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argenx (ARGX)

argenx on one page: short interest, daily short volume, fails to deliver, large holders and 13F holders. Listed on Nasdaq, classified by the SEC as biological products, (no diagnostic substances).

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1.4M

Short interest

settlement 2026-09-30

4.9

Days to cover

-1.4 days vs prior

56.2%

Short share of volume

2026-10-09

21

Fails to deliver

settlement 2026-09-10

As of 2026-10-09.

Short interest

FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSON

As of 30 September 2026, short interest in ARGX is 1,352,184 shares, up 92,835 shares over the last month. Over the last 48 readings it ranged from 1,202,082 shares (14 August 2026) to 2,398,468 shares (15 May 2025). At the reported average volume of 273K shares a day that is 4.9 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-09-301,352,184+3.0%273,4674.94
2026-09-151,313,174+4.3%208,0446.31
2026-08-311,259,349+4.8%319,5713.94
2026-08-141,202,082-9.9%276,4594.35
2026-07-311,334,571-13.3%283,0774.71
2026-07-151,539,375+6.1%302,8695.08
2026-06-301,450,472-1.1%420,9713.45
2026-06-151,466,999-18.8%375,5383.91
2026-05-291,807,173-16.0%262,3786.89
2026-05-152,150,508+3.5%345,9456.22
2026-04-302,077,333-9.0%288,8057.19
2026-04-152,283,168+2.4%310,9027.34
2026-03-312,230,300+18.0%330,0356.76
2026-03-131,889,528+4.5%372,1665.08
2026-02-271,807,892-0.3%336,1975.38
2026-02-131,813,044-0.1%373,7134.85
2026-01-301,815,566+6.2%376,9574.82
2026-01-151,710,171-1.1%442,1803.87
2025-12-311,729,058-7.8%217,0847.96
2025-12-151,875,908+0.9%350,6615.35
2025-11-281,859,506+0.8%336,8415.52
2025-11-141,844,619+8.7%310,8765.93
2025-10-311,696,679-8.8%433,7313.91
2025-10-151,861,291+11.5%325,2165.72

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 9 October 2026, the short share of ARGX volume is 56.2%, up 13.8 points over the last five sessions. Over the last 30 readings it ranged from 30.8% (8 October 2026) to 62.9% (31 August 2026). The latest reading is 5.5 points above the 30-session average of 50.7%, on 233K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-10-09131K233K56.2%4,352
2026-10-08419K1.4M30.8%9,070
2026-10-0750K122K41.2%0
2026-10-06147K262K56.2%0
2026-10-0555K140K39.5%20
2026-10-0274K174K42.4%1
2026-10-0161K118K51.5%0
2026-09-3057K90K62.8%1
2026-09-2970K141K49.4%480
2026-09-2871K136K52.1%59
2026-09-2570K146K48.1%0
2026-09-2483K141K58.8%18
2026-09-2369K217K31.6%2
2026-09-2236K113K31.9%0
2026-09-2160K118K51.2%0
2026-09-1848K96K49.7%0
2026-09-1768K132K51.9%22
2026-09-1655K101K55.0%0
2026-09-1544K111K39.5%0
2026-09-1452K95K55.0%1,847
2026-09-1138K69K54.6%65
2026-09-1051K99K51.8%0
2026-09-0949K85K56.9%0
2026-09-0851K90K56.8%80
2026-09-0428K48K58.5%0
2026-09-0337K62K58.9%0
2026-09-0260K104K57.9%0
2026-09-0132K63K50.5%0
2026-08-3147K74K62.9%151
2026-08-2842K73K58.0%60

Fails to deliver

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

As of 10 September 2026, the fails-to-deliver balance in ARGX is 21 shares, down 2,225 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (4 June 2026) to 19,757 shares (19 August 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-09-1021$1002.31$21K
2026-09-092,246$1007.07$2.3M
2026-09-0210,582$1028.51$10.9M
2026-08-274$1047.10$4K
2026-08-2690$1019.49$92K
2026-08-244,900$1039.78$5.1M
2026-08-1919,757$992.99$19.6M
2026-08-181,699$987.84$1.7M
2026-08-1443$856.94$37K
2026-08-06190$867.94$165K
2026-08-05224$844.50$189K
2026-07-1015$909.49$14K
2026-07-02103$909.50$94K
2026-06-309$912.46$8K
2026-06-26157$888.65$140K
2026-06-2214$877.72$12K
2026-06-1827$892.26$24K
2026-06-163,817$884.20$3.4M
2026-06-15622$893.52$556K
2026-06-12247$898.94$222K
2026-06-081$891.32$891
2026-06-041$813.14$813
2026-05-27629$808.43$509K
2026-05-26761$806.46$614K
2026-05-20127$797.77$101K
2026-04-2014,930$849.04$12.7M
2026-04-0121$730.25$15K
2026-03-314$704.31$3K
2026-03-2544$677.50$30K
2026-03-2315$663.93$10K

Large holders (13D and 13G)

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

2 holders report 5% or more of ARGX in their latest filing, all on Schedule 13G (passive). The largest reported stake is FMR LLC at 8.7% of the class (5,409,597 shares), filed 2026-05-06 for an event on 2026-03-31.

FiledFormHolderSharesOf classEvent
2026-08-1413G/Ano. 11T. Rowe Price Associates, Inc.investment adviser2.7M4.3%2026-06-30
2026-05-0613G/Ano. 12FMR LLCparent holding company5.4M8.7%2026-03-31
2026-05-0613G/Ano. 12Abigail P. Johnsonindividual5.4M8.7%2026-03-31

13F holders

Tracked managers holding ARGX at their latest 13F. JSON

8 of the 30 tracked managers held ARGX at their latest 13F, $513.7M in total at quarter-end prices. Citadel Advisors is the largest at $197.1M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 6 added shares and 2 cut.

FundQuarterSharesValueOf portfolioChange in shares
Citadel Advisors2026-06-30212K$197.1M0.02%-7K
Two Sigma Investments2026-06-30186K$172.2M0.12%+77K
Millennium Management2026-06-3094K$87.6M0.03%+22K
Point72 Asset Management2026-06-3040K$37.1M0.04%new
AQR Capital Management2026-06-3011K$9.9M0.00%+8K
D. E. Shaw & Co.2026-06-308K$7.7M0.00%-44K
Bridgewater Associates2026-06-302K$1.8M0.01%+744
Fisher Asset Management2026-06-30318$296K0.00%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

argenx 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 argenx (ARGX), SEC CIK 1697862, 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 2026-09-30.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-10.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
Company record
EDGAR filing index for CIK 1697862Ticker, 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)

Datasets

Frequently Asked Questions

How much of ARGX is sold short?
1,352,184 shares were held short at the 2026-09-30 settlement, 4.9 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 ARGX's daily short volume?
On 2026-10-09, 131,268 of the 233,493 ARGX shares reported to FINRA were sold short, 56.2% of the day's reported volume. Short volume is a flow for one day, not a position.
Does ARGX have fails to deliver?
The SEC's latest file shows 21 ARGX shares failed to deliver at settlement 2026-09-10. Fails are reported per settlement date and published twice a month with a lag.
Are ARGX insiders buying or selling?
No Form 4 filings for ARGX are on record.
Who owns 5% or more of ARGX?
2 holders report 5% or more of ARGX in their latest filing, all on Schedule 13G (passive). The largest reported stake is FMR LLC at 8.7% of the class (5,409,597 shares), filed 2026-05-06 for an event on 2026-03-31.
Which tracked 13F managers own ARGX?
8 of the 30 tracked 13F managers held ARGX shares at their latest filing, $513.7M in all. The largest: Ken Griffin's Citadel Advisors (212K shares, $197.1M), Two Sigma Investments (186K shares, $172.2M), Izzy Englander's Millennium Management (94K shares, $87.6M), Steve Cohen's Point72 Asset Management (40K shares, $37.1M), Cliff Asness's AQR Capital Management (11K shares, $9.9M), D. E. Shaw & Co. (8K shares, $7.7M). The table above lists all 8.

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