XOOMAR

Aeluma, Inc. (ALMU)

Every FINRA and SEC series the site collects for Aeluma, 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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3.7M

Short interest

settlement 2026-08-31

7.7

Days to cover

+3.2% vs prior

69.2%

Short share of volume

2026-09-17

58

Fails to deliver

settlement 2026-08-31

Wed 11 Nov

Next earnings

estimated; last year 2025-11-12

-$1.1M

Insider flow, 90 days

0 buys, 6 sells

As of 2026-09-17.

Short interest

FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSON

As of 31 August 2026, short interest in ALMU is 3,706,486 shares, down 125,101 shares over the last month. Over the last 48 readings it ranged from 100 shares (31 October 2024) to 3,831,587 shares (31 July 2026). The latest reading sits at the top of that range. At the reported average volume of 484K shares a day that is 7.7 days to cover, elevated.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-313,706,486+3.2%484,2107.65
2026-08-143,592,686-6.2%468,1347.67
2026-07-313,831,587+7.0%519,4007.38
2026-07-153,580,040+3.1%497,2187.20
2026-06-303,473,457+14.4%691,1975.03
2026-06-153,036,966-3.1%1,242,2542.44
2026-05-293,133,342-1.4%1,437,5412.18
2026-05-153,176,636-11.8%2,393,4901.33
2026-04-303,602,384-2.2%1,758,5692.05
2026-04-153,683,558+18.6%2,352,7771.57
2026-03-313,106,499+18.7%562,7535.52
2026-03-132,617,374+15.6%892,5682.93
2026-02-272,263,852-3.4%319,0867.09
2026-02-132,344,602+17.5%452,7915.18
2026-01-301,995,130+31.2%438,0364.55
2026-01-151,520,223-12.3%433,4613.51
2025-12-311,733,778+21.4%414,2454.19
2025-12-151,428,657+2.3%324,2124.41
2025-11-281,396,938+6.1%250,8215.57
2025-11-141,316,273+21.6%311,4494.23
2025-10-311,082,332+15.0%368,1482.94
2025-10-15941,268-14.8%416,7992.26
2025-09-301,105,049-12.1%577,8751.91
2025-09-151,256,950+19.7%419,1763.00

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 17 September 2026, the short share of ALMU volume is 69.2%, down 0.5 points over the last five sessions. Over the last 52 readings it ranged from 37.3% (5 August 2026) to 78.1% (16 September 2026). The latest reading is 12.6 points above the 30-session average of 56.5%, on 822K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-17569K822K69.2%73,388
2026-09-16410K524K78.1%0
2026-09-15179K234K76.2%504
2026-09-14179K281K63.9%0
2026-09-1168K133K51.3%0
2026-09-10131K188K69.7%0
2026-09-0973K123K59.6%0
2026-09-08172K290K59.5%0
2026-09-0476K135K56.6%50
2026-09-03101K162K62.3%3
2026-09-02117K167K70.2%0
2026-09-01110K220K49.8%400
2026-08-31137K195K70.4%58
2026-08-2894K199K47.3%5,314
2026-08-27121K269K44.9%14,868
2026-08-26126K196K64.1%4,406
2026-08-2595K167K56.9%0
2026-08-24149K304K48.9%83
2026-08-21104K214K48.8%0
2026-08-20150K338K44.5%25
2026-08-19115K220K52.2%0
2026-08-18121K237K50.9%0
2026-08-1774K172K42.8%0
2026-08-1466K174K38.0%100
2026-08-1367K146K45.8%0
2026-08-1292K163K56.4%0
2026-08-1188K141K62.6%0
2026-08-1077K124K62.3%0
2026-08-0795K197K48.3%0
2026-08-0657K127K44.6%0

Fails to deliver

SEC, by settlement date. JSON

As of 31 August 2026, the fails-to-deliver balance in ALMU is 58 shares, up 10 shares over the last settlement date. Over the last 52 readings it ranged from 13 shares (1 June 2026) to 65,735 shares (30 March 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-3158$13.14$762
2026-08-2548$13.65$655
2026-08-1713,445$18.42$248K
2026-08-13394$18.05$7K
2026-08-12270$18.19$5K
2026-08-06100$16.82$2K
2026-08-03786$16.20$13K
2026-07-29389$14.19$6K
2026-07-24196$15.95$3K
2026-07-22112$16.42$2K
2026-07-1730$15.14$454
2026-07-10350$18.25$6K
2026-07-09350$17.74$6K
2026-07-073,842$18.91$73K
2026-07-065,738$18.85$108K
2026-07-0114,120$22.08$312K
2026-06-3020,293$22.23$451K
2026-06-2915,749$20.02$315K
2026-06-265,477$20.40$112K
2026-06-163,839$24.93$96K
2026-06-12228$24.84$6K
2026-06-029,428$26.21$247K
2026-06-0113$21.58$281
2026-05-29615$23.09$14K
2026-05-28227$23.17$5K
2026-05-22714$23.31$17K
2026-05-2156$20.95$1K
2026-05-19515$20.76$11K
2026-05-1818,776$24.86$467K
2026-05-087,313$23.97$175K

Insider trades

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

Insiders at ALMU reported 6 open-market sells worth $1.1M 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: Denbaars Steven on 2026-08-27.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-08-27Denbaars Stevenn/aSell13K$13.82$173K345K
2026-08-26Denbaars Stevenn/aSell13K$13.84$173K358K
2026-08-03Klamkin JonathanChief Executive OfficerSell16K$16.85$266K2K
2026-08-03Klamkin JonathanChief Executive OfficerSell4K$16.29$68K18K
2026-08-03Klamkin JonathanChief Executive OfficerGift20K$0.00$01.3M
2026-07-01Klamkin JonathanChief Executive OfficerSell100$21.56$2K2K
2026-07-01Klamkin JonathanChief Executive OfficerSell20K$21.08$420K3K
2026-07-01Klamkin JonathanChief Executive OfficerGift20K$0.00$01.3M
2026-06-01Klamkin JonathanChief Executive OfficerSell8K$26.25$215K2K
2026-06-01Klamkin JonathanChief Executive OfficerSell2K$25.12$40K11K
2026-06-01Klamkin JonathanChief Executive OfficerSell8K$24.39$193K12K
2026-06-01Klamkin JonathanChief Executive OfficerSell1K$23.32$33K20K
2026-06-01Klamkin JonathanChief Executive OfficerSell900$22.19$20K22K
2026-06-01Klamkin JonathanChief Executive OfficerGift20K$0.00$01.4M
2026-05-20Denbaars Stevenn/aSell942$21.30$20K370K
2026-05-20Denbaars Stevenn/aSell12K$20.40$236K371K
2026-05-19Denbaars Stevenn/aSell5K$20.61$105K383K
2026-05-19Denbaars Stevenn/aSell7K$19.56$145K388K
2026-05-01Klamkin JonathanChief Executive OfficerSell676$25.71$17K2K
2026-05-01Klamkin JonathanChief Executive OfficerSell15K$25.15$378K3K
2026-05-01Klamkin JonathanChief Executive OfficerSell4K$24.20$104K18K
2026-05-01Klamkin JonathanChief Executive OfficerGift20K$0.00$01.4M
2026-04-01Klamkin JonathanChief Executive OfficerSell20K$13.10$262K1.4M
2026-04-01Klamkin JonathanChief Executive OfficerGift20K$0.00$01.4M
2026-03-04Klamkin JonathanChief Executive OfficerSell22K$18.41$401K1.4M
2026-03-04Klamkin JonathanChief Executive OfficerSell28K$17.77$501K1.5M
2026-03-04Klamkin JonathanChief Executive OfficerGift50K$0.00$01.4M
2026-02-26Denbaars Stevenn/aSell13K$15.85$198K385K
2026-02-25Denbaars Stevenn/aSell13K$17.58$220K398K
2026-02-04Tompkins Mark N.n/aSell6K$15.12$90K1.8M
2026-02-04Tompkins Mark N.n/aSell29K$14.63$418K1.8M
2026-02-02Tompkins Mark N.n/aSell38K$15.74$590K1.8M
2026-01-30Tompkins Mark N.n/aSell908$16.79$15K1.9M
2026-01-30Tompkins Mark N.n/aSell24K$15.88$383K1.9M
2026-01-29Tompkins Mark N.n/aSell5K$17.16$89K1.9M
2026-01-29Tompkins Mark N.n/aSell27K$16.75$457K1.9M
2026-01-22Tompkins Mark N.n/aSell962$18.81$18K1.9M
2026-01-22Tompkins Mark N.n/aSell29K$18.05$524K1.9M
2026-01-21Tompkins Mark N.n/aSell10$21.24$2121.9M
2026-01-21Tompkins Mark N.n/aSell2K$20.44$35K1.9M
2026-01-21Tompkins Mark N.n/aSell13K$19.30$250K2.0M
2026-01-21Tompkins Mark N.n/aSell30K$18.52$562K2.0M
2026-01-20Tompkins Mark N.n/aSell888$21.58$19K2.0M
2026-01-20Tompkins Mark N.n/aSell29K$20.66$601K2.0M
2025-12-29Klamkin JonathanChief Executive OfficerGift1.1M$0.00$02K
2025-12-26Tompkins Mark N.n/aSell3K$18.39$49K2.0M
2025-12-26Tompkins Mark N.n/aSell20K$18.01$367K2.0M
2025-12-26Tompkins Mark N.n/aSell7K$16.91$118K2.0M
2025-12-24Tompkins Mark N.n/aSell15K$16.05$241K2.1M
2025-12-23Tompkins Mark N.n/aSell15K$14.87$223K2.1M

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

3 Form 144 notices on file for ALMU worth $3.4M at the prices reported; 1 in the last 90 days worth $883K. Latest: JONATHAN KLAMKIN filed on 2026-07-01 to sell 40,000 shares ($883K) from 2026-07-01.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-07-01JONATHAN KLAMKINDirector, Officer, 10% Stockholder40K$883K0.219%2026-07-01Morgan Stanley Smith Barney LLC Executive Financial Services
2026-03-04JONATHAN KLAMKINDirector, Officer, 10% Stockholder110K$2.1M0.609%2026-03-04Morgan Stanley Smith Barney LLC Executive Financial Services
2026-02-25Steven DenBaarsdirector25K$444K0.139%2026-02-25Merrill Lynch

Large holders (13D and 13G)

One row per reporting person, newest filing first. JSON

5 holders above 5% have filed on ALMU, 1 on Schedule 13D (active intent). 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.

FiledFormHolderSharesOf classEvent
2026-07-2713GBlackRock, Inc.parent holding company964K5.3%2026-06-30
2026-05-1513G/Ano. 6Mark N. Tompkinsindividual885K4.8%2026-03-31
2026-03-3113GPerry George Herbertindividual1.0M5.6%2026-03-30
2026-03-3113Gboisei investments llcother entity1.0M5.6%2026-03-30
2026-02-1713G/Ano. 5Mark N. Tompkinsindividual2.0M11.3%2025-12-31
2026-01-0213D/Ano. 1Lee McCarthyindividual270K1.5%2024-08-01
2025-11-1413G/Ano. 4Mark N. Tompkinsindividual2.9M16.0%2025-09-30

13F holders

Tracked managers holding ALMU at their latest 13F. JSON

3 of the 30 tracked managers held ALMU at their latest 13F, $33.3M 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.

FundQuarterSharesValueOf portfolioChange in shares
D. E. Shaw & Co.2026-06-30798K$17.6M0.01%+773K
Millennium Management2026-06-30529K$11.7M0.00%+131K
Citadel Advisors2026-06-30183K$4.0M0.00%+124K

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 Q1 2026 (quarter ended 2026-03-31) Aeluma, Inc. 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

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q1 20262026-03-31$1.2M-$1.8M-147.3%-0.10
Q4 20252025-12-31$1.3M-$1.9M-145.7%-0.11
Q3 20252025-09-30$1.4M-$1.5M-107.8%-0.09
Q4 2025derived2025-06-30$1.3M-$858K-65.1%n/a
Q1 20252025-03-31$1.3M$1.5M116.4%0.11
Q4 20242024-12-31$1.6M-$2.9M-179.6%-0.24
Q3 20242024-09-30$481K-$730K-151.8%-0.06
Q4 2024derived2024-06-30$280K-$989K-353.4%n/a

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252025-06-30$4.7M-$3.0M-$1.1M$161Kn/an/a
FY 20242024-06-30$919K-$4.6M-$3.5M$322K$4Kn/a
FY 20232023-06-30$193K-$5.4M-$3.6M$590Kn/an/a
FY 20222022-06-30n/a-$3.5M-$2.3Mn/an/an/a
FY 20202020-12-31n/a-$13K-$1K$106Kn/an/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 cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. 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, 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 Aeluma, Inc. (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 method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-31.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-17.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-31.JSON and CSV
Planned sales
SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-07-01.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
Financials
SEC XBRL company factsRefreshed weekly from the SEC's structured data; values are as filed in the 10-Q and 10-K. Latest 2026-03-31.JSON and CSV
Earnings dates
SEC EDGAR 8-K Item 2.02 (full-text search)EDGAR full-text search read twice a day; the estimate is last year's date plus 52 weeks. Latest 2026-09-16.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-08-27.JSON and CSV
Company record
EDGAR filing index for CIK 1828805Ticker, 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, 18 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 ALMU is sold short?
3,706,486 shares were held short at the 2026-08-31 settlement, 7.7 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 2026-09-17, 568,915 of the 822,332 ALMU shares reported to FINRA were sold short, 69.2% 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 58 ALMU shares failed to deliver at settlement 2026-08-31. Fails are reported per settlement date and published twice a month with a lag.
Are ALMU insiders buying or selling?
Insiders at ALMU reported 6 open-market sells worth $1.1M 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: Denbaars Steven on 2026-08-27.
Have ALMU insiders filed to sell?
3 Form 144 notices on file for ALMU worth $3.4M at the prices reported; 1 in the last 90 days worth $883K. Latest: JONATHAN KLAMKIN filed on 2026-07-01 to sell 40,000 shares ($883K) from 2026-07-01.
Who owns more than 5% of ALMU?
5 holders above 5% have filed on ALMU, 1 on Schedule 13D (active intent). 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.
What did ALMU report last quarter?
In Q1 2026 (quarter ended 2026-03-31) Aeluma, Inc. 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.
Which funds hold ALMU?
3 of the 30 tracked managers held ALMU at their latest 13F, $33.3M 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.

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