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Passage BIO, Inc.

PASG
Exchange
Nasdaq
Industry
Biological Products, (No Diagnostic Substances)
SEC CIK
0001787297

No open-market purchases or sales by Passage BIO, Inc. insiders were filed in the last 90 days; 29 institutions reported holding it in 13F filings for Q2 2026, worth $6.82M 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
49.6K
Shares, settlement Oct 30, 2026
Change
−19.4K
−28.1% vs. Oct 15, 2026
Days to cover
3.99
Short interest ÷ average daily volume
Average daily volume
12.4K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 1,641,302 sharesNov 15, 2024: 1,626,722 sharesNov 29, 2024: 1,656,843 sharesDec 13, 2024: 1,698,721 sharesDec 31, 2024: 3,854,758 sharesJan 15, 2025: 1,802,332 sharesJan 31, 2025: 1,801,562 sharesFeb 14, 2025: 1,791,141 sharesFeb 28, 2025: 1,820,259 sharesMar 14, 2025: 1,688,288 sharesMar 31, 2025: 1,748,911 sharesApr 15, 2025: 1,824,918 sharesApr 30, 2025: 1,799,643 sharesMay 15, 2025: 1,736,311 sharesMay 30, 2025: 1,803,674 sharesJun 13, 2025: 1,781,795 sharesJun 30, 2025: 1,777,130 sharesJul 15, 2025: 108,282 sharesJul 31, 2025: 91,168 sharesAug 15, 2025: 97,134 sharesAug 29, 2025: 83,622 sharesSep 15, 2025: 81,562 sharesSep 30, 2025: 81,298 sharesOct 15, 2025: 82,479 sharesOct 31, 2025: 82,765 sharesNov 14, 2025: 90,146 sharesNov 28, 2025: 17,706 sharesDec 15, 2025: 15,577 sharesDec 31, 2025: 19,538 sharesJan 15, 2026: 15,142 sharesJan 30, 2026: 11,220 sharesFeb 13, 2026: 91,808 sharesFeb 27, 2026: 91,327 sharesMar 13, 2026: 98,369 sharesMar 31, 2026: 114,499 sharesApr 15, 2026: 68,090 sharesApr 30, 2026: 145,029 sharesMay 15, 2026: 162,626 sharesMay 29, 2026: 121,984 sharesJun 15, 2026: 92,581 sharesJun 30, 2026: 114,193 sharesJul 15, 2026: 124,628 sharesJul 31, 2026: 155,837 sharesAug 14, 2026: 136,935 sharesAug 31, 2026: 101,638 sharesSep 15, 2026: 97,008 sharesSep 30, 2026: 90,840 sharesOct 15, 2026: 68,917 sharesOct 30, 2026: 49,551 shares
Short interest in PASG by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 202649.6K−19.4K−28.1%12.4K3.99
Oct 15, 202668.9K−21.9K−24.1%19.8K3.47
Sep 30, 202690.8K−6.17K−6.4%24.7K3.67
Sep 15, 202697.0K−4.63K−4.6%30.3K3.20
Aug 31, 2026101.6K−35.3K−25.8%19.6K5.19
Aug 14, 2026136.9K−18.9K−12.1%10.4K13.12
Jul 31, 2026155.8K+31.2K+25.0%34.5K4.52
Jul 15, 2026124.6K+10.4K+9.1%48.2K2.58
Jun 30, 2026114.2K+21.6K+23.3%257.1K1.00
Jun 15, 202692.6K−29.4K−24.1%36.2K2.56
May 29, 2026122.0K−40.6K−25.0%33.5K3.64
May 15, 2026162.6K+17.6K+12.1%87.5K1.86
Apr 30, 2026145.0K+76.9K+113.0%206.8K1.00
Apr 15, 202668.1K−46.4K−40.5%46.9K1.45
Mar 31, 2026114.5K+16.1K+16.4%36.2K3.16
Mar 13, 202698.4K+7.04K+7.7%51.5K1.91
Feb 27, 202691.3K−481−0.5%18.3K4.99
Feb 13, 202691.8K+80.6K+718.3%49.7K1.85
Jan 30, 202611.2K−3.92K−25.9%53.7K1.00
Jan 15, 202615.1K−4.40K−22.5%129.6K1.00
Dec 31, 202519.5K+3.96K+25.4%40.4K1.00
Dec 15, 202515.6K−2.13K−12.0%53.6K1.00
Nov 28, 202517.7K−72.4K−80.4%42.3K1.00
Nov 14, 202590.1K+7.38K+8.9%43.0K2.09
Oct 31, 202582.8K+286+0.4%38.5K2.15
Oct 15, 202582.5K+1.18K+1.5%34.6K2.38
Sep 30, 202581.3K−264−0.3%31.9K2.55
Sep 15, 202581.6K−2.06K−2.5%44.1K1.85
Aug 29, 202583.6K−13.5K−13.9%24.6K3.40
Aug 15, 202597.1K+5.97K+6.5%34.3K2.83
Jul 31, 202591.2K−17.1K−15.8%128.8K1.00
Jul 15, 2025Split108.3K−1.67M−93.9%56.2K1.93
Jun 30, 20251.78M−4.67K−0.3%379.1K4.69
Jun 13, 20251.78M−21.9K−1.2%194.0K9.19
May 30, 20251.80M+67.4K+3.9%484.3K3.72
May 15, 20251.74M−63.3K−3.5%284.8K6.10
Apr 30, 20251.80M−25.3K−1.4%217.3K8.28
Apr 15, 20251.82M+76.0K+4.4%146.5K12.46
Mar 31, 20251.75M+60.6K+3.6%160.3K10.91
Mar 14, 20251.69M−132.0K−7.3%230.3K7.33
Feb 28, 20251.82M+29.1K+1.6%112.7K16.15
Feb 14, 20251.79M−10.4K−0.6%156.5K11.45
Jan 31, 20251.80M−7700.0%150.0K12.01
Jan 15, 20251.80M−2.05M−53.2%1.12M1.61
Dec 31, 20243.85M+2.16M+126.9%715.6K5.39
Dec 13, 20241.70M+41.9K+2.5%464.5K3.66
Nov 29, 20241.66M+30.1K+1.9%2.12M1.00
Nov 15, 20241.63M−14.6K−0.9%202.2K8.04
Oct 31, 20241.64M−41.1K−2.4%246.8K6.65

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 PASG by settlement date
Settlement dateSharesPriceValue
Jul 27, 2026258$4.94$1.27K
Jun 26, 202640$4.33$173.2
Jun 9, 20267$5.47$38.29
May 19, 202630$5.12$153.6
May 6, 20261$4.27$4.27
Apr 23, 20261$6.13$6.13
Apr 10, 20261,672$11.19$18.7K
Mar 10, 2026224$8.79$1.97K
Mar 4, 2026214$8.00$1.71K
Feb 23, 2026235$8.61$2.02K
Feb 13, 2026365$8.73$3.19K
Dec 30, 2025878$11.08$9.73K
Nov 28, 2025364$8.99$3.27K
Nov 26, 2025364$8.78$3.20K
Nov 14, 2025104$8.53$887.12
Nov 7, 202583$6.46$536.18
Sep 30, 20251$8.12$8.12
Sep 29, 2025140$8.00$1.12K
Sep 22, 20252,452$7.17$17.6K
Sep 12, 20251$6.97$6.97
Sep 9, 20259$7.03$63.27
Aug 26, 20251,126$7.48$8.42K
Aug 14, 2025508$6.38$3.24K
Jul 29, 20259,599$7.05$67.7K
Jul 28, 20259,603$7.44$71.4K
Jul 25, 202527,944$5.73$160.1K
Jul 24, 202564,071$5.78$370.3K
Jul 23, 202550,005$5.67$283.5K
Jul 22, 2025437$5.27$2.30K
Jul 21, 20258$5.56$44.48

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 PASG by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 11, 202610,045014,99467.0%
Nov 10, 202618,7185225,13074.5%
Nov 9, 202626901,01726.5%
Nov 6, 20265,698010,19955.9%
Nov 5, 202614,652018,72578.2%
Nov 4, 20265,60307,09279.0%
Nov 3, 20261,37002,00268.4%
Nov 2, 20266007,5320.8%
Oct 30, 202626503,5547.5%
Oct 29, 202680002,66130.1%
Oct 28, 20262704,5460.6%
Oct 27, 202654201,83129.6%
Oct 26, 2026211076527.6%
Oct 23, 20261,69406,20927.3%
Oct 22, 20268,08108,95690.2%
Oct 21, 202649101,70528.8%
Oct 20, 20261,35104,12732.7%
Oct 19, 20263,30105,93755.6%
Oct 16, 20264,929011,80941.7%
Oct 15, 20265,668011,18350.7%
Oct 14, 202696402,99032.2%
Oct 13, 20261,16523,24135.9%
Oct 12, 20266,275012,58749.9%
Oct 9, 20261,95502,94066.5%
Oct 8, 202644702,61517.1%
Oct 7, 20265,672010,01356.6%
Oct 6, 2026470088553.1%
Oct 5, 202677405,85513.2%
Oct 2, 20263,71804,04192.0%
Oct 1, 20263,49730013,05626.8%

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 PASG
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T23,14112219,30558114.0%
Sep 28, 2026T222,60115832,1741,00641.3%
Sep 21, 2026T28,53398111,0821,0277.1%
Sep 14, 2026T26,54520121,78527523.1%
Sep 7, 2026T28,793233108,1853577.5%
Aug 31, 2026T24,5592206,27219342.1%
Aug 24, 2026T26,70710925,14534921.1%
Aug 17, 2026T28,10017240,31644016.7%
Aug 10, 2026T22,8157912,58626418.3%
Aug 3, 2026T24,8367724,42026416.5%
Jul 27, 2026T26,19310820,35021823.3%
Jul 20, 2026T214,78034973,08040916.8%