XOOMAR

Artiva Biotherapeutics, Inc. (ARTV)

Every FINRA and SEC series the site collects for Artiva Biotherapeutics, Inc.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances).

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2.1M

Short interest

settlement 2026-08-14

6.1

Days to cover

+9.1% vs prior

63.4%

Short share of volume

2026-09-11

279

Fails to deliver

settlement 2026-08-14

$5.3M

Insider flow, 90 days

14 buys, 7 sells

As of 2026-09-11.

Short interest

FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSON

As of 14 August 2026, short interest in ARTV is 2,095,813 shares, up 371,739 shares over the last month. Over the last 48 readings it ranged from 51,325 shares (30 August 2024) to 2,095,813 shares (14 August 2026). The latest reading sits at the top of that range. At the reported average volume of 346K shares a day that is 6.1 days to cover, elevated.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-142,095,813+9.1%345,5146.07
2026-07-311,921,843+11.5%374,4745.13
2026-07-151,724,074+28.7%457,8953.77
2026-06-301,339,927+24.1%734,6331.82
2026-06-151,079,519+5.3%660,7431.63
2026-05-291,025,413+113.4%518,6681.98
2026-05-15480,579+109.1%777,7691.00
2026-04-30229,817+54.8%435,2731.00
2026-04-15148,487+0.2%261,0371.00
2026-03-31148,199+0.7%125,7511.18
2026-03-13147,133-1.1%245,1351.00
2026-02-27148,835-21.3%129,7931.15
2026-02-13189,121-7.2%138,3451.37
2026-01-30203,792-28.5%200,6191.02
2026-01-15284,944-27.1%239,6381.19
2025-12-31391,100+119.5%597,3711.00
2025-12-15178,188+11.1%4,441,5771.00
2025-11-28160,433-27.5%119,7401.34
2025-11-14221,279-13.9%262,3041.00
2025-10-31256,977+26.1%10,850,2451.00
2025-10-15203,790-10.5%29,9066.81
2025-09-30227,734-21.7%136,0281.67
2025-09-15290,934-4.6%85,6373.40
2025-08-29305,010+0.2%63,5614.80

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of ARTV volume is 63.4%, down 22.9 points over the last five sessions. Over the last 52 readings it ranged from 46.8% (6 August 2026) to 87.8% (8 July 2026). The latest reading is 2.4 points below the 30-session average of 65.8%, on 98K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-1162K98K63.4%0
2026-09-10103K157K65.8%0
2026-09-0988K121K73.1%0
2026-09-0847K79K59.4%0
2026-09-0452K89K58.8%0
2026-09-03155K180K86.3%81,745
2026-09-0278K113K69.5%0
2026-09-0162K105K58.9%0
2026-08-3160K83K71.9%0
2026-08-2850K83K60.3%0
2026-08-2744K64K68.7%0
2026-08-2642K78K54.4%0
2026-08-2547K99K47.5%0
2026-08-2478K131K59.3%0
2026-08-2153K73K72.9%0
2026-08-2067K122K55.3%0
2026-08-19157K234K67.2%74,262
2026-08-1867K108K62.1%0
2026-08-1787K113K77.5%29,888
2026-08-1464K96K67.2%0
2026-08-1358K93K62.6%355
2026-08-1269K112K61.9%50
2026-08-11136K190K71.8%0
2026-08-1047K66K71.4%0
2026-08-0762K108K57.2%0
2026-08-0670K150K46.8%1,258
2026-08-05173K245K70.5%0
2026-08-04134K172K77.7%0
2026-08-03209K260K80.5%0
2026-07-31117K161K72.8%1,900

Fails to deliver

SEC, by settlement date. JSON

As of 14 August 2026, the fails-to-deliver balance in ARTV is 279 shares, up 268 shares over the last settlement date. Over the last 52 readings it ranged from 7 shares (15 June 2026) to 324,879 shares (11 June 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-14279$11.30$3K
2026-08-1011$11.27$124
2026-08-061,245$11.59$14K
2026-08-0468$10.76$732
2026-08-036,261$10.10$63K
2026-07-291,059$10.53$11K
2026-07-24291$10.13$3K
2026-07-2312,926$10.02$130K
2026-07-226,927$10.00$69K
2026-07-214,083$9.15$37K
2026-07-20178$9.76$2K
2026-07-172,303$9.04$21K
2026-07-15209$9.35$2K
2026-07-144,473$8.93$40K
2026-07-134,933$9.64$48K
2026-07-108$9.41$75
2026-07-06880$9.61$8K
2026-06-175,781$8.91$52K
2026-06-157$8.54$60
2026-06-11324,879$7.42$2.4M
2026-06-10305,476$7.27$2.2M
2026-04-232,182$11.73$26K
2026-04-222,920$12.54$37K
2026-04-211,856$13.39$25K
2026-04-2016,279$12.55$204K
2026-04-1612,269$9.10$112K
2026-04-131,853$6.81$13K
2026-04-071,372$7.29$10K
2026-04-067,126$6.74$48K
2026-04-027,135$6.75$48K

Insider trades

SEC Form 4, newest first, 50 of 73 shown. JSON

Over the last 90 days ARTV insiders reported 14 open-market buys ($6.6M) against 7 sells ($1.3M), so the dollar flow leans toward buying. Latest filing: Miralles Gines Diego (President &amp; Head of R&amp;D) on 2026-09-09.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-09Miralles Gines DiegoPresident &amp; Head of R&amp;DGrant45K$0.00$0123K
2026-09-09Horan ChristopherChief Tech Operations OfficerGrant40K$0.00$0323K
2026-09-09Bush JenniferCOO, CLO, Compliance OfficerGrant45K$0.00$0375K
2026-09-09Banerjee SubhashisChief Medical OfficerGrant30K$0.00$0171K
2026-09-08Aslan FredChief Executive OfficerSell23K$10.92$256K1.4M
2026-09-03Horan ChristopherChief Tech Operations OfficerSell10K$11.16$116K283K
2026-09-03Bush JenniferCOO, CLO, Compliance OfficerSell8K$11.16$94K330K
2026-09-03Banerjee SubhashisChief Medical OfficerSell1K$11.16$12K141K
2026-09-03Aslan FredChief Executive OfficerSell62K$11.16$690K1.5M
2026-08-27Banerjee SubhashisChief Medical OfficerSell8K$12.01$99K142K
2026-08-27Banerjee SubhashisChief Medical OfficerOption exercise5K$1.92$10K150K
2026-08-18Banerjee SubhashisChief Medical OfficerSell429$12.00$5K145K
2026-08-18Banerjee SubhashisChief Medical OfficerOption exercise429$1.92$824145K
2026-07-31RA CAPITAL MANAGEMENT, L.P.n/aBuy25K$9.93$248K17.3M
2026-07-29RA CAPITAL MANAGEMENT, L.P.n/aBuy21K$9.99$208K17.3M
2026-07-24RA CAPITAL MANAGEMENT, L.P.n/aBuy41K$9.99$413K17.3M
2026-07-23RA CAPITAL MANAGEMENT, L.P.n/aBuy60K$9.96$596K17.2M
2026-07-22RA CAPITAL MANAGEMENT, L.P.n/aBuy84K$9.93$835K17.2M
2026-07-21RA CAPITAL MANAGEMENT, L.P.n/aBuy121K$9.55$1.2M17.1M
2026-07-17RA CAPITAL MANAGEMENT, L.P.n/aBuy8K$8.95$71K17.0M
2026-07-16RA CAPITAL MANAGEMENT, L.P.n/aBuy152K$8.93$1.4M17.0M
2026-07-13RA CAPITAL MANAGEMENT, L.P.n/aBuy7K$8.94$59K16.8M
2026-07-10RA CAPITAL MANAGEMENT, L.P.n/aBuy15K$8.97$135K16.8M
2026-06-26RA CAPITAL MANAGEMENT, L.P.n/aBuy2K$8.98$17K16.8M
2026-06-25RA CAPITAL MANAGEMENT, L.P.n/aBuy31K$8.88$275K16.8M
2026-06-16RA CAPITAL MANAGEMENT, L.P.n/aBuy125K$8.89$1.1M16.8M
2026-06-15RA CAPITAL MANAGEMENT, L.P.n/aBuy15K$8.99$139K16.6M
2026-06-12RA CAPITAL MANAGEMENT, L.P.n/aBuy391K$8.57$3.4M16.6M
2026-06-11RA CAPITAL MANAGEMENT, L.P.n/aBuy549K$7.91$4.3M16.2M
2026-06-10RA CAPITAL MANAGEMENT, L.P.n/aBuy103$7.00$72115.7M
2026-06-09RA CAPITAL MANAGEMENT, L.P.n/aBuy479K$6.91$3.3M15.7M
2026-05-19Raymon HeatherSVP, Research and DevelopmentSell3K$9.01$28K148K
2026-05-19Horan ChristopherChief Tech Operations OfficerSell7K$9.01$63K293K
2026-05-19Bush JenniferCOO, CLO, Compliance OfficerSell9K$9.01$79K338K
2026-05-19Banerjee SubhashisChief Medical OfficerSell7K$9.01$63K145K
2026-05-19Aslan FredChief Executive OfficerSell27K$9.01$244K1.5M
2026-05-18Miralles Gines DiegoPresident &amp; Head of R&amp;DGrant78K$0.00$078K
2026-05-11RA CAPITAL MANAGEMENT, L.P.n/aBuy6.5M$11.52$75.0M15.2M
2026-05-11GC Corp.n/aBuy347K$11.52$4.0M1.6M
2026-05-11GC Corp.n/aBuy1.1M$11.52$12.5M4.4M
2026-03-10Huston Thad AllenChief Financial OfficerGrant220K$0.00$0220K
2026-02-15Raymon HeatherSVP, Research and DevelopmentTax withholding2K$4.00$6K151K
2026-02-15Raymon HeatherSVP, Research and DevelopmentGrant46K$0.00$0153K
2026-02-15Horan ChristopherChief Tech Operations OfficerTax withholding2K$4.00$9K300K
2026-02-15Horan ChristopherChief Tech Operations OfficerGrant117K$0.00$0303K
2026-02-15Bush JenniferCOO, CLO, Secy, Compliance OffTax withholding4K$4.00$14K347K
2026-02-15Bush JenniferCOO, CLO, Secy, Compliance OffGrant117K$0.00$0350K
2026-02-15Banerjee SubhashisChief Medical OfficerGrant102K$0.00$0152K
2026-02-15Aslan FredPresident and CEOTax withholding15K$4.00$58K1.6M
2026-02-15Aslan FredPresident and CEOGrant367K$0.00$01.6M

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 the rarer, stronger signal.

Planned sales (Form 144)

Newest first. JSON

3 Form 144 notices on file for ARTV worth $364K at the prices reported; 3 in the last 90 days worth $364K. Latest: FRED ASLAN filed on 2026-09-08 to sell 23,429 shares ($262K) from 2026-09-08.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-09-08FRED ASLANDirector, Officer23K$262K0.048%2026-09-08Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-27SUBHASHIS BANERJEEOfficer8K$92K0.016%2026-08-27Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-18SUBHASHIS BANERJEEOfficer833$10K0.002%2026-08-18Morgan Stanley Smith Barney LLC Executive Financial Services

Large holders (13D and 13G)

One row per reporting person, newest filing first. JSON

4 holders above 5% have filed on ARTV, 4 on Schedule 13D (active intent). The largest reported stake is RA Capital Management, L.P. at 37.9% of the class (18,415,956 shares), filed 2026-07-23 for an event on 2026-07-22.

FiledFormHolderSharesOf classEvent
2026-07-2313D/Ano. 4RA Capital Management, L.P.investment adviser, partnership18.4M37.9%2026-07-22
2026-07-2313D/Ano. 4Peter Kolchinskyparent holding company, individual18.4M37.9%2026-07-22
2026-07-2313D/Ano. 4Rajeev Shahparent holding company, individual18.4M37.9%2026-07-22
2026-07-2313D/Ano. 4RA Capital Healthcare Fund, L.P.partnership17.2M35.5%2026-07-22

13F holders

Tracked managers holding ARTV at their latest 13F. JSON

4 of the 30 tracked managers held ARTV at their latest 13F, $33.4M in total at quarter-end prices. Viking Global Investors is the largest at $25.3M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 1 cut.

FundQuarterSharesValueOf portfolioChange in shares
Viking Global Investors2026-06-302.6M$25.3M0.07%new or n/a
Citadel Advisors2026-06-30609K$5.9M0.00%+594K
Renaissance Technologies2026-06-30151K$1.5M0.00%+71K
Two Sigma Investments2026-06-3079K$762K0.00%-36K

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

Artiva Biotherapeutics, Inc. 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 pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, 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 summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.

This page follows Artiva Biotherapeutics, Inc. (ARTV), SEC CIK 1817241, 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 method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-14.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-14.JSON and CSV
Planned sales
SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-09-08.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2026-07-23.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-09.JSON and CSV
Company record
EDGAR filing index for CIK 1817241Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
30 requests a minute without a key, 120 a minute with a key from a free account.

Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 13 Sep 05:40 UTC.

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 crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short 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)

Datasets

Frequently Asked Questions

How much of ARTV is sold short?
2,095,813 shares were held short at the 2026-08-14 settlement, 6.1 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 ARTV's daily short volume?
On 2026-09-11, 61,925 of the 97,711 ARTV shares reported to FINRA were sold short, 63.4% of the day's reported volume. Short volume is a flow for one day, not a position.
Does ARTV have fails to deliver?
The SEC's latest file shows 279 ARTV shares failed to deliver at settlement 2026-08-14. Fails are reported per settlement date and published twice a month with a lag.
Are ARTV insiders buying or selling?
Over the last 90 days ARTV insiders reported 14 open-market buys ($6.6M) against 7 sells ($1.3M), so the dollar flow leans toward buying. Latest filing: Miralles Gines Diego (President &amp; Head of R&amp;D) on 2026-09-09.
Have ARTV insiders filed to sell?
3 Form 144 notices on file for ARTV worth $364K at the prices reported; 3 in the last 90 days worth $364K. Latest: FRED ASLAN filed on 2026-09-08 to sell 23,429 shares ($262K) from 2026-09-08.
Who owns more than 5% of ARTV?
4 holders above 5% have filed on ARTV, 4 on Schedule 13D (active intent). The largest reported stake is RA Capital Management, L.P. at 37.9% of the class (18,415,956 shares), filed 2026-07-23 for an event on 2026-07-22.
Which funds hold ARTV?
4 of the 30 tracked managers held ARTV at their latest 13F, $33.4M in total at quarter-end prices. Viking Global Investors is the largest at $25.3M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 1 cut.

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