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Zymeworks Inc.

ZYME
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001937653

In the last 90 days, Zymeworks Inc. insiders filed 0 open-market purchases and 1 sale; 203 institutions reported holding it in 13F filings for Q2 2026, worth $1.79B in total; no superinvestor holds it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
5.91M
Shares, settlement Oct 30, 2026
Change
+337.1K
+6.0% vs. Oct 15, 2026
Days to cover
4.25
Short interest ÷ average daily volume
Average daily volume
1.39M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 4,700,126 sharesNov 15, 2024: 4,208,640 sharesNov 29, 2024: 4,632,532 sharesDec 13, 2024: 4,338,660 sharesDec 31, 2024: 4,148,390 sharesJan 15, 2025: 4,556,864 sharesJan 31, 2025: 4,380,063 sharesFeb 14, 2025: 3,837,127 sharesFeb 28, 2025: 3,963,020 sharesMar 14, 2025: 5,415,327 sharesMar 31, 2025: 5,406,929 sharesApr 15, 2025: 6,496,685 sharesApr 30, 2025: 6,615,244 sharesMay 15, 2025: 6,791,821 sharesMay 30, 2025: 7,193,207 sharesJun 13, 2025: 6,883,488 sharesJun 30, 2025: 6,925,863 sharesJul 15, 2025: 6,868,563 sharesJul 31, 2025: 6,806,921 sharesAug 15, 2025: 6,807,564 sharesAug 29, 2025: 6,885,888 sharesSep 15, 2025: 7,156,267 sharesSep 30, 2025: 6,918,885 sharesOct 15, 2025: 7,047,624 sharesOct 31, 2025: 7,531,090 sharesNov 14, 2025: 8,541,535 sharesNov 28, 2025: 5,609,170 sharesDec 15, 2025: 3,938,970 sharesDec 31, 2025: 3,603,765 sharesJan 15, 2026: 3,823,322 sharesJan 30, 2026: 3,777,909 sharesFeb 13, 2026: 3,973,308 sharesFeb 27, 2026: 4,135,418 sharesMar 13, 2026: 4,078,338 sharesMar 31, 2026: 4,461,520 sharesApr 15, 2026: 4,652,176 sharesApr 30, 2026: 4,648,225 sharesMay 15, 2026: 4,470,973 sharesMay 29, 2026: 4,527,668 sharesJun 15, 2026: 4,485,642 sharesJun 30, 2026: 4,364,318 sharesJul 15, 2026: 4,102,257 sharesJul 31, 2026: 4,106,590 sharesAug 14, 2026: 4,538,353 sharesAug 31, 2026: 4,724,831 sharesSep 15, 2026: 4,939,072 sharesSep 30, 2026: 5,291,136 sharesOct 15, 2026: 5,577,540 sharesOct 30, 2026: 5,914,601 shares
Short interest in ZYME by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20265.91M+337.1K+6.0%1.39M4.25
Oct 15, 20265.58M+286.4K+5.4%1.28M4.36
Sep 30, 20265.29M+352.1K+7.1%953.9K5.55
Sep 15, 20264.94M+214.2K+4.5%619.9K7.97
Aug 31, 20264.72M+186.5K+4.1%827.6K5.71
Aug 14, 20264.54M+431.8K+10.5%533.9K8.50
Jul 31, 20264.11M+4.33K+0.1%376.8K10.90
Jul 15, 20264.10M−262.1K−6.0%542.3K7.56
Jun 30, 20264.36M−121.3K−2.7%704.8K6.19
Jun 15, 20264.49M−42.0K−0.9%804.7K5.57
May 29, 20264.53M+56.7K+1.3%594.7K7.61
May 15, 20264.47M−177.3K−3.8%673.3K6.64
Apr 30, 20264.65M−3.95K−0.1%553.5K8.40
Apr 15, 20264.65M+190.7K+4.3%664.9K7.00
Mar 31, 20264.46M+383.2K+9.4%553.6K8.06
Mar 13, 20264.08M−57.1K−1.4%969.2K4.21
Feb 27, 20264.14M+162.1K+4.1%458.0K9.03
Feb 13, 20263.97M+195.4K+5.2%550.2K7.22
Jan 30, 20263.78M−45.4K−1.2%642.3K5.88
Jan 15, 20263.82M+219.6K+6.1%1.28M2.98
Dec 31, 20253.60M−335.2K−8.5%559.4K6.44
Dec 15, 20253.94M−1.67M−29.8%693.9K5.68
Nov 28, 20255.61M−2.93M−34.3%2.88M1.95
Nov 14, 20258.54M+1.01M+13.4%1.07M7.96
Oct 31, 20257.53M+483.5K+6.9%996.5K7.56
Oct 15, 20257.05M+128.7K+1.9%713.2K9.88
Sep 30, 20256.92M−237.4K−3.3%636.0K10.88
Sep 15, 20257.16M+270.4K+3.9%525.5K13.62
Aug 29, 20256.89M+78.3K+1.2%390.5K17.64
Aug 15, 20256.81M+6430.0%520.3K13.08
Jul 31, 20256.81M−61.6K−0.9%409.1K16.64
Jul 15, 20256.87M−57.3K−0.8%378.5K18.15
Jun 30, 20256.93M+42.4K+0.6%600.8K11.53
Jun 13, 20256.88M−309.7K−4.3%423.3K16.26
May 30, 20257.19M+401.4K+5.9%415.6K17.31
May 15, 20256.79M+176.6K+2.7%469.2K14.48
Apr 30, 20256.62M+118.6K+1.8%516.4K12.81
Apr 15, 20256.50M+1.09M+20.2%1.06M6.15
Mar 31, 20255.41M−8.40K−0.2%581.8K9.29
Mar 14, 20255.42M+1.45M+36.7%914.8K5.92
Feb 28, 20253.96M+125.9K+3.3%414.9K9.55
Feb 14, 20253.84M−542.9K−12.4%372.5K10.30
Jan 31, 20254.38M−176.8K−3.9%308.0K14.22
Jan 15, 20254.56M+408.5K+9.9%554.9K8.21
Dec 31, 20244.15M−190.3K−4.4%582.0K7.13
Dec 13, 20244.34M−293.9K−6.3%418.1K10.38
Nov 29, 20244.63M+423.9K+10.1%400.2K11.58
Nov 15, 20244.21M−491.5K−10.5%679.4K6.19
Oct 31, 20244.70M+536.5K+12.9%403.4K11.65

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in ZYME by settlement date
Settlement dateSharesPriceValue
Oct 6, 20261,120$26.21$29.4K
Sep 21, 202617,984$26.57$477.8K
Sep 18, 20261,155$27.48$31.7K
Aug 27, 202656$29.31$1.64K
Aug 25, 202643$28.77$1.24K
Aug 24, 202679$28.67$2.26K
Aug 19, 20266$26.07$156.42
Aug 14, 2026282$25.76$7.26K
Aug 12, 20262$24.32$48.64
Aug 11, 2026905$24.16$21.9K
Aug 6, 2026597$23.50$14.0K
Aug 5, 202617$22.79$387.43
Aug 3, 202630$21.94$658.2
Jul 23, 20263,354$23.36$78.3K
Jul 22, 20264,899$24.05$117.8K
Jul 20, 20266,803$24.19$164.6K
Jul 17, 202671$24.19$1.72K
Jul 16, 202673$24.66$1.80K
Jul 9, 20261,965$26.65$52.4K
Jun 18, 202672$23.14$1.67K
Jun 12, 202612,377$22.97$284.3K
Jun 11, 20261,005$22.85$23.0K
Jun 5, 20265,430$25.10$136.3K
Jun 4, 202671$24.35$1.73K
Jun 3, 20263,678$24.11$88.7K
May 26, 202688$25.61$2.25K
May 20, 2026117$24.40$2.85K
May 19, 20264,700$24.43$114.8K
May 14, 2026309$24.57$7.59K
May 1, 202647$27.54$1.29K

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in ZYME by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 13, 2026217,85957283,30876.9%
Nov 12, 2026355,550500552,17964.4%
Nov 11, 2026211,3080328,41164.3%
Nov 10, 2026349,8800461,71575.8%
Nov 9, 2026255,0100340,12275.0%
Nov 6, 2026129,6070266,30148.7%
Nov 5, 2026171,8460400,99442.9%
Nov 4, 2026116,9870258,52645.3%
Nov 3, 2026157,932174387,63740.7%
Nov 2, 2026224,5690298,46075.2%
Oct 30, 202661,8930114,17554.2%
Oct 29, 202683,222100219,32237.9%
Oct 28, 202683,9890239,20735.1%
Oct 27, 2026135,1110233,14658.0%
Oct 26, 2026110,7570231,69147.8%
Oct 23, 2026195,0730321,91160.6%
Oct 22, 2026114,1550203,18556.2%
Oct 21, 2026244,8750364,57767.2%
Oct 20, 2026543,0960790,88868.7%
Oct 19, 202695,05491138,77568.5%
Oct 16, 202693,4110146,52363.8%
Oct 15, 202683,1520148,70255.9%
Oct 14, 202684,5270122,20569.2%
Oct 13, 202644,025079,51955.4%
Oct 12, 202659,8620103,83557.7%
Oct 9, 2026105,8820157,51367.2%
Oct 8, 2026148,9150239,26062.2%
Oct 7, 2026162,0250228,08271.0%
Oct 6, 202688,0260211,12741.7%
Oct 5, 2026103,3450158,14565.3%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in ZYME
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2783,69818,0573,150,9293,40419.9%
Sep 28, 2026T2784,73819,1622,802,7683,30521.9%
Sep 21, 2026T2957,51722,323887,2523,42651.9%
Sep 14, 2026T2674,86521,9961,655,0283,07829.0%
Sep 7, 2026T2427,53713,737663,2982,76239.2%
Aug 31, 2026T2694,09021,759726,6014,72748.9%
Aug 24, 2026T21,362,64030,554891,4087,16760.5%
Aug 17, 2026T2748,71219,457530,7864,28758.5%
Aug 10, 2026T2922,45726,995227,9213,28980.2%
Aug 3, 2026T2643,64720,774370,2172,75263.5%
Jul 27, 2026T2472,25319,943178,9162,96472.5%
Jul 20, 2026T2391,77618,506353,7302,09252.6%