Rong Zhou
CIK 1645326 · View on SEC EDGAR ↗
Insider
First SEC filing: June 17, 2015 · Latest: June 17, 2015
On this page
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
- Compensation Executive pay disclosed in company proxy statements.
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 76 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
76 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Dec. 13, 2024 | AMPH | S | 8,000 | $45.23 | $361,840 | 118,469 Direct | -6.33% | Disposed | -52.2% (price as of 2026-08-21) |
| Dec. 12, 2024 | AMPH | S | 7,000 | $44.42 | $310,940 | 118,469 Direct | -5.58% | Disposed | -51.4% (price as of 2026-08-21) |
| Nov. 12, 2024 | AMPH | S | 6,893 | $48.88 | $336,930 | 118,388 Direct | -5.50% | Disposed | -55.8% (price as of 2026-08-21) |
| Sept. 13, 2024 | AMPH | S | 3,000 | $48.26 | $144,780 | 118,388 Direct | -2.47% | Disposed | -55.2% (price as of 2026-08-21) |
| Aug. 26, 2024 | AMPH | S | 4,000 | $48.35 | $193,400 | 118,388 Direct | -3.27% | Disposed | -55.3% (price as of 2026-08-21) |
| Dec. 4, 2023 | AMPH | S | 3,514 | $59.58 | $209,364 | 112,420 Direct | -3.03% | Disposed | -63.7% (price as of 2026-08-21) |
| Dec. 1, 2023 | AMPH | S | 4,316 | $58.58 | $252,831 | 112,420 Direct | -3.70% | Disposed | -63.1% (price as of 2026-08-21) |
| June 15, 2023 | AMPH | S | 5,000 | $51.79 | $258,950 | 96,888 Direct | -4.91% | Disposed | -58.3% (price as of 2026-08-21) |
| June 13, 2023 | AMPH | S | 5,000 | $48.24 | $241,200 | 88,313 Direct | -5.36% | Disposed | -55.2% (price as of 2026-08-21) |
| May 18, 2023 | AMPH | S | 10,000 | $44.20 | $442,000 | 87,598 Direct | -10.25% | Disposed | -51.1% (price as of 2026-08-21) |
| Feb. 25, 2022 | AMPH | S 10b5-1 | 13,246 | $28.77 | $381,087 | 70,307 Direct | -15.85% | Disposed | -24.9% (price as of 2026-08-21) |
| Feb. 8, 2022 | AMPH | S 10b5-1 | 7,000 | $26.77 | $187,390 | 76,553 Direct | -8.38% | Disposed | -19.3% (price as of 2026-08-21) |
| Jan. 10, 2022 | AMPH | S 10b5-1 | 10,251 | $25.77 | $264,168 | 76,553 Direct | -11.81% | Disposed | -16.2% (price as of 2026-08-21) |
| Jan. 10, 2022 | AMPH | S 10b5-1 | 10,677 | $24.96 | $266,498 | 86,804 Direct | -10.95% | Disposed | -13.5% (price as of 2026-08-21) |
| Nov. 11, 2021 | AMPH | S 10b5-1 | 7,813 | $21.67 | $169,308 | 83,121 Direct | -8.59% | Disposed | -0.3% (price as of 2026-08-21) |
| Aug. 2, 2021 | AMPH | S 10b5-1 | 9,123 | $21.24 | $193,773 | 83,121 Direct | -9.89% | Disposed | 1.7% (price as of 2026-08-21) |
| July 26, 2021 | AMPH | S 10b5-1 | 6,000 | $20.87 | $125,220 | 86,244 Direct | -6.50% | Disposed | 3.5% (price as of 2026-08-21) |
| July 20, 2021 | AMPH | S 10b5-1 | 5,187 | $20.57 | $106,697 | 86,244 Direct | -5.67% | Disposed | 5.0% (price as of 2026-08-21) |
| June 9, 2021 | AMPH | S | 4,732 | $19.58 | $92,653 | 86,244 Direct | -5.20% | Disposed | 10.3% (price as of 2026-08-21) |
| June 8, 2021 | AMPH | S | 8,180 | $19.34 | $158,201 | 90,976 Direct | -8.25% | Disposed | 11.7% (price as of 2026-08-21) |
| May 14, 2021 | AMPH | S | 17,419 | $19.72 | $343,503 | 89,966 Direct | -16.22% | Disposed | 9.5% (price as of 2026-08-21) |
| May 13, 2021 | AMPH | S | 700 | $19.58 | $13,706 | 96,265 Direct | -0.72% | Disposed | 10.3% (price as of 2026-08-21) |
| June 4, 2020 | AMPH | S | 9,806 | $19.19 | $188,177 | 79,236 Direct | -11.01% | Disposed | 12.6% (price as of 2026-08-21) |
| June 3, 2020 | AMPH | S | 13,163 | $18.82 | $247,728 | 80,124 Direct | -14.11% | Disposed | 14.8% (price as of 2026-08-21) |
Showing latest 100 of 140 transactions
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 |
|---|---|---|---|---|---|---|---|
| Dec. 13, 2024 | AMPH | Employee Stock Option (right to buy) | Common Stock (8,000) | $11.33 | March 17, 2026 | 8,000 | Disposed |
| Dec. 12, 2024 | AMPH | Employee Stock Option (right to buy) | Common Stock (7,000) | $11.33 | March 17, 2026 | 7,000 | Disposed |
| Nov. 12, 2024 | AMPH | Employee Stock Option (right to buy) | Common Stock (6,893) | $14.95 | March 26, 2025 | 6,893 | Disposed |
| Sept. 13, 2024 | AMPH | Employee Stock Option (right to buy) | Common Stock (3,000) | $14.95 | March 26, 2025 | 3,000 | Disposed |
| Aug. 26, 2024 | AMPH | Employee Stock Option (right to buy) | Common Stock (4,000) | $14.95 | March 26, 2025 | 4,000 | Disposed |
| March 4, 2024 | AMPH | Employee Stock Option (right to buy) | Common Stock (26,378) | $46.68 | March 4, 2034 | 26,378 | Acquired |
| Dec. 4, 2023 | AMPH | Employee Stock Option (right to buy) | Common Stock (3,514) | $16.19 | June 15, 2025 | 3,514 | Disposed |
| Dec. 1, 2023 | AMPH | Employee Stock Option (right to buy) | Common Stock (4,316) | $14.40 | April 14, 2024 | 4,316 | Disposed |
| June 20, 2023 | AMPH | Employee Stock Option (right to buy) | Common Stock (9,651) | $11.33 | March 17, 2026 | 9,651 | Disposed |
| June 15, 2023 | AMPH | Employee Stock Option (right to buy) | Common Stock (1,171) | $16.19 | June 15, 2025 | 1,171 | Disposed |
| June 15, 2023 | AMPH | Employee Stock Option (right to buy) | Common Stock (4,631) | $14.95 | March 26, 2025 | 4,631 | Disposed |
| June 15, 2023 | AMPH | Employee Stock Option (right to buy) | Common Stock (13,575) | $14.40 | April 14, 2024 | 13,575 | Disposed |
| June 13, 2023 | AMPH | Employee Stock Option (right to buy) | Common Stock (5,000) | $14.40 | April 14, 2024 | 5,000 | Disposed |
| May 18, 2023 | AMPH | Employee Stock Option (right to buy) | Common Stock (10,000) | $14.40 | April 14, 2024 | 10,000 | Disposed |
| March 6, 2023 | AMPH | Employee Stock Option (right to buy) | Common Stock (31,882) | $35.13 | March 6, 2033 | 31,882 | Acquired |
| March 15, 2022 | AMPH | Employee Stock Option (right to buy) | Common Stock (31,516) | $34.74 | March 15, 2032 | 31,516 | Acquired |
| Feb. 25, 2022 | AMPH | Employee Stock Option (right to buy) | Common Stock (7,000) | $10.93 | July 30, 2023 | 7,000 | Disposed |
| Feb. 8, 2022 | AMPH | Employee Stock Option (right to buy) | Common Stock (7,000) | $10.93 | July 30, 2023 | 7,000 | Disposed |
| Jan. 10, 2022 | AMPH | Employee Stock Option (right to buy) | Common Stock (14,000) | $10.93 | July 30, 2023 | 14,000 | Disposed |
| Nov. 11, 2021 | AMPH | Employee Stock Option (right to buy) | Common Stock (7,813) | $10.48 | Nov. 7, 2022 | 7,813 | Disposed |
| Aug. 2, 2021 | AMPH | Employee Stock Option (right to buy) | Common Stock (6,000) | $10.48 | Nov. 7, 2022 | 6,000 | Disposed |
| July 26, 2021 | AMPH | Employee Stock Option (right to buy) | Common Stock (6,000) | $10.48 | Nov. 7, 2022 | 6,000 | Disposed |
| July 20, 2021 | AMPH | Employee Stock Option (right to buy) | Common Stock (5,187) | $10.48 | Nov. 7, 2022 | 5,187 | Disposed |
| June 8, 2021 | AMPH | Employee Stock Option (right to buy) | Common Stock (8,180) | $14.23 | Dec. 22, 2021 | 8,180 | Disposed |
| May 14, 2021 | AMPH | Employee Stock Option (right to buy) | Common Stock (11,120) | $14.23 | Dec. 22, 2021 | 11,120 | Disposed |
| May 13, 2021 | AMPH | Employee Stock Option (right to buy) | Common Stock (700) | $14.23 | Dec. 22, 2021 | 700 | Disposed |
| March 17, 2021 | AMPH | Employee Stock Option (right to buy) | Common Stock (51,621) | $17.99 | March 17, 2031 | 51,621 | Acquired |
| June 4, 2020 | AMPH | Employee Stock Option (right to buy) | Common Stock (8,918) | $11.41 | March 8, 2021 | 8,918 | Disposed |
| June 3, 2020 | AMPH | Employee Stock Option (right to buy) | Common Stock (11,082) | $11.41 | March 8, 2021 | 11,082 | Disposed |
| March 16, 2020 | AMPH | Employee Stock Option (right to buy) | Common Stock (61,822) | $13.03 | March 16, 2030 | 61,822 | Acquired |
| May 6, 2019 | AMPH | Employee Stock Option (right to buy) | Common Stock (9,600) | $20.26 | Aug. 5, 2019 | 9,600 | Disposed |
| March 15, 2019 | AMPH | Employee Stock Option (right to buy) | Common Stock (22,541) | $20.23 | March 15, 2029 | 22,541 | Acquired |
| March 1, 2019 | AMPH | Employee Stock Option (right to buy) | Common Stock (3,200) | $20.26 | Aug. 5, 2019 | 3,200 | Disposed |
| Feb. 5, 2019 | AMPH | Employee Stock Option (right to buy) | Common Stock (3,200) | $20.26 | Aug. 5, 2019 | 3,200 | Disposed |
| Feb. 5, 2019 | AMPH | Employee Stock Option (right to buy) | Common Stock (3,200) | $20.26 | Aug. 5, 2019 | 3,200 | Disposed |
| March 15, 2018 | AMPH | Employee Stock Option (right to buy) | Common Stock (20,827) | $19.79 | March 15, 2028 | 20,827 | Acquired |
| March 16, 2017 | AMPH | Employee Stock Option (right to buy) | Common Stock (29,424) | $13.35 | March 16, 2027 | 29,424 | Acquired |
| March 17, 2016 | AMPH | Employee Stock Option (right to buy) | Common Stock (34,438) | $11.33 | March 17, 2026 | 34,438 | Acquired |
| June 15, 2015 | AMPH | Employee Stock Option (right to buy) | Common Stock (4,685) | $16.19 | June 15, 2025 | 4,685 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 13 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| June 17, 2015 | AMPH | Common Stock | — | Direct |
| June 17, 2015 | AMPH | Common Stock | 99,668 | Indirect |
| June 17, 2015 | AMPH | Common Stock | 5,000 | Indirect |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (12,000) | 12,000 | Direct |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (24,000) | 24,000 | Direct |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (16,000) | 16,000 | Direct |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (16,000) | 16,000 | Direct |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (20,000) | 20,000 | Direct |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (20,000) | 20,000 | Direct |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (25,000) | 25,000 | Direct |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (28,000) | 28,000 | Direct |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (32,891) | 32,891 | Direct |
| June 17, 2015 | AMPH | Employee stock option (right to buy)→ Common Stock (18,524) | 18,524 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $717,587 | $280,475 | — | — | $98,000 | — | $43,559 | $2,542,634 |
| 2024 | $564,476 | $235,076 | — | — | $116,000 | — | $43,361 | $2,127,918 |
| 2023 | $542,334 | $209,876 | — | — | $167,000 | — | $43,087 | $2,025,312 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.