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Side-by-side financial comparison of Castellum, Inc. (CTM) and Pulmonx Corp (LUNG). Click either name above to swap in a different company.
Pulmonx Corp is the larger business by last-quarter revenue ($20.6M vs $12.6M, roughly 1.6× Castellum, Inc.). Castellum, Inc. runs the higher net margin — -10.5% vs -66.3%, a 55.8% gap on every dollar of revenue. On growth, Castellum, Inc. posted the faster year-over-year revenue change (21.9% vs -8.7%). Over the past eight quarters, Castellum, Inc.'s revenue compounded faster (5.3% CAGR vs -0.5%).
Castellum, Inc. is a U.S.-based cybersecurity and information technology services provider. It caters to government defense agencies, public sector entities, and commercial enterprise clients, offering threat detection, data protection, cloud security, and managed IT solutions to help organizations mitigate cyber risks and safeguard critical digital infrastructure.
Pulmonx Corp is a global medical tech firm focused on interventional pulmonology solutions. It develops minimally invasive endobronchial valves to treat severe COPD and emphysema, with products sold across North America, Europe, and Asia-Pacific for patients with advanced lung conditions.
CTM vs LUNG — Head-to-Head
Income Statement — Q4 FY2025 vs Q1 FY2026
| Metric | | |
|---|---|---|
| Revenue | $12.6M | $20.6M |
| Net Profit | $-1.3M | $-13.7M |
| Gross Margin | 33.9% | 77.9% |
| Operating Margin | -11.1% | -40.9% |
| Net Margin | -10.5% | -66.3% |
| Revenue YoY | 21.9% | -8.7% |
| Net Profit YoY | 51.8% | 5.5% |
| EPS (diluted) | $-0.02 | $-0.33 |
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.
| Q1 26 | — | $20.6M | ||
| Q4 25 | $12.6M | $22.6M | ||
| Q3 25 | $14.6M | $21.5M | ||
| Q2 25 | $14.0M | $23.9M | ||
| Q1 25 | $11.7M | $22.5M | ||
| Q4 24 | $10.3M | $23.8M | ||
| Q3 24 | $11.6M | $20.4M | ||
| Q2 24 | $11.5M | $20.8M |
| Q1 26 | — | $-13.7M | ||
| Q4 25 | $-1.3M | $-10.4M | ||
| Q3 25 | $415.4K | $-14.0M | ||
| Q2 25 | $-322.1K | $-15.2M | ||
| Q1 25 | $-1.2M | $-14.4M | ||
| Q4 24 | $-2.7M | $-13.2M | ||
| Q3 24 | $-1.3M | $-14.1M | ||
| Q2 24 | $-1.8M | $-15.3M |
| Q1 26 | — | 77.9% | ||
| Q4 25 | 33.9% | 77.6% | ||
| Q3 25 | 37.6% | 74.7% | ||
| Q2 25 | 36.1% | 72.1% | ||
| Q1 25 | 39.0% | 72.5% | ||
| Q4 24 | 40.0% | 74.0% | ||
| Q3 24 | 42.7% | 73.7% | ||
| Q2 24 | 40.6% | 73.7% |
| Q1 26 | — | -40.9% | ||
| Q4 25 | -11.1% | -43.8% | ||
| Q3 25 | 3.0% | -66.9% | ||
| Q2 25 | -2.7% | -62.0% | ||
| Q1 25 | -12.7% | -64.6% | ||
| Q4 24 | -15.7% | -56.5% | ||
| Q3 24 | -11.9% | -69.3% | ||
| Q2 24 | -13.6% | -75.2% |
| Q1 26 | — | -66.3% | ||
| Q4 25 | -10.5% | -46.1% | ||
| Q3 25 | 2.8% | -64.9% | ||
| Q2 25 | -2.3% | -63.6% | ||
| Q1 25 | -10.0% | -64.1% | ||
| Q4 24 | -26.6% | -55.4% | ||
| Q3 24 | -11.0% | -69.4% | ||
| Q2 24 | -16.0% | -73.7% |
| Q1 26 | — | $-0.33 | ||
| Q4 25 | $-0.02 | $-0.25 | ||
| Q3 25 | $0.00 | $-0.34 | ||
| Q2 25 | $0.00 | $-0.38 | ||
| Q1 25 | $-0.01 | $-0.36 | ||
| Q4 24 | $-0.05 | $-0.33 | ||
| Q3 24 | $-0.02 | $-0.36 | ||
| Q2 24 | $-0.03 | $-0.39 |
Balance Sheet & Financial Strength
Snapshot of each company's liquidity, leverage and book value from the latest quarter.
| Metric | | |
|---|---|---|
| Cash + ST InvestmentsLiquidity on hand | — | $61.6M |
| Total DebtLower is stronger | — | $37.3M |
| Stockholders' EquityBook value | $35.8M | $45.8M |
| Total Assets | $41.9M | $120.0M |
| Debt / EquityLower = less leverage | — | 0.82× |
8-quarter trend — quarters aligned by calendar period.
| Q1 26 | — | $61.6M | ||
| Q4 25 | — | $69.8M | ||
| Q3 25 | — | $76.5M | ||
| Q2 25 | — | $75.5M | ||
| Q1 25 | — | $74.6M | ||
| Q4 24 | — | $70.9M | ||
| Q3 24 | — | $63.3M | ||
| Q2 24 | — | $63.5M |
| Q1 26 | — | $37.3M | ||
| Q4 25 | — | $37.1M | ||
| Q3 25 | — | $37.1M | ||
| Q2 25 | — | $37.1M | ||
| Q1 25 | — | $37.2M | ||
| Q4 24 | $8.0M | $37.2M | ||
| Q3 24 | $8.3M | $37.2M | ||
| Q2 24 | $8.7M | $37.2M |
| Q1 26 | — | $45.8M | ||
| Q4 25 | $35.8M | $54.1M | ||
| Q3 25 | $36.7M | $60.0M | ||
| Q2 25 | $31.8M | $69.1M | ||
| Q1 25 | $26.1M | $77.7M | ||
| Q4 24 | $20.2M | $85.8M | ||
| Q3 24 | $12.0M | $93.9M | ||
| Q2 24 | $12.1M | $101.2M |
| Q1 26 | — | $120.0M | ||
| Q4 25 | $41.9M | $129.3M | ||
| Q3 25 | $46.3M | $138.3M | ||
| Q2 25 | $43.4M | $147.2M | ||
| Q1 25 | $41.1M | $150.7M | ||
| Q4 24 | $37.8M | $162.8M | ||
| Q3 24 | $28.8M | $167.4M | ||
| Q2 24 | $29.5M | $172.6M |
| Q1 26 | — | 0.82× | ||
| Q4 25 | — | 0.69× | ||
| Q3 25 | — | 0.62× | ||
| Q2 25 | — | 0.54× | ||
| Q1 25 | — | 0.48× | ||
| Q4 24 | 0.40× | 0.43× | ||
| Q3 24 | 0.69× | 0.40× | ||
| Q2 24 | 0.72× | 0.37× |
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 | $-661.7K | — |
| Free Cash FlowOCF − Capex | — | — |
| FCF MarginFCF / Revenue | — | — |
| Capex IntensityCapex / Revenue | — | — |
| Cash ConversionOCF / Net Profit | — | — |
| TTM Free Cash FlowTrailing 4 quarters | — | — |
8-quarter trend — quarters aligned by calendar period.
| Q1 26 | — | — | ||
| Q4 25 | $-661.7K | $-7.1M | ||
| Q3 25 | $1.0M | $-8.2M | ||
| Q2 25 | $214.2K | $-3.9M | ||
| Q1 25 | $-2.5M | $-13.2M | ||
| Q4 24 | $-394.4K | $-6.7M | ||
| Q3 24 | $742.2K | $-7.2M | ||
| Q2 24 | $748.6K | $-5.8M |
| Q1 26 | — | — | ||
| Q4 25 | — | $-7.1M | ||
| Q3 25 | $957.0K | $-8.3M | ||
| Q2 25 | — | $-4.0M | ||
| Q1 25 | — | $-13.5M | ||
| Q4 24 | — | $-6.8M | ||
| Q3 24 | $738.9K | $-7.7M | ||
| Q2 24 | — | $-6.2M |
| Q1 26 | — | — | ||
| Q4 25 | — | -31.4% | ||
| Q3 25 | 6.5% | -38.4% | ||
| Q2 25 | — | -16.6% | ||
| Q1 25 | — | -60.0% | ||
| Q4 24 | — | -28.8% | ||
| Q3 24 | 6.4% | -37.6% | ||
| Q2 24 | — | -30.0% |
| Q1 26 | — | — | ||
| Q4 25 | — | 0.1% | ||
| Q3 25 | 0.3% | 0.4% | ||
| Q2 25 | — | 0.2% | ||
| Q1 25 | — | 1.3% | ||
| Q4 24 | 0.0% | 0.5% | ||
| Q3 24 | 0.0% | 2.0% | ||
| Q2 24 | 0.0% | 2.3% |
| Q1 26 | — | — | ||
| Q4 25 | — | — | ||
| Q3 25 | 2.41× | — | ||
| Q2 25 | — | — | ||
| Q1 25 | — | — | ||
| Q4 24 | — | — | ||
| Q3 24 | — | — | ||
| Q2 24 | — | — |
Financial Flow Comparison
Revenue → gross profit → operating profit → net profit for each company.
