XOOMAR

Climb Bio (CLYM)

Climb 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.

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9.8M

Short interest

settlement 2026-10-15

10.3

Days to cover

+4.7 days vs prior

73.9%

Short share of volume

2026-11-02

30

Fails to deliver

settlement 2026-10-13

Thu 5 Nov

Next earnings

estimated date

-$1.4M

Insider flow, 90 days

0 buys, 1 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 CLYM is 9,787,492 shares, up 1,279,138 shares over the last month. Over the last 48 readings it ranged from 861,346 shares (15 October 2025) to 9,787,492 shares (15 October 2026). The latest reading sits at the top of that range. At the reported average volume of 946K shares a day that is 10.3 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-10-159,787,492+0.7%946,17810.34
2026-09-309,718,558+14.2%1,721,6315.64
2026-09-158,508,354+16.5%1,880,0634.53
2026-08-317,300,939-3.4%1,233,6935.92
2026-08-147,557,264+7.4%1,199,8516.30
2026-07-317,037,695+2.4%1,042,2146.75
2026-07-156,871,210+34.8%1,361,5825.05
2026-06-305,096,670+69.8%1,725,6622.95
2026-06-153,001,897+57.3%1,530,3351.96
2026-05-291,908,617-8.7%676,3272.82
2026-05-152,090,647+17.7%972,9702.15
2026-04-301,776,821+10.3%876,8282.03
2026-04-151,610,632-9.3%532,2643.03
2026-03-311,775,067-1.6%443,2454.00
2026-03-131,803,792+2.9%570,0753.16
2026-02-271,753,708-8.6%619,8632.83
2026-02-131,918,833-5.5%555,6563.45
2026-01-302,031,687+12.8%653,6283.11
2026-01-151,801,497-0.8%879,0452.05
2025-12-311,816,835-18.1%1,638,6691.11
2025-12-152,219,442+18.0%3,204,0071.00
2025-11-281,881,380+22.2%330,8825.69
2025-11-141,540,104+19.5%413,6893.72
2025-10-311,289,125+49.7%1,051,9351.23
2025-10-15861,346-6.3%844,6021.02
2025-09-30919,355+4.6%426,6522.15
2025-09-15878,949-27.2%444,3481.98
2025-08-291,206,690+7.9%765,2551.58
2025-08-151,118,221-14.9%908,4981.23
2025-07-311,313,475-5.0%201,1886.53
2025-07-151,382,404-2.2%217,1846.37
2025-06-301,413,053-34.3%564,7422.50
2025-06-132,151,584-2.0%234,1799.19
2025-05-302,194,549+0.0%136,82116.04
2025-05-152,194,652-5.6%143,42215.30
2025-04-302,323,869+1.0%106,20521.88
2025-04-152,300,096+4.8%205,47811.19
2025-03-312,195,271+0.1%123,39217.79
2025-03-142,192,464+9.8%234,6589.34
2025-02-281,996,663+5.2%446,7024.47
2025-02-141,898,020-55.8%342,1515.55
2025-01-314,294,214-0.4%253,63116.93
2025-01-154,310,782-10.5%826,2595.22
2024-12-314,816,219-2.3%525,2699.17
2024-12-134,930,125+0.7%139,74335.28
2024-11-294,895,678-0.9%235,85120.76
2024-11-154,940,821-0.8%379,61013.02
2024-10-314,978,650+5.9%275,39418.08

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of CLYM volume is 73.9%, up 51.7 points over the last five sessions. Over the last 30 readings it ranged from 15.8% (27 October 2026) to 79.8% (28 October 2026). The latest reading sits at the top of that range. The latest reading is 15.2 points above the 30-session average of 58.7%, on 364K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-11-02269K364K73.9%0
2026-10-30177K254K69.6%0
2026-10-29153K248K61.6%0
2026-10-28357K448K79.8%0
2026-10-27331K2.1M15.8%64,455
2026-10-26376K1.7M22.2%13,580
2026-10-23107K139K77.3%0
2026-10-22100K155K64.8%0
2026-10-21232K336K69.0%0
2026-10-20228K436K52.3%0
2026-10-19168K350K48.0%2,932
2026-10-16175K292K59.8%5,376
2026-10-15120K164K73.0%0
2026-10-14227K391K58.1%0
2026-10-13145K242K59.7%0
2026-10-12237K315K75.1%0
2026-10-09160K217K73.4%92
2026-10-08335K493K67.9%0
2026-10-07176K281K62.8%400
2026-10-06260K349K74.4%0
2026-10-05183K411K44.6%0
2026-10-02324K575K56.4%0
2026-10-01142K293K48.6%0
2026-09-30156K294K53.2%0
2026-09-29223K436K51.0%5,262
2026-09-28144K317K45.4%1
2026-09-25249K622K40.0%0
2026-09-24434K752K57.7%9,353
2026-09-23536K917K58.4%19,036
2026-09-22195K289K67.5%0

Fails to deliver

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

As of 13 October 2026, the fails-to-deliver balance in CLYM is 30 shares, down 219 shares over the last settlement date. Over the last 30 readings it ranged from 4 shares (28 August 2026) to 92,256 shares (2 June 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-10-1330$10.83$325
2026-09-28249$11.66$3K
2026-09-241,992$12.52$25K
2026-09-2134,170$14.05$480K
2026-09-1870$14.06$984
2026-09-09279$15.90$4K
2026-09-0814,543$15.52$226K
2026-08-284$15.06$60
2026-08-2736$16.08$579
2026-08-24975$17.28$17K
2026-08-2183$17.02$1K
2026-08-1727,387$16.33$447K
2026-08-1449$14.73$722
2026-08-043,560$11.81$42K
2026-07-17154$12.58$2K
2026-07-16139$13.87$2K
2026-07-146,255$13.21$83K
2026-07-0254$13.29$718
2026-06-2936,701$13.08$480K
2026-06-262,301$12.66$29K
2026-06-25680$12.75$9K
2026-06-247,452$12.30$92K
2026-06-15818$11.44$9K
2026-06-1058,000$11.14$646K
2026-06-0292,256$11.80$1.1M
2026-06-01363$10.96$4K
2026-05-19100$9.88$988
2026-05-14103$11.41$1K
2026-05-137,860$11.17$88K
2026-04-2464$9.02$577

Insider trades

SEC Form 4, newest first. JSON

Insiders at CLYM reported 1 open-market sell worth $1.4M in the last 90 days and no open-market buys. Latest filing: RA CAPITAL MANAGEMENT, L.P. (Director, 10% owner) on 2026-09-28.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-28RA CAPITAL MANAGEMENT, L.P.Director, 10% ownerExercise or conversion10K$7.89$79K30K
2026-09-28RA CAPITAL MANAGEMENT, L.P.Director, 10% ownerExercise or conversion10K$3.00$30K20K
2026-09-28RA CAPITAL MANAGEMENT, L.P.Director, 10% ownerExercise or conversion40K$1.29$52K70K
2026-09-28RA CAPITAL MANAGEMENT, L.P.Director, 10% ownerExercise or conversion10K$3.46$35K10K
2026-09-15Thomas Stephen BasilDirectorSell100K$13.67$1.4M468K
2026-06-29Brennan AoifePresident and CEOSell31K$13.17$407K88K
2026-06-27Brennan AoifePresident and CEOExercise or conversion69Kprice not stated in the filingnot stated119K
2026-02-26Thomas Stephen BasilDirectorSell16K$7.01$114K155K
2026-02-25Thomas Stephen BasilDirectorSell34K$7.00$236K171K
2026-02-13Thomas Stephen BasilDirectorSell10K$5.81$58K205K
2026-02-12Thomas Stephen BasilDirectorSell90K$5.23$471K215K
2026-01-05RA Capital Healthcare Fund LPDirector,TenPercentOwnerBuy7K$3.50$25K3.4M
2026-01-05RA CAPITAL MANAGEMENT, L.P.Director, 10% ownerBuy7K$3.50$25K3.4M
2025-12-12Kolchinsky PeterDirector,TenPercentOwnerBuy101K$2.86$290K3.4M
2025-12-12RA CAPITAL MANAGEMENT, L.P.Director, 10% ownerBuy101K$2.86$290K3.4M
2025-12-11Kolchinsky PeterDirector,TenPercentOwnerReturned to company20.4M$0.00$03.1M
2025-12-11Kolchinsky PeterDirector,TenPercentOwnerBuy213K$2.18$465K3.3M
2025-12-11RA CAPITAL MANAGEMENT, L.P.Director, 10% ownerBuy213K$2.18$465K3.3M
2025-12-11RA CAPITAL MANAGEMENT, L.P.Director, 10% ownerReturned to company20.4M$0.00$03.1M
2025-08-07Thomas Stephen BasilDirectorGrant100K$0.00$0305K
2025-06-30Brennan AoifePresident and CEOSell21K$1.22$25K48K
2025-06-27Thomas Stephen BasilDirectorExercise or conversion25Kprice not stated in the filingnot stated204K
2025-06-27Brennan AoifePresident and CEOExercise or conversion69Kprice not stated in the filingnot stated69K
2025-06-20Pimblett EmilySVP, Finance & CAOSell1K$1.24$2K19K
2025-06-18Pimblett EmilySVP, Finance & CAOExercise or conversion5Kprice not stated in the filingnot stated20K
2025-03-27Thomas Stephen BasilDirectorExercise or conversion25Kprice not stated in the filingnot stated179K
2025-03-20Pimblett EmilySVP, Finance & CAOSell1K$1.31$2K15K
2025-03-18Pimblett EmilySVP, Finance & CAOExercise or conversion5Kprice not stated in the filingnot stated16K
2025-01-01Thomas Stephen BasilDirectorExercise or conversion50Kprice not stated in the filingnot stated154K
2024-12-19Pimblett EmilyCHIEF ACCOUNTING OFFICERSell1K$2.02$2K11K
2024-12-18Pimblett EmilyCHIEF ACCOUNTING OFFICERExercise or conversion5Kprice not stated in the filingnot stated13K

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

4 Form 144 notices on file for CLYM worth $2.7M at the prices reported; 1 in the last 90 days worth $1.5M. Latest: STEPHEN THOMAS filed on 2026-09-15 to sell 100,000 shares ($1.5M) from 2026-09-15.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-09-15STEPHEN THOMASDirector100K$1.5M0.174%2026-09-15Morgan Stanley Smith Barney LLC Executive Financial Services
2026-06-30AOIFE BRENNANOfficer, Director31K$407K0.054%2026-06-29E-TRADE FINANCIAL CORPORATION
2026-02-25STEPHEN THOMASDirector50K$318K0.073%2026-02-25Morgan Stanley Smith Barney LLC Executive Financial Services
2026-02-12STEPHEN THOMASDirector100K$556K0.147%2026-02-12Morgan Stanley Smith Barney LLC Executive Financial Services

Large holders (13D and 13G)

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

16 holders report 5% or more of CLYM in their latest filing, 5 on Schedule 13D (active intent). The largest reported stake is Peter Kolchinsky at 33.0% of the class (23,249,186 shares), filed 2026-07-07 for an event on 2026-07-02.

FiledFormHolderSharesOf classEvent
2026-10-2813GJames E. Flynnindividual3.1M5.3%2026-10-27
2026-10-2813GDeerfield Partners, L.P.partnership3.1M5.3%2026-10-27
2026-10-2813GDeerfield Management Company, L.P.partnership3.1M5.3%2026-10-27
2026-10-2813GDeerfield Mgmt, L.P.partnership3.1M5.3%2026-10-27
2026-10-2713GBlackRock, Inc.parent holding company2.9M5.0%2026-09-30
2026-08-1413G/Ano. 1MPM BioImpact LLCinvestment adviser00.0%2026-06-30
2026-07-0813GAbigail P. Johnsonindividual6.8M11.9%2026-06-30
2026-07-0813GFMR LLCparent holding company6.8M11.9%2026-06-30
2026-07-0713D/Ano. 10Peter Kolchinskyparent holding company, individual23.2M33.0%2026-07-02
2026-07-0713D/Ano. 10RA Capital Management, L.P.investment adviser, partnership23.2M33.0%2026-07-02
2026-07-0713D/Ano. 10Rajeev Shahparent holding company, individual23.2M33.0%2026-07-02
2026-07-0713D/Ano. 10RA Capital Healthcare Fund, L.P.partnership16.9M24.1%2026-07-02
2026-07-0713D/Ano. 10RA Capital Nexus Fund III, L.P.partnership3.7M6.4%2026-07-02
2026-04-2913D/Ano. 9Sera Medicines, LLCother entity2.5M4.3%2026-04-27
2025-10-1613D/Ano. 5AI ETI LLCother entity00.0%2025-10-14
2025-10-1613D/Ano. 5Access Industries Holdings LLCother entity00.0%2025-10-14
2025-10-1613D/Ano. 5Access Industries Management, LLCother entity00.0%2025-10-14
2025-10-1613D/Ano. 5Len Blavatnikindividual00.0%2025-10-14
2025-09-1813GPontifax VI G.P. L.P.partnership5.2M7.7%2024-06-27
2025-09-1813GPontifax Management 4 G.P. (2015) Ltd.corporation5.2M7.7%2024-06-27
2025-09-1813GRan Nussbaumindividual5.2M7.7%2024-06-27
2025-09-1813GTomer Karivindividual5.2M7.7%2024-06-27

13F holders

Tracked managers holding CLYM at their latest 13F. JSON

5 of the 30 tracked managers held CLYM at their latest 13F, $33.6M in total at quarter-end prices. Citadel Advisors is the largest at $16.9M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 3 cut.

FundQuarterSharesValueOf portfolioChange in shares
Citadel Advisors2026-06-301.3M$16.9M0.00%+952K
Millennium Management2026-06-30908K$11.8M0.00%-368K
Renaissance Technologies2026-06-30193K$2.5M0.00%-25K
Two Sigma Investments2026-06-30148K$1.9M0.00%-162K
D. E. Shaw & Co.2026-06-3029K$376K0.00%new

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

Climb 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 Climb Bio (CLYM), SEC CIK 1768446, listed on Nasdaq. 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 2026-10-13.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 2026-09-15.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 2026-10-28.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 2026-08-06.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 2026-09-28.JSON and CSV
Company record
EDGAR filing index for CIK 1768446Ticker, 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.

Datasets

Frequently Asked Questions

How much of CLYM is sold short?
9,787,492 shares were held short at the 2026-10-15 settlement, 10.3 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 CLYM's daily short volume?
On 2026-11-02, 269,026 of the 364,043 CLYM shares reported to FINRA were sold short, 73.9% of the day's reported volume. Short volume is a flow for one day, not a position.
Does CLYM have fails to deliver?
The SEC's latest file shows 30 CLYM shares failed to deliver at settlement 2026-10-13. Fails are reported per settlement date and published twice a month with a lag.
Are CLYM insiders buying or selling?
Insiders at CLYM reported 1 open-market sell worth $1.4M in the last 90 days and no open-market buys. Latest filing: RA CAPITAL MANAGEMENT, L.P. (Director, 10% owner) on 2026-09-28.
Have CLYM insiders filed to sell?
4 Form 144 notices on file for CLYM worth $2.7M at the prices reported; 1 in the last 90 days worth $1.5M. Latest: STEPHEN THOMAS filed on 2026-09-15 to sell 100,000 shares ($1.5M) from 2026-09-15.
Who owns 5% or more of CLYM?
16 holders report 5% or more of CLYM in their latest filing, 5 on Schedule 13D (active intent). The largest reported stake is Peter Kolchinsky at 33.0% of the class (23,249,186 shares), filed 2026-07-07 for an event on 2026-07-02.
Which tracked 13F managers own CLYM?
5 of the 30 tracked 13F managers held CLYM shares at their latest filing, $33.6M in all. The largest: Ken Griffin's Citadel Advisors (1.3M shares, $16.9M), Izzy Englander's Millennium Management (908K shares, $11.8M), Renaissance Technologies (193K shares, $2.5M), Two Sigma Investments (148K shares, $1.9M), D. E. Shaw & Co. (29K shares, $376K).

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