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Passage BIO (PASG)

Passage BIO on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances).

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69K

Short interest

settlement 2026-10-15

3.5

Days to cover

-0.2 days vs prior

0.8%

Short share of volume

2026-11-02

258

Fails to deliver

settlement 2026-07-27

Mon 9 Nov

Next earnings

estimated date

$0

Insider flow, 90 days

0 buys, 0 sells

As of 2026-11-02.

Short interest

FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSON

As of 15 October 2026, short interest in PASG is 68,917 shares, down 28,091 shares over the last month. Over the last 48 readings it ranged from 11,220 shares (30 January 2026) to 3,854,758 shares (31 December 2024). The latest reading sits at the bottom of that range. At the reported average volume of 20K shares a day that is 3.5 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-10-1568,917-24.1%19,8363.47
2026-09-3090,840-6.4%24,7393.67
2026-09-1597,008-4.6%30,3153.20
2026-08-31101,638-25.8%19,6005.19
2026-08-14136,935-12.1%10,43513.12
2026-07-31155,837+25.0%34,4564.52
2026-07-15124,628+9.1%48,2392.58
2026-06-30114,193+23.3%257,1271.00
2026-06-1592,581-24.1%36,1792.56
2026-05-29121,984-25.0%33,5473.64
2026-05-15162,626+12.1%87,5321.86
2026-04-30145,029+113.0%206,8121.00
2026-04-1568,090-40.5%46,9381.45
2026-03-31114,499+16.4%36,1913.16
2026-03-1398,369+7.7%51,5451.91
2026-02-2791,327-0.5%18,3044.99
2026-02-1391,808+718.3%49,7311.85
2026-01-3011,220-25.9%53,6811.00
2026-01-1515,142-22.5%129,5771.00
2025-12-3119,538+25.4%40,3871.00
2025-12-1515,577-12.0%53,5591.00
2025-11-2817,706-80.4%42,3021.00
2025-11-1490,146+8.9%43,0312.09
2025-10-3182,765+0.3%38,5452.15
2025-10-1582,479+1.4%34,6472.38
2025-09-3081,298-0.3%31,8742.55
2025-09-1581,562-2.5%44,0691.85
2025-08-2983,622-13.9%24,6293.40
2025-08-1597,134+6.5%34,2732.83
2025-07-3191,168-15.8%128,7721.00
2025-07-15108,282-93.9%56,2221.93
2025-06-301,777,130-0.3%379,0644.69
2025-06-131,781,795-1.2%193,9569.19
2025-05-301,803,674+3.9%484,2833.72
2025-05-151,736,311-3.5%284,7606.10
2025-04-301,799,643-1.4%217,3468.28
2025-04-151,824,918+4.3%146,45212.46
2025-03-311,748,911+3.6%160,32710.91
2025-03-141,688,288-7.3%230,3447.33
2025-02-281,820,259+1.6%112,68216.15
2025-02-141,791,141-0.6%156,47411.45
2025-01-311,801,562-0.0%150,00212.01
2025-01-151,802,332-53.2%1,118,9251.61
2024-12-313,854,758+126.9%715,6105.39
2024-12-131,698,721+2.5%464,4943.66
2024-11-291,656,843+1.9%2,115,7791.00
2024-11-151,626,722-0.9%202,2318.04
2024-10-311,641,302-2.4%246,8406.65

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of PASG volume is 0.8%, down 26.8 points over the last five sessions. Over the last 30 readings it ranged from 0.6% (28 October 2026) to 92.0% (2 October 2026). The latest reading sits at the bottom of that range. The latest reading is 35.9 points below the 30-session average of 36.7%, on 8K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-11-02608K0.8%0
2026-10-302654K7.5%0
2026-10-298003K30.1%0
2026-10-28275K0.6%0
2026-10-275422K29.6%0
2026-10-2621176527.6%0
2026-10-232K6K27.3%0
2026-10-228K9K90.2%0
2026-10-214912K28.8%0
2026-10-201K4K32.7%0
2026-10-193K6K55.6%0
2026-10-165K12K41.7%0
2026-10-156K11K50.7%0
2026-10-149643K32.2%0
2026-10-131K3K35.9%2
2026-10-126K13K49.9%0
2026-10-092K3K66.5%0
2026-10-084473K17.1%0
2026-10-076K10K56.6%0
2026-10-0647088553.1%0
2026-10-057746K13.2%0
2026-10-024K4K92.0%0
2026-10-013K13K26.8%300
2026-09-307K17K43.6%0
2026-09-294K13K30.2%0
2026-09-282K8K23.5%0
2026-09-253905K7.1%0
2026-09-241K3K42.7%0
2026-09-2334055561.3%0
2026-09-222K9K26.4%0

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 27 July 2026, the fails-to-deliver balance in PASG is 258 shares, up 218 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (12 September 2025) to 64,071 shares (24 July 2025). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-07-27258$4.94$1K
2026-06-2640$4.33$173
2026-06-097$5.47$38
2026-05-1930$5.12$154
2026-05-061$4.27$4
2026-04-231$6.13$6
2026-04-101,672$11.19$19K
2026-03-10224$8.79$2K
2026-03-04214$8.00$2K
2026-02-23235$8.61$2K
2026-02-13365$8.73$3K
2025-12-30878$11.08$10K
2025-11-28364$8.99$3K
2025-11-26364$8.78$3K
2025-11-14104$8.53$887
2025-11-0783$6.46$536
2025-09-301$8.12$8
2025-09-29140$8.00$1K
2025-09-222,452$7.17$18K
2025-09-121$6.97$7
2025-09-099$7.03$63
2025-08-261,126$7.48$8K
2025-08-14508$6.38$3K
2025-07-299,599$7.05$68K
2025-07-289,603$7.44$71K
2025-07-2527,944$5.73$160K
2025-07-2464,071$5.78$370K
2025-07-2350,005$5.67$284K
2025-07-22437$5.27$2K
2025-07-218$5.56$44

Insider trades

SEC Form 4, newest first. JSON

No open-market insider trades were reported for PASG in the last 90 days. The most recent filings are listed below. Latest filing: Nichols Weston (TenPercentOwner) on 2026-06-25.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-06-25Nichols WestonTenPercentOwnerBuy50K$4.12$206K674K
2026-01-08Borthwick KathleenCFOSell2K$18.44$38K5K
2026-01-08Borthwick KathleenCFOExercise or conversion5Kprice not stated in the filingnot stated7K
2026-01-08Chou WilliamPRESIDENT AND CEOSell4K$18.44$75K7K
2026-01-08Chou WilliamPRESIDENT AND CEOExercise or conversion10Kprice not stated in the filingnot stated11K
2025-09-15Nichols WestonTenPercentOwnerBuy12K$6.99$83K624K
2025-09-15Lynx1 Capital Management LP10% ownerBuy12K$6.99$83K624K
2025-09-12Nichols WestonTenPercentOwnerBuy20K$6.99$138K612K
2025-09-12Lynx1 Capital Management LP10% ownerBuy20K$6.99$138K612K
2025-09-11Nichols WestonTenPercentOwnerBuy325$6.96$2K592K
2025-09-11Lynx1 Capital Management LP10% ownerBuy325$6.96$2K592K
2025-07-24Lynx1 Capital Management LP10% ownerBuy66K$5.71$379K592K
2025-07-23Lynx1 Capital Management LP10% ownerBuy49K$5.74$283K525K
2025-07-22Lynx1 Capital Management LP10% ownerBuy13K$5.44$71K476K
2025-06-26ORBIMED ADVISORS LLC10% ownerSell213K$0.33$70K6.1M
2025-06-25ORBIMED ADVISORS LLC10% ownerSell139K$0.33$46K6.3M
2025-06-24ORBIMED ADVISORS LLC10% ownerSell232K$0.35$81K6.4M
2025-04-24ORBIMED ADVISORS LLCTenPercentOwnerSell68K$0.32$22K6.7M
2025-04-23ORBIMED ADVISORS LLCTenPercentOwnerSell89K$0.34$30K6.7M
2025-04-22ORBIMED ADVISORS LLCTenPercentOwnerSell78K$0.34$27K6.8M
2025-04-17OrbiMed Capital GP VII LLCTenPercentOwnerSell77K$0.33$25K6.9M
2025-04-16OrbiMed Capital GP VII LLCTenPercentOwnerSell62K$0.33$20K7.0M
2025-04-15OrbiMed Capital GP VII LLCTenPercentOwnerSell10K$0.38$4K7.0M
2025-02-11Borthwick KathleenCFOSell3K$0.53$2K41K
2025-02-10Borthwick KathleenCFOExercise or conversion8Kprice not stated in the filingnot stated44K
2025-01-14ORBIMED ADVISORS LLCTenPercentOwnerSell79K$0.60$47K7.0M
2025-01-13ORBIMED ADVISORS LLCTenPercentOwnerSell18K$0.64$12K7.1M
2025-01-10ORBIMED ADVISORS LLCTenPercentOwnerSell126K$0.66$83K7.1M
2025-01-08OrbiMed Capital GP VII LLCTenPercentOwnerSell75K$0.68$51K7.3M
2025-01-07OrbiMed Capital GP VII LLCTenPercentOwnerSell53K$0.71$37K7.3M
2025-01-06OrbiMed Capital GP VII LLCTenPercentOwnerSell19K$0.77$15K7.4M
2024-12-27Lynx1 Capital Management LPTenPercentOwnerBuy374K$0.65$243K9.3M
2024-12-20OrbiMed Capital GP VII LLCTenPercentOwnerSell230K$0.60$138K7.4M
2024-12-11ORBIMED ADVISORS LLCTenPercentOwnerSell80$0.80$647.6M
2024-12-10ORBIMED ADVISORS LLCTenPercentOwnerSell8K$0.80$6K7.6M
2024-12-09ORBIMED ADVISORS LLCTenPercentOwnerSell54K$0.84$46K7.6M
2024-12-06OrbiMed Capital GP VII LLCTenPercentOwnerSell21K$0.82$17K7.7M
2024-12-04OrbiMed Capital GP VII LLCTenPercentOwnerSell76K$0.79$60K7.7M
2024-11-27Lynx1 Capital Management LPTenPercentOwnerBuy29K$0.67$20K8.9M
2024-11-26Lynx1 Capital Management LPTenPercentOwnerBuy167K$0.71$119K8.9M
2024-11-25Lynx1 Capital Management LPTenPercentOwnerBuy260K$0.56$146K8.7M
2024-09-19ORBIMED ADVISORS LLCTenPercentOwnerSell39K$0.71$28K7.8M
2024-09-18OrbiMed Capital GP VII LLCTenPercentOwnerSell26K$0.73$19K7.8M
2024-09-17OrbiMed Capital GP VII LLCTenPercentOwnerSell111K$0.73$81K7.9M
2024-09-16OrbiMed Capital GP VII LLCTenPercentOwnerSell63K$0.74$47K8.0M
2024-02-13Forman Mark SCHIEF MEDICAL OFFICERSell2K$0.97$2K49K
2024-02-13Borthwick KathleenSVP, INTERIM CFOSell1K$0.97$1K28K
2024-02-10Forman Mark SCHIEF MEDICAL OFFICERExercise or conversion5Kprice not stated in the filingnot stated50K
2024-02-10Borthwick KathleenSVP, INTERIM CFOExercise or conversion4Kprice not stated in the filingnot stated30K
2024-01-02Cale Edgar B.GC & Corporate SecretarySell16K$0.91$14K46K
2024-01-02Borthwick KathleenSVP, Interim CFOSell11K$0.91$10K26K
2024-01-02Forman Mark SChief Medical OfficerSell16K$0.91$14K45K
2023-12-31Cale Edgar B.GC & Corporate SecretaryExercise or conversion50Kprice not stated in the filingnot stated62K
2023-12-31Borthwick KathleenSVP, Interim CFOExercise or conversion30Kprice not stated in the filingnot stated37K
2023-12-31Forman Mark SChief Medical OfficerExercise or conversion50Kprice not stated in the filingnot stated61K
2023-07-28King SimonaChief Financial OfficerSell11K$0.88$10K24K
2023-07-28King SimonaChief Financial OfficerExercise or conversion31K$0.00$035K
2023-06-28ORBIMED ADVISORS LLCTenPercentOwnerBuy575K$0.84$483K8.0M
2023-06-27ORBIMED ADVISORS LLCTenPercentOwnerBuy617K$0.84$519K7.5M
2023-06-16Fotopoulos AlexandrosChief Technical OfficerSell4K$0.93$4K29K
2023-06-15Fotopoulos AlexandrosChief Technical OfficerExercise or conversion13K$0.00$033K
2023-04-18King SimonaChief Financial OfficerSell2K$1.05$2K2K
2023-04-18King SimonaChief Financial OfficerExercise or conversion6K$0.00$06K
2022-12-01Kapadia SandipDirectorSell5K$1.19$6K0
2022-11-22Fotopoulos AlexandrosChief Technical OfficerSell4K$1.33$5K20K
2022-11-22Fotopoulos AlexandrosChief Technical OfficerExercise or conversion13K$0.00$024K
2022-09-19Toernsen Monika MariaChief Commercial OfficerSell2K$1.51$3K3K
2022-09-15Toernsen Monika MariaChief Commercial OfficerExercise or conversion5Kprice not stated in the filingnot stated5K
2022-05-04OrbiMed Capital GP VII LLCTenPercentOwnerBuy304K$1.94$589K6.8M
2022-05-03OrbiMed Capital GP VII LLCTenPercentOwnerBuy222K$1.93$427K6.5M
2022-03-21Goldsmith Bruce ACEO and PresidentBuy10K$3.15$32K16K
2022-01-20ORBIMED ADVISORS LLCTenPercentOwnerBuy51K$5.00$254K6.3M
2022-01-20OrbiMed Capital GP VII LLCTenPercentOwnerBuy369K$5.42$2.0M6.6M
2022-01-19OrbiMed Capital GP VII LLCTenPercentOwnerBuy43K$5.11$221K6.3M
2022-01-18OrbiMed Capital GP VII LLCTenPercentOwnerBuy115K$5.46$626K6.2M
2022-01-14OrbiMed Capital GP VII LLCTenPercentOwnerBuy10K$5.60$58K6.1M
2022-01-13OrbiMed Capital GP VII LLCTenPercentOwnerBuy42K$5.52$231K6.1M
2022-01-12OrbiMed Capital GP VII LLCTenPercentOwnerBuy100K$5.65$565K6.1M
2022-01-11OrbiMed Capital GP VII LLCTenPercentOwnerBuy8K$5.53$45K6.0M
2021-12-08Quigley Jill M.Chief Operating OfficerExercise or conversion72K$0.23$17K369K
2021-05-21Goldsmith Bruce ACEO and PresidentBuy2K$13.12$26K6K
2021-05-21Morris Richard StevenChief Financial OfficerBuy2K$13.82$30K5K
2021-03-15Romano GaryChief Medical OfficerSell2K$21.86$35K0
2021-03-15Romano GaryChief Medical OfficerSell8K$20.95$176K2K
2021-03-15Romano GaryChief Medical OfficerExercise or conversion10K$8.07$81K10K
2021-01-20Quigley Jill M.Chief Operating OfficerSell1K$30.01$39K295K
2021-01-14Quigley Jill M.Chief Operating OfficerSell16K$30.10$491K297K
2020-03-24Countouriotis AthenaDirectorBuy10K$14.98$150K19K
2020-03-03Cale Edgar B.GC and Corporate SecretaryBuy2K$18.00$36K2K
2020-03-03Countouriotis AthenaDirectorBuy9K$18.00$160K9K
2020-03-03Fotopoulos AlexandrosChief Technical OfficerBuy6K$18.00$99K6K
2020-03-03Goldsmith Bruce ACEO and PresidentBuy1K$18.00$20K1K
2020-03-03Islam SaqibDirectorBuy5K$18.00$90K5K
2020-03-03Kapadia SandipDirectorBuy5K$18.00$90K5K
2020-03-03Morris Richard StevenChief Financial OfficerBuy400$18.00$7K400
2020-03-03Quigley Jill M.Chief Operating OfficerBuy2K$18.00$27K311K
2020-03-03Quigley Jill M.Chief Operating OfficerBuy1K$18.00$18K1K
2020-03-03Yamada TadatakaDirectorBuy7K$18.00$117K656K
2020-03-03Heron Patrick JDirector,TenPercentOwnerConversion3.0Mprice not stated in the filingnot stated3.0M
2020-03-03Heron Patrick JDirector,TenPercentOwnerConversion1.0Mprice not stated in the filingnot stated4.0M

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

Planned sales (Form 144)

Newest first. JSON

1 Form 144 notice on file for PASG worth $75K at the prices reported; 0 in the last 90 days worth $0. Latest: Chou William filed on 2026-01-09 to sell 4,076 shares ($75K) from 2026-01-09.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-01-09Chou WilliamOfficer4K$75K0.128%2026-01-09Maxim Group

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

5 holders report 5% or more of PASG in their latest filing, 2 on Schedule 13D (active intent). The largest reported stake is Weston Nichols at 21.0% of the class (673,759 shares), filed 2026-07-02 for an event on 2026-06-25.

FiledFormHolderSharesOf classEvent
2026-08-1413G/Ano. 1Vestal Point Capital, LPinvestment adviser, partnership00.0%2026-06-30
2026-08-1413G/Ano. 1Ryan Wilderparent holding company, individual00.0%2026-06-30
2026-07-0213DWeston Nicholsindividual674K21.0%2026-06-25
2026-07-0213DLynx1 Capital Management LPpartnership674K21.0%2026-06-25
2026-06-2513GDavid Paolellaparent holding company, individual235K7.3%2026-06-18
2026-06-2513GBaselake Management, LLCinvestment adviser, other entity235K7.3%2026-06-18
2026-06-2513GBaselake Partners, LPpartnership235K7.3%2026-06-18

13F holders

Tracked managers holding PASG at their latest 13F. JSON

1 of the 30 tracked managers held PASG at their latest 13F, $234K in total at quarter-end prices. Renaissance Technologies is the largest at $234K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 0 added shares and 1 cut.

FundQuarterSharesValueOf portfolioChange in shares
Renaissance Technologies2026-06-3048K$234K0.00%-86K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

What this page is

Passage BIO in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Passage BIO (PASG), SEC CIK 1787297, listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances). The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest
FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-10-15.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-07-27.JSON and CSV
Planned sales
SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-01-09.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-14.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Earnings dates
SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-03-03.JSON and CSV
Insider trades
SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-06-25.JSON and CSV
Company record
EDGAR filing index for CIK 1787297Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
10 requests a minute without a key, 30 with a free key from a free account.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other companies the SEC classifies as biological products, (no diagnostic substances)

Other company pages

Datasets

Frequently Asked Questions

How much of PASG is sold short?
68,917 shares were held short at the 2026-10-15 settlement, 3.5 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is PASG's daily short volume?
On 2026-11-02, 60 of the 7,532 PASG shares reported to FINRA were sold short, 0.8% of the day's reported volume. Short volume is a flow for one day, not a position.
Does PASG have fails to deliver?
The SEC's latest file shows 258 PASG shares failed to deliver at settlement 2026-07-27. Fails are reported per settlement date and published twice a month with a lag.
Are PASG insiders buying or selling?
No open-market insider trades were reported for PASG in the last 90 days. The most recent filings are listed below. Latest filing: Nichols Weston (TenPercentOwner) on 2026-06-25.
Have PASG insiders filed to sell?
1 Form 144 notice on file for PASG worth $75K at the prices reported; 0 in the last 90 days worth $0. Latest: Chou William filed on 2026-01-09 to sell 4,076 shares ($75K) from 2026-01-09.
Who owns 5% or more of PASG?
5 holders report 5% or more of PASG in their latest filing, 2 on Schedule 13D (active intent). The largest reported stake is Weston Nichols at 21.0% of the class (673,759 shares), filed 2026-07-02 for an event on 2026-06-25.
Which tracked 13F managers own PASG?
1 of the 30 tracked 13F managers held PASG shares at their latest filing, $234K in all. The largest: Renaissance Technologies (48K shares, $234K).

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.