The oddest number in Aeluma's annual filing is $56.0 million. That is the company's cash balance after the year ended June 30, up from $3.6 million a year earlier.

The business itself moved the other way. Revenue slipped 4.4% to $4.5 million, operating losses widened to $10.2 million, and operating cash flow reached negative $3.3 million. Aeluma had more cash, but less evidence of cash coming from operations.

The source of the balance-sheet jump is not mysterious. Aeluma said public offerings supplied $43.5 million, and diluted shares increased 34.2% to 17.7 million. The cash is real; so is the financing attached to it.

Management tied the higher spending to building the operation around a smaller revenue base. The company's explanation covers materials, hiring, and the costs of scaling.

"The increase was primarily driven by an increase in material purchases to support the delivery of our products and services associated with revenue, as well as higher compensation and related costs, including salaries, stock-based compensation and employee benefits driven by new employees hired to support the expansion of the business and scaling of operations."

Aeluma, 10-K, Sept. 16, 2026

That spending showed up in research and development, which rose from $1.3 million to $4.7 million. Capital spending also climbed from $161,000 to $646,000, equal to roughly 14.5% of annual revenue. Stock compensation reached $4.5 million, a non-cash expense that nevertheless helped widen the reported loss.

The cash cushion therefore came with a two-part trade-off: Aeluma funded expansion, but the investment load grew faster than sales. Free cash flow was negative 87.7% of revenue, compared with a negative 28.1% a year earlier. Accounts receivable fell to $340,000, so the operating cash-flow deterioration was not explained by a larger unpaid customer balance. The company does not disclose a single operating cause for the revenue decline.

Aeluma's filing also shows the manufacturing footprint getting broader. During fiscal 2026, it expanded outsourced wafer fabrication and announced relationships with Tower Semiconductor and Sumitomo Chemical Advanced Technologies for wafer production and fabrication. That is consistent with a company spending ahead of a larger operation, though the annual numbers do not yet show that operation producing more revenue.

"The increase in cash was primarily attributable to net proceeds from the public offerings, totaling $43.5 million."

Aeluma, 10-K, Sept. 16, 2026

The sentence is the filing's cleanest accounting for the cash surge. It also keeps the central question intact: how much of the new capital becomes sales, and how much continues to fund losses, equipment, research, and stock-based pay?

At the latest close, Aeluma had a market capitalization of $177.1 million; its EV/sales multiple was 37.2x. The stock rose 2.3% on Sept. 16, but the market move does not answer the operating question. Aeluma's next report can add the missing comparison by showing whether revenue and operating cash flow have moved with the enlarged spending base.

For now, the year's trade-off is simple: cash for expansion, revenue for evidence.