XOOMAR

Alto Neuroscience (ANRO)

Alto Neuroscience on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on NYSE.

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5.2M

Short interest

settlement 2026-10-15

7.5

Days to cover

+1.0 days vs prior

66.8%

Short share of volume

2026-11-02

48

Fails to deliver

settlement 2026-10-14

Wed 11 Nov

Next earnings

estimated date

-$3.6M

Insider flow, 90 days

0 buys, 3 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 ANRO is 5,204,407 shares, up 1,030,325 shares over the last month. Over the last 48 readings it ranged from 1,587,188 shares (30 April 2026) to 5,204,407 shares (15 October 2026). The latest reading sits at the top of that range. At the reported average volume of 694K shares a day that is 7.5 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-10-155,204,407+11.7%694,1077.50
2026-09-304,660,269+11.7%718,1876.49
2026-09-154,174,082+8.8%459,4939.08
2026-08-313,836,359+7.9%475,8308.06
2026-08-143,556,066+9.9%475,9997.47
2026-07-313,235,210+4.5%434,2657.45
2026-07-153,096,805+28.5%719,8854.30
2026-06-302,410,038+48.6%805,5272.99
2026-06-151,622,197-4.1%373,5914.34
2026-05-291,692,318+5.0%305,8255.53
2026-05-151,611,876+1.6%343,5344.69
2026-04-301,587,188-27.6%261,9886.06
2026-04-152,190,772+6.8%407,7485.37
2026-03-312,051,993+3.4%370,0375.55
2026-03-131,984,788-2.9%249,3377.96
2026-02-272,043,099-4.3%195,79610.43
2026-02-132,135,475-0.0%256,0318.34
2026-01-302,135,587-1.6%167,34412.76
2026-01-152,171,494-1.3%205,40810.57
2025-12-312,198,907-20.9%490,9704.48
2025-12-152,781,726+0.5%355,0347.84
2025-11-282,767,123-1.6%350,1167.90
2025-11-142,810,725-1.3%468,6486.00
2025-10-312,847,368+26.6%2,113,4981.35
2025-10-152,248,165+36.9%6,084,5181.00
2025-09-301,641,893+0.0%90,40518.16
2025-09-151,641,280-3.5%66,88824.54
2025-08-291,700,751-4.6%105,51416.12
2025-08-151,782,098-17.0%93,10019.14
2025-07-312,147,256+4.8%127,62516.82
2025-07-152,049,775+1.8%130,70515.68
2025-06-302,014,513-27.9%581,3513.47
2025-06-132,793,266-5.1%325,0388.59
2025-05-302,942,463-2.2%181,37516.22
2025-05-153,008,421-7.6%183,61016.38
2025-04-303,256,620-0.4%177,32318.37
2025-04-153,269,707-11.4%398,1178.21
2025-03-313,689,793-1.9%247,39214.91
2025-03-143,761,654+1.0%630,5835.97
2025-02-283,724,631-6.5%216,31817.22
2025-02-143,984,030-1.6%269,09714.81
2025-01-314,048,269-0.1%210,52819.23
2025-01-154,054,178+2.0%238,49117.00
2024-12-313,973,621-2.4%273,02314.55
2024-12-134,071,061-0.1%362,07411.24
2024-11-294,076,970-12.5%303,75513.42
2024-11-154,661,129+1.0%602,8537.73
2024-10-314,613,842-13.8%2,228,8942.07

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of ANRO volume is 66.8%, up 20.7 points over the last five sessions. Over the last 30 readings it ranged from 42.5% (27 October 2026) to 87.9% (20 October 2026). The latest reading is in line with the 30-session average of 68.8%, on 224K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-11-02150K224K66.8%58
2026-10-30157K210K74.9%0
2026-10-29112K156K71.9%0
2026-10-2880K120K66.2%0
2026-10-2790K211K42.5%0
2026-10-2695K206K46.1%0
2026-10-23125K148K84.3%81
2026-10-22131K237K55.4%61
2026-10-21191K261K73.2%1
2026-10-20270K307K87.9%0
2026-10-19228K292K78.1%0
2026-10-16206K234K87.8%0
2026-10-15159K213K74.8%0
2026-10-14440K845K52.1%0
2026-10-13207K278K74.6%5,896
2026-10-12132K168K78.9%0
2026-10-09181K363K50.0%0
2026-10-08105K151K69.4%0
2026-10-07114K138K82.5%0
2026-10-06183K218K83.9%0
2026-10-05159K183K86.7%0
2026-10-02162K204K79.3%0
2026-10-01120K229K52.2%0
2026-09-30128K174K73.5%0
2026-09-29135K212K63.4%0
2026-09-28137K240K57.0%0
2026-09-2593K117K79.6%0
2026-09-24154K256K60.2%832
2026-09-23123K264K46.6%2,717
2026-09-2283K129K64.2%0

Fails to deliver

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

As of 14 October 2026, the fails-to-deliver balance in ANRO is 48 shares, down 538 shares over the last settlement date. Over the last 30 readings it ranged from 2 shares (22 June 2026) to 27,992 shares (28 July 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-10-1448$22.09$1K
2026-10-02586$25.31$15K
2026-10-01511$25.53$13K
2026-09-15128$31.68$4K
2026-09-14581$32.00$19K
2026-09-08568$35.55$20K
2026-08-243,994$34.28$137K
2026-08-20100$34.89$3K
2026-08-18851$33.60$29K
2026-08-111,630$28.29$46K
2026-08-072,193$28.47$62K
2026-08-061,563$28.03$44K
2026-08-041,053$27.27$29K
2026-07-2827,992$27.87$780K
2026-07-271,152$26.78$31K
2026-07-24947$26.85$25K
2026-07-222,525$27.07$68K
2026-07-207,164$27.54$197K
2026-07-172,054$27.33$56K
2026-07-162,772$27.82$77K
2026-07-083,574$25.70$92K
2026-07-02650$24.94$16K
2026-06-291,523$27.04$41K
2026-06-2636$25.30$911
2026-06-2541$24.91$1K
2026-06-24857$24.44$21K
2026-06-2313,843$22.93$317K
2026-06-222$22.74$45
2026-06-1830$21.79$654
2026-06-172,417$21.00$51K

Insider trades

SEC Form 4, newest first. JSON

Insiders at ANRO reported 3 open-market sells worth $3.6M in the last 90 days and no open-market buys. Latest filing: Smith Nicholas Conrad (PRESIDENT AND CFO) on 2026-10-02.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-10-02Smith Nicholas ConradPRESIDENT AND CFOExercise or conversion55K$2.32$128K79K
2026-09-30Smith Nicholas ConradPRESIDENT AND CFOSell886$26.87$24K24K
2026-09-30Smith Nicholas ConradPRESIDENT AND CFOSell23K$25.78$597K25K
2026-09-30Smith Nicholas ConradPRESIDENT AND CFOExercise or conversion24K$2.35$57K48K
2026-09-29Smith Nicholas ConradPRESIDENT AND CFOSell111K$26.58$2.9M24K
2026-09-29Smith Nicholas ConradPRESIDENT AND CFOExercise or conversion54K$2.35$128K135K
2026-09-29Smith Nicholas ConradPRESIDENT AND CFOExercise or conversion56K$2.35$133K81K
2026-05-14Etkin AmitPRESIDENT AND CEOGift400K$0.00$0834K
2026-03-01Smith Nicholas ConradCHIEF FINANCIAL OFFICER & CBOTax withholding3K$19.69$55K24K
2026-03-01Etkin AmitPRESIDENT AND CEOTax withholding6K$19.69$123K1.2M
2024-07-10Savitz AdamCHIEF MEDICAL OFFICERBuy3K$13.22$39K40K
2024-07-09Savitz AdamCHIEF MEDICAL OFFICERBuy1K$13.15$18K37K
2024-07-09Savitz AdamCHIEF MEDICAL OFFICERBuy11K$12.53$134K36K
2024-03-28Smith Nicholas ConradCHIEF FINANCIAL OFFICERBuy5K$16.56$75K27K
2024-03-28Smith Nicholas ConradCHIEF FINANCIAL OFFICERBuy2K$15.80$25K22K
2024-03-01Etkin AmitPRESIDENT AND CEOGrant35K$0.00$01.2M
2024-03-01Smith Nicholas ConradCHIEF FINANCIAL OFFICERGrant19K$0.00$021K
2024-02-06Chen Po Yu (Jeff)DirectorConversion39Kprice not stated in the filingnot stated39K
2024-02-06Chen Po Yu (Jeff)DirectorConversion8Kprice not stated in the filingnot stated48K
2024-02-06Etkin AmitPRESIDENT AND CEOConversion12Kprice not stated in the filingnot stated1.2M
2024-02-06Etkin AmitPRESIDENT AND CEOBuy3K$16.00$50K1.2M
2024-02-06Savitz AdamCHIEF MEDICAL OFFICERConversion8Kprice not stated in the filingnot stated8K
2024-02-06Savitz AdamCHIEF MEDICAL OFFICERBuy17K$16.00$272K25K
2024-02-06Cox Christopher NixonDirectorConversion589Kprice not stated in the filingnot stated589K
2024-02-06Cox Christopher NixonDirectorConversion127Kprice not stated in the filingnot stated716K
2024-02-06Smith Nicholas ConradCHIEF FINANCIAL OFFICERBuy2K$16.00$25K2K
2024-02-06York GwillDirectorConversion24Kprice not stated in the filingnot stated24K
2024-02-06Alpha Wave Global, LPTenPercentOwnerConversion2.0Mprice not stated in the filingnot stated2.0M
2024-02-06Alpha Wave Global, LPTenPercentOwnerConversion1.1Mprice not stated in the filingnot stated3.1M
2024-02-06Alpha Wave Global, LPTenPercentOwnerBuy600K$16.00$9.6M3.7M
2024-02-06Apeiron Investment Group Ltd.OtherConversion252Kprice not stated in the filingnot stated252K
2024-02-06Apeiron Investment Group Ltd.OtherConversion675Kprice not stated in the filingnot stated675K

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 ANRO worth $3.6M at the prices reported; 1 in the last 90 days worth $3.6M. Latest: NICHOLAS SMITH filed on 2026-09-29 to sell 134,886 shares ($3.6M) from 2026-09-29.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-09-29NICHOLAS SMITHOfficer135K$3.6M0.344%2026-09-29Morgan Stanley Smith Barney LLC Executive Financial Services

Large holders (13D and 13G)

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

14 holders report 5% or more of ANRO in their latest filing, all on Schedule 13G (passive). The largest reported stake is Joseph Edelman at 10.0% of the class (4,176,711 shares), filed 2026-08-14 for an event on 2026-06-30.

FiledFormHolderSharesOf classEvent
2026-10-3013GVanguard Capital Managementinvestment adviser2.0M5.0%2026-09-30
2026-08-1413G/Ano. 2Joseph Edelmanindividual4.2M10.0%2026-06-30
2026-08-1413G/Ano. 2Perceptive Life Sciences Master Fund, Ltd.corporation4.2M10.0%2026-06-30
2026-08-1413G/Ano. 2Perceptive Advisors LLCinvestment adviser4.2M10.0%2026-06-30
2026-08-1413G/Ano. 1Sirenia Capital Management LPinvestment adviser, partnership2.2M6.2%2026-06-30
2026-08-1413G/Ano. 1Alex Silversteinparent holding company, individual2.2M6.2%2026-06-30
2026-08-1413G/Ano. 2Ryan Wilderparent holding company, individual785K2.2%2026-06-30
2026-08-1413G/Ano. 2Vestal Point Capital, LPinvestment adviser, partnership785K2.2%2026-06-30
2026-07-2713GBlackRock, Inc.parent holding company2.1M6.0%2026-06-30
2026-07-2013GOleg Nodelmanparent holding company, individual2.2M5.8%2026-07-13
2026-07-2013GEcoR1 Capital, LLCinvestment adviser, other entity2.2M5.8%2026-07-13
2026-07-2013GEcoR1 Capital Fund Qualified, L.P.partnership2.1M5.3%2026-07-13
2026-05-1513G/Ano. 2Commodore Capital LPinvestment adviser, partnership3.6M9.9%2026-03-31
2026-05-1513G/Ano. 2Michael Kramarzparent holding company, individual3.6M9.9%2026-03-31
2026-05-1513G/Ano. 2Robert Egen Atkinsonparent holding company, individual3.6M9.9%2026-03-31
2026-05-1513G/Ano. 2Commodore Capital Master LPpartnership3.6M9.9%2026-03-31
2026-05-1513G/Ano. 4Steven A. Cohenindividual1.2M3.7%2026-03-31
2026-05-1513G/Ano. 4Point72 Biotech Private Investments, LLCother entity668K2.1%2026-03-31
2026-05-1513G/Ano. 4Differentiated Ventures Investments, LLCother entity668K2.1%2026-03-31
2026-05-1513G/Ano. 472 Investment Holdings, LLCother entity668K2.1%2026-03-31
2026-05-1513G/Ano. 4Point72 Asset Management, L.P.partnership503K1.6%2026-03-31
2026-05-1513G/Ano. 4Point72 Capital Advisors, Inc.corporation503K1.6%2026-03-31
2026-02-1813G/Ano. 3Steven Boydparent holding company, individual1.5M4.9%2025-12-31
2026-02-1813G/Ano. 3Armistice Capital, LLCinvestment adviser, other entity1.5M4.9%2025-12-31
2026-02-1713G/Ano. 1Anup Aroraindividual, parent holding company789K2.4%2025-12-31
2026-02-1713G/Ano. 1Parag Shahindividual, parent holding company789K2.4%2025-12-31
2026-02-1713G/Ano. 1K2 HealthVentures Equity Trust LLCother entity789K2.4%2025-12-31

13F holders

Tracked managers holding ANRO at their latest 13F. JSON

4 of the 30 tracked managers held ANRO at their latest 13F, $33.8M in total at quarter-end prices. Millennium Management is the largest at $14.7M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 0 added shares and 4 cut.

FundQuarterSharesValueOf portfolioChange in shares
Millennium Management2026-06-30558K$14.7M0.01%-264K
Point72 Asset Management2026-06-30503K$13.3M0.01%-137
Two Sigma Investments2026-06-30147K$3.9M0.00%-69K
Renaissance Technologies2026-06-3071K$1.9M0.00%-32K

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

Alto Neuroscience 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 Alto Neuroscience (ANRO), SEC CIK 1999480, listed on NYSE. 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 2026-10-14.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 2026-09-29.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 2026-10-30.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 2026-08-12.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 2026-10-02.JSON and CSV
Company record
EDGAR filing index for CIK 1999480Ticker, 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 ANRO is sold short?
5,204,407 shares were held short at the 2026-10-15 settlement, 7.5 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 ANRO's daily short volume?
On 2026-11-02, 149,861 of the 224,163 ANRO shares reported to FINRA were sold short, 66.8% of the day's reported volume. Short volume is a flow for one day, not a position.
Does ANRO have fails to deliver?
The SEC's latest file shows 48 ANRO shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.
Are ANRO insiders buying or selling?
Insiders at ANRO reported 3 open-market sells worth $3.6M in the last 90 days and no open-market buys. Latest filing: Smith Nicholas Conrad (PRESIDENT AND CFO) on 2026-10-02.
Have ANRO insiders filed to sell?
1 Form 144 notice on file for ANRO worth $3.6M at the prices reported; 1 in the last 90 days worth $3.6M. Latest: NICHOLAS SMITH filed on 2026-09-29 to sell 134,886 shares ($3.6M) from 2026-09-29.
Who owns 5% or more of ANRO?
14 holders report 5% or more of ANRO in their latest filing, all on Schedule 13G (passive). The largest reported stake is Joseph Edelman at 10.0% of the class (4,176,711 shares), filed 2026-08-14 for an event on 2026-06-30.
Which tracked 13F managers own ANRO?
4 of the 30 tracked 13F managers held ANRO shares at their latest filing, $33.8M in all. The largest: Izzy Englander's Millennium Management (558K shares, $14.7M), Steve Cohen's Point72 Asset Management (503K shares, $13.3M), Two Sigma Investments (147K shares, $3.9M), Renaissance Technologies (71K shares, $1.9M).

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