Aeluma Insider Mark Tompkins Has Sold $21.4M in ALMU Stock While Retaining 1.79M Shares

Mark Tompkins, a major insider at semiconductor company Aeluma (ALMU), has sold $21.4 million in stock across 155 transactions — but still holds 1.79 million shares.

The Numbers

Metric	Value
Career Sell Value	$21.4M
Career Buy Value	$2.2M
Total Transactions	155
Last Transaction	2026-02-02
Shares Remaining	1,790,488

Recent Activity

Date	Type	Shares	Price	Est. Value
2026-02-04	Sell	5,956	$15.1200	$90K
2026-02-04	Sell	28,544	$14.6300	$418K
2026-02-02	Sell	37,500	$15.7400	$590K
2026-01-30	Sell	908	$16.7900	$15K
2026-01-30	Sell	24,092	$15.8800	$383K

Tompkins has been an active seller in early 2026, disposing of $2.0M in shares across six transactions in late January and early February at prices between $14.63 and $17.16. The sales appear systematic — consistent lot sizes across consecutive trading days.

What It Means

Unlike many insider sellers who exit entirely, Tompkins maintains a commanding 1.79M-share position worth approximately $27M at current prices. His $2.2M in career purchases alongside $21.4M in sales suggests he built his position primarily through grants and options. The 10:1 sell-to-buy ratio is moderate by insider standards.

Aeluma operates in the compound semiconductor space, targeting applications in lidar, 3D sensing, and defense. As a small-cap company, ALMU is more sensitive to insider trading signals. Tompkins' pattern of selling while retaining a large position suggests portfolio diversification rather than a bearish outlook.

What to Watch

• ALMU revenue growth from lidar and defense contracts
• Whether Tompkins' selling pace increases at higher prices
• Institutional interest in upcoming 13F filings
• Aeluma product adoption in autonomous vehicle programs