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Rapid Micro Biosystems, Inc. short interest

889K shares of Rapid Micro Biosystems were sold short at the 15 October 2026 settlement, near the top of its range over the last year (161K to 940K). Short sellers would need 3.8 days of normal trading to buy them back.

Shares sold short889Kat 15 Oct 2026
Change on the settlement before+4.1%+175% over a year
Days to cover3.83at 232K shares a day
Of shares in issue1.77%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 near the top of its range over the last year (161K to 940K), and the share price moved -77% 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 30 Jul 2021 as a table
    SettlementShares shortChangeAverage daily volumeDays to cover
    15 October 2026889K+4.1%232K3.83
    30 September 2026854K-9.2%375K2.28
    15 September 2026940K+8.2%252K3.73
    31 August 2026869K+3.0%194K4.48
    14 August 2026844K+2.2%282K2.99
    31 July 2026826K-2.0%163K5.05
    15 July 2026842K+14.1%264K3.19
    30 June 2026738K+20.3%200K3.70
    15 June 2026614K-18.0%126K4.86
    29 May 2026748K+13.4%192K3.91
    15 May 2026660K-18.4%128K5.16
    30 April 2026809K+48.7%193K4.18
    15 April 2026544K+44.1%185K2.94
    31 March 2026378K+18.9%277K1.36
    13 March 2026317K+46.4%235K1.35
    27 February 2026217K+22.1%101K2.16
    13 February 2026178K+6.9%226K1.00
    30 January 2026166K-7.0%426K1.00
    15 January 2026179K-0.2%354K1.00
    31 December 2025179K+10.9%146K1.22
    15 December 2025161K-32.4%106K1.52
    28 November 2025239K-20.8%102K2.35
    14 November 2025301K-3.0%161K1.87
    31 October 2025311K-3.7%82K3.78
    15 October 2025323K-14.7%93K3.47
    30 September 2025378K-1.6%60K6.31
    15 September 2025385K+12.9%84K4.57
    29 August 2025341K+0.7%60K5.70
    15 August 2025338K-1.9%125K2.71
    31 July 2025345K-15.8%111K3.09
    15 July 2025409K-20.6%68K6.01
    30 June 2025516K-25.1%87K5.95
    13 June 2025688K-6.7%85K8.07
    30 May 2025738K-25.1%97K7.59
    15 May 2025985K-29.9%212K4.65
    30 April 20251.4M-2.6%98K14.29
    15 April 20251.4M-10.1%170K8.49
    31 March 20251.6M+35.6%191K8.42
    14 March 20251.2M+191.4%523K2.26
    28 February 2025406K+202.3%1.5M1.00
    14 February 2025134K+1.6%689K1.00
    31 January 2025132K+16.5%292K1.00
    15 January 2025114K+160.6%171K1.00
    31 December 202444K-25.1%73K1.00
    13 December 202458K+86.9%38K1.53
    29 November 202431K-29.3%65K1.00
    15 November 202444K-37.5%87K1.00
    31 October 202470K+299.7%134K1.00
    15 October 202418K-55.9%17K1.01
    30 September 202440K-43.2%68K1.00
    13 September 202470K+55.0%35K2.02
    30 August 202445K-43.1%66K1.00
    15 August 202480K+591.4%130K1.00
    31 July 202412K-45.2%25K1.00
    15 July 202421K-40.8%23K1.00
    28 June 202435K+31.9%38K1.00
    14 June 202427K+38.1%19K1.44
    31 May 202419K-49.7%19K1.04
    15 May 202439K-27.1%74K1.00
    30 April 202453K-12.6%28K1.88
    15 April 202461K+5.1%36K1.67
    28 March 202458K-27.9%38K1.52
    15 March 202480K-10.9%53K1.51
    29 February 202490K-13.1%42K2.14
    15 February 2024104K-21.4%44K2.34
    31 January 2024132K-21.7%99K1.33
    12 January 2024168K+341.9%1.0M1.00
    29 December 202338K+152.0%230K1.00
    15 December 202315K+66.0%16K1.00
    30 November 20239K+34.5%14K1.00
    15 November 20237K-16.2%15K1.00
    31 October 20238K-35.0%19K1.00
    13 October 202312K-35.4%32K1.00
    29 September 202319K-26.1%20K1.00
    15 September 202326K+6.1%47K1.00
    31 August 202325K-4.4%17K1.48
    15 August 202326K-12.9%35K1.00
    31 July 202329K+16.8%36K1.00
    14 July 202325K+9.1%37K1.00
    30 June 202323K-40.2%44K1.00
    15 June 202339K+12.6%38K1.01
    31 May 202334K-4.8%65K1.00
    15 May 202336K-1.1%74K1.00
    28 April 202337K-15.0%26K1.39
    14 April 202343K-26.8%109K1.00
    31 March 202359K-18.4%35K1.65
    15 March 202372K+241.3%70K1.03
    28 February 202321K+8.1%56K1.00
    15 February 202319K-14.3%33K1.00
    31 January 202323K-15.4%31K1.00
    13 January 202327K-71.1%287K1.00
    30 December 202293K+3.9%127K1.00
    15 December 202290K-51.8%187K1.00
    30 November 2022186K-14.7%24K7.80
    15 November 2022218K-4.2%25K8.61
    31 October 2022227K-12.3%23K9.97
    14 October 2022259K-16.5%21K12.13
    30 September 2022310K+6.6%29K10.70
    15 September 2022291K+6.7%21K13.80
    31 August 2022273K+10.2%55K4.92
    15 August 2022248K-29.0%49K5.08
    29 July 2022349K-24.1%74K4.71
    15 July 2022459K+26.3%233K1.97
    30 June 2022364K-54.1%1.1M1.00
    15 June 2022793K-2.4%145K5.46
    31 May 2022813K-0.1%278K2.92
    13 May 2022813K-5.7%153K5.31
    29 April 2022862K+7.5%143K6.02
    14 April 2022802K-11.2%104K7.69
    31 March 2022903K+83.3%361K2.50
    15 March 2022493K-1.4%216K2.29
    28 February 2022500K-13.0%121K4.14
    15 February 2022574K+18.7%140K4.09
    31 January 2022484K+4.0%181K2.67
    14 January 2022465K-2.0%225K2.07
    31 December 2021475K+52.2%198K2.40
    15 December 2021312K-6.3%172K1.81
    30 November 2021333K+1.9%103K3.23
    15 November 2021327K-17.1%59K5.51
    29 October 2021394K-4.3%83K4.77
    15 October 2021412K-11.2%109K3.79
    30 September 2021464K+853.0%285K1.63
    15 September 202149K+141.4%147K1.00
    31 August 202120K+16.8%149K1.00
    13 August 202117K-73.1%181K1.00
    30 July 202164K255K1.00
    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.