Zai Lab (ZLAB)
Zai Lab on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as pharmaceutical preparations.
8.8M
Short interest
settlement 2026-10-15
11.3
Days to cover
+2.2 days vs prior
38.5%
Short share of volume
2026-11-03
18,422
Fails to deliver
settlement 2026-10-13
Thu 5 Nov
Next earnings
estimated date
-$235K
Insider flow, 90 days
0 buys, 3 sells
As of 2026-11-03.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 15 October 2026, short interest in ZLAB is 8,843,854 shares, up 686,975 shares over the last month. Over the last 48 readings it ranged from 3,371,454 shares (13 February 2026) to 8,843,854 shares (15 October 2026). The latest reading sits at the top of that range. At the reported average volume of 784K shares a day that is 11.3 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 8,843,854 | +23.7% | 783,731 | 11.28 |
| 2026-09-30 | 7,149,727 | -12.3% | 791,166 | 9.04 |
| 2026-09-15 | 8,156,879 | +1.7% | 888,062 | 9.19 |
| 2026-08-31 | 8,017,185 | +7.4% | 1,093,028 | 7.33 |
| 2026-08-14 | 7,465,887 | +14.3% | 1,395,794 | 5.35 |
| 2026-07-31 | 6,534,451 | +2.9% | 602,393 | 10.85 |
| 2026-07-15 | 6,351,893 | -22.1% | 848,087 | 7.49 |
| 2026-06-30 | 8,154,038 | +12.5% | 1,023,356 | 7.97 |
| 2026-06-15 | 7,250,668 | +11.0% | 1,093,348 | 6.63 |
| 2026-05-29 | 6,532,695 | +25.9% | 769,502 | 8.49 |
| 2026-05-15 | 5,187,168 | +16.5% | 766,967 | 6.76 |
| 2026-04-30 | 4,453,973 | -19.0% | 866,529 | 5.14 |
| 2026-04-15 | 5,497,720 | +3.1% | 790,299 | 6.96 |
| 2026-03-31 | 5,332,652 | +9.0% | 785,312 | 6.79 |
| 2026-03-13 | 4,890,948 | +28.7% | 675,085 | 7.24 |
| 2026-02-27 | 3,800,411 | +12.7% | 397,889 | 9.55 |
| 2026-02-13 | 3,371,454 | -6.0% | 841,154 | 4.01 |
| 2026-01-30 | 3,588,257 | -7.3% | 656,356 | 5.47 |
| 2026-01-15 | 3,870,954 | -8.9% | 921,534 | 4.20 |
| 2025-12-31 | 4,248,996 | -19.8% | 875,914 | 4.85 |
| 2025-12-15 | 5,300,558 | +5.2% | 764,964 | 6.93 |
| 2025-11-28 | 5,037,867 | +9.4% | 929,641 | 5.42 |
| 2025-11-14 | 4,603,118 | -8.4% | 984,993 | 4.67 |
| 2025-10-31 | 5,022,907 | +4.4% | 909,279 | 5.52 |
| 2025-10-15 | 4,811,176 | -1.8% | 474,108 | 10.15 |
| 2025-09-30 | 4,899,193 | +0.3% | 598,031 | 8.19 |
| 2025-09-15 | 4,882,056 | +2.9% | 1,148,604 | 4.25 |
| 2025-08-29 | 4,742,504 | -0.7% | 493,194 | 9.62 |
| 2025-08-15 | 4,777,364 | +4.5% | 573,510 | 8.33 |
| 2025-07-31 | 4,573,915 | +14.9% | 930,481 | 4.92 |
| 2025-07-15 | 3,982,298 | -1.7% | 625,274 | 6.37 |
| 2025-06-30 | 4,052,218 | -7.7% | 806,746 | 5.02 |
| 2025-06-13 | 4,388,732 | -14.1% | 1,199,165 | 3.66 |
| 2025-05-30 | 5,109,230 | +2.7% | 853,549 | 5.99 |
| 2025-05-15 | 4,975,515 | -25.2% | 966,254 | 5.15 |
| 2025-04-30 | 6,648,753 | -14.4% | 1,070,778 | 6.21 |
| 2025-04-15 | 7,770,485 | +6.1% | 2,109,278 | 3.68 |
| 2025-03-31 | 7,323,782 | -7.5% | 861,731 | 8.50 |
| 2025-03-14 | 7,920,858 | +1.2% | 1,017,203 | 7.79 |
| 2025-02-28 | 7,828,888 | +3.3% | 1,710,878 | 4.58 |
| 2025-02-14 | 7,577,556 | -1.8% | 607,707 | 12.47 |
| 2025-01-31 | 7,714,353 | +27.5% | 577,688 | 13.35 |
| 2025-01-15 | 6,051,368 | +1.9% | 632,459 | 9.57 |
| 2024-12-31 | 5,938,836 | +1.6% | 368,764 | 16.10 |
| 2024-12-13 | 5,845,957 | +13.2% | 810,809 | 7.21 |
| 2024-11-29 | 5,166,211 | +5.7% | 1,300,676 | 3.97 |
| 2024-11-15 | 4,887,020 | +4.8% | 1,289,408 | 3.79 |
| 2024-10-31 | 4,661,994 | -1.8% | 1,088,339 | 4.28 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 3 November 2026, the short share of ZLAB volume is 38.5%, down 32.4 points over the last five sessions. Over the last 30 readings it ranged from 11.5% (30 September 2026) to 80.0% (5 October 2026). The latest reading is 14.7 points below the 30-session average of 53.2%, on 272K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-03 | 105K | 272K | 38.5% | 66 |
| 2026-11-02 | 123K | 193K | 63.4% | 0 |
| 2026-10-30 | 116K | 217K | 53.4% | 0 |
| 2026-10-29 | 147K | 236K | 62.3% | 0 |
| 2026-10-28 | 156K | 264K | 58.9% | 0 |
| 2026-10-27 | 461K | 649K | 70.9% | 0 |
| 2026-10-26 | 245K | 764K | 32.0% | 0 |
| 2026-10-23 | 388K | 1.6M | 24.8% | 30,780 |
| 2026-10-22 | 381K | 510K | 74.8% | 2,899 |
| 2026-10-21 | 363K | 558K | 65.0% | 38 |
| 2026-10-20 | 188K | 357K | 52.6% | 0 |
| 2026-10-19 | 93K | 120K | 77.1% | 0 |
| 2026-10-16 | 184K | 236K | 78.0% | 0 |
| 2026-10-15 | 168K | 298K | 56.3% | 0 |
| 2026-10-14 | 196K | 275K | 71.2% | 0 |
| 2026-10-13 | 232K | 297K | 78.2% | 0 |
| 2026-10-12 | 113K | 201K | 56.2% | 0 |
| 2026-10-09 | 136K | 651K | 20.9% | 0 |
| 2026-10-08 | 266K | 387K | 68.7% | 100 |
| 2026-10-07 | 41K | 88K | 46.7% | 0 |
| 2026-10-06 | 168K | 507K | 33.1% | 8 |
| 2026-10-05 | 191K | 238K | 80.0% | 0 |
| 2026-10-02 | 131K | 358K | 36.5% | 120 |
| 2026-10-01 | 88K | 160K | 55.0% | 0 |
| 2026-09-30 | 48K | 415K | 11.5% | 0 |
| 2026-09-29 | 81K | 224K | 36.1% | 0 |
| 2026-09-28 | 100K | 363K | 27.7% | 0 |
| 2026-09-25 | 65K | 112K | 58.0% | 1,700 |
| 2026-09-24 | 151K | 237K | 63.8% | 0 |
| 2026-09-23 | 182K | 412K | 44.1% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 13 October 2026, the fails-to-deliver balance in ZLAB is 18,422 shares, up 10,543 shares over the last settlement date. Over the last 30 readings it ranged from 32 shares (2 September 2026) to 48,223 shares (24 July 2026).
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-13 | 18,422 | $24.59 | $453K |
| 2026-10-09 | 7,879 | $24.81 | $195K |
| 2026-10-07 | 3,167 | $25.58 | $81K |
| 2026-09-25 | 4,000 | $25.28 | $101K |
| 2026-09-24 | 17,832 | $26.44 | $471K |
| 2026-09-21 | 1,344 | $25.70 | $35K |
| 2026-09-14 | 4,740 | $24.14 | $114K |
| 2026-09-11 | 2,240 | $24.17 | $54K |
| 2026-09-04 | 2,893 | $27.00 | $78K |
| 2026-09-02 | 32 | $25.30 | $810 |
| 2026-08-31 | 74 | $26.08 | $2K |
| 2026-08-27 | 39 | $26.03 | $1K |
| 2026-08-26 | 921 | $26.17 | $24K |
| 2026-08-25 | 341 | $25.64 | $9K |
| 2026-08-24 | 22,070 | $26.01 | $574K |
| 2026-08-17 | 25,154 | $25.90 | $651K |
| 2026-08-13 | 430 | $25.49 | $11K |
| 2026-08-12 | 317 | $26.00 | $8K |
| 2026-08-11 | 3,280 | $23.57 | $77K |
| 2026-08-10 | 11,054 | $23.32 | $258K |
| 2026-08-07 | 500 | $20.88 | $10K |
| 2026-08-06 | 1,733 | $18.37 | $32K |
| 2026-08-04 | 16,240 | $18.18 | $295K |
| 2026-08-03 | 265 | $18.27 | $5K |
| 2026-07-31 | 4,101 | $18.21 | $75K |
| 2026-07-24 | 48,223 | $19.68 | $949K |
| 2026-07-20 | 200 | $20.20 | $4K |
| 2026-07-17 | 349 | $20.75 | $7K |
| 2026-07-16 | 149 | $20.44 | $3K |
| 2026-07-13 | 1,855 | $20.49 | $38K |
Insider trades
SEC Form 4, newest first. JSONInsiders at ZLAB reported 3 open-market sells worth $235K in the last 90 days and no open-market buys. Latest filing: Chen Yajing (Chief Financial Officer) on 2026-10-01.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-01 | Chen Yajing | Chief Financial Officer | Tax withholding | 315 | $25.50 | $8K | 36K |
| 2026-10-01 | Chen Yajing | Chief Financial Officer | Exercise or conversion | 920 | price not stated in the filing | not stated | 37K |
| 2026-08-19 | Chen Yajing | Chief Financial Officer | Sell | 260 | $27.00 | $7K | 36K |
| 2026-08-14 | Chen Yajing | Chief Financial Officer | Tax withholding | 427 | $25.90 | $11K | 36K |
| 2026-08-14 | Chen Yajing | Chief Financial Officer | Exercise or conversion | 1K | price not stated in the filing | not stated | 36K |
| 2026-08-12 | Lis William | Director | Sell | 9K | $25.00 | $213K | 42K |
| 2026-08-11 | Chen Yajing | Chief Financial Officer | Sell | 619 | $25.00 | $15K | 35K |
| 2026-07-02 | Du Ying | Chairperson & CEO | Tax withholding | 4K | $19.12 | $83K | 1.2M |
| 2026-07-02 | Du Ying | Chairperson & CEO | Exercise or conversion | 11K | price not stated in the filing | not stated | 1.2M |
| 2026-07-01 | GAYNOR RICHARD | Director | Buy | 2K | $19.05 | $33K | 81K |
| 2026-07-01 | Du Ying | Chairperson & CEO | Tax withholding | 7K | $19.15 | $136K | 1.2M |
| 2026-07-01 | Du Ying | Chairperson & CEO | Exercise or conversion | 18K | price not stated in the filing | not stated | 1.2M |
| 2026-06-30 | Du Ying | Chairperson & CEO | Sell | 7K | $18.53 | $130K | 1.2M |
| 2026-06-29 | Du Ying | Chairperson & CEO | Exercise or conversion | 18K | price not stated in the filing | not stated | 1.2M |
| 2026-06-26 | Chen Yajing | Chief Financial Officer | Sell | 2K | $17.46 | $40K | 36K |
| 2026-06-26 | Du Ying | Chairperson & CEO | Sell | 25K | $17.46 | $429K | 1.2M |
| 2026-06-26 | Edmondson Frazor Titus III | Chief Legal Officer | Sell | 4K | $17.46 | $72K | 30K |
| 2026-06-25 | Chen Yajing | Chief Financial Officer | Exercise or conversion | 6K | price not stated in the filing | not stated | 38K |
| 2026-06-25 | Du Ying | Chairperson & CEO | Exercise or conversion | 59K | price not stated in the filing | not stated | 1.2M |
| 2026-06-25 | Edmondson Frazor Titus III | Chief Legal Officer | Exercise or conversion | 15K | price not stated in the filing | not stated | 34K |
| 2026-06-22 | Lis William | Director | Sell | 7K | $18.09 | $127K | 50K |
| 2026-06-17 | DIEKMAN JOHN D | Director | Grant | 22K | $0.00 | $0 | 122K |
| 2026-06-17 | Vounatsos Michel | Director | Grant | 22K | $0.00 | $0 | 73K |
| 2026-06-17 | Lis William | Director | Grant | 22K | $0.00 | $0 | 57K |
| 2026-06-17 | MOULDER LEON O JR | Director | Grant | 22K | $0.00 | $0 | 95K |
| 2026-06-17 | Leung Nisa | Director | Grant | 22K | $0.00 | $0 | 96K |
| 2026-06-17 | Morrison Scott W | Director | Grant | 22K | $0.00 | $0 | 57K |
| 2026-06-17 | WIRTH PETER | Director | Grant | 22K | $0.00 | $0 | 416K |
| 2026-06-17 | GAYNOR RICHARD | Director | Grant | 22K | $0.00 | $0 | 79K |
| 2026-05-27 | Du Ying | Chairperson & CEO | Gift | 54K | $0.00 | $0 | 1.2M |
| 2026-05-27 | Du Ying | Chairperson & CEO | Gift | 34K | $0.00 | $0 | 1.2M |
| 2026-05-26 | Du Ying | Chairperson & CEO | Gift | 20K | $0.00 | $0 | 1.2M |
| 2026-05-19 | Du Ying | Chairperson & CEO | Tax withholding | 117K | $18.75 | $2.2M | 1.3M |
| 2026-05-19 | Du Ying | Chairperson & CEO | Exercise or conversion | 261K | $1.74 | $454K | 1.4M |
| 2026-05-18 | Du Ying | Chairperson & CEO | Sell | 50K | $19.00 | $950K | 1.1M |
| 2026-05-18 | Du Ying | Chairperson & CEO | Exercise or conversion | 50K | $1.74 | $87K | 1.2M |
| 2026-05-15 | Du Ying | Chairperson & CEO | Sell | 50K | $20.74 | $1.0M | 1.1M |
| 2026-05-15 | Du Ying | Chairperson & CEO | Exercise or conversion | 50K | $1.74 | $87K | 1.2M |
| 2026-05-14 | Edmondson Frazor Titus III | Chief Legal Officer | Sell | 4K | $20.19 | $71K | 20K |
| 2026-05-14 | Du Ying | Chairperson & CEO | Sell | 50K | $20.09 | $1.0M | 1.1M |
| 2026-05-14 | Du Ying | Chairperson & CEO | Exercise or conversion | 50K | $1.74 | $87K | 1.2M |
| 2026-05-13 | Du Ying | Chairperson & CEO | Sell | 34K | $20.22 | $683K | 1.1M |
| 2026-05-13 | Du Ying | Chairperson & CEO | Sell | 16K | $19.44 | $316K | 1.2M |
| 2026-05-13 | Du Ying | Chairperson & CEO | Exercise or conversion | 50K | $1.74 | $87K | 1.2M |
| 2026-04-06 | Smiley Joshua L | See Remarks | Sell | 3K | $20.45 | $62K | 118K |
| 2026-04-06 | Edmondson Frazor Titus III | Chief Legal Officer | Sell | 1K | $20.45 | $25K | 23K |
| 2026-04-06 | Du Ying | Chairperson & CEO | Sell | 3K | $20.45 | $54K | 1.1M |
| 2026-04-06 | Chen Yajing | Chief Financial Officer | Sell | 853 | $20.45 | $17K | 32K |
| 2026-04-06 | Amado Rafael | See Remarks | Sell | 3K | $20.45 | $56K | 57K |
| 2026-04-02 | Amado Rafael | See Remarks | Exercise or conversion | 5K | price not stated in the filing | not stated | 70K |
| 2026-04-02 | Amado Rafael | See Remarks | Sell | 10K | $20.39 | $202K | 60K |
| 2026-04-02 | Chen Yajing | Chief Financial Officer | Sell | 5K | $20.39 | $106K | 33K |
| 2026-04-02 | Chen Yajing | Chief Financial Officer | Exercise or conversion | 3K | price not stated in the filing | not stated | 38K |
| 2026-04-02 | Du Ying | Chairperson & CEO | Exercise or conversion | 7K | price not stated in the filing | not stated | 1.1M |
| 2026-04-02 | Du Ying | Chairperson & CEO | Sell | 6K | $20.39 | $114K | 1.1M |
| 2026-04-02 | Edmondson Frazor Titus III | Chief Legal Officer | Sell | 4K | $20.39 | $86K | 25K |
| 2026-04-02 | Edmondson Frazor Titus III | Chief Legal Officer | Exercise or conversion | 5K | price not stated in the filing | not stated | 29K |
| 2026-04-02 | Smiley Joshua L | See Remarks | Exercise or conversion | 7K | price not stated in the filing | not stated | 130K |
| 2026-04-02 | Smiley Joshua L | See Remarks | Sell | 10K | $20.39 | $196K | 121K |
| 2026-04-01 | Amado Rafael | See Remarks | Exercise or conversion | 20K | price not stated in the filing | not stated | 64K |
| 2026-04-01 | Chen Yajing | Chief Financial Officer | Exercise or conversion | 2K | price not stated in the filing | not stated | 21K |
| 2026-04-01 | Chen Yajing | Chief Financial Officer | Exercise or conversion | 14K | price not stated in the filing | not stated | 35K |
| 2026-04-01 | Du Ying | Chairperson & CEO | Exercise or conversion | 11K | price not stated in the filing | not stated | 1.1M |
| 2026-04-01 | Du Ying | Chairperson & CEO | Exercise or conversion | 3K | price not stated in the filing | not stated | 1.1M |
| 2026-04-01 | Edmondson Frazor Titus III | Chief Legal Officer | Exercise or conversion | 3K | price not stated in the filing | not stated | 9K |
| 2026-04-01 | Edmondson Frazor Titus III | Chief Legal Officer | Exercise or conversion | 830 | price not stated in the filing | not stated | 10K |
| 2026-04-01 | Edmondson Frazor Titus III | Chief Legal Officer | Exercise or conversion | 14K | price not stated in the filing | not stated | 24K |
| 2026-04-01 | Smiley Joshua L | See Remarks | Exercise or conversion | 32K | price not stated in the filing | not stated | 123K |
| 2026-03-17 | GAYNOR RICHARD | Director | Buy | 2K | $18.91 | $33K | 57K |
| 2026-03-13 | Amado Rafael | See Remarks | Sell | 3K | $18.63 | $55K | 45K |
| 2026-03-13 | Chen Yajing | Chief Financial Officer | Sell | 2K | $18.63 | $32K | 20K |
| 2026-03-13 | Edmondson Frazor Titus III | Chief Legal Officer | Sell | 1K | $18.63 | $24K | 6K |
| 2026-03-13 | Smiley Joshua L | See Remarks | Sell | 2K | $18.63 | $37K | 91K |
| 2026-03-12 | Amado Rafael | See Remarks | Exercise or conversion | 5K | price not stated in the filing | not stated | 48K |
| 2026-03-12 | Chen Yajing | Chief Financial Officer | Exercise or conversion | 4K | price not stated in the filing | not stated | 22K |
| 2026-03-12 | Edmondson Frazor Titus III | Chief Legal Officer | Exercise or conversion | 4K | price not stated in the filing | not stated | 8K |
| 2026-03-12 | Smiley Joshua L | See Remarks | Exercise or conversion | 6K | price not stated in the filing | not stated | 93K |
| 2026-03-11 | Du Ying | Chairperson & CEO | Sell | 1K | $19.08 | $20K | 1.1M |
| 2026-03-10 | Du Ying | Chairperson & CEO | Exercise or conversion | 3K | price not stated in the filing | not stated | 1.1M |
| 2026-03-10 | Du Ying | Chairperson & CEO | Tax withholding | 117K | $19.41 | $2.3M | 1.1M |
| 2026-03-10 | Du Ying | Chairperson & CEO | Exercise or conversion | 261K | $1.74 | $454K | 1.2M |
| 2026-03-09 | Du Ying | Chairperson & CEO | Sell | 50K | $19.03 | $951K | 964K |
| 2026-03-09 | Du Ying | Chairperson & CEO | Exercise or conversion | 50K | $1.74 | $87K | 1.0M |
| 2026-03-06 | Du Ying | Chairperson & CEO | Sell | 50K | $19.42 | $971K | 964K |
| 2026-03-06 | Du Ying | Chairperson & CEO | Exercise or conversion | 50K | $1.74 | $87K | 1.0M |
| 2026-03-05 | Edmondson Frazor Titus III | Chief Legal Officer | Sell | 16K | $19.06 | $297K | 4K |
| 2026-03-05 | Du Ying | Chairperson & CEO | Sell | 50K | $19.22 | $961K | 964K |
| 2026-03-05 | Du Ying | Chairperson & CEO | Exercise or conversion | 50K | $1.74 | $87K | 1.0M |
| 2026-03-04 | Du Ying | Chairperson & CEO | Sell | 36K | $19.32 | $690K | 964K |
| 2026-03-04 | Du Ying | Chairperson & CEO | Sell | 14K | $18.78 | $268K | 1000K |
| 2026-03-04 | Du Ying | Chairperson & CEO | Exercise or conversion | 50K | $1.74 | $87K | 1.0M |
| 2026-03-03 | Amado Rafael | See Remarks | Sell | 10K | $17.38 | $174K | 42K |
| 2025-12-31 | Amado Rafael | See Remarks | Sell | 11K | $17.43 | $188K | 52K |
| 2025-12-30 | Amado Rafael | See Remarks | Exercise or conversion | 21K | price not stated in the filing | not stated | 63K |
| 2025-12-16 | Edmondson Frazor Titus III | Chief Legal Officer | Sell | 9K | $17.14 | $148K | 19K |
| 2025-12-11 | Du Ying | Chairperson & CEO | Gift | 378K | $0.00 | $0 | 964K |
| 2025-12-10 | Du Ying | Chairperson & CEO | Gift | 303K | $0.00 | $0 | 587K |
| 2025-11-21 | Edmondson Frazor Titus III | Chief Legal Officer | Sell | 14K | $19.78 | $283K | 28K |
| 2025-11-03 | Chen Yajing | Chief Financial Officer | Sell | 240 | $26.83 | $6K | 17K |
| 2025-10-31 | Chen Yajing | Chief Financial Officer | Exercise or conversion | 500 | price not stated in the filing | not stated | 18K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON40 Form 144 notices on file for ZLAB worth $13.6M at the prices reported; 4 in the last 90 days worth $2.8M. Latest: Smiley Joshua L filed on 2026-08-20 to sell 98,653 shares ($2.6M) from 2026-08-20.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-08-20 | Smiley Joshua LFormer Officer | 99K | $2.6M | 0.023% | 2026-08-20 | Fidelity Brokerage Services LLC |
| 2026-08-19 | Chen YajingOfficer | 260 | $7K | 0.000% | 2026-08-19 | Fidelity Brokerage Services LLC |
| 2026-08-12 | Lis WilliamDirector | 9K | $213K | 0.002% | 2026-08-12 | Fidelity Brokerage Services LLC |
| 2026-08-11 | Chen YajingOfficer | 619 | $15K | 0.000% | 2026-08-11 | Fidelity Brokerage Services LLC |
| 2026-06-30 | Du YingOfficer, Director | 7K | $130K | 0.002% | 2026-06-30 | Fidelity Brokerage Services LLC |
| 2026-06-26 | Edmondson Frazor Titus IIIOfficer | 4K | $72K | 0.001% | 2026-06-26 | Fidelity Brokerage Services LLC |
| 2026-06-26 | Du YingOfficer, Director | 25K | $429K | 0.007% | 2026-06-26 | Fidelity Brokerage Services LLC |
| 2026-06-26 | Chen YajingOfficer | 2K | $40K | 0.001% | 2026-06-26 | Fidelity Brokerage Services LLC |
| 2026-06-22 | Lis WilliamDirector | 7K | $127K | 0.002% | 2026-06-22 | Fidelity Brokerage Services LLC |
| 2026-05-18 | Du YingOfficer, Director | 50K | $976K | 0.015% | 2026-05-18 | Fidelity Brokerage Services LLC |
| 2026-05-15 | Du YingOfficer, Director | 50K | $1.0M | 0.015% | 2026-05-15 | Fidelity Brokerage Services LLC |
| 2026-05-14 | Edmondson Frazor Titus IIIOfficer | 4K | $71K | 0.001% | 2026-05-14 | Fidelity Brokerage Services LLC |
| 2026-05-14 | Du YingOfficer, Director | 50K | $1.0M | 0.015% | 2026-05-14 | Fidelity Brokerage Services LLC |
| 2026-05-13 | Du YingOfficer, Director | 50K | $960K | 0.015% | 2026-05-13 | Fidelity Brokerage Services LLC |
| 2026-04-06 | Smiley Joshua LOfficer | 3K | $62K | 0.001% | 2026-04-06 | Fidelity Brokerage Services LLC |
| 2026-04-06 | Edmondson Frazor Titus IIIOfficer | 1K | $25K | 0.000% | 2026-04-06 | Fidelity Brokerage Services LLC |
| 2026-04-06 | Du YingOfficer, Director | 3K | $54K | 0.001% | 2026-04-06 | Fidelity Brokerage Services LLC |
| 2026-04-06 | Chen YajingOfficer | 853 | $17K | 0.000% | 2026-04-06 | Fidelity Brokerage Services LLC |
| 2026-04-06 | Amado RafaelOfficer | 3K | $56K | 0.001% | 2026-04-06 | Fidelity Brokerage Services LLC |
| 2026-04-02 | Smiley Joshua LOfficer | 10K | $196K | 0.003% | 2026-04-02 | Fidelity Brokerage Services LLC |
| 2026-04-02 | Edmondson Frazor Titus IIIOfficer | 4K | $86K | 0.001% | 2026-04-02 | Fidelity Brokerage Services LLC |
| 2026-04-02 | Du YingOfficer, Director | 6K | $114K | 0.002% | 2026-04-02 | Fidelity Brokerage Services LLC |
| 2026-04-02 | Chen YajingOfficer | 5K | $106K | 0.002% | 2026-04-02 | Fidelity Brokerage Services LLC |
| 2026-04-02 | Amado RafaelOfficer | 10K | $202K | 0.003% | 2026-04-02 | Fidelity Brokerage Services LLC |
| 2026-03-13 | Smiley Joshua LOfficer | 2K | $37K | 0.001% | 2026-03-13 | Fidelity Brokerage Services LLC |
| 2026-03-13 | Edmondson Frazor Titus IIIOfficer | 1K | $24K | 0.000% | 2026-03-13 | Fidelity Brokerage Services LLC |
| 2026-03-13 | Chen YajingOfficer | 2K | $32K | 0.001% | 2026-03-13 | Fidelity Brokerage Services LLC |
| 2026-03-13 | Amado RafaelOfficer | 3K | $55K | 0.001% | 2026-03-13 | Fidelity Brokerage Services LLC |
| 2026-03-11 | Du YingOfficer, Director | 1K | $20K | 0.000% | 2026-03-11 | Fidelity Brokerage Services LLC |
| 2026-03-09 | Du YingOfficer, Director | 50K | $961K | 0.016% | 2026-03-09 | Fidelity Brokerage Services LLC |
| 2026-03-06 | Du YingOfficer, Director | 50K | $959K | 0.016% | 2026-03-06 | Fidelity Brokerage Services LLC |
| 2026-03-05 | Edmondson Frazor Titus IIIOfficer | 16K | $297K | 0.005% | 2026-03-05 | Fidelity Brokerage Services LLC |
| 2026-03-05 | Du YingOfficer, Director | 50K | $953K | 0.016% | 2026-03-05 | Fidelity Brokerage Services LLC |
| 2026-03-04 | Du YingOfficer, Director | 50K | $914K | 0.016% | 2026-03-04 | Fidelity Brokerage Services LLC |
| 2026-03-03 | Amado RafaelOfficer | 10K | $174K | 0.003% | 2026-03-03 | Fidelity Brokerage Services LLC |
| 2025-12-31 | Amado RafaelOfficer | 11K | $188K | 0.003% | 2025-12-31 | Fidelity Brokerage Services LLC |
| 2025-12-16 | Edmondson Frazor Titus IIIOfficer | 9K | $148K | 0.002% | 2025-12-16 | Fidelity Brokerage Services LLC |
| 2025-11-21 | Edmondson Frazor Titus IIIOfficer | 14K | $283K | 0.004% | 2025-11-21 | Fidelity Brokerage Services LLC |
| 2025-11-03 | Chen YajingOfficer | 240 | $6K | 0.000% | 2025-11-03 | Fidelity Brokerage Services LLC |
| 2025-10-02 | Chen YajingOfficer | 456 | $16K | 0.000% | 2025-10-02 | Fidelity Brokerage Services LLC |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON8 holders report 5% or more of ZLAB in their latest filing, all on Schedule 13G (passive). The largest reported stake is RTW Investments, LP at 6.3% of the class (69,590,320 shares), filed 2026-02-17 for an event on 2025-12-31.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-06-11 | 13G | Chen Yuindividual | 59.1M | 5.3% | 2026-06-02 |
| 2026-06-11 | 13G | TCG Crossover Fund II, L.P.partnership | 29.6M | 2.6% | 2026-06-02 |
| 2026-06-11 | 13G | TCG Crossover GP II, LLCother entity | 29.6M | 2.6% | 2026-06-02 |
| 2026-06-11 | 13G | TCG Crossover GP III, LLCother entity | 29.6M | 2.6% | 2026-06-02 |
| 2026-06-11 | 13G | TCG Crossover Fund III, L.P.partnership | 29.6M | 2.6% | 2026-06-02 |
| 2026-04-06 | 13G | Peter Kolchinskyparent holding company, individual | 57.4M | 5.2% | 2026-03-30 |
| 2026-04-06 | 13G | RA Capital Management, L.P.investment adviser, partnership | 57.4M | 5.2% | 2026-03-30 |
| 2026-04-06 | 13G | Rajeev Shahparent holding company, individual | 57.4M | 5.2% | 2026-03-30 |
| 2026-04-06 | 13G | RA Capital Healthcare Fund, L.P.partnership | 57.4M | 5.2% | 2026-03-30 |
| 2026-02-17 | 13G | RTW Investments, LPinvestment adviser, partnership | 69.6M | 6.3% | 2025-12-31 |
| 2026-02-17 | 13G | Roderick Wongparent holding company, individual | 69.6M | 6.3% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 6 | QM11 Limitedcorporation | 48.9M | 4.4% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 6 | Qiming Corporate GP IV, Ltd.corporation | 48.9M | 4.4% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 6 | Qiming Venture Partners IV, L.P.partnership | 47.4M | 4.2% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 6 | Qiming GP IV, L.P.partnership | 47.4M | 4.2% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 6 | Qiming Managing Directors Fund IV, L.P.partnership | 1.5M | 0.1% | 2025-12-31 |
| 2026-02-13 | 13G/Ano. 1 | Capital World Investorsinvestment adviser | 1.7M | 0.2% | 2025-12-31 |
| 2026-02-10 | 13G/Ano. 1 | Wellington Investment Advisors Holdings LLPparent holding company | 48.1M | 4.3% | 2025-12-31 |
| 2026-02-10 | 13G/Ano. 1 | Wellington Group Holdings LLPparent holding company | 48.1M | 4.3% | 2025-12-31 |
| 2026-02-10 | 13G/Ano. 1 | Wellington Management Group LLPparent holding company | 48.1M | 4.3% | 2025-12-31 |
| 2026-02-05 | 13G/Ano. 3 | FMR LLCparent holding company | 43.5M | 3.9% | 2025-12-31 |
| 2026-02-05 | 13G/Ano. 3 | Abigail P. Johnsonindividual | 43.5M | 3.9% | 2025-12-31 |
| 2025-11-12 | 13G | Wellington Management Company LLPinvestment adviser | 67.4M | 5.4% | 2025-09-30 |
13F holders
Tracked managers holding ZLAB at their latest 13F. JSON3 of the 30 tracked managers held ZLAB at their latest 13F, $51.8M in total at quarter-end prices. Two Sigma Investments is the largest at $24.7M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 1 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Two Sigma Investments | 2026-06-30 | 1.3M | $24.7M | 0.02% | +990K |
| Citadel Advisors | 2026-06-30 | 1.3M | $24.4M | 0.00% | -404K |
| D. E. Shaw & Co. | 2026-06-30 | 141K | $2.7M | 0.00% | +78K |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
Financials
SEC XBRL, as filed. JSONIn Q2 FY 2026 (quarter ended 2026-06-30) Zai Lab reported revenue of $105.8M, down 3.1% from the same quarter a year earlier, and net loss of $50.8M (-0.05 diluted EPS). In FY 2025 it generated -$150.8M of operating cash flow.
- Cash
- $607.5M
- Equity
- $607.0M
- Total assets
- $1.07B
- Shares outstanding
- 88,592,343
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q2 FY 2026 | 2026-06-30 | $105.8M | -$50.8M | -48.1% | -0.05 |
| Q1 FY 2026 | 2026-03-31 | $95.6M | -$51.0M | -53.4% | -0.05 |
| Q4 FY 2025derived | 2025-12-31 | $127.1M | -$50.4M | -39.7% | n/a |
| Q3 FY 2025 | 2025-09-30 | $115.4M | -$36.0M | -31.2% | -0.03 |
| Q2 FY 2025 | 2025-06-30 | $109.1M | -$40.7M | -37.3% | -0.04 |
| Q1 FY 2025 | 2025-03-31 | $105.7M | -$48.4M | -45.8% | -0.04 |
| Q4 FY 2024derived | 2024-12-31 | $108.5M | -$81.7M | -75.3% | n/a |
| Q3 FY 2024 | 2024-09-30 | $101.8M | -$41.7M | -40.9% | -0.04 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $457.2M | -$175.5M | -$150.8M | $8.1M | n/a | n/a |
| FY 2024 | 2024-12-31 | $397.6M | -$257.1M | -$214.9M | $5.7M | n/a | n/a |
| FY 2023 | 2023-12-31 | $266.7M | -$334.6M | -$198.2M | $7.2M | n/a | n/a |
| FY 2022 | 2022-12-31 | $212.7M | -$443.3M | -$367.6M | $24.6M | n/a | n/a |
| FY 2021 | 2021-12-31 | $144.1M | -$704.5M | -$549.2M | $18.3M | n/a | n/a |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2021-02-26 from the cover page.
What this page is
Zai Lab in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Zai Lab (ZLAB), SEC CIK 1704292, listed on Nasdaq, classified by the SEC as pharmaceutical preparations. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-10-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-03.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-13.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-08-20.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-06-11.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Financials
- SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-06.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-10-01.JSON and CSV
- Company record
- EDGAR filing index for CIK 1704292Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
Other companies the SEC classifies as pharmaceutical preparations
Other company pages
Datasets
Frequently Asked Questions
How much of ZLAB is sold short?
8,843,854 shares were held short at the 2026-10-15 settlement, 11.3 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is ZLAB's daily short volume?
On 2026-11-03, 104,884 of the 272,388 ZLAB shares reported to FINRA were sold short, 38.5% of the day's reported volume. Short volume is a flow for one day, not a position.
Does ZLAB have fails to deliver?
The SEC's latest file shows 18,422 ZLAB shares failed to deliver at settlement 2026-10-13. Fails are reported per settlement date and published twice a month with a lag.
Are ZLAB insiders buying or selling?
Insiders at ZLAB reported 3 open-market sells worth $235K in the last 90 days and no open-market buys. Latest filing: Chen Yajing (Chief Financial Officer) on 2026-10-01.
Have ZLAB insiders filed to sell?
40 Form 144 notices on file for ZLAB worth $13.6M at the prices reported; 4 in the last 90 days worth $2.8M. Latest: Smiley Joshua L filed on 2026-08-20 to sell 98,653 shares ($2.6M) from 2026-08-20.
Who owns 5% or more of ZLAB?
8 holders report 5% or more of ZLAB in their latest filing, all on Schedule 13G (passive). The largest reported stake is RTW Investments, LP at 6.3% of the class (69,590,320 shares), filed 2026-02-17 for an event on 2025-12-31.
What did ZLAB report last quarter?
In Q2 FY 2026 (quarter ended 2026-06-30) Zai Lab reported revenue of $105.8M, down 3.1% from the same quarter a year earlier, and net loss of $50.8M (-0.05 diluted EPS). In FY 2025 it generated -$150.8M of operating cash flow.
Which tracked 13F managers own ZLAB?
3 of the 30 tracked 13F managers held ZLAB shares at their latest filing, $51.8M in all. The largest: Two Sigma Investments (1.3M shares, $24.7M), Ken Griffin's Citadel Advisors (1.3M shares, $24.4M), D. E. Shaw & Co. (141K shares, $2.7M).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.