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Zymeworks Inc. short interest

5.6M shares of Zymeworks were sold short at the 15 October 2026 settlement, the most since 28 Nov 2025. Short sellers would need 4.4 days of normal trading to buy them back.

Shares sold short5.6Mat 15 Oct 2026
Change on the settlement before+5.4%-21% over a year
Days to cover4.36at 1.3M shares a day
Of shares in issue7.81%shares short over shares outstanding
New to this? How to read this page
  1. Short interest is the number of shares investors have borrowed and sold, betting the price will fall, and not yet bought back.
  2. Days to cover is shares short over an average day's trading: how many days it would take short sellers to buy them all back. Above 5 or so is high.
  3. Rising short interest says more investors are betting against the stock. A crowded short can also rise fast if shorts rush to buy back.
  4. Brokers report it twice a month to FINRA, about ten days after each settlement date.
  5. What is short interest?

Short interest, days to cover and the price

Short interest is the most since 28 Nov 2025, and the share price moved +55% over the last year.

Shares sold shortDays to coverShare price

Three charts on one timeline. Top: shares sold short at each settlement. Middle: days to cover, taller meaning shorts would need longer to buy back. Bottom: the share price, so you can see whether shorts added as the price fell or rose.

How it compares

every company on the site

    The bar ranks every company on the site from the lowest on the left to the highest on the right, in three equal thirds; the small figures under it are the values where each third starts, and the black tick is the middle company. The orange dot is this company; the grey ticks are the other companies in its industry (hover or tap for names). A hatched block is companies tied at none.

    Every settlement since 29 Dec 2017 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 20265.6M+5.4%1.3M4.36
    30 September 20265.3M+7.1%954K5.55
    15 September 20264.9M+4.5%620K7.97
    31 August 20264.7M+4.1%828K5.71
    14 August 20264.5M+10.5%534K8.50
    31 July 20264.1M+0.1%377K10.90
    15 July 20264.1M-6.0%542K7.56
    30 June 20264.4M-2.7%705K6.19
    15 June 20264.5M-0.9%805K5.57
    29 May 20264.5M+1.3%595K7.61
    15 May 20264.5M-3.8%673K6.64
    30 April 20264.6M-0.1%554K8.40
    15 April 20264.7M+4.3%665K7.00
    31 March 20264.5M+9.4%554K8.06
    13 March 20264.1M-1.4%969K4.21
    27 February 20264.1M+4.1%458K9.03
    13 February 20264.0M+5.2%550K7.22
    30 January 20263.8M-1.2%642K5.88
    15 January 20263.8M+6.1%1.3M2.98
    31 December 20253.6M-8.5%559K6.44
    15 December 20253.9M-29.8%694K5.68
    28 November 20255.6M-34.3%2.9M1.95
    14 November 20258.5M+13.4%1.1M7.96
    31 October 20257.5M+6.9%996K7.56
    15 October 20257.0M+1.9%713K9.88
    30 September 20256.9M-3.3%636K10.88
    15 September 20257.2M+3.9%525K13.62
    29 August 20256.9M+1.2%390K17.64
    15 August 20256.8M+0.0%520K13.08
    31 July 20256.8M-0.9%409K16.64
    15 July 20256.9M-0.8%379K18.15
    30 June 20256.9M+0.6%601K11.53
    13 June 20256.9M-4.3%423K16.26
    30 May 20257.2M+5.9%416K17.31
    15 May 20256.8M+2.7%469K14.48
    30 April 20256.6M+1.8%516K12.81
    15 April 20256.5M+20.2%1.1M6.15
    31 March 20255.4M-0.2%582K9.29
    14 March 20255.4M+36.6%915K5.92
    28 February 20254.0M+3.3%415K9.55
    14 February 20253.8M-12.4%373K10.30
    31 January 20254.4M-3.9%308K14.22
    15 January 20254.6M+9.8%555K8.21
    31 December 20244.1M-4.4%582K7.13
    13 December 20244.3M-6.3%418K10.38
    29 November 20244.6M+10.1%400K11.58
    15 November 20244.2M-10.5%679K6.19
    31 October 20244.7M+12.9%403K11.65
    15 October 20244.2M+2.8%462K9.01
    30 September 20244.0M+9.5%732K5.54
    13 September 20243.7M-12.1%760K4.87
    30 August 20244.2M+12.8%728K5.78
    15 August 20243.7M+8.0%883K4.22
    31 July 20243.5M-6.0%609K5.67
    15 July 20243.7M+12.3%653K5.63
    28 June 20243.3M+7.5%444K7.36
    14 June 20243.0M-18.7%825K3.69
    31 May 20243.7M-7.2%429K8.73
    15 May 20244.0M-19.6%844K4.78
    30 April 20245.0M-0.6%647K7.75
    15 April 20245.1M+0.4%534K9.45
    28 March 20245.0M+27.2%562K8.95
    15 March 20244.0M+19.5%742K5.34
    29 February 20243.3M+1.7%406K8.16
    15 February 20243.3M+11.6%588K5.54
    31 January 20242.9M+1.3%472K6.19
    12 January 20242.9M-2.8%623K4.62
    29 December 20233.0M-2.3%482K6.14
    15 December 20233.0M+8.4%437K6.93
    30 November 20232.8M+6.5%294K9.50
    15 November 20232.6M+8.7%455K5.77
    31 October 20232.4M-46.1%390K6.19
    13 October 20234.5M-4.2%377K11.89
    29 September 20234.7M-7.6%328K14.28
    15 September 20235.1M+1.9%355K14.25
    31 August 20235.0M-7.5%395K12.57
    15 August 20235.4M+6.0%727K7.39
    31 July 20235.1M-19.6%464K10.93
    14 July 20236.3M-6.5%498K12.66
    30 June 20236.7M+24.6%1.6M4.27
    15 June 20235.4M-2.9%311K17.40
    31 May 20235.6M-4.7%510K10.93
    15 May 20235.8M+0.4%487K11.99
    28 April 20235.8M-0.6%503K11.58
    14 April 20235.9M-6.6%673K8.70
    31 March 20236.3M-4.6%545K11.51
    15 March 20236.6M-7.0%714K9.21
    28 February 20237.1M-2.6%598K11.82
    15 February 20237.3M-1.2%496K14.63
    31 January 20237.3M+0.3%831K8.83
    13 January 20237.3M-14.9%1.0M7.16
    30 December 20228.6M+2.2%2.8M3.04
    15 December 20228.4M-9.3%1.1M7.58
    30 November 20229.3M-4.0%460K20.19
    15 November 20229.7M+0.3%976K9.91
    31 October 20229.7M-21.3%2.6M3.75
    14 October 202212.3M+76.3%726K16.88
    30 September 20227.0M-0.9%526K13.22
    15 September 20227.0M-4.7%636K11.03
    31 August 20227.4M-33.4%408K18.04
    15 August 202211.1M+0.6%938K11.79
    29 July 202211.0M-4.4%765K14.37
    15 July 202211.5M+10.6%823K13.98
    30 June 202210.4M+7.8%1.2M8.37
    15 June 20229.7M+14.4%1.1M9.18
    31 May 20228.4M+5.2%1.9M4.41
    13 May 20228.0M+10.8%2.4M3.30
    29 April 20227.2M-0.4%4.4M1.63
    14 April 20227.3M+1.4%1.3M5.45
    31 March 20227.2M+1.0%667K10.73
    15 March 20227.1M+0.5%720K9.84
    28 February 20227.1M+0.4%728K9.68
    15 February 20227.0M+21.5%948K7.41
    31 January 20225.8M-20.3%1.9M2.98
    14 January 20227.2M+10.1%1.1M6.53
    31 December 20216.6M+9.4%582K11.31
    15 December 20216.0M+48.0%949K6.34
    30 November 20214.1M+6.8%1.0M3.97
    15 November 20213.8M+8.4%383K9.95
    29 October 20213.5M-22.7%580K6.06
    15 October 20214.5M+24.2%698K6.52
    30 September 20213.7M+28.4%678K5.41
    15 September 20212.9M+37.5%503K5.68
    31 August 20212.1M+19.9%283K7.32
    13 August 20211.7M-6.3%359K4.83
    30 July 20211.8M+19.5%412K4.49
    15 July 20211.5M-0.7%538K2.88
    30 June 20211.6M+5.0%426K3.66
    15 June 20211.5M-9.9%399K3.72
    28 May 20211.6M+6.9%271K6.08
    14 May 20211.5M+4.1%409K3.77
    30 April 20211.5M-23.7%580K2.55
    15 April 20211.9M-0.9%282K6.88
    31 March 20212.0M-2.4%350K5.60
    15 March 20212.0M+10.8%419K4.79
    26 February 20211.8M+13.6%329K5.50
    12 February 20211.6M+112.1%550K2.89
    29 January 2021751K-14.8%838K1.00
    15 January 2021882K+28.1%496K1.78
    31 December 2020688K-21.3%230K3.00
    15 December 2020875K-26.0%392K2.23
    30 November 20201.2M-10.6%551K2.15
    13 November 20201.3M-10.7%261K5.07
    30 October 20201.5M-21.5%260K5.70
    15 October 20201.9M-4.5%262K7.21
    30 September 20202.0M-12.8%420K4.70
    15 September 20202.3M-2.9%715K3.17
    31 August 20202.3M-5.7%376K6.21
    14 August 20202.5M-4.6%248K10.00
    31 July 20202.6M+12.6%345K7.53
    15 July 20202.3M+2.8%552K4.18
    30 June 20202.2M+20.6%360K6.22
    15 June 20201.9M+58.2%441K4.21
    29 May 20201.2M+10.2%375K3.13
    15 May 20201.1M+39.7%516K2.07
    30 April 2020763K-6.8%351K2.17
    15 April 2020818K+24.8%283K2.89
    31 March 2020656K+11.0%491K1.34
    13 March 2020591K+27.1%457K1.29
    28 February 2020465K+5.5%331K1.41
    14 February 2020441K-17.2%197K2.23
    31 January 2020532K-36.9%672K1.00
    15 January 2020843K+59.2%462K1.82
    31 December 2019529K+9.1%363K1.46
    13 December 2019485K-7.4%324K1.50
    29 November 2019524K+13.3%467K1.12
    15 November 2019462K+0.8%305K1.52
    31 October 2019459K-21.5%299K1.53
    15 October 2019584K-30.1%262K2.23
    30 September 2019836K+11.7%250K3.35
    13 September 2019748K+10.2%404K1.85
    30 August 2019679K+0.0%259K2.63
    15 August 2019679K+13.9%147K4.63
    31 July 2019596K-4.9%201K2.97
    15 July 2019627K+217.6%399K1.57
    28 June 2019197K-59.1%639K1.00
    14 June 2019483K+25.4%143K3.39
    31 May 2019385K+68.5%130K2.96
    15 May 2019228K-34.5%174K1.31
    30 April 2019349K-42.1%257K1.36
    15 April 2019602K-4.0%91K6.61
    29 March 2019627K-2.6%100K6.29
    15 March 2019644K-9.8%137K4.70
    28 February 2019714K+2.2%74K9.60
    15 February 2019699K+5.6%48K14.62
    31 January 2019662K+5.9%208K3.18
    15 January 2019625K-4.3%148K4.22
    31 December 2018653K+11.9%197K3.31
    14 December 2018584K-4.6%137K4.27
    30 November 2018612K-4.1%134K4.58
    15 November 2018638K+0.1%141K4.52
    31 October 2018637K+10.1%69K9.26
    15 October 2018579K+2.5%101K5.71
    28 September 2018565K+10.8%133K4.25
    14 September 2018510K-6.6%126K4.06
    31 August 2018546K+0.3%63K8.60
    15 August 2018545K+33.6%114K4.77
    31 July 2018408K+51.9%105K3.87
    13 July 2018268K+2.9%84K3.19
    29 June 2018261K+11.4%150K1.74
    15 June 2018234K+104.9%436K1.00
    31 May 2018114K-2.6%279K1.00
    15 May 2018117K+243.9%57K2.07
    30 April 201834K-25.1%56K1.00
    13 April 201846K-7.4%25K1.79
    29 March 201849K-7.2%31K1.59
    15 March 201853K-2.5%13K4.21
    28 February 201854K-2.6%19K2.85
    15 February 201856K+21.9%32K1.75
    31 January 201846K+14.0%33K1.38
    12 January 201840K+1.9%15K2.73
    29 December 201739K11K3.49
    Shares in millions (M) or thousands (K); hold the pointer on a figure for the exact count. FINRA publishes consolidated short interest twice a month, about ten days after each settlement.