Abivax (ABVX)

Abivax on one page: short interest, daily short volume, fails to deliver, planned sales, large holders and 13F holders. Listed on Nasdaq.

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7.8M

Short interest

settlement 2026-09-30

5.0

Days to cover

-1.1 days vs prior

21.3%

Short share of volume

2026-10-09

Fails to deliver

settlement 2026-09-02

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 ABVX is 7,776,429 shares, up 814,400 shares over the last month. Over the last 48 readings it ranged from 191,899 shares (31 October 2024) to 7,776,429 shares (30 September 2026). The latest reading sits at the top of that range. At the reported average volume of 1.5M shares a day that is 5.0 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	7,776,429	+13.4%	1,540,598	5.05
2026-09-15	6,858,511	-1.5%	1,114,113	6.16
2026-08-31	6,962,029	+16.0%	873,629	7.97
2026-08-14	6,001,787	+15.5%	765,619	7.84
2026-07-31	5,194,797	+29.3%	1,029,141	5.05
2026-07-15	4,018,322	-7.1%	1,705,540	2.36
2026-06-30	4,325,904	-11.5%	2,991,256	1.45
2026-06-15	4,887,145	+60.0%	4,102,529	1.19
2026-05-29	3,053,530	+23.1%	1,212,239	2.52
2026-05-15	2,480,049	-2.6%	833,182	2.98
2026-04-30	2,545,174	-0.6%	809,010	3.15
2026-04-15	2,561,260	-21.6%	841,542	3.04
2026-03-31	3,266,931	-1.5%	1,206,481	2.71
2026-03-13	3,315,979	+1.5%	901,879	3.68
2026-02-27	3,268,303	+3.0%	782,842	4.17
2026-02-13	3,172,758	-13.2%	677,411	4.68
2026-01-30	3,656,705	+18.8%	931,603	3.93
2026-01-15	3,078,950	+5.9%	2,361,227	1.30
2025-12-31	2,908,643	+25.0%	1,741,255	1.67
2025-12-15	2,327,324	+1.4%	1,922,250	1.21
2025-11-28	2,296,266	+28.1%	1,477,009	1.55
2025-11-14	1,792,054	+4.5%	1,103,004	1.62
2025-10-31	1,715,643	+25.8%	1,024,928	1.67
2025-10-15	1,363,331	+9.8%	1,126,043	1.21

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 9 October 2026, the short share of ABVX volume is 21.3%, down 30.2 points over the last five sessions. Over the last 30 readings it ranged from 17.4% (8 October 2026) to 65.0% (28 August 2026). The latest reading sits at the bottom of that range. The latest reading is 17.5 points below the 30-session average of 38.8%, on 430K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-09	91K	430K	21.3%	0
2026-10-08	205K	1.2M	17.4%	303
2026-10-07	144K	720K	20.1%	3,110
2026-10-06	236K	1.0M	22.8%	200
2026-10-05	129K	339K	38.0%	400
2026-10-02	144K	279K	51.5%	900
2026-10-01	217K	522K	41.6%	5,827
2026-09-30	122K	328K	37.2%	0
2026-09-29	211K	564K	37.4%	0
2026-09-28	261K	791K	32.9%	400
2026-09-25	237K	657K	36.0%	900
2026-09-24	285K	767K	37.1%	700
2026-09-23	656K	1.3M	50.1%	0
2026-09-22	419K	1.2M	35.4%	5
2026-09-21	114K	315K	36.1%	0
2026-09-18	157K	343K	45.9%	0
2026-09-17	214K	439K	48.9%	300
2026-09-16	338K	772K	43.8%	100
2026-09-15	329K	906K	36.3%	12,821
2026-09-14	168K	410K	40.9%	606
2026-09-11	181K	465K	38.9%	0
2026-09-10	249K	526K	47.4%	306
2026-09-09	180K	403K	44.6%	2,038
2026-09-08	189K	1.0M	18.9%	100
2026-09-04	115K	244K	47.3%	0
2026-09-03	134K	373K	36.0%	111
2026-09-02	213K	393K	54.2%	0
2026-09-01	136K	438K	31.0%	0
2026-08-31	231K	475K	48.5%	9,546
2026-08-28	338K	520K	65.0%	0

Fails to deliver

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

As of 2 September 2026, the fails-to-deliver balance in ABVX is 3 shares, down 4 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (17 July 2026) to 322,685 shares (1 July 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-09-02	3	$113.67	$341
2026-08-28	7	$114.30	$800
2026-08-24	84	$114.95	$10K
2026-08-21	4,779	$118.20	$565K
2026-08-06	22	$125.39	$3K
2026-07-31	16,041	$124.33	$2.0M
2026-07-29	1,583	$124.23	$197K
2026-07-27	3,441	$125.70	$433K
2026-07-24	8,313	$131.16	$1.1M
2026-07-23	35	$129.73	$5K
2026-07-21	7	$131.50	$921
2026-07-20	20,203	$136.65	$2.8M
2026-07-17	1	$137.77	$138
2026-07-14	54,828	$135.98	$7.5M
2026-07-09	135	$138.54	$19K
2026-07-08	15	$142.17	$2K
2026-07-07	3,363	$143.99	$484K
2026-07-06	190,091	$144.65	$27.5M
2026-07-02	200,005	$132.56	$26.5M
2026-07-01	322,685	$133.26	$43.0M
2026-06-30	12,678	$96.15	$1.2M
2026-06-29	10,665	$97.50	$1.0M
2026-06-22	41,091	$99.15	$4.1M
2026-06-18	8,348	$100.15	$836K
2026-06-15	121	$96.55	$12K
2026-06-11	361	$98.03	$35K
2026-06-09	2,712	$101.53	$275K
2026-06-08	3,345	$101.53	$340K
2026-06-05	15,968	$104.93	$1.7M
2026-06-04	195,258	$90.15	$17.6M

Planned sales (Form 144)

Newest first. JSON

2 Form 144 notices on file for ABVX worth $245.0M at the prices reported; 0 in the last 90 days worth $0. Latest: Sofinnova Crossover I SLP filed on 2026-01-08 to sell 1,000,000 shares ($133.7M) from 2026-01-08.

Filed	Seller	Shares	Market value	Of outstanding	Sale from	Broker
2026-01-08	Sofinnova Crossover I SLPAffiliate	1.0M	$133.7M	1.285%	2026-01-08	Leerink Partners
2025-10-28	Sofinnova Crossover I SLPAffiliate	1.2M	$111.3M	1.542%	2025-10-28	Leerink Partners

Large holders (13D and 13G)

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

8 holders report 5% or more of ABVX in their latest filing, all on Schedule 13G (passive). The largest reported stake is Chen Yu at 7.0% of the class (6,007,834 shares), filed 2026-08-14 for an event on 2026-06-30.

Filed	Form	Holder	Shares	Of class	Event
2026-08-14	13G/Ano. 2	Chen Yuindividual	6.0M	7.0%	2026-06-30
2026-08-14	13G/Ano. 2	TCG Crossover GP I, LLCother entity	4.9M	5.7%	2026-06-30
2026-08-14	13G/Ano. 2	TCG Crossover Fund I, L.P.partnership	4.9M	5.7%	2026-06-30
2026-08-14	13G/Ano. 2	TCG Crossover GP II, LLCother entity	1.1M	1.3%	2026-06-30
2026-08-14	13G/Ano. 2	TCG Crossover Fund II, L.P.partnership	1.1M	1.3%	2026-06-30
2026-08-13	13G/Ano. 2	Raymond Debbaneindividual	4.8M	6.0%	2026-06-30
2026-08-13	13G/Ano. 2	Invus Public Equities, L.P.partnership	4.8M	6.0%	2026-06-30
2026-08-13	13G/Ano. 2	Invus Public Equities Advisors, LLCother entity	4.8M	6.0%	2026-06-30
2026-08-13	13G/Ano. 2	Invus Global Management, LLCother entity	4.8M	6.0%	2026-06-30
2026-08-13	13G/Ano. 2	Siren, L.L.C.other entity	4.8M	6.0%	2026-06-30
2026-08-13	13G/Ano. 2	Avicenna Life Sci Master GP LLCother entity	36K	0.0%	2026-06-30
2026-08-13	13G/Ano. 2	Ulys, L.L.C.other entity	36K	0.0%	2026-06-30
2026-08-13	13G/Ano. 2	Avicenna Life Sci Master Fund LPpartnership	36K	0.0%	2026-06-30
2026-07-06	13D/Ano. 6	Cedric Moreauindividual	3.5M	4.3%	2026-07-02
2026-07-06	13D/Ano. 6	Jacques Theurillatindividual	3.5M	4.3%	2026-07-02
2026-07-06	13D/Ano. 6	Joseph Andersonindividual	3.5M	4.3%	2026-07-02
2026-07-06	13D/Ano. 6	Kinam Hongindividual	3.5M	4.3%	2026-07-02
2026-07-06	13D/Ano. 6	Antoine Papiernikindividual	3.5M	4.3%	2026-07-02
2026-07-06	13D/Ano. 6	Sofinnova Partners SASother entity	3.5M	4.3%	2026-07-02
2026-07-06	13D/Ano. 6	Sofinnova Crossover I SLPother entity	3.5M	4.3%	2026-07-02
2025-11-14	13G/Ano. 2	VHCP Co-Investment Holdings III, LLCother entity	577K	0.8%	2025-09-30
2025-11-14	13G/Ano. 2	Venrock Healthcare Capital Partners III, L.P.partnership	577K	0.8%	2025-09-30
2025-11-14	13G/Ano. 2	Venrock Healthcare Capital Partners EG, L.P.partnership	577K	0.8%	2025-09-30
2025-11-14	13G/Ano. 2	VHCP Management III, LLCother entity	577K	0.8%	2025-09-30
2025-11-14	13G/Ano. 2	VHCP Management EG, LLCother entity	577K	0.8%	2025-09-30
2025-11-14	13G/Ano. 2	Nimish Shahindividual	577K	0.8%	2025-09-30
2025-11-14	13G/Ano. 2	Bong Y. Kohindividual	577K	0.8%	2025-09-30

13F holders

Tracked managers holding ABVX at their latest 13F. JSON

4 of the 30 tracked managers held ABVX at their latest 13F, $235.5M in total at quarter-end prices. Citadel Advisors is the largest at $191.7M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 2 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Citadel Advisors	2026-06-30	1.4M	$191.7M	0.02%	+894K
Millennium Management	2026-06-30	234K	$31.1M	0.01%	-372K
D. E. Shaw & Co.	2026-06-30	90K	$12.0M	0.01%	+40K
Point72 Asset Management	2026-06-30	5K	$670K	0.00%	-633K

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

Abivax 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 Abivax (ABVX), SEC CIK 1956827, 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 2026-09-30.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 2026-09-02.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 2026-01-08.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 1956827Ticker, 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 ABVX is sold short?

7,776,429 shares were held short at the 2026-09-30 settlement, 5.0 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 ABVX's daily short volume?

On 2026-10-09, 91,371 of the 429,510 ABVX shares reported to FINRA were sold short, 21.3% of the day's reported volume. Short volume is a flow for one day, not a position.

Does ABVX have fails to deliver?

The SEC's latest file shows 3 ABVX shares failed to deliver at settlement 2026-09-02. Fails are reported per settlement date and published twice a month with a lag.

Are ABVX insiders buying or selling?

No Form 4 filings for ABVX are on record.

Have ABVX insiders filed to sell?

Who owns 5% or more of ABVX?

Which tracked 13F managers own ABVX?

4 of the 30 tracked 13F managers held ABVX shares at their latest filing, $235.5M in all. The largest: Ken Griffin's Citadel Advisors (1.4M shares, $191.7M), Izzy Englander's Millennium Management (234K shares, $31.1M), D. E. Shaw & Co. (90K shares, $12.0M), Steve Cohen's Point72 Asset Management (5K shares, $670K).

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

Abivax (ABVX)

Short interest

Daily short volume

Fails to deliver

Planned sales (Form 144)

Large holders (13D and 13G)

13F holders

Abivax in the regulatory record

Source and updates

How to read it

Other company pages

Datasets

Frequently Asked Questions