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Zenas BioPharma, Inc. short interest

12.5M shares of Zenas BioPharma were sold short at the 15 October 2026 settlement, the most at any settlement since 29 Dec 2017, when our record starts. Short sellers would need 18.8 days of normal trading to buy them back.

Shares sold short12.5Mat 15 Oct 2026
Change on the settlement before+5.0%+189% over a year
Days to cover18.83at 666K shares a day
Of shares in issue19.80%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 at any settlement since 29 Dec 2017, when our record starts, and the share price moved +1% 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 202612.5M+5.0%666K18.83
    30 September 202611.9M+0.6%772K15.48
    15 September 202611.9M+1.4%529K22.43
    31 August 202611.7M+0.4%825K14.18
    14 August 202611.7M-0.8%554K21.06
    31 July 202611.8M-3.4%850K13.83
    15 July 202612.2M-0.2%977K12.46
    30 June 202612.2M+9.6%1.3M9.64
    15 June 202611.1M+2.3%576K19.33
    29 May 202610.9M+1.8%600K18.13
    15 May 202610.7M-1.5%501K21.31
    30 April 202610.9M+6.2%453K23.97
    15 April 202610.2M+9.2%826K12.37
    31 March 20269.4M+21.4%1.3M7.48
    13 March 20267.7M-3.9%347K22.25
    27 February 20268.0M+2.9%750K10.70
    13 February 20267.8M+18.8%927K8.41
    30 January 20266.6M+7.9%580K11.32
    15 January 20266.1M+27.4%2.0M3.01
    31 December 20254.8M-3.5%402K11.90
    15 December 20255.0M+1.9%286K17.31
    28 November 20254.9M+5.5%338K14.36
    14 November 20254.6M-3.3%373K12.34
    31 October 20254.8M+9.9%702K6.79
    15 October 20254.3M-22.8%440K9.85
    30 September 20255.6M+1.2%280K20.09
    15 September 20255.6M-3.6%310K17.89
    29 August 20255.8M+9.4%209K27.55
    15 August 20255.3M+0.8%118K44.74
    31 July 20255.2M+3.0%126K41.48
    15 July 20255.1M-0.5%203K25.03
    30 June 20255.1M+3.9%183K27.93
    13 June 20254.9M+1.1%265K18.56
    30 May 20254.9M-1.2%116K41.72
    15 May 20254.9M+1.0%146K33.77
    30 April 20254.9M+10.9%139K35.10
    15 April 20254.4M+14.7%281K15.63
    31 March 20253.8M+2.5%224K17.06
    14 March 20253.7M+9.4%149K25.04
    28 February 20253.4M-1.6%123K27.79
    14 February 20253.5M+5.1%165K21.07
    31 January 20253.3M-1.2%233K14.13
    15 January 20253.3M+3.8%189K17.65
    31 December 20243.2M+51.0%624K5.15
    13 December 20242.1M+44.9%362K5.88
    29 November 20241.5M+83.9%406K3.62
    15 November 2024799K+25.7%87K9.19
    31 October 2024636K+55.5%160K3.97
    15 October 2024409K+77.4%154K2.66
    30 September 2024231K+358.7%134K1.72
    13 March 202050K-5.3%38K1.31
    28 February 202053K+12.9%41K1.31
    14 February 202047K-3.7%21K2.21
    31 January 202049K+10.9%18K2.71
    15 January 202044K-35.7%24K1.84
    31 December 201969K+29.8%15K4.65
    13 December 201953K+9.9%39K1.35
    29 November 201948K+52.7%19K2.53
    15 November 201931K+53.5%7K4.75
    31 October 201920K+15.5%6K3.39
    15 October 201918K-21.2%9K2.02
    30 September 201923K-1.9%7K3.27
    13 September 201923K+6.8%5K4.47
    30 August 201922K-0.5%8K2.71
    15 August 201922K+3.1%10K2.20
    31 July 201921K-18.4%3K7.76
    15 July 201926K-16.3%8K3.21
    28 June 201931K+15.8%11K2.68
    14 June 201926K+20.6%7K3.78
    31 May 201922K-15.0%11K2.00
    15 May 201926K-8.4%8K3.34
    30 April 201928K+59.6%37K1.00
    15 April 201918K+1.7%24K1.00
    29 March 201917K-5.2%20K1.00
    15 March 201918K+6.0%26K1.00
    28 February 201917K-8.7%11K1.51
    15 February 201919K+11.0%13K1.47
    31 January 201917K-42.8%26K1.00
    15 January 201930K+54.8%31K1.00
    31 December 201819K-33.6%35K1.00
    14 December 201829K-32.3%14K2.10
    30 November 201843K+6.8%9K4.69
    15 November 201840K+12.0%14K2.84
    31 October 201836K+55.3%16K2.31
    15 October 201823K-4.5%17K1.38
    28 September 201824K-4.8%12K2.09
    14 September 201825K-16.1%14K1.77
    31 August 201830K+17.2%8K3.79
    15 August 201826K+3.0%15K1.68
    31 July 201825K-7.2%20K1.24
    13 July 201827K+55.5%8K3.36
    29 June 201817K+16.2%6K2.93
    15 June 201815K-4.5%2K7.85
    31 May 201816K-50.4%7K2.11
    15 May 201832K-7.8%12K2.53
    30 April 201834K+21.1%8K4.40
    13 April 201828K+8.3%41K1.00
    29 March 201826K+5.0%31K1.00
    15 March 201825K-17.9%26K1.00
    28 February 201830K+5.8%25K1.23
    15 February 201829K-8.9%54K1.00
    31 January 201831K-41.0%78K1.00
    12 January 201853K+57.0%61K1.00
    29 December 201734K21K1.64
    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.