Haiping Dun
CIK 1721581 · View on SEC EDGAR ↗
Insider
First SEC filing: Nov. 2, 2017 · Latest: Nov. 2, 2017
On this page
Insider at
Insider transactions
0 buys (P)
9 sells (S)
Net:
$-954,144
+ 63 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
63 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 18, 2026 | ACMR | S 10b5-1 | 1,200 | $80.29 | $96,348 | 3,800 Direct | -24.00% | Disposed | -2.3% (price as of 2026-08-21) |
| Aug. 18, 2026 | ACMR | S 10b5-1 | 3,400 | $81.31 | $276,454 | 400 Direct | -89.47% | Disposed | -3.5% (price as of 2026-08-21) |
| Aug. 18, 2026 | ACMR | S 10b5-1 | 400 | $82.17 | $32,868 | 0 Direct | -100.00% | Disposed | -4.6% (price as of 2026-08-21) |
| May 19, 2026 | ACMR | S 10b5-1 | 1,858 | $67.54 | $125,489 | 0 Direct | -100.00% | Disposed | 16.1% (price as of 2026-08-21) |
| May 19, 2026 | ACMR | S 10b5-1 | 1,309 | $67.21 | $87,978 | 1,858 Direct | -41.33% | Disposed | 16.7% (price as of 2026-08-21) |
| May 19, 2026 | ACMR | S 10b5-1 | 500 | $65.09 | $32,545 | 3,167 Direct | -13.64% | Disposed | 20.5% (price as of 2026-08-21) |
| May 19, 2026 | ACMR | S 10b5-1 | 1,333 | $63.84 | $85,099 | 3,667 Direct | -26.66% | Disposed | 22.9% (price as of 2026-08-21) |
| March 9, 2026 | ACMR | S 10b5-1 | 900 | $43.94 | $39,546 | 0 Direct | -100.00% | Disposed | 78.5% (price as of 2026-08-21) |
| March 9, 2026 | ACMR | S 10b5-1 | 4,100 | $43.37 | $177,817 | 900 Direct | -82.00% | Disposed | 80.8% (price as of 2026-08-21) |
| March 14, 2025 | ACMR | S 10b5-1 | 7,062 | $29.23 | $206,422 | 755,090 Direct | -0.93% | Disposed | 168.3% (price as of 2026-08-21) |
| March 14, 2025 | ACMR | S 10b5-1 | 2,456 | $28.32 | $69,554 | 762,152 Direct | -0.32% | Disposed | 176.9% (price as of 2026-08-21) |
| March 10, 2025 | ACMR | S 10b5-1 | 15,001 | $26.54 | $398,127 | 764,608 Direct | -1.92% | Disposed | 195.5% (price as of 2026-08-21) |
| Nov. 29, 2024 | ACMR | S 10b5-1 | 19,058 | $17.43 | $332,181 | 755,090 Direct | -2.46% | Disposed | 350.0% (price as of 2026-08-21) |
| Nov. 22, 2024 | ACMR | S 10b5-1 | 15,000 | $19.12 | $286,800 | 774,148 Direct | -1.90% | Disposed | 310.2% (price as of 2026-08-21) |
| Aug. 29, 2024 | ACMR | S 10b5-1 | 19,097 | $18.08 | $345,274 | 755,090 Direct | -2.47% | Disposed | 333.8% (price as of 2026-08-21) |
| Aug. 22, 2024 | ACMR | S 10b5-1 | 15,000 | $19.85 | $297,750 | 774,187 Direct | -1.90% | Disposed | 295.1% (price as of 2026-08-21) |
| May 29, 2024 | ACMR | S 10b5-1 | 19,239 | $22.63 | $435,379 | 855,090 Direct | -2.20% | Disposed | 246.6% (price as of 2026-08-21) |
| May 22, 2024 | ACMR | S 10b5-1 | 15,000 | $22.88 | $343,200 | 874,329 Direct | -1.69% | Disposed | 242.8% (price as of 2026-08-21) |
| March 14, 2024 | ACMR | S 10b5-1 | 3,557 | $28.34 | $100,805 | 855,090 Direct | -0.41% | Disposed | 176.7% (price as of 2026-08-21) |
| March 14, 2024 | ACMR | S 10b5-1 | 15,877 | $27.56 | $437,570 | 858,647 Direct | -1.82% | Disposed | 184.6% (price as of 2026-08-21) |
| March 8, 2024 | ACMR | S 10b5-1 | 15,000 | $30.36 | $455,400 | 874,524 Direct | -1.69% | Disposed | 158.3% (price as of 2026-08-21) |
| Nov. 29, 2023 | ACMR | S 10b5-1 | 18,984 | $17.25 | $327,474 | 855,090 Direct | -2.17% | Disposed | 354.7% (price as of 2026-08-21) |
| Nov. 22, 2023 | ACMR | S 10b5-1 | 15,000 | $17.66 | $264,900 | 874,074 Direct | -1.69% | Disposed | 344.1% (price as of 2026-08-21) |
| Aug. 22, 2023 | ACMR | S 10b5-1 | 32,098 | $13.85 | $444,557 | 855,090 Direct | -3.62% | Disposed | 466.3% (price as of 2026-08-21) |
| June 1, 2023 | ACMR | S 10b5-1 | 37,500 | $10.00 | $375,000 | 887,188 Direct | -4.06% | Disposed | 684.3% (price as of 2026-08-21) |
| March 16, 2023 | ACMR | S 10b5-1 | 37,500 | $12.06 | $452,250 | 889,116 Direct | -4.05% | Disposed | 550.3% (price as of 2026-08-21) |
| Nov. 30, 2022 | ACMR | S 10b5-1 | 35,327 | $8.43 | $297,807 | 890,620 Direct | -3.82% | Disposed | 830.4% (price as of 2026-08-21) |
| Aug. 22, 2022 | ACMR | S 10b5-1 | 36,537 | $16.10 | $588,246 | 855,090 Direct | -4.10% | Disposed | 387.1% (price as of 2026-08-21) |
| Aug. 15, 2022 | ACMR | S | 36,519 | $19.28 | $704,086 | 891,627 Direct | +4.27% | Acquired | 306.8% (price as of 2026-08-21) |
| May 27, 2022 | ACMR | S 10b5-1 | 36,150 | $15.00 | $542,250 | 855,090 Direct | -4.06% | Disposed | 422.9% (price as of 2026-08-21) |
| March 9, 2022 | ACMR | S 10b5-1 | 3,000 | $82.66 | $247,980 | 297,299 Direct | -1.00% | Disposed | 184.6% (price as of 2026-08-21) |
| March 9, 2022 | ACMR | S 10b5-1 | 8,069 | $82.11 | $662,546 | 300,299 Direct | -2.62% | Disposed | 186.6% (price as of 2026-08-21) |
| March 9, 2022 | ACMR | S 10b5-1 | 1,200 | $80.48 | $96,576 | 308,368 Direct | -0.39% | Disposed | 192.4% (price as of 2026-08-21) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Aug. 18, 2026 | ACMR | Stock Option | Class A Common Stock (5,000) | $5.60 | April 22, 2029 | 5,000 | Disposed |
| May 19, 2026 | ACMR | Stock Option | Class A Common Stock (5,000) | $5.60 | April 22, 2029 | 5,000 | Disposed |
| March 9, 2026 | ACMR | Stock Option | Class A Common Stock (5,000) | $5.60 | April 22, 2029 | 5,000 | Disposed |
| Aug. 12, 2025 | ACMR | Stock Option | Class A Common Stock (20,000) | $24.93 | Aug. 11, 2035 | 20,000 | Acquired |
| March 3, 2025 | ACMR | Stock Option | Class A Common Stock (25,001) | $0.50 | April 30, 2025 | 25,001 | Disposed |
| Nov. 14, 2024 | ACMR | Stock Option | Class A Common Stock (35,000) | $0.50 | April 30, 2025 | 35,000 | Disposed |
| Aug. 14, 2024 | ACMR | Stock Option | Class A Common Stock (35,000) | $0.50 | April 30, 2025 | 35,000 | Disposed |
| Aug. 12, 2024 | ACMR | Stock Option | Class A Common Stock (20,000) | $18.89 | Aug. 11, 2034 | 20,000 | Acquired |
| May 14, 2024 | ACMR | Stock Option | Class A Common Stock (35,000) | $0.50 | April 30, 2025 | 35,000 | Disposed |
| March 1, 2024 | ACMR | Stock Option | Class A Common Stock (35,000) | $0.50 | April 30, 2025 | 35,000 | Disposed |
| Nov. 14, 2023 | ACMR | Stock Option | Class A Common Stock (35,000) | $0.50 | April 30, 2025 | 35,000 | Disposed |
| Aug. 10, 2023 | ACMR | Stock Option | Class A Common Stock (24,000) | — | Aug. 9, 2033 | 24,000 | Disposed |
| Aug. 10, 2023 | ACMR | Stock Option | Class A Common Stock (30,000) | — | Aug. 9, 2033 | 30,000 | Disposed |
| Aug. 10, 2023 | ACMR | Stock Option | Class A Common Stock (24,000) | $13.24 | Aug. 9, 2033 | 24,000 | Disposed |
| Aug. 10, 2023 | ACMR | Stock Option | Class A Common Stock (30,000) | $13.24 | Aug. 9, 2033 | 30,000 | Disposed |
| May 22, 2023 | ACMR | Stock Option | Class A Common Stock (37,500) | $0.50 | April 30, 2025 | 37,500 | Disposed |
| March 9, 2023 | ACMR | Stock Option | Class A Common Stock (37,500) | $0.50 | April 30, 2025 | 37,500 | Disposed |
| Nov. 22, 2022 | ACMR | Stock Option | Class A Common Stock (37,500) | $0.50 | May 1, 2025 | 37,500 | Disposed |
| Nov. 14, 2022 | ACMR | Stock Option | Class A Common Stock (37,500) | $0.50 | May 1, 2025 | 37,500 | Disposed |
| Aug. 15, 2022 | ACMR | Stock Option | Class A Common Stock (37,500) | $0.50 | May 1, 2025 | 37,500 | Disposed |
| Aug. 8, 2022 | ACMR | Stock Option | Class A Common Stock (37,500) | $0.50 | May 1, 2025 | 37,500 | Disposed |
| June 30, 2022 | ACMR | Stock Option | Class A Common Stock (24,000) | $16.83 | June 29, 2032 | 24,000 | Acquired |
| May 18, 2022 | ACMR | Stock Option | Class A Common Stock (37,500) | $1.50 | May 1, 2025 | 37,500 | Disposed |
| March 9, 2022 | ACMR | Stock Option | Class A Common Stock (231) | $1.50 | May 1, 2025 | 12,269 | Disposed |
| March 2, 2022 | ACMR | Stock Option | Class A Common Stock (12,500) | $1.50 | May 1, 2025 | 12,500 | Disposed |
| Feb. 22, 2021 | ACMR | Stock Option | Class A Common Stock (5,000) | — | Feb. 21, 2031 | 5,000 | Acquired |
| Feb. 22, 2021 | ACMR | Stock Option | Class A Common Stock (5,000) | $119.98 | Feb. 21, 2031 | 5,000 | Acquired |
| March 20, 2020 | ACMR | Stock Option | Class A Common Stock (10,000) | $22.07 | March 19, 2030 | 10,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 3 holdings
Securities held when first becoming an insider, per SEC Form 3.