Yajing Chen
Insider
First SEC filing: July 17, 2023 · Latest: July 17, 2023
Insider at
Insider transactions
0 buys (P)
7 sells (S)
Net: $-223,642
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 19, 2026 | ZLAB | S 10b5-1 | 260 | $27.00 | $7,020 | 35,635 Direct | -0.72% | Disposed | -9.9% (price as of 2026-10-02) |
| Aug. 14, 2026 | ZLAB | M | 1,250 | · | · | 36,322 Direct | +3.56% | Acquired | (price as of 2026-10-02) |
| Aug. 14, 2026 | ZLAB | F | 427 | $25.90 | $11,059 | 35,895 Direct | -1.18% | Disposed | -6.1% (price as of 2026-10-02) |
| Aug. 14, 2026 | ZLAB | M | 1,250 | · | · | 1,250 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| Aug. 11, 2026 | ZLAB | S 10b5-1 | 619 | $25.00 | $15,475 | 35,072 Direct | -1.73% | Disposed | -2.7% (price as of 2026-10-02) |
| June 26, 2026 | ZLAB | S | 2,264 | $17.46 | $39,529 | 35,691 Direct | -5.96% | Disposed | 39.3% (price as of 2026-10-02) |
| June 25, 2026 | ZLAB | M | 6,250 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| June 25, 2026 | ZLAB | M | 6,250 | · | · | 37,955 Direct | +19.71% | Acquired | (price as of 2026-10-02) |
| April 6, 2026 | ZLAB | S | 853 | $20.45 | $17,444 | 31,705 Direct | -2.62% | Disposed | 19.0% (price as of 2026-10-02) |
| April 2, 2026 | ZLAB | M | 2,500 | · | · | 2,500 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| April 2, 2026 | ZLAB | S | 5,199 | $20.39 | $106,008 | 32,558 Direct | -13.77% | Disposed | 19.3% (price as of 2026-10-02) |
| April 2, 2026 | ZLAB | M | 2,500 | · | · | 37,757 Direct | +7.09% | Acquired | (price as of 2026-10-02) |
| April 1, 2026 | ZLAB | M | 13,758 | · | · | 27,516 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| April 1, 2026 | ZLAB | M | 1,500 | · | · | 1,500 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| April 1, 2026 | ZLAB | M | 13,758 | · | · | 35,257 Direct | +63.99% | Acquired | (price as of 2026-10-02) |
| April 1, 2026 | ZLAB | M | 1,500 | · | · | 21,499 Direct | +7.50% | Acquired | (price as of 2026-10-02) |
| March 13, 2026 | ZLAB | S | 1,703 | $18.63 | $31,727 | 19,999 Direct | -7.85% | Disposed | 30.6% (price as of 2026-10-02) |
| March 12, 2026 | ZLAB | M | 4,258 | · | · | 12,777 Direct | -25.00% | Disposed | (price as of 2026-10-02) |
| March 12, 2026 | ZLAB | M | 4,258 | · | · | 21,702 Direct | +24.41% | Acquired | (price as of 2026-10-02) |
| March 4, 2026 | ZLAB | A | 11,924 | · | · | 11,924 Direct | · | Acquired | (price as of 2026-10-02) |
| March 4, 2026 | ZLAB | A | 27,027 | · | · | 27,027 Direct | · | Acquired | (price as of 2026-10-02) |
| March 4, 2026 | ZLAB | A | 83,160 | · | · | 83,160 Direct | · | Acquired | (price as of 2026-10-02) |
| Nov. 3, 2025 | ZLAB | S | 240 | $26.83 | $6,439 | 17,444 Direct | -1.36% | Disposed | -9.3% (price as of 2026-10-02) |
| Oct. 31, 2025 | ZLAB | M | 500 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Oct. 31, 2025 | ZLAB | M | 500 | · | · | 17,684 Direct | +2.91% | Acquired | (price as of 2026-10-02) |
| Oct. 2, 2025 | ZLAB | S | 456 | $34.25 | $15,618 | 17,184 Direct | -2.59% | Disposed | -29.0% (price as of 2026-10-02) |
| Oct. 1, 2025 | ZLAB | M | 920 | · | · | 920 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| Oct. 1, 2025 | ZLAB | M | 920 | · | · | 17,640 Direct | +5.50% | Acquired | (price as of 2026-10-02) |
| Aug. 15, 2025 | ZLAB | S 10b5-1 | 828 | $35.53 | $29,419 | 16,720 Direct | -4.72% | Disposed | -31.5% (price as of 2026-10-02) |
| Aug. 15, 2025 | ZLAB | S 10b5-1 | 610 | $35.27 | $21,515 | 17,548 Direct | -3.36% | Disposed | -31.0% (price as of 2026-10-02) |
| Aug. 14, 2025 | ZLAB | M | 1,250 | · | · | 2,500 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| Aug. 14, 2025 | ZLAB | M | 1,250 | · | · | 18,158 Direct | +7.39% | Acquired | (price as of 2026-10-02) |
| Aug. 8, 2025 | ZLAB | S 10b5-1 | 4,096 | $34.01 | $139,305 | 16,908 Direct | -19.50% | Disposed | -28.5% (price as of 2026-10-02) |
| June 26, 2025 | ZLAB | S | 2,675 | $36.13 | $96,648 | 21,004 Direct | -11.30% | Disposed | -32.7% (price as of 2026-10-02) |
| June 25, 2025 | ZLAB | M | 6,250 | · | · | 6,250 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| June 25, 2025 | ZLAB | M | 6,250 | · | · | 23,679 Direct | +35.86% | Acquired | (price as of 2026-10-02) |
| June 2, 2025 | ZLAB | S 10b5-1 | 9,618 | $30.00 | $288,540 | 17,429 Direct | -35.56% | Disposed | -18.9% (price as of 2026-10-02) |
| April 4, 2025 | ZLAB | S | 924 | $33.11 | $30,594 | 27,047 Direct | -3.30% | Disposed | -26.5% (price as of 2026-10-02) |
| April 3, 2025 | ZLAB | M | 2,500 | · | · | 5,000 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| April 3, 2025 | ZLAB | M | 2,500 | · | · | 27,971 Direct | +9.82% | Acquired | (price as of 2026-10-02) |
| April 2, 2025 | ZLAB | S | 5,280 | $35.89 | $189,499 | 25,471 Direct | -17.17% | Disposed | -32.2% (price as of 2026-10-02) |
| April 1, 2025 | ZLAB | M | 13,757 | · | · | 41,274 Direct | -25.00% | Disposed | (price as of 2026-10-02) |
| April 1, 2025 | ZLAB | M | 1,500 | · | · | 3,000 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| April 1, 2025 | ZLAB | M | 13,757 | · | · | 30,751 Direct | +80.95% | Acquired | (price as of 2026-10-02) |
| April 1, 2025 | ZLAB | M | 1,500 | · | · | 16,994 Direct | +9.68% | Acquired | (price as of 2026-10-02) |
| March 12, 2025 | ZLAB | A | 17,035 | · | · | 17,035 Direct | · | Acquired | (price as of 2026-10-02) |
| March 12, 2025 | ZLAB | A | 52,418 | · | · | 52,418 Direct | · | Acquired | (price as of 2026-10-02) |
| Nov. 4, 2024 | ZLAB | S | 167 | $30.66 | $5,120 | 15,494 Direct | -1.07% | Disposed | -20.6% (price as of 2026-10-02) |
| Nov. 1, 2024 | ZLAB | M | 500 | · | · | 500 Direct | -50.00% | Disposed | (price as of 2026-10-02) |
| Nov. 1, 2024 | ZLAB | M | 500 | · | · | 15,661 Direct | +3.30% | Acquired | (price as of 2026-10-02) |
| Oct. 2, 2024 | ZLAB | S | 301 | $25.40 | $7,645 | 15,161 Direct | -1.95% | Disposed | -4.2% (price as of 2026-10-02) |
| Oct. 1, 2024 | ZLAB | M | 920 | · | · | 1,840 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| Oct. 1, 2024 | ZLAB | M | 920 | · | · | 15,462 Direct | +6.33% | Acquired | (price as of 2026-10-02) |
| Aug. 15, 2024 | ZLAB | S | 422 | $16.06 | $6,777 | 14,542 Direct | -2.82% | Disposed | 51.5% (price as of 2026-10-02) |
| Aug. 14, 2024 | ZLAB | M | 1,250 | · | · | 14,964 Direct | +9.11% | Acquired | (price as of 2026-10-02) |
| Aug. 14, 2024 | ZLAB | M | 1,250 | · | · | 3,750 Direct | -25.00% | Disposed | (price as of 2026-10-02) |
| June 26, 2024 | ZLAB | S | 2,154 | $17.90 | $38,557 | 13,714 Direct | -13.57% | Disposed | 35.9% (price as of 2026-10-02) |
| June 25, 2024 | ZLAB | M | 6,250 | · | · | 12,500 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| June 25, 2024 | ZLAB | M | 6,250 | · | · | 15,868 Direct | +64.98% | Acquired | (price as of 2026-10-02) |
| April 4, 2024 | ZLAB | S | 845 | $15.67 | $13,241 | 9,618 Direct | -8.08% | Disposed | 55.3% (price as of 2026-10-02) |
| April 3, 2024 | ZLAB | M | 2,500 | · | · | 7,500 Direct | -25.00% | Disposed | (price as of 2026-10-02) |
| April 3, 2024 | ZLAB | M | 2,500 | $15.90 | $39,750 | 10,463 Direct | +31.40% | Acquired | 53.0% (price as of 2026-10-02) |
| April 2, 2024 | ZLAB | S | 519 | $16.15 | $8,382 | 7,963 Direct | -6.12% | Disposed | 50.7% (price as of 2026-10-02) |
| April 1, 2024 | ZLAB | M | 1,500 | · | · | 4,500 Direct | -25.00% | Disposed | (price as of 2026-10-02) |
| April 1, 2024 | ZLAB | A | 55,031 | · | · | 55,031 Direct | · | Acquired | (price as of 2026-10-02) |
| April 1, 2024 | ZLAB | A | 84,663 | · | · | 84,663 Direct | · | Acquired | (price as of 2026-10-02) |
| April 1, 2024 | ZLAB | M | 1,500 | $16.72 | $25,080 | 8,482 Direct | +21.48% | Acquired | 45.5% (price as of 2026-10-02) |
| Nov. 2, 2023 | ZLAB | S | 165 | $25.23 | $4,163 | 6,982 Direct | -2.31% | Disposed | -3.6% (price as of 2026-10-02) |
| Nov. 1, 2023 | ZLAB | M | 500 | · | · | 1,000 Direct | -33.33% | Disposed | (price as of 2026-10-02) |
| Nov. 1, 2023 | ZLAB | M | 500 | · | · | 7,147 Direct | +7.52% | Acquired | (price as of 2026-10-02) |
| Sept. 29, 2023 | ZLAB | M | 920 | · | · | 2,760 Direct | -25.00% | Disposed | (price as of 2026-10-02) |
| Sept. 29, 2023 | ZLAB | F | 307 | $24.31 | $7,463 | 6,647 Direct | -4.41% | Disposed | 0.1% (price as of 2026-10-02) |
| Sept. 29, 2023 | ZLAB | M | 920 | · | · | 6,954 Direct | +15.25% | Acquired | (price as of 2026-10-02) |
| Aug. 14, 2023 | ZLAB | A | 5,000 | · | · | 5,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Aug. 14, 2023 | ZLAB | A | 20,000 | · | · | 20,000 Direct | · | Acquired | (price as of 2026-10-02) |
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. 14, 2026 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 1,250 | Disposed |
| June 25, 2026 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 6,250 | Disposed |
| April 2, 2026 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 2,500 | Disposed |
| April 1, 2026 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 13,758 | Disposed |
| April 1, 2026 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 1,500 | Disposed |
| March 12, 2026 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 4,258 | Disposed |
| March 4, 2026 | ZLAB | Performance-Based Share Units | American Depositary Shares [F1] | · | · | 11,924 | Acquired |
| March 4, 2026 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 27,027 | Acquired |
| March 4, 2026 | ZLAB | Stock Options (Right to Buy) | American Depositary Shares [F1] | $19.27 | March 4, 2036 | 83,160 | Acquired |
| Oct. 31, 2025 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 500 | Disposed |
| Oct. 1, 2025 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 920 | Disposed |
| Aug. 14, 2025 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 1,250 | Disposed |
| June 25, 2025 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 6,250 | Disposed |
| April 3, 2025 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 2,500 | Disposed |
| April 1, 2025 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 13,757 | Disposed |
| April 1, 2025 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 1,500 | Disposed |
| March 12, 2025 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 17,035 | Acquired |
| March 12, 2025 | ZLAB | Stock Options (Right to Buy) | American Depositary Shares [F1] | $35.55 | March 12, 2035 | 52,418 | Acquired |
| Nov. 1, 2024 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 500 | Disposed |
| Oct. 1, 2024 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 920 | Disposed |
| Aug. 14, 2024 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 1,250 | Disposed |
| June 25, 2024 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 6,250 | Disposed |
| April 3, 2024 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 2,500 | Disposed |
| April 1, 2024 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 1,500 | Disposed |
| April 1, 2024 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 55,031 | Acquired |
| April 1, 2024 | ZLAB | Stock Options (Right to Buy) [F4] | American Depositary Shares [F1] | $16.72 | April 1, 2034 | 84,663 | Acquired |
| Nov. 1, 2023 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 500 | Disposed |
| Sept. 29, 2023 | ZLAB | Restricted Share Units | American Depositary Shares [F1] | · | · | 920 | Disposed |
| Aug. 14, 2023 | ZLAB | Restricted Share Units | American Depositary Shares [F3] | · | · | 5,000 | Acquired |
| Aug. 14, 2023 | ZLAB | Stock Option (Right to Buy) [F1] | American Depositary Shares [F3] | $25.71 | Aug. 14, 2033 | 20,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 5 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| July 17, 2023 | ZLAB | American Depositary Shares | 45,964 | Direct |
| July 17, 2023 | ZLAB | Stock Option (Right to Buy) [F1] | 8,000 | Direct |
| July 17, 2023 | ZLAB | Stock Option (Right to Buy) [F1] | 5,000 | Direct |
| July 17, 2023 | ZLAB | Stock Option (Right to Buy) [F1] | 20,000 | Direct |
| July 17, 2023 | ZLAB | Stock Option (Right to Buy) [F1] | 26,000 | Direct |