Astera Labs, Inc. (ALAB)

Every FINRA and SEC series the site collects for Astera Labs, 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 semiconductors & related devices.

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8.8M

Short interest

settlement 2026-08-14

1.9

Days to cover

-3.9% vs prior

42.8%

Short share of volume

2026-09-11

24,226

Fails to deliver

settlement 2026-08-14

-$204.1M

Insider flow, 90 days

0 buys, 179 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 ALAB is 8,753,228 shares, down 772,596 shares over the last month. Over the last 48 readings it ranged from 7,678,854 shares (31 January 2025) to 15,495,055 shares (31 March 2026). At the reported average volume of 4.7M shares a day that is 1.9 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-08-14	8,753,228	-3.9%	4,734,294	1.85
2026-07-31	9,109,856	-4.4%	4,494,876	2.03
2026-07-15	9,525,824	-24.9%	4,602,991	2.07
2026-06-30	12,676,294	+10.1%	7,296,656	1.74
2026-06-15	11,511,657	-3.3%	5,580,970	2.06
2026-05-29	11,906,625	-4.1%	7,029,384	1.69
2026-05-15	12,417,409	-5.4%	5,734,203	2.17
2026-04-30	13,125,304	-9.1%	5,671,640	2.31
2026-04-15	14,440,640	-6.8%	5,695,210	2.54
2026-03-31	15,495,055	+14.6%	4,355,140	3.56
2026-03-13	13,516,520	+25.6%	4,874,844	2.77
2026-02-27	10,763,918	-7.5%	3,848,917	2.80
2026-02-13	11,632,347	+9.2%	7,593,876	1.53
2026-01-30	10,653,797	-4.4%	4,674,980	2.28
2026-01-15	11,139,247	-4.9%	5,005,664	2.23
2025-12-31	11,711,907	-4.7%	3,448,172	3.40
2025-12-15	12,293,014	+1.8%	7,056,946	1.74
2025-11-28	12,081,579	+13.5%	6,152,726	1.96
2025-11-14	10,645,508	+26.8%	6,402,199	1.66
2025-10-31	8,398,986	-9.3%	4,949,276	1.70
2025-10-15	9,260,453	+3.0%	7,049,741	1.31
2025-09-30	8,989,174	-6.6%	7,564,602	1.19
2025-09-15	9,621,313	+4.5%	5,389,988	1.79
2025-08-29	9,206,501	+2.3%	4,187,157	2.20

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of ALAB volume is 42.8%, up 3.7 points over the last five sessions. Over the last 52 readings it ranged from 26.9% (17 July 2026) to 67.8% (17 August 2026). The latest reading is 9.9 points below the 30-session average of 52.7%, on 890K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-09-11	381K	890K	42.8%	380
2026-09-10	695K	1.2M	58.0%	3,034
2026-09-09	693K	1.4M	50.7%	467
2026-09-08	1.3M	2.5M	53.9%	4,328
2026-09-04	1.5M	2.9M	50.5%	3,245
2026-09-03	513K	1.3M	39.1%	1,735
2026-09-02	418K	1.3M	32.6%	5,193
2026-09-01	663K	1.2M	55.3%	2,252
2026-08-31	439K	765K	57.4%	1,871
2026-08-28	453K	956K	47.4%	415
2026-08-27	659K	1.1M	61.0%	321
2026-08-26	358K	758K	47.2%	4,089
2026-08-25	406K	712K	56.9%	5,685
2026-08-24	497K	1.1M	44.3%	1,510
2026-08-21	490K	1.1M	45.5%	3,932
2026-08-20	449K	1.0M	43.2%	2,374
2026-08-19	713K	1.6M	43.4%	1,503
2026-08-18	1.1M	1.9M	56.5%	3,037
2026-08-17	1.9M	2.8M	67.8%	544,127
2026-08-14	628K	1.1M	56.0%	1,775
2026-08-13	741K	1.2M	63.8%	29,220
2026-08-12	778K	1.3M	57.8%	364
2026-08-11	546K	1.0M	54.1%	1,386
2026-08-10	655K	1.2M	55.5%	1,213
2026-08-07	795K	1.5M	54.7%	8,200
2026-08-06	1.2M	2.0M	59.0%	80,075
2026-08-05	2.0M	3.4M	59.3%	94,111
2026-08-04	1.7M	3.0M	57.9%	1,776
2026-08-03	881K	1.6M	53.4%	463
2026-07-31	1.2M	2.1M	56.9%	5,455

Fails to deliver

SEC, by settlement date. JSON

As of 14 August 2026, the fails-to-deliver balance in ALAB is 24,226 shares, down 16,457 shares over the last settlement date. Over the last 52 readings it ranged from 1 share (17 March 2026) to 312,814 shares (22 June 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-08-14	24,226	$322.78	$7.8M
2026-08-11	40,683	$317.23	$12.9M
2026-08-10	43,973	$334.17	$14.7M
2026-08-05	6,312	$361.67	$2.3M
2026-08-04	22,147	$321.05	$7.1M
2026-07-29	50	$260.23	$13K
2026-07-27	25	$291.58	$7K
2026-07-20	2,700	$303.62	$820K
2026-07-17	1,266	$319.74	$405K
2026-07-09	69	$393.16	$27K
2026-07-08	100	$382.89	$38K
2026-07-07	338	$432.74	$146K
2026-07-06	47,345	$406.42	$19.2M
2026-06-30	5,727	$455.96	$2.6M
2026-06-29	423	$391.74	$166K
2026-06-25	718	$399.92	$287K
2026-06-23	113	$439.66	$50K
2026-06-22	312,814	$417.07	$130.5M
2026-06-17	11,373	$361.71	$4.1M
2026-06-15	100	$367.15	$37K
2026-06-12	3,127	$367.47	$1.1M
2026-06-11	158,815	$330.86	$52.5M
2026-06-10	137,794	$341.70	$47.1M
2026-06-09	99	$346.33	$34K
2026-06-08	100	$317.06	$32K
2026-06-05	1,093	$358.05	$391K
2026-06-04	133,618	$363.54	$48.6M
2026-06-02	184	$320.09	$59K
2026-06-01	3,982	$342.85	$1.4M
2026-04-30	108	$196.85	$21K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

Insiders at ALAB reported 179 open-market sells worth $204.1M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Dyckerhoff Stefan A on 2026-09-02.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	32	$276.75	$9K	3K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	407	$276.75	$113K	295K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	172	$276.75	$48K	50K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	148	$275.53	$41K	3K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	2K	$275.53	$514K	295K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	785	$275.53	$216K	51K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	429	$274.79	$118K	3K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	5K	$274.79	$1.5M	297K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	2K	$274.79	$625K	51K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	52	$273.64	$14K	4K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	650	$273.64	$178K	302K
2026-09-02	Dyckerhoff Stefan A	n/a	Sell	273	$273.64	$75K	54K
2026-09-01	ALBA MANUEL	n/a	Sell	196	$288.95	$57K	254K
2026-09-01	ALBA MANUEL	n/a	Sell	225	$287.93	$65K	254K
2026-09-01	ALBA MANUEL	n/a	Sell	588	$287.00	$169K	254K
2026-09-01	ALBA MANUEL	n/a	Sell	74	$285.18	$21K	255K
2026-09-01	ALBA MANUEL	n/a	Sell	491	$284.18	$140K	255K
2026-09-01	ALBA MANUEL	n/a	Sell	868	$283.18	$246K	255K
2026-09-01	ALBA MANUEL	n/a	Sell	1K	$282.13	$363K	256K
2026-09-01	ALBA MANUEL	n/a	Sell	3K	$281.16	$797K	258K
2026-09-01	ALBA MANUEL	n/a	Sell	13K	$280.04	$3.7M	260K
2026-09-01	ALBA MANUEL	n/a	Sell	8K	$279.28	$2.3M	273K
2026-09-01	ALBA MANUEL	n/a	Sell	5K	$278.33	$1.3M	282K
2026-09-01	ALBA MANUEL	n/a	Sell	568	$277.32	$158K	286K
2026-09-01	ALBA MANUEL	n/a	Sell	892	$288.95	$258K	1.1M
2026-09-01	ALBA MANUEL	n/a	Sell	1K	$287.93	$293K	1.1M
2026-09-01	ALBA MANUEL	n/a	Sell	3K	$286.99	$768K	1.1M
2026-09-01	ALBA MANUEL	n/a	Sell	340	$285.18	$97K	1.1M
2026-09-01	ALBA MANUEL	n/a	Sell	2K	$284.17	$638K	1.1M
2026-09-01	ALBA MANUEL	n/a	Sell	4K	$283.19	$1.1M	1.1M
2026-09-01	ALBA MANUEL	n/a	Sell	6K	$282.13	$1.7M	1.1M
2026-09-01	ALBA MANUEL	n/a	Sell	13K	$281.16	$3.6M	1.1M
2026-09-01	ALBA MANUEL	n/a	Sell	59K	$280.04	$16.6M	1.2M
2026-09-01	ALBA MANUEL	n/a	Sell	37K	$279.28	$10.4M	1.2M
2026-09-01	ALBA MANUEL	n/a	Sell	21K	$278.33	$5.8M	1.3M
2026-09-01	ALBA MANUEL	n/a	Sell	3K	$277.32	$714K	1.3M
2026-08-17	Gajendra Sanjay	President and COO	Sell	13K	$333.60	$4.2M	1.1M
2026-08-17	Gajendra Sanjay	President and COO	Sell	7K	$334.23	$2.3M	1.1M
2026-08-17	Gajendra Sanjay	President and COO	Sell	2K	$335.41	$598K	1.1M
2026-08-17	Gajendra Sanjay	President and COO	Sell	3K	$336.65	$992K	1.1M
2026-08-17	Gajendra Sanjay	President and COO	Sell	10K	$337.76	$3.5M	1.1M
2026-08-17	Gajendra Sanjay	President and COO	Sell	8K	$338.58	$2.7M	1.2M
2026-08-17	Gajendra Sanjay	President and COO	Sell	6K	$339.74	$2.2M	1.2M
2026-08-17	Gajendra Sanjay	President and COO	Sell	3K	$340.58	$891K	1.2M
2026-08-17	Gajendra Sanjay	President and COO	Sell	2K	$341.71	$550K	1.2M
2026-08-17	Gajendra Sanjay	President and COO	Sell	5K	$342.95	$1.9M	1.2M
2026-08-17	Gajendra Sanjay	President and COO	Sell	4K	$343.94	$1.3M	1.2M
2026-08-17	Gajendra Sanjay	President and COO	Sell	17K	$344.99	$6.0M	1.2M
2026-08-17	Gajendra Sanjay	President and COO	Sell	3K	$346.13	$874K	1.2M
2026-08-17	Gajendra Sanjay	President and COO	Sell	4K	$347.01	$1.2M	1.2M

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

5 Form 144 notices on file for ALAB worth $112.2M at the prices reported; 5 in the last 90 days worth $112.2M. Latest: Dyckerhoff Stefan A filed on 2026-09-02 to sell 12,499 shares ($3.4M) from 2026-09-02.

Filed	Seller	Shares	Market value	Of outstanding	Sale from	Broker
2026-09-02	Dyckerhoff Stefan AAffiliate	12K	$3.4M	0.007%	2026-09-02	Stifel Nicolaus & Company Inc
2026-09-01	Mar 2011 Childrens TrustDirector	170K	$50.5M	0.098%	2026-09-01	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-09-01	Alba 2003 Living TrustDirector	150K	$44.5M	0.086%	2026-09-01	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-09-01	Casa Alameda 2007, LLCDirector	33K	$9.8M	0.019%	2026-09-01	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-06	Dyckerhoff Stefan AAffiliate	12K	$3.9M	0.007%	2026-08-06	Stifel Nicolaus & Company Inc

Large holders (13D and 13G)

One row per reporting person, newest filing first. JSON

1 holder above 5% has filed on ALAB, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 7.4% of the class (12,667,232 shares), filed 2026-07-27 for an event on 2026-06-30.

Filed	Form	Holder	Shares	Of class	Event
2026-07-27	13G/Ano. 2	BlackRock, Inc.parent holding company	12.7M	7.4%	2026-06-30

13F holders

Tracked managers holding ALAB at their latest 13F. JSON

8 of the 30 tracked managers held ALAB at their latest 13F, $3.02B in total at quarter-end prices. Citadel Advisors is the largest at $1.88B (0.2% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 5 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Citadel Advisors	2026-06-30	3.9M	$1.88B	0.21%	+1.6M
D. E. Shaw & Co.	2026-06-30	976K	$471.5M	0.22%	-858K
Millennium Management	2026-06-30	814K	$393.4M	0.14%	+199K
Point72 Asset Management	2026-06-30	193K	$93.1M	0.10%	-31K
Two Sigma Investments	2026-06-30	157K	$75.8M	0.05%	-827K
Renaissance Technologies	2026-06-30	153K	$74.1M	0.10%	+24K
AQR Capital Management	2026-06-30	67K	$32.4M	0.01%	-21K
Bridgewater Associates	2026-06-30	992	$479K	0.00%	-750K

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

Astera Labs, 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 Astera Labs, Inc. (ALAB), SEC CIK 1736297, listed on Nasdaq, classified by the SEC as semiconductors & related devices. 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 2026-09-02.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 2026-07-27.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 2026-09-02.JSON and CSV
Company record: EDGAR filing index for CIK 1736297Ticker, 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.

Datasets

Frequently Asked Questions

How much of ALAB is sold short?

8,753,228 shares were held short at the 2026-08-14 settlement, 1.9 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 ALAB's daily short volume?

On 2026-09-11, 381,015 of the 889,502 ALAB shares reported to FINRA were sold short, 42.8% of the day's reported volume. Short volume is a flow for one day, not a position.

Does ALAB have fails to deliver?

The SEC's latest file shows 24,226 ALAB shares failed to deliver at settlement 2026-08-14. Fails are reported per settlement date and published twice a month with a lag.

Are ALAB insiders buying or selling?

Have ALAB insiders filed to sell?

Who owns more than 5% of ALAB?

Which funds hold ALAB?

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

Astera Labs, Inc. (ALAB)

Short interest

Daily short volume

Fails to deliver

Insider trades

Planned sales (Form 144)

Large holders (13D and 13G)

13F holders

Astera Labs, Inc. in the regulatory record

Source and method

How to read it

Other companies the SEC classifies as semiconductors & related devices

Datasets

Frequently Asked Questions