000 | $0.00 | 30,000.0000 | 65,341,771 | 50.00% | 0.05% |
| Aug. 10, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | A | Stock Option | 24000 | $0.00 | 24,000.0000 | 65,341,771 | 50.00% | 0.04% |
| Aug. 10, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | A | Stock Option | 24000 | $0.00 | 24,000.0000 | 65,341,771 | 50.00% | 0.04% |
| Aug. 10, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | A | Stock Option | 30000 | $0.00 | 30,000.0000 | 65,341,771 | 50.00% | 0.05% |
| June 1, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 37500 | $10.00 | 887,188.0000 | 65,341,771 | 4.06% | 0.06% |
| May 22, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Class A Common Stock | 37500 | $0.50 | 926,616.0000 | 65,341,771 | 4.22% | 0.06% |
| May 22, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Stock Option | 37500 | $0.00 | 200,001.0000 | 65,341,771 | 15.79% | 0.06% |
| May 22, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | F | Class A Common Stock | 1928 | $9.73 | 924,688.0000 | 65,341,771 | 0.21% | 0.00% |
| March 16, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | S | Class A Common Stock | 37500 | $12.06 | 889,116.0000 | 65,341,771 | 4.05% | 0.06% |
| March 9, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Class A Common Stock | 37500 | $0.50 | 928,120.0000 | 65,341,771 | 4.21% | 0.06% |
| March 9, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | M | Stock Option | 37500 | $0.00 | 237,501.0000 | 65,341,771 | 13.64% | 0.06% |
| March 9, 2023 | ACM Research, Inc. | $ACMR | Dun Haiping | Not found | F | Class A Common Stock | 1504 | $12.47 | 926,616.0000 | 65,341,771 | 0.16% | 0.00% |