Aeluma (ALMU)

Aeluma on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as semiconductors & related devices.

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4.0M

Short interest

settlement 2026-10-15

6.5

Days to cover

+1.9 days vs prior

45.5%

Short share of volume

2026-11-02

1,265

Fails to deliver

settlement 2026-10-14

Wed 11 Nov

Next earnings

estimated date

-$2.7M

Insider flow, 90 days

0 buys, 4 sells

As of 2026-11-02.

Short interest

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

As of 15 October 2026, short interest in ALMU is 3,973,014 shares, up 350,636 shares over the last month. Over the last 48 readings it ranged from 100 shares (31 October 2024) to 3,973,014 shares (15 October 2026). The latest reading sits at the top of that range. At the reported average volume of 613K shares a day that is 6.5 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-10-15	3,973,014	+6.7%	613,496	6.48
2026-09-30	3,722,208	+2.8%	811,378	4.59
2026-09-15	3,622,378	-2.3%	408,912	8.86
2026-08-31	3,706,486	+3.2%	484,210	7.65
2026-08-14	3,592,686	-6.2%	468,134	7.67
2026-07-31	3,831,587	+7.0%	519,400	7.38
2026-07-15	3,580,040	+3.1%	497,218	7.20
2026-06-30	3,473,457	+14.4%	691,197	5.03
2026-06-15	3,036,966	-3.1%	1,242,254	2.44
2026-05-29	3,133,342	-1.4%	1,437,541	2.18
2026-05-15	3,176,636	-11.8%	2,393,490	1.33
2026-04-30	3,602,384	-2.2%	1,758,569	2.05
2026-04-15	3,683,558	+18.6%	2,352,777	1.57
2026-03-31	3,106,499	+18.7%	562,753	5.52
2026-03-13	2,617,374	+15.6%	892,568	2.93
2026-02-27	2,263,852	-3.4%	319,086	7.09
2026-02-13	2,344,602	+17.5%	452,791	5.18
2026-01-30	1,995,130	+31.2%	438,036	4.55
2026-01-15	1,520,223	-12.3%	433,461	3.51
2025-12-31	1,733,778	+21.4%	414,245	4.19
2025-12-15	1,428,657	+2.3%	324,212	4.41
2025-11-28	1,396,938	+6.1%	250,821	5.57
2025-11-14	1,316,273	+21.6%	311,449	4.23
2025-10-31	1,082,332	+15.0%	368,148	2.94
2025-10-15	941,268	-14.8%	416,799	2.26
2025-09-30	1,105,049	-12.1%	577,875	1.91
2025-09-15	1,256,950	+19.7%	419,176	3.00
2025-08-29	1,049,827	-3.1%	199,210	5.27
2025-08-15	1,083,127	+13.2%	304,471	3.56
2025-07-31	956,723	+20.1%	359,341	2.66
2025-07-15	796,494	+15.4%	299,095	2.66
2025-06-30	690,118	+203.7%	600,289	1.15
2025-06-13	227,241	+34.0%	519,852	1.00
2025-05-30	169,630	+67.2%	241,359	1.00
2025-05-15	101,472	+30.5%	186,431	1.00
2025-04-30	77,758	+2.5%	157,003	1.00
2025-04-15	75,822	-32.5%	58,175	1.30
2025-03-31	112,273	+3927.0%	98,795	1.14
2025-03-14	2,788	+253.8%	53,664	1.00
2025-02-28	788	-15.4%	60,485	1.00
2025-02-14	931	+29.5%	23,270	1.00
2025-01-31	719	-92.5%	28,116	1.00
2025-01-15	9,540	+648.8%	61,902	1.00
2024-12-31	1,274	+167.1%	95,066	1.00
2024-12-13	477	+29.6%	31,573	1.00
2024-11-29	368	-72.2%	17,064	1.00
2024-11-15	1,325	+1225.0%	4,561	1.00
2024-10-31	100	-97.8%	6,057	1.00

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of ALMU volume is 45.5%, down 10.7 points over the last five sessions. Over the last 30 readings it ranged from 35.7% (28 October 2026) to 78.1% (30 September 2026). The latest reading is 10.6 points below the 30-session average of 56.2%, on 350K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-11-02	160K	350K	45.5%	36,794
2026-10-30	182K	333K	54.8%	21,561
2026-10-29	139K	318K	43.7%	75
2026-10-28	92K	257K	35.7%	0
2026-10-27	301K	645K	46.6%	1,220
2026-10-26	178K	316K	56.2%	808
2026-10-23	145K	240K	60.2%	55
2026-10-22	184K	368K	50.1%	0
2026-10-21	117K	203K	57.8%	101
2026-10-20	111K	251K	44.0%	0
2026-10-19	151K	303K	49.8%	20,250
2026-10-16	205K	461K	44.4%	674
2026-10-15	167K	358K	46.5%	400
2026-10-14	163K	323K	50.6%	0
2026-10-13	272K	521K	52.1%	3,049
2026-10-12	284K	406K	69.8%	108
2026-10-09	156K	227K	68.8%	3,700
2026-10-08	173K	276K	62.6%	0
2026-10-07	87K	128K	67.7%	0
2026-10-06	100K	195K	51.5%	700
2026-10-05	94K	162K	58.2%	9,842
2026-10-02	106K	181K	58.6%	100
2026-10-01	85K	142K	59.8%	1,000
2026-09-30	104K	133K	78.1%	45
2026-09-29	79K	116K	68.3%	1,107
2026-09-28	70K	119K	58.7%	0
2026-09-25	116K	183K	63.4%	4,210
2026-09-24	144K	221K	65.1%	0
2026-09-23	83K	165K	50.3%	1,722
2026-09-22	169K	256K	66.2%	49

Fails to deliver

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

As of 14 October 2026, the fails-to-deliver balance in ALMU is 1,265 shares, up 45 shares over the last settlement date. Over the last 30 readings it ranged from 27 shares (11 September 2026) to 94,038 shares (18 September 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-10-14	1,265	$9.81	$12K
2026-10-13	1,220	$10.42	$13K
2026-10-09	1,438	$11.93	$17K
2026-10-08	17,789	$12.90	$229K
2026-10-07	8,007	$13.12	$105K
2026-10-06	1,212	$13.08	$16K
2026-10-05	89	$13.12	$1K
2026-09-30	441	$12.75	$6K
2026-09-28	10,437	$13.29	$139K
2026-09-24	1,360	$13.18	$18K
2026-09-23	6,151	$13.90	$85K
2026-09-22	4,184	$13.61	$57K
2026-09-21	16,931	$12.73	$216K
2026-09-18	94,038	$11.55	$1.1M
2026-09-17	48,392	$13.43	$650K
2026-09-16	4,932	$13.13	$65K
2026-09-11	27	$13.24	$357
2026-09-10	5,403	$13.30	$72K
2026-09-03	536	$12.85	$7K
2026-09-02	48	$12.46	$598
2026-09-01	4,424	$13.10	$58K
2026-08-31	58	$13.14	$762
2026-08-25	48	$13.65	$655
2026-08-17	13,445	$18.42	$248K
2026-08-13	394	$18.05	$7K
2026-08-12	270	$18.19	$5K
2026-08-06	100	$16.82	$2K
2026-08-03	786	$16.20	$13K
2026-07-29	389	$14.19	$6K
2026-07-24	196	$15.95	$3K

Insider trades

SEC Form 4, newest first. JSON

Insiders at ALMU reported 4 open-market sells worth $2.7M in the last 90 days and no open-market buys. Latest filing: Klamkin Jonathan (Chief Executive Officer) on 2026-10-12.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-10-12	Klamkin Jonathan	Chief Executive Officer	Sell	100K	$10.53	$1.1M	1.1M
2026-09-30	Stewart Christopher P.	Chief Financial Officer	Tax withholding	6K	$12.36	$70K	68K
2026-09-21	Klamkin Jonathan	Chief Executive Officer	Tax withholding	5K	$13.61	$62K	42K
2026-09-21	Klamkin Jonathan	Chief Executive Officer	Grant	13K	$0.00	$0	47K
2026-09-21	Klamkin Jonathan	Chief Executive Officer	Grant	32K	$0.00	$0	34K
2026-09-21	Klamkin Jonathan	Chief Executive Officer	Sell	100K	$13.35	$1.3M	1.2M
2026-09-21	Stewart Christopher P.	Chief Financial Officer	Tax withholding	1K	$13.61	$20K	18K
2026-09-21	Stewart Christopher P.	Chief Financial Officer	Grant	4K	$0.00	$0	20K
2026-09-21	Stewart Christopher P.	Chief Financial Officer	Grant	16K	$0.00	$0	16K
2026-09-21	Byron Michael	Director	Exercise or conversion	25K	$5.93	$148K	38K
2026-08-27	Denbaars Steven	Director	Sell	13K	$13.82	$173K	345K
2026-08-26	Denbaars Steven	Director	Sell	13K	$13.84	$173K	358K
2026-08-03	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	22K
2026-08-03	Klamkin Jonathan	Chief Executive Officer	Sell	16K	$16.85	$266K	2K
2026-08-03	Klamkin Jonathan	Chief Executive Officer	Sell	4K	$16.29	$68K	18K
2026-08-03	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	1.3M
2026-07-01	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	22K
2026-07-01	Klamkin Jonathan	Chief Executive Officer	Sell	100	$21.56	$2K	2K
2026-07-01	Klamkin Jonathan	Chief Executive Officer	Sell	20K	$21.08	$420K	3K
2026-07-01	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	1.3M
2026-06-01	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	22K
2026-06-01	Klamkin Jonathan	Chief Executive Officer	Sell	8K	$26.25	$215K	2K
2026-06-01	Klamkin Jonathan	Chief Executive Officer	Sell	2K	$25.12	$40K	11K
2026-06-01	Klamkin Jonathan	Chief Executive Officer	Sell	8K	$24.39	$193K	12K
2026-06-01	Klamkin Jonathan	Chief Executive Officer	Sell	1K	$23.32	$33K	20K
2026-06-01	Klamkin Jonathan	Chief Executive Officer	Sell	900	$22.19	$20K	22K
2026-06-01	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	1.4M
2026-05-20	Denbaars Steven	Director	Sell	942	$21.30	$20K	370K
2026-05-20	Denbaars Steven	Director	Sell	12K	$20.40	$236K	371K
2026-05-19	Denbaars Steven	Director	Sell	5K	$20.61	$105K	383K
2026-05-19	Denbaars Steven	Director	Sell	7K	$19.56	$145K	388K
2026-05-01	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	22K
2026-05-01	Klamkin Jonathan	Chief Executive Officer	Sell	676	$25.71	$17K	2K
2026-05-01	Klamkin Jonathan	Chief Executive Officer	Sell	15K	$25.15	$378K	3K
2026-05-01	Klamkin Jonathan	Chief Executive Officer	Sell	4K	$24.20	$104K	18K
2026-05-01	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	1.4M
2026-04-01	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	22K
2026-04-01	Klamkin Jonathan	Chief Executive Officer	Sell	20K	$13.10	$262K	1.4M
2026-04-01	Klamkin Jonathan	Chief Executive Officer	Gift	20K	$0.00	$0	1.4M
2026-03-04	Klamkin Jonathan	Chief Executive Officer	Gift	50K	$0.00	$0	52K
2026-03-04	Klamkin Jonathan	Chief Executive Officer	Sell	22K	$18.41	$401K	1.4M
2026-03-04	Klamkin Jonathan	Chief Executive Officer	Sell	28K	$17.77	$501K	1.5M
2026-03-04	Klamkin Jonathan	Chief Executive Officer	Gift	50K	$0.00	$0	1.4M
2026-02-26	Denbaars Steven	Director	Sell	13K	$15.85	$198K	385K
2026-02-25	Denbaars Steven	Director	Sell	13K	$17.58	$220K	398K
2026-02-04	Tompkins Mark N.	Former 10% Owner	Sell	6K	$15.12	$90K	1.8M
2026-02-04	Tompkins Mark N.	Former 10% Owner	Sell	29K	$14.63	$418K	1.8M
2026-02-02	Tompkins Mark N.	10% owner	Sell	38K	$15.74	$590K	1.8M
2026-01-30	Tompkins Mark N.	10% owner	Sell	908	$16.79	$15K	1.9M
2026-01-30	Tompkins Mark N.	10% owner	Sell	24K	$15.88	$383K	1.9M
2026-01-29	Tompkins Mark N.	10% owner	Sell	5K	$17.16	$89K	1.9M
2026-01-29	Tompkins Mark N.	10% owner	Sell	27K	$16.75	$457K	1.9M
2026-01-22	Tompkins Mark N.	10% owner	Sell	962	$18.81	$18K	1.9M
2026-01-22	Tompkins Mark N.	10% owner	Sell	29K	$18.05	$524K	1.9M
2026-01-21	Tompkins Mark N.	10% owner	Sell	10	$21.24	$212	1.9M
2026-01-21	Tompkins Mark N.	10% owner	Sell	2K	$20.44	$35K	1.9M
2026-01-21	Tompkins Mark N.	10% owner	Sell	13K	$19.30	$250K	2.0M
2026-01-21	Tompkins Mark N.	10% owner	Sell	30K	$18.52	$562K	2.0M
2026-01-20	Tompkins Mark N.	10% owner	Sell	888	$21.58	$19K	2.0M
2026-01-20	Tompkins Mark N.	10% owner	Sell	29K	$20.66	$601K	2.0M
2025-12-29	Klamkin Jonathan	Chief Executive Officer	Gift	1.1M	$0.00	$0	1.5M
2025-12-29	Klamkin Jonathan	Chief Executive Officer	Gift	1.1M	$0.00	$0	2K
2025-12-26	Tompkins Mark N.	10% owner	Sell	3K	$18.39	$49K	2.0M
2025-12-26	Tompkins Mark N.	10% owner	Sell	20K	$18.01	$367K	2.0M
2025-12-26	Tompkins Mark N.	10% owner	Sell	7K	$16.91	$118K	2.0M
2025-12-24	Tompkins Mark N.	10% owner	Sell	15K	$16.05	$241K	2.1M
2025-12-23	Tompkins Mark N.	10% owner	Sell	15K	$14.87	$223K	2.1M
2025-12-22	Tompkins Mark N.	10% owner	Sell	35K	$14.83	$519K	2.1M
2025-12-19	Klamkin Jonathan	Chief Executive Officer	Gift	350K	$0.00	$0	350K
2025-12-19	Tompkins Mark N.	10% owner	Sell	30K	$14.70	$441K	2.1M
2025-12-19	Klamkin Jonathan	Chief Executive Officer	Gift	350K	$0.00	$0	1.1M
2025-12-18	Tompkins Mark N.	10% owner	Sell	20K	$14.37	$287K	2.1M
2025-12-10	Tompkins Mark N.	10% owner	Sell	20K	$17.49	$350K	2.2M
2025-12-09	Tompkins Mark N.	10% owner	Sell	19K	$17.06	$327K	2.2M
2025-12-09	Tompkins Mark N.	10% owner	Sell	11K	$16.39	$178K	2.2M
2025-12-08	Tompkins Mark N.	10% owner	Sell	988	$16.87	$17K	2.2M
2025-12-08	Tompkins Mark N.	10% owner	Sell	39K	$16.04	$626K	2.2M
2025-12-05	Tompkins Mark N.	10% owner	Sell	2K	$16.49	$27K	2.3M
2025-12-05	Tompkins Mark N.	10% owner	Sell	28K	$16.12	$458K	2.3M
2025-12-04	Tompkins Mark N.	10% owner	Sell	19K	$16.37	$303K	2.3M
2025-12-04	Tompkins Mark N.	10% owner	Sell	12K	$15.49	$178K	2.3M
2025-12-03	Denbaars Steven	Director	Grant	10K	$0.00	$0	395K
2025-12-03	Paglia John Kenneth	Director	Grant	11K	$0.00	$0	23K
2025-12-03	Byron Michael	Director	Grant	13K	$0.00	$0	13K
2025-12-03	ENSLEY CRAIG H	Director	Grant	11K	$0.00	$0	27K
2025-10-20	Tompkins Mark N.	10% owner	Sell	38K	$16.39	$615K	2.3M
2025-10-17	Tompkins Mark N.	10% owner	Sell	743	$18.45	$14K	2.4M
2025-10-17	Tompkins Mark N.	10% owner	Sell	6K	$17.77	$105K	2.4M
2025-10-17	Tompkins Mark N.	10% owner	Sell	33K	$16.75	$559K	2.4M
2025-10-16	Tompkins Mark N.	10% owner	Sell	810	$20.72	$17K	2.4M
2025-10-16	Tompkins Mark N.	10% owner	Sell	7K	$19.96	$133K	2.4M
2025-10-16	Tompkins Mark N.	10% owner	Sell	18K	$18.97	$333K	2.4M
2025-10-15	Tompkins Mark N.	10% owner	Sell	16K	$21.31	$338K	2.4M
2025-10-15	Tompkins Mark N.	10% owner	Sell	24K	$20.11	$486K	2.4M
2025-10-14	Tompkins Mark N.	10% owner	Sell	37K	$19.86	$732K	2.5M
2025-10-13	Tompkins Mark N.	10% owner	Sell	300	$17.57	$5K	2.5M
2025-10-13	Tompkins Mark N.	10% owner	Sell	35K	$16.97	$594K	2.5M
2025-10-10	Tompkins Mark N.	10% owner	Sell	4K	$17.16	$76K	2.5M
2025-10-10	Tompkins Mark N.	10% owner	Sell	31K	$16.60	$508K	2.5M
2025-10-09	Tompkins Mark N.	10% owner	Sell	1K	$17.25	$17K	2.6M

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 rarer.

Planned sales (Form 144)

Newest first. JSON

5 Form 144 notices on file for ALMU worth $5.9M at the prices reported; 2 in the last 90 days worth $2.4M. Latest: Klamkin Drelle Gelasca Family Trust dated 08/28/2025 filed on 2026-10-13 to sell 100,000 shares ($1.1M) from 2026-10-12.

Filed	Seller	Shares	Market value	Of outstanding	Sale from	Broker
2026-10-13	Klamkin Drelle Gelasca Family Trust dated 08/28/2025Director, Officer	100K	$1.1M	0.519%	2026-10-12	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-09-21	Klamkin Drelle Gelasca Family Trust dated 08/28/2025Director, Officer	100K	$1.3M	0.519%	2026-09-21	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-07-01	JONATHAN KLAMKINDirector, Officer, 10% Stockholder	40K	$883K	0.219%	2026-07-01	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-03-04	JONATHAN KLAMKINDirector, Officer, 10% Stockholder	110K	$2.1M	0.609%	2026-03-04	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-02-25	Steven DenBaarsdirector	25K	$444K	0.139%	2026-02-25	Merrill Lynch

Large holders (13D and 13G)

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

3 holders report 5% or more of ALMU in their latest filing, all on Schedule 13G (passive). The largest reported stake is Perry George Herbert at 5.6% of the class (1,000,000 shares), filed 2026-03-31 for an event on 2026-03-30.

Filed	Form	Holder	Shares	Of class	Event
2026-07-27	13G	BlackRock, Inc.parent holding company	964K	5.3%	2026-06-30
2026-05-15	13G/Ano. 6	Mark N. Tompkinsindividual	885K	4.8%	2026-03-31
2026-03-31	13G	Perry George Herbertindividual	1.0M	5.6%	2026-03-30
2026-03-31	13G	boisei investments llcother entity	1.0M	5.6%	2026-03-30
2026-01-02	13D/Ano. 1	Lee McCarthyindividual	270K	1.5%	2024-08-01

13F holders

Tracked managers holding ALMU at their latest 13F. JSON

3 of the 30 tracked managers held ALMU at their latest 13F, $30.2M in total at quarter-end prices. D. E. Shaw & Co. is the largest at $17.6M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 0 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
D. E. Shaw & Co.	2026-06-30	798K	$17.6M	0.01%	+773K
Millennium Management	2026-06-30	529K	$11.7M	0.00%	+131K
Citadel Advisors	2026-06-30	41K	$910K	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.

Financials

SEC XBRL, as filed. JSON

In Q3 FY 2026 (quarter ended 2026-03-31) Aeluma reported revenue of $1.2M, down 2.6% from the same quarter a year earlier, and net loss of $1.8M (-0.10 diluted EPS). In FY 2025 it generated -$1.1M of operating cash flow.

Cash: $37.8M
Equity: $40.1M
Total assets: $42.5M
Shares outstanding: 18,305,335

Quarterly, last 8 quarters

Quarter	Period end	Revenue	Net income	Margin	Diluted EPS
Q3 FY 2026	2026-03-31	$1.2M	-$1.8M	-147.3%	-0.10
Q2 FY 2026	2025-12-31	$1.3M	-$1.9M	-145.7%	-0.11
Q1 FY 2026	2025-09-30	$1.4M	-$1.5M	-107.8%	-0.09
Q4 FY 2025derived	2025-06-30	$1.3M	-$858K	-65.1%	n/a
Q3 FY 2025	2025-03-31	$1.3M	$1.5M	116.4%	0.11
Q2 FY 2025	2024-12-31	$1.6M	-$2.9M	-179.6%	-0.24
Q1 FY 2025	2024-09-30	$481K	-$730K	-151.8%	-0.06
Q4 FY 2024derived	2024-06-30	$280K	-$989K	-353.4%	n/a

Fiscal years, with buybacks and dividends

Fiscal year	Ends	Revenue	Net income	Operating cash flow	Capex	Buybacks	Dividends
FY 2025	2025-06-30	$4.7M	-$3.0M	-$1.1M	$161K	n/a	n/a
FY 2024	2024-06-30	$919K	-$4.6M	-$3.5M	$322K	$4K	n/a
FY 2023	2023-06-30	$193K	-$5.4M	-$3.6M	$590K	n/a	n/a
FY 2022	2022-06-30	n/a	-$3.5M	-$2.3M	n/a	n/a	n/a
FY 2020	2020-12-31	n/a	-$13K	-$1K	$106K	n/a	n/a

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-03-31; shares outstanding as of 2026-05-08 from the cover page.

What this page is

Aeluma 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 Aeluma (ALMU), SEC CIK 1828805, 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 updates

Short interest: FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-10-15.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-14.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 2026-10-13.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 2026-07-27.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
Financials: SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-03-31.JSON and CSV
Earnings dates: SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-09-16.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 2026-10-12.JSON and CSV
Company record: EDGAR filing index for CIK 1828805Ticker, 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 semiconductors & related devices

Other company pages

Datasets

Frequently Asked Questions

How much of ALMU is sold short?

3,973,014 shares were held short at the 2026-10-15 settlement, 6.5 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 ALMU's daily short volume?

On 2026-11-02, 159,561 of the 350,399 ALMU shares reported to FINRA were sold short, 45.5% of the day's reported volume. Short volume is a flow for one day, not a position.

Does ALMU have fails to deliver?

The SEC's latest file shows 1,265 ALMU shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.

Are ALMU insiders buying or selling?

Insiders at ALMU reported 4 open-market sells worth $2.7M in the last 90 days and no open-market buys. Latest filing: Klamkin Jonathan (Chief Executive Officer) on 2026-10-12.

Have ALMU insiders filed to sell?

Who owns 5% or more of ALMU?

What did ALMU report last quarter?

Which tracked 13F managers own ALMU?

3 of the 30 tracked 13F managers held ALMU shares at their latest filing, $30.2M in all. The largest: D. E. Shaw & Co. (798K shares, $17.6M), Izzy Englander's Millennium Management (529K shares, $11.7M), Ken Griffin's Citadel Advisors (41K shares, $910K).

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