ASE Technology Holding (ASX)

ASE Technology Holding on one page: short interest, daily short volume, fails to deliver, 13F holders and insider trades. Listed on NYSE, classified by the SEC as semiconductors & related devices.

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11.2M

Short interest

settlement 2026-09-30

1.6

Days to cover

-0.6 days vs prior

54.7%

Short share of volume

2026-10-09

1,413

Fails to deliver

settlement 2026-09-04

-$4.1M

Insider flow, 90 days

0 buys, 2 sells

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 ASX is 11,162,480 shares, up 1,011,679 shares over the last month. Over the last 48 readings it ranged from 4,127,656 shares (13 March 2026) to 18,168,448 shares (30 June 2026). At the reported average volume of 7.2M shares a day that is 1.6 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	11,162,480	-18.5%	7,204,707	1.55
2026-09-15	13,699,782	+35.0%	6,394,285	2.14
2026-08-31	10,150,801	+16.1%	6,427,234	1.58
2026-08-14	8,739,586	-21.5%	7,262,693	1.20
2026-07-31	11,134,084	+16.8%	9,789,356	1.14
2026-07-15	9,531,995	-47.5%	11,656,407	1.00
2026-06-30	18,168,448	+82.0%	13,273,172	1.37
2026-06-15	9,979,962	+9.3%	12,503,181	1.00
2026-05-29	9,129,449	-43.4%	10,173,062	1.00
2026-05-15	16,115,984	+99.5%	7,898,828	2.04
2026-04-30	8,078,645	+42.5%	7,891,626	1.02
2026-04-15	5,671,154	+18.2%	6,064,222	1.00
2026-03-31	4,796,241	+16.2%	6,916,152	1.00
2026-03-13	4,127,656	-19.8%	8,086,608	1.00
2026-02-27	5,143,852	-10.1%	6,907,033	1.00
2026-02-13	5,719,228	+3.5%	11,224,262	1.00
2026-01-30	5,528,202	-27.4%	8,355,874	1.00
2026-01-15	7,615,769	-12.4%	7,154,595	1.06
2025-12-31	8,695,212	+23.2%	5,713,605	1.52
2025-12-15	7,055,543	-12.5%	6,201,654	1.14
2025-11-28	8,065,994	+10.2%	6,978,928	1.16
2025-11-14	7,322,191	-17.1%	8,630,637	1.00
2025-10-31	8,830,095	-14.8%	9,622,348	1.00
2025-10-15	10,364,219	-5.0%	7,713,226	1.34

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 9 October 2026, the short share of ASX volume is 54.7%, down 10.5 points over the last five sessions. Over the last 30 readings it ranged from 37.5% (1 October 2026) to 73.7% (10 September 2026). The latest reading is in line with the 30-session average of 56.1%, on 1.7M shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-09	908K	1.7M	54.7%	4,632
2026-10-08	1.1M	2.1M	49.8%	2,083
2026-10-07	638K	1.2M	54.8%	2,841
2026-10-06	682K	1.3M	53.7%	10,105
2026-10-05	923K	1.6M	59.4%	395
2026-10-02	1.8M	2.7M	65.2%	2,806
2026-10-01	579K	1.5M	37.5%	949
2026-09-30	1.1M	2.0M	53.8%	751
2026-09-29	1.7M	2.6M	63.6%	445
2026-09-28	1.0M	2.1M	50.0%	1,121
2026-09-25	689K	1.3M	53.8%	4,336
2026-09-24	769K	1.3M	57.6%	208
2026-09-23	928K	1.6M	58.0%	933
2026-09-22	804K	1.4M	59.3%	3,323
2026-09-21	1.1M	1.9M	57.4%	394
2026-09-18	1.3M	1.8M	68.9%	20
2026-09-17	1.1M	1.6M	66.1%	339
2026-09-16	741K	1.4M	52.6%	603
2026-09-15	476K	1000K	47.6%	120
2026-09-14	1.1M	1.8M	59.7%	338
2026-09-11	784K	1.3M	61.4%	750
2026-09-10	1.2M	1.6M	73.7%	1,309
2026-09-09	1.0M	1.6M	64.3%	610
2026-09-08	1.4M	2.3M	62.2%	643
2026-09-04	763K	1.5M	50.2%	419
2026-09-03	687K	1.7M	41.1%	2,862
2026-09-02	416K	938K	44.3%	1,836
2026-09-01	863K	1.9M	45.6%	433
2026-08-31	621K	1.3M	47.6%	821
2026-08-28	1.0M	1.5M	70.1%	2,417

Fails to deliver

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

As of 4 September 2026, the fails-to-deliver balance in ASX is 1,413 shares, down 79,967 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (27 August 2026) to 196,160 shares (30 June 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-09-04	1,413	$37.43	$53K
2026-09-03	81,380	$37.08	$3.0M
2026-09-02	6,280	$37.43	$235K
2026-09-01	10	$36.95	$370
2026-08-27	1	$37.26	$37
2026-08-25	3	$36.24	$109
2026-08-20	4	$35.66	$143
2026-08-17	7	$39.54	$277
2026-08-13	104	$39.28	$4K
2026-08-10	19,553	$37.39	$731K
2026-08-07	324	$37.25	$12K
2026-08-03	19	$35.17	$668
2026-07-31	4,104	$34.77	$143K
2026-07-28	2,566	$36.55	$94K
2026-07-27	46,508	$36.84	$1.7M
2026-07-23	18	$40.49	$729
2026-07-22	179	$40.01	$7K
2026-07-21	4,171	$36.90	$154K
2026-07-20	8,246	$38.41	$317K
2026-07-17	5,577	$39.51	$220K
2026-07-16	4,009	$40.72	$163K
2026-07-09	68,481	$39.93	$2.7M
2026-07-08	47,836	$39.65	$1.9M
2026-07-06	105,036	$41.87	$4.4M
2026-07-01	3,826	$45.12	$173K
2026-06-30	196,160	$42.13	$8.3M
2026-06-29	65,533	$40.21	$2.6M
2026-06-26	155,057	$41.85	$6.5M
2026-06-23	1,335	$43.62	$58K
2026-06-17	1,121	$36.84	$41K

Insider trades

SEC Form 4, newest first, 50 of 61 shown. JSON

Insiders at ASX reported 2 open-market sells worth $4.1M in the last 90 days and no open-market buys. Latest filing: Chang Hung Pen (Director) on 2026-09-22.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-09-22	Chang Hung Pen	Director	Option exercise	300K	$98.60	$29.6M	4.8M
2026-09-07	Chen Jeffrey	Director	Gift	600K	$0.00	$0	600K
2026-09-07	Tsai Chi-Wen	Chairman & President, SPIL	Grant	334K	$0.00	$0	15.6M
2026-09-07	Chung Chih-Hsiao	GM, ASE Japan & Wuxi Tongzhi	Grant	30K	$0.00	$0	425K
2026-09-07	Hsiang Kenneth	CEO, ISE Labs	Grant	40K	$0.00	$0	109K
2026-09-07	Lin Chung	GM, ASE Shanghai & Electronics	Grant	30K	$0.00	$0	170K
2026-09-07	Lo Raymond	GM TW & Kaohsiung Pkg Facility	Grant	400K	$0.00	$0	4.4M
2026-09-07	Kuo Hung-Ming	Principal Accounting Officer	Grant	50K	$0.00	$0	986K
2026-09-07	Uang Du-Tsuen	Chief Administration Officer	Grant	90K	$0.00	$0	841K
2026-09-07	Tung Hung-Szu	Chief Financial Officer	Grant	400K	$0.00	$0	4.2M
2026-09-07	Tang Andrew R	Director	Grant	85K	$0.00	$0	310K
2026-09-07	Chen Tien-Szu	GM, ASE Inc. Chung-Li Branch	Grant	300K	$0.00	$0	2.6M
2026-09-07	Wu Tien-Yue	Director	Grant	600K	$0.00	$0	8.3M
2026-09-07	Chen Jeffrey	Director	Gift	600K	$0.00	$0	2.1M
2026-09-07	Chen Jeffrey	Director	Grant	300K	$0.00	$0	2.7M
2026-08-13	Chung Chih-Hsiao	GM, ASE Japan & Wuxi Tongzhi	Option exercise	73K	$41.10	$3.0M	395K
2026-08-12	Chung Chih-Hsiao	GM, ASE Japan & Wuxi Tongzhi	Option exercise	292K	$41.10	$12.0M	322K
2026-07-29	Lin Chung	GM, ASE Shanghai & Electronics	Option exercise	10K	$98.60	$986K	140K
2026-07-29	Lin Chung	GM, ASE Shanghai & Electronics	Option exercise	25K	$41.10	$1.0M	130K
2026-07-22	Uang Du-Tsuen	Chief Administration Officer	Sell	3K	$665.00	$2.0M	751K
2026-07-15	Uang Du-Tsuen	Chief Administration Officer	Sell	3K	$688.00	$2.1M	754K
2026-07-13	Chang Hung Pen	Director	Option exercise	1.5M	$98.60	$147.9M	4.5M
2026-07-13	Chang Hung Pen	Director	Option exercise	3.0M	$41.10	$123.3M	3.0M
2026-07-06	Uang Du-Tsuen	Chief Administration Officer	Sell	2K	$687.00	$1.4M	757K
2026-07-01	Uang Du-Tsuen	Chief Administration Officer	Sell	3K	$709.00	$2.1M	759K
2026-06-30	Uang Du-Tsuen	Chief Administration Officer	Sell	2K	$687.00	$1.4M	762K
2026-06-30	Uang Du-Tsuen	Chief Administration Officer	Sell	3K	$664.00	$2.0M	764K
2026-06-23	Uang Du-Tsuen	Chief Administration Officer	Sell	3K	$697.00	$2.1M	767K
2026-06-22	Uang Du-Tsuen	Chief Administration Officer	Sell	5K	$667.00	$3.3M	770K
2026-06-18	Uang Du-Tsuen	Chief Administration Officer	Sell	3K	$611.00	$1.8M	775K
2026-06-03	Uang Du-Tsuen	Chief Administration Officer	Sell	5K	$617.00	$3.1M	778K
2026-06-01	Uang Du-Tsuen	Chief Administration Officer	Sell	5K	$607.00	$3.0M	783K
2026-05-27	Chen Jeffrey	Director	Sell	2K	$653.00	$1.3M	0
2026-05-26	Chen Jeffrey	Director	Sell	9K	$630.00	$5.7M	2K
2026-05-25	Chen Jeffrey	Director	Sell	9K	$590.00	$5.3M	11K
2026-05-22	Chen Jeffrey	Director	Sell	9K	$538.00	$4.8M	20K
2026-05-21	Chen Jeffrey	Director	Sell	9K	$505.00	$4.5M	29K
2026-05-20	Chen Jeffrey	Director	Sell	9K	$477.00	$4.3M	38K
2026-05-19	Chen Jeffrey	Director	Sell	9K	$483.00	$4.3M	47K
2026-05-18	Chen Jeffrey	Director	Sell	9K	$506.00	$4.6M	56K
2026-05-15	Chen Jeffrey	Director	Sell	9K	$563.00	$5.1M	65K
2026-05-14	Chen Jeffrey	Director	Sell	9K	$560.00	$5.0M	74K
2026-04-24	Chen Jeffrey	Director	Sell	9K	$473.00	$4.3M	83K
2026-04-23	Chen Jeffrey	Director	Sell	9K	$487.67	$4.4M	92K
2026-04-22	Chen Jeffrey	Director	Sell	9K	$466.50	$4.2M	101K
2026-04-21	Chen Jeffrey	Director	Sell	9K	$463.50	$4.2M	110K
2026-04-20	Chen Jeffrey	Director	Sell	9K	$461.50	$4.2M	119K
2026-04-20	Chen Tien-Szu	GM, ASE Inc. Chung-Li Branch	Sell	80K	$471.00	$37.7M	2.3M
2026-04-20	Chen Tien-Szu	GM, ASE Inc. Chung-Li Branch	Sell	50K	$467.00	$23.4M	2.3M
2026-04-20	Chen Tien-Szu	GM, ASE Inc. Chung-Li Branch	Sell	72K	$466.00	$33.6M	2.4M

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.

13F holders

Tracked managers holding ASX at their latest 13F. JSON

5 of the 30 tracked managers held ASX at their latest 13F, $265.9M in total at quarter-end prices. Fisher Asset Management is the largest at $198.6M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 4 added shares and 1 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Fisher Asset Management	2026-06-30	4.4M	$198.6M	0.06%	-403K
Millennium Management	2026-06-30	1.3M	$56.6M	0.02%	+317K
Two Sigma Investments	2026-06-30	164K	$7.4M	0.01%	+44K
AQR Capital Management	2026-06-30	60K	$2.7M	0.00%	+36K
D. E. Shaw & Co.	2026-06-30	11K	$487K	0.00%	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

ASE Technology Holding 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 ASE Technology Holding (ASX), SEC CIK 1122411, listed on NYSE, classified by the SEC as semiconductors & related devices. 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 2026-09-04.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
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 2026-09-22.JSON and CSV
Company record: EDGAR filing index for CIK 1122411Ticker, 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 ASX is sold short?

11,162,480 shares were held short at the 2026-09-30 settlement, 1.6 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 ASX's daily short volume?

On 2026-10-09, 908,112 of the 1,660,669 ASX shares reported to FINRA were sold short, 54.7% of the day's reported volume. Short volume is a flow for one day, not a position.

Does ASX have fails to deliver?

The SEC's latest file shows 1,413 ASX shares failed to deliver at settlement 2026-09-04. Fails are reported per settlement date and published twice a month with a lag.

Are ASX insiders buying or selling?

Insiders at ASX reported 2 open-market sells worth $4.1M in the last 90 days and no open-market buys. Latest filing: Chang Hung Pen (Director) on 2026-09-22.

Which tracked 13F managers own ASX?

5 of the 30 tracked 13F managers held ASX shares at their latest filing, $265.9M in all. The largest: Ken Fisher's Fisher Asset Management (4.4M shares, $198.6M), Izzy Englander's Millennium Management (1.3M shares, $56.6M), Two Sigma Investments (164K shares, $7.4M), Cliff Asness's AQR Capital Management (60K shares, $2.7M), D. E. Shaw & Co. (11K shares, $487K).

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

ASE Technology Holding (ASX)

Short interest

Daily short volume

Fails to deliver

Insider trades

13F holders

ASE Technology Holding in the regulatory record

Source and updates

How to read it

Other companies the SEC classifies as semiconductors & related devices

Datasets

Frequently Asked Questions