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Side-by-side financial comparison of Firefly Aerospace Inc. (FLY) and STEM, INC. (STEM). Click either name above to swap in a different company.
STEM, INC. is the larger business by last-quarter revenue ($47.1M vs $30.8M, roughly 1.5× Firefly Aerospace Inc.). STEM, INC. runs the higher net margin — -33.9% vs -433.5%, a 399.6% gap on every dollar of revenue. On growth, Firefly Aerospace Inc. posted the faster year-over-year revenue change (37.6% vs -15.6%).
Firefly Aerospace, Inc. (Firefly) is an American aerospace firm based in Cedar Park, Texas. Firefly develops small- and medium-lift launch vehicles for commercial launches to orbit. Firefly's stated purpose is to increase access to space, similar to other private spaceflight companies.
StemCells, Inc. is a public biopharmaceutical company headquartered in Newark, California, that is developing purified human neural stem cells (HuCNS-SCs) in the hopes of treating central nervous system disorders and paralysis. StemCells' HuCNS-SCs have the ability to differentiate into the three main types of cells found in the central nervous system: neurons, astrocytes and oligodendrocytes.
FLY vs STEM — Head-to-Head
Income Statement — Q3 FY2025 vs Q4 FY2025
| Metric | | |
|---|---|---|
| Revenue | $30.8M | $47.1M |
| Net Profit | $-133.4M | $-16.0M |
| Gross Margin | 27.6% | 48.9% |
| Operating Margin | -202.1% | -17.7% |
| Net Margin | -433.5% | -33.9% |
| Revenue YoY | 37.6% | -15.6% |
| Net Profit YoY | -227.1% | 68.8% |
| EPS (diluted) | $-1.50 | $-4.40 |
Green = leading value per metric. Periods may differ when fiscal calendars don't align.
8-Quarter Revenue & Profit Trend
Side-by-side quarterly history. Quarters aligned by calendar period so offset fiscal years line up.
| Q4 25 | — | $47.1M | ||
| Q3 25 | $30.8M | $38.2M | ||
| Q2 25 | $15.5M | $38.4M | ||
| Q1 25 | — | $32.5M | ||
| Q4 24 | — | $55.8M | ||
| Q3 24 | $22.4M | $29.3M | ||
| Q2 24 | $21.1M | $34.0M | ||
| Q1 24 | — | $25.5M |
| Q4 25 | — | $-16.0M | ||
| Q3 25 | $-133.4M | $-23.8M | ||
| Q2 25 | $-63.8M | $202.5M | ||
| Q1 25 | — | $-25.0M | ||
| Q4 24 | — | $-51.1M | ||
| Q3 24 | $-40.8M | $-148.3M | ||
| Q2 24 | $-53.5M | $-582.3M | ||
| Q1 24 | — | $-72.3M |
| Q4 25 | — | 48.9% | ||
| Q3 25 | 27.6% | 35.5% | ||
| Q2 25 | 25.7% | 33.4% | ||
| Q1 25 | — | 32.4% | ||
| Q4 24 | — | -4.4% | ||
| Q3 24 | 34.7% | 21.2% | ||
| Q2 24 | 14.0% | 27.6% | ||
| Q1 24 | — | -95.0% |
| Q4 25 | — | -17.7% | ||
| Q3 25 | -202.1% | -33.6% | ||
| Q2 25 | -349.5% | -34.8% | ||
| Q1 25 | — | -65.0% | ||
| Q4 24 | — | -84.4% | ||
| Q3 24 | -152.9% | -493.2% | ||
| Q2 24 | -232.1% | -1705.5% | ||
| Q1 24 | — | -267.0% |
| Q4 25 | — | -33.9% | ||
| Q3 25 | -433.5% | -62.2% | ||
| Q2 25 | -410.2% | 527.8% | ||
| Q1 25 | — | -76.9% | ||
| Q4 24 | — | -91.6% | ||
| Q3 24 | -182.3% | -506.3% | ||
| Q2 24 | -253.7% | -1712.6% | ||
| Q1 24 | — | -283.9% |
| Q4 25 | — | $-4.40 | ||
| Q3 25 | $-1.50 | $-2.84 | ||
| Q2 25 | $-5.78 | $-1.79 | ||
| Q1 25 | — | $-0.15 | ||
| Q4 24 | — | $-15.29 | ||
| Q3 24 | $-3.57 | $-18.24 | ||
| Q2 24 | $-4.60 | $-71.81 | ||
| Q1 24 | — | $-0.46 |
Balance Sheet & Financial Strength
Snapshot of each company's liquidity, leverage and book value from the latest quarter.
| Metric | | |
|---|---|---|
| Cash + ST InvestmentsLiquidity on hand | $995.2M | $48.9M |
| Total DebtLower is stronger | — | — |
| Stockholders' EquityBook value | $948.8M | $-249.4M |
| Total Assets | $1.3B | $308.9M |
| Debt / EquityLower = less leverage | — | — |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | — | $48.9M | ||
| Q3 25 | $995.2M | $43.1M | ||
| Q2 25 | $205.3M | $40.8M | ||
| Q1 25 | — | $58.6M | ||
| Q4 24 | — | $56.3M | ||
| Q3 24 | $26.4M | $75.4M | ||
| Q2 24 | $21.9M | $89.6M | ||
| Q1 24 | — | $112.8M |
| Q4 25 | — | — | ||
| Q3 25 | — | — | ||
| Q2 25 | $136.1M | — | ||
| Q1 25 | — | — | ||
| Q4 24 | — | — | ||
| Q3 24 | — | — | ||
| Q2 24 | — | — | ||
| Q1 24 | — | — |
| Q4 25 | — | $-249.4M | ||
| Q3 25 | $948.8M | $-235.7M | ||
| Q2 25 | $-918.0M | $-214.1M | ||
| Q1 25 | — | $-417.5M | ||
| Q4 24 | — | $-398.4M | ||
| Q3 24 | $-665.5M | $-344.1M | ||
| Q2 24 | $-620.0M | $-203.2M | ||
| Q1 24 | — | $371.6M |
| Q4 25 | — | $308.9M | ||
| Q3 25 | $1.3B | $362.6M | ||
| Q2 25 | $466.8M | $379.2M | ||
| Q1 25 | — | $405.1M | ||
| Q4 24 | — | $437.4M | ||
| Q3 24 | — | $537.8M | ||
| Q2 24 | — | $691.5M | ||
| Q1 24 | — | $1.3B |
Cash Flow & Capital Efficiency
How much cash each business actually produces after reinvestment. Cash flow is harder to manipulate than net income.
| Metric | | |
|---|---|---|
| Operating Cash FlowLast quarter | $-53.0M | $8.2M |
| Free Cash FlowOCF − Capex | $-62.0M | — |
| FCF MarginFCF / Revenue | -201.3% | — |
| Capex IntensityCapex / Revenue | 29.0% | — |
| Cash ConversionOCF / Net Profit | — | — |
| TTM Free Cash FlowTrailing 4 quarters | — | — |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | — | $8.2M | ||
| Q3 25 | $-53.0M | $11.4M | ||
| Q2 25 | — | $-21.3M | ||
| Q1 25 | — | $8.5M | ||
| Q4 24 | — | $-14.7M | ||
| Q3 24 | — | $-9.4M | ||
| Q2 24 | — | $-11.9M | ||
| Q1 24 | — | $-621.0K |
| Q4 25 | — | — | ||
| Q3 25 | $-62.0M | — | ||
| Q2 25 | — | — | ||
| Q1 25 | — | — | ||
| Q4 24 | — | — | ||
| Q3 24 | — | — | ||
| Q2 24 | — | — | ||
| Q1 24 | — | — |
| Q4 25 | — | — | ||
| Q3 25 | -201.3% | — | ||
| Q2 25 | — | — | ||
| Q1 25 | — | — | ||
| Q4 24 | — | — | ||
| Q3 24 | — | — | ||
| Q2 24 | — | — | ||
| Q1 24 | — | — |
| Q4 25 | — | — | ||
| Q3 25 | 29.0% | — | ||
| Q2 25 | — | — | ||
| Q1 25 | — | — | ||
| Q4 24 | — | — | ||
| Q3 24 | — | — | ||
| Q2 24 | — | — | ||
| Q1 24 | — | — |
| Q4 25 | — | — | ||
| Q3 25 | — | — | ||
| Q2 25 | — | -0.11× | ||
| Q1 25 | — | — | ||
| Q4 24 | — | — | ||
| Q3 24 | — | — | ||
| Q2 24 | — | — | ||
| Q1 24 | — | — |
Financial Flow Comparison
Revenue → gross profit → operating profit → net profit for each company.
Revenue Breakdown by Segment
FLY
| Spacecraft Solutions Revenue | $21.4M | 69% |
| Launch Revenue | $9.4M | 31% |
STEM
Segment breakdown not available.
