Jonathan Klamkin - 21 Sep 2026 Form 4 Insider Report for Aeluma, Inc. (ALMU)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: ALMU
Reported as of: 21 Sep 2026
Net transaction value: -$1,335,320
SEC form: 4
Accepted by SEC: 23 Sep 2026, 19:16:06 UTC
Prior SEC filing: 05 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Joshua L. Colburn, Attorney-in-Fact

Key filing fact

Jonathan Klamkin filed Form 4 for Aeluma, Inc. (ALMU) on 23 Sep 2026.

Key facts

This page summarizes Jonathan Klamkin's Form 4 filing for Aeluma, Inc. (ALMU).
5 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 23 Sep 2026, 19:16.

Change

Previous filing in this sequence was filed on 05 Aug 2026.
Current net transaction value: -$1,335,320.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001869626 Primary reporting owner

Klamkin Jonathan

Relationship: Chief Executive Officer, Director
Address: 27 CASTILIAN DRIVE, GOLETA
Signature: /s/ Joshua L. Colburn, Attorney-in-Fact
Signature date: 23 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ALMU transaction

Common Stock

Sale

Transaction value: $1,335,320
Shares: -100,000
Change %: -7.5%
Price: $13.35
Shares after: 1,226,995
Date: 21 Sep 2026
Ownership: By Family Trust
Footnotes: F1, F2

ALMU transaction

Common Stock

Award

Transaction value
Shares: +31,771
Change %: +1322%
Price: $0.000000^*
Shares after: 34,174
Date: 21 Sep 2026
Ownership: Direct
Footnotes: F3

ALMU transaction

Common Stock

Award

Transaction value
Shares: +12,675
Change %: +37%
Price: $0.000000^*
Shares after: 46,849
Date: 21 Sep 2026
Ownership: Direct
Footnotes: F4

ALMU transaction

Common Stock

Tax liability

Transaction value
Shares: -4,547
Change %: -9.7%
Price: $13.61^*
Shares after: 42,302
Date: 21 Sep 2026
Ownership: Direct

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ALMU transaction Derivative

Stock Option (right to buy)

Award

Transaction value
Shares: +75,135
Change %
Price: $0.000000^*
Shares after: 75,135
Date: 21 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 75,135
Exercise price: $13.61
Footnotes: F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 5 footnotes

Footnote F1

Sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 23, 2026.

Footnote F2

Reflects the weighted average price of 100,000 shares of common stock of Aeluma, Inc. sold by the reporting person in multiple transactions on September 21, 2026 with sale prices ranging from $12.70 to $13.65 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Footnote F3

Restricted stock units ("RSUs") scheduled to vest and settle into an equal number of shares of common stock with respect to 25% of the shares on September 30, 2027 and thereafter in 12 substantially equivalent quarterly increments on the last day of each calendar quarter.

Footnote F4

Stock award in lieu of cash bonus.

Footnote F5

Stock options scheduled to vest with respect to 25% of the shares on first anniversary of the grant date, and thereafter in 36 substantially equivalent increments on each monthly anniversary of the grant date.