ShortInterestHistory.com

UPB Short Interest History

UPB Short Interest (July 31, 2026 Update)
Short interest for UPB was 3.6M as of July 31, 2026, +0.8% from the prior report.
This page tracks UPB short interest over time, including historical values, changes between reports, and days to cover.

Upstream Bio, Inc. Common Stoc | UPB | Nasdaq | Latest report: July 31, 2026

Current Short Interest3.6M
Prior Short Interest3.6M
Change Shares30.4K
Change %+0.8%
Average Daily Volume487.0K
Days to Cover7.49

At the latest settlement date of July 31, 2026, Upstream Bio, Inc. Common Stoc (UPB) showed reported short interest of 3,648,558 shares. That compared with 3,618,151 shares in the prior report, a change of 30.4K shares, or +0.8%. The latest reported days to cover was 7.49, based on average daily volume of 487.0K.

The historical data currently tracked for UPB includes 42 reported entries from October 15, 2024 to July 31, 2026. Over that span, reported short interest has ranged from 230.7K to 4.8M shares.

Short Interest Over Time

Days to Cover Over Time

Extreme edge-case readings may reflect unusually low reported average volume.

Short Interest History for UPB

Settlement DateShort InterestPrior Short InterestChange SharesChange %Average Daily VolumeDays to Cover
July 31, 20263,648,5583,618,15130.4K+0.8%487.0K7.49
July 15, 20263,618,1514,105,630-487.5K-11.9%442.1K8.18
June 30, 20264,105,6303,898,229207.4K+5.3%718.3K5.72
June 15, 20263,898,2293,640,867257.4K+7.1%711.5K5.48
May 29, 20263,640,8673,397,759243.1K+7.2%534.4K6.81
May 15, 20263,397,7593,223,622174.1K+5.4%507.8K6.69
April 30, 20263,223,6223,022,894200.7K+6.6%564.2K5.71
April 15, 20263,022,8943,435,261-412.4K-12.0%576.9K5.24
March 31, 20263,435,2614,752,354-1.3M-27.7%991.8K3.46
March 13, 20264,752,3544,086,377666.0K+16.3%1.1M4.44
February 27, 20264,086,3773,529,797556.6K+15.8%2.2M1.83
February 13, 20263,529,7973,183,884345.9K+10.9%2.3M1.52
January 30, 20263,183,8843,451,544-267.7K-7.8%574.4K5.54
January 15, 20263,451,5443,486,600-35.1K-1.0%652.3K5.29
December 31, 20253,486,6002,983,568503.0K+16.9%606.0K5.75
December 15, 20252,983,5682,773,635209.9K+7.6%534.4K5.58
November 28, 20252,773,6352,994,056-220.4K-7.4%541.3K5.12
November 14, 20252,994,0562,929,47664.6K+2.2%383.3K7.81
October 31, 20252,929,4763,336,913-407.4K-12.2%371.5K7.88
October 15, 20253,336,9133,564,217-227.3K-6.4%324.8K10.27
September 15, 20253,011,6533,097,969-86.3K-2.8%662.7K4.54
August 29, 20253,097,9693,160,080-62.1K-2.0%352.9K8.78
August 15, 20253,160,0803,080,80079.3K+2.6%491.4K6.43
July 31, 20253,080,8003,781,146-700.3K-18.5%536.1K5.75
July 15, 20253,781,1464,109,973-328.8K-8.0%267.7K14.13
June 30, 20254,109,9733,610,360499.6K+13.8%718.7K5.72
June 13, 20253,610,3603,685,383-75.0K-2.0%358.8K10.06
May 30, 20253,685,3833,746,059-60.7K-1.6%386.0K9.55
May 15, 20253,746,0593,940,057-194.0K-4.9%362.9K10.32
April 30, 20253,940,0574,067,418-127.4K-3.1%296.8K13.28
April 15, 20254,067,4183,895,476171.9K+4.4%299.9K13.56
March 31, 20253,895,4763,712,999182.5K+4.9%251.0K15.52
February 28, 20253,702,5883,462,980239.6K+6.9%212.4K17.43
February 14, 20253,462,9802,717,049745.9K+27.5%292.6K11.83
January 31, 20252,717,0492,392,790324.3K+13.6%240.7K11.29
January 15, 20252,392,7902,302,00390.8K+3.9%254.4K9.4
December 31, 20242,302,0031,217,8281.1M+89.0%645.7K3.57
December 13, 20241,217,8281,205,87612.0K+1.0%231.8K5.25
November 29, 20241,205,8761,039,477166.4K+16.0%246.9K4.88
November 15, 20241,039,477647,123392.4K+60.6%241.4K4.31
October 31, 2024647,123230,692416.4K+180.5%343.0K1.89
October 15, 2024230,6920230.7K+100.0%379.1K1

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