SEC Form 4
Aeluma, Inc. (ALMU) insider trading
In the 12 months to Oct 26, 2026, 4 ALMU insiders reported open-market sales of $15.3M across 19 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $15.3M
- 19 filings · 4 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 11 of 19
- $6.6M of $15.3M sold (43%)
Who traded ALMU, and when
- Sale
- Sale, pre-arranged (10b5-1)
ALMU daily close from Oct 27, 2025 to Oct 26, 2026, between $6.78 and $31.49, last $6.78. 19 sale and 0 purchase filings by 4 insiders, marked at their filing dates. Mark N. Tompkins, 10% owner → Other: sold $8.8M across 7 filings, first filed Dec 9, 2025, last Feb 5, 2026. Jonathan Klamkin, Chief Executive Officer: sold $5.3M across 8 filings, first filed Mar 5, 2026, last Oct 14, 2026. Steven Denbaars, Director: sold $1.3M across 3 filings, first filed Feb 27, 2026, last Aug 28, 2026. Lee McCarthy, 10% owner: sold $4.0K across 1 filing, first filed Jan 2, 2026, last Jan 2, 2026.
Largest mark · tap a row for others
Mark N. Tompkins · 10% owner
Filing 1 of 2 within a week · $2,461,919 total
Sale $1,607,596
100,000 shares at $16.08 avg
Filed Dec 9, 2025 · traded Dec 4
Close on filing date $17.09
Mark N. Tompkins · 10% owner → Other
10% owner → Other
$8.8M soldJonathan Klamkin · Chief Executive Officer
Chief Executive Officer
$5.3M soldSteven Denbaars · Director
Director
$1.3M soldLee McCarthy · 10% owner
10% owner
$4.0K soldOpen-market trades
19 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Mark N. Tompkins | 10% owner → Other | $8.8M | — | 7 | — | |
| Jonathan Klamkin | Chief Executive Officer | $5.3M | — | 8 | 100% of sales | |
| Steven Denbaars | Director | $1.3M | — | 3 | 100% of sales | |
| Lee McCarthy | 10% owner | $4.0K | — | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Jonathan Klamkin Chief Executive Officer | SalePre-arranged (10b5-1) | 100,000 | $10.53 | $1.1M | 1,126,995 | |
traded | Jonathan Klamkin Chief Executive Officer | SalePre-arranged (10b5-1) | 100,000 | $13.35 | $1.3M | 1,226,995 | |
traded | Steven Denbaars Director | SalePre-arranged (10b5-1) | 25,000 | $13.83 | $345.7K | 345,209 | |
traded | Jonathan Klamkin Chief Executive Officer | SalePre-arranged (10b5-1) | 20,000 | $16.73 | $334.6K | 2,403 | |
traded | Jonathan Klamkin Chief Executive Officer | SalePre-arranged (10b5-1) | 20,000 | $21.08 | $421.7K | 2,403 | |
traded | Jonathan Klamkin Chief Executive Officer | SalePre-arranged (10b5-1) | 20,000 | $25.03 | $500.7K | 2,403 | |
traded | Steven Denbaars Director | SalePre-arranged (10b5-1) | 25,000 | $20.23 | $505.6K | 371,151 | |
traded | Jonathan Klamkin Chief Executive Officer | SalePre-arranged (10b5-1) | 20,000 | $24.96 | $499.3K | 18,103 | |
traded | Jonathan Klamkin Chief Executive Officer | SalePre-arranged (10b5-1) | 20,000 | $13.10 | $262.0K | 1,409,398 | |
traded | Jonathan Klamkin Chief Executive Officer | SalePre-arranged (10b5-1) | 50,000 | $18.05 | $902.6K | 1,451,192 | |
traded | Steven Denbaars Director | SalePre-arranged (10b5-1) | 25,000 | $16.71 | $417.9K | 385,088 | |
traded | Mark N. Tompkins Other | Sale | 34,500 | $14.71 | $507.7K | 1,790,488 | |
traded | Mark N. Tompkins 10% owner | Sale | 95,000 | $16.15 | $1.5M | 1,824,988 | |
traded | Mark N. Tompkins 10% owner | Sale | 105,000 | $19.14 | $2.0M | 1,919,988 | |
traded | Lee McCarthy 10% owner | Sale | 649,570 | $0.01 | $4.0K | 977,425 | |
traded | Mark N. Tompkins 10% owner | Sale | 60,000 | $16.62 | $997.4K | 2,048,018 | |
traded | Mark N. Tompkins 10% owner | Sale | 85,000 | $14.68 | $1.2M | 2,084,988 | |
traded | Mark N. Tompkins 10% owner | Sale | 50,000 | $17.09 | $854.3K | 2,169,988 | |
traded | Mark N. Tompkins 10% owner | Sale | 100,000 | $16.08 | $1.6M | 2,219,988 |
GET /stocks/filings/vX/form-4?tickers=ALMU&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"ALMU"
],
"issuer_cik": "0001828805",
"owner_cik": "0001869626",
"accession_number": "0001869626-26-000028",
"form_type": "4",
"filing_date": "2026-10-14",
"period_of_report": "2026-10-12",
"issuer_name": "Aeluma, Inc.",
"issuer_trading_symbol": "ALMU",
"owner_name": "Klamkin Jonathan",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Executive Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-12",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 100000,
"transaction_price_per_share": 10.5343,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 1126995,
"transaction_value": 1053430,
"direct_or_indirect": "I",
"nature_of_ownership": "By Family Trust",
"footnotes": [
{
"id": "F1",
"description": "Sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 23, 2026."
},
{
"id": "F2",
"description": "Reflects the weighted average price of 100,000 shares of common stock of Aeluma, Inc. sold by the reporting person in multiple transactions on October 12, 2026 with sale prices ranging from $10.31 to $11.15 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."
}
]
},
{
"tickers": [
"ALMU"
],
"issuer_cik": "0001828805",
"owner_cik": "0001869626",
"accession_number": "0001869626-26-000026",
"form_type": "4",
"filing_date": "2026-09-23",
"period_of_report": "2026-09-21",
"issuer_name": "Aeluma, Inc.",
"issuer_trading_symbol": "ALMU",
"owner_name": "Klamkin Jonathan",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Executive Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-09-21",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 100000,
"transaction_price_per_share": 13.3532,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 1226995,
"transaction_value": 1335320,
"direct_or_indirect": "I",
"nature_of_ownership": "By Family Trust",
"footnotes": [
{
"id": "F1",
"description": "Sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 23, 2026."
},
{
"id": "F2",
"description": "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."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 28 records
- Option exercises1 record
- Tax withholding3 records
- Grants and awards8 records
- Gifts16 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Role
- The title on each filing. Someone whose title changed shows more than one.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
- Counted once
- When several owners (a fund and its partners, say) report the same trade, it's counted once. Corrected filings replace the originals.
Frequently asked questions
Has Aeluma, Inc.'s CEO sold stock?
Yes. Jonathan Klamkin (CEO) sold 350,000 shares ($5.3M) between Mar 2026 and Oct 2026, all under a pre-arranged 10b5-1 plan.
How current is ALMU’s insider data?
These are ALMU Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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