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Side-by-side financial comparison of Ribbon Communications Inc. (RBBN) and STEM, INC. (STEM). Click either name above to swap in a different company.
Ribbon Communications Inc. is the larger business by last-quarter revenue ($162.6M vs $47.1M, roughly 3.4× STEM, INC.). Ribbon Communications Inc. runs the higher net margin — 54.8% vs -33.9%, a 88.7% gap on every dollar of revenue. On growth, Ribbon Communications Inc. posted the faster year-over-year revenue change (-10.3% vs -15.6%). Over the past eight quarters, STEM, INC.'s revenue compounded faster (36.1% CAGR vs -8.1%).
Ribbon Communications Inc. is a public company that makes software, IP and optical networking solutions for service providers, enterprises and critical infrastructure sectors. The company was formed in 2017, following the merger of Genband and Sonus Networks and is headquartered in Plano, Texas.
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.
RBBN vs STEM — Head-to-Head
Income Statement — Q1 FY2026 vs Q4 FY2025
| Metric | | |
|---|---|---|
| Revenue | $162.6M | $47.1M |
| Net Profit | $89.1M | $-16.0M |
| Gross Margin | 42.9% | 48.9% |
| Operating Margin | — | -17.7% |
| Net Margin | 54.8% | -33.9% |
| Revenue YoY | -10.3% | -15.6% |
| Net Profit YoY | — | 68.8% |
| EPS (diluted) | $0.50 | $-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.
| Q1 26 | $162.6M | — | ||
| Q4 25 | $227.3M | $47.1M | ||
| Q3 25 | $215.4M | $38.2M | ||
| Q2 25 | $220.6M | $38.4M | ||
| Q1 25 | $181.3M | $32.5M | ||
| Q4 24 | $251.4M | $55.8M | ||
| Q3 24 | $210.2M | $29.3M | ||
| Q2 24 | $192.6M | $34.0M |
| Q1 26 | $89.1M | — | ||
| Q4 25 | — | $-16.0M | ||
| Q3 25 | $-12.1M | $-23.8M | ||
| Q2 25 | $-11.1M | $202.5M | ||
| Q1 25 | $-26.2M | $-25.0M | ||
| Q4 24 | — | $-51.1M | ||
| Q3 24 | $-13.4M | $-148.3M | ||
| Q2 24 | $-16.8M | $-582.3M |
| Q1 26 | 42.9% | — | ||
| Q4 25 | 53.3% | 48.9% | ||
| Q3 25 | 50.1% | 35.5% | ||
| Q2 25 | 49.6% | 33.4% | ||
| Q1 25 | 45.4% | 32.4% | ||
| Q4 24 | 55.7% | -4.4% | ||
| Q3 24 | 52.1% | 21.2% | ||
| Q2 24 | 50.8% | 27.6% |
| Q1 26 | — | — | ||
| Q4 25 | 4.1% | -17.7% | ||
| Q3 25 | 1.3% | -33.6% | ||
| Q2 25 | 1.9% | -34.8% | ||
| Q1 25 | -10.8% | -65.0% | ||
| Q4 24 | 13.2% | -84.4% | ||
| Q3 24 | -0.4% | -493.2% | ||
| Q2 24 | -1.0% | -1705.5% |
| Q1 26 | 54.8% | — | ||
| Q4 25 | — | -33.9% | ||
| Q3 25 | -5.6% | -62.2% | ||
| Q2 25 | -5.0% | 527.8% | ||
| Q1 25 | -14.5% | -76.9% | ||
| Q4 24 | — | -91.6% | ||
| Q3 24 | -6.4% | -506.3% | ||
| Q2 24 | -8.7% | -1712.6% |
| Q1 26 | $0.50 | — | ||
| Q4 25 | $0.50 | $-4.40 | ||
| Q3 25 | $-0.07 | $-2.84 | ||
| Q2 25 | $-0.06 | $-1.79 | ||
| Q1 25 | $-0.15 | $-0.15 | ||
| Q4 24 | $0.05 | $-15.29 | ||
| Q3 24 | $-0.08 | $-18.24 | ||
| Q2 24 | $-0.10 | $-71.81 |
Balance Sheet & Financial Strength
Snapshot of each company's liquidity, leverage and book value from the latest quarter.
| Metric | | |
|---|---|---|
| Cash + ST InvestmentsLiquidity on hand | $67.6M | $48.9M |
| Total DebtLower is stronger | — | — |
| Stockholders' EquityBook value | $419.1M | $-249.4M |
| Total Assets | — | $308.9M |
| Debt / EquityLower = less leverage | — | — |
8-quarter trend — quarters aligned by calendar period.
| Q1 26 | $67.6M | — | ||
| Q4 25 | $96.4M | $48.9M | ||
| Q3 25 | $74.8M | $43.1M | ||
| Q2 25 | $60.5M | $40.8M | ||
| Q1 25 | $71.2M | $58.6M | ||
| Q4 24 | $87.8M | $56.3M | ||
| Q3 24 | $37.2M | $75.4M | ||
| Q2 24 | $64.6M | $89.6M |
| Q1 26 | — | — | ||
| Q4 25 | $342.1M | — | ||
| Q3 25 | $344.3M | — | ||
| Q2 25 | $346.5M | — | ||
| Q1 25 | $347.4M | — | ||
| Q4 24 | $348.3M | — | ||
| Q3 24 | $349.1M | — | ||
| Q2 24 | $350.0M | — |
| Q1 26 | $419.1M | — | ||
| Q4 25 | $449.0M | $-249.4M | ||
| Q3 25 | $360.1M | $-235.7M | ||
| Q2 25 | $370.4M | $-214.1M | ||
| Q1 25 | $381.8M | $-417.5M | ||
| Q4 24 | $404.6M | $-398.4M | ||
| Q3 24 | $395.5M | $-344.1M | ||
| Q2 24 | $405.0M | $-203.2M |
| Q1 26 | — | — | ||
| Q4 25 | $1.2B | $308.9M | ||
| Q3 25 | $1.1B | $362.6M | ||
| Q2 25 | $1.1B | $379.2M | ||
| Q1 25 | $1.1B | $405.1M | ||
| Q4 24 | $1.2B | $437.4M | ||
| Q3 24 | $1.1B | $537.8M | ||
| Q2 24 | $1.1B | $691.5M |
| Q1 26 | — | — | ||
| Q4 25 | 0.76× | — | ||
| Q3 25 | 0.96× | — | ||
| Q2 25 | 0.94× | — | ||
| Q1 25 | 0.91× | — | ||
| Q4 24 | 0.86× | — | ||
| Q3 24 | 0.88× | — | ||
| Q2 24 | 0.86× | — |
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 | — | $8.2M |
| 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 | $29.2M | $8.2M | ||
| Q3 25 | $26.5M | $11.4M | ||
| Q2 25 | $-795.0K | $-21.3M | ||
| Q1 25 | $-3.5M | $8.5M | ||
| Q4 24 | $61.8M | $-14.7M | ||
| Q3 24 | $-14.8M | $-9.4M | ||
| Q2 24 | $-9.8M | $-11.9M |
| Q1 26 | — | — | ||
| Q4 25 | $27.3M | — | ||
| Q3 25 | $21.0M | — | ||
| Q2 25 | $-6.5M | — | ||
| Q1 25 | $-15.7M | — | ||
| Q4 24 | $53.8M | — | ||
| Q3 24 | $-23.7M | — | ||
| Q2 24 | $-12.9M | — |
| Q1 26 | — | — | ||
| Q4 25 | 12.0% | — | ||
| Q3 25 | 9.7% | — | ||
| Q2 25 | -2.9% | — | ||
| Q1 25 | -8.7% | — | ||
| Q4 24 | 21.4% | — | ||
| Q3 24 | -11.3% | — | ||
| Q2 24 | -6.7% | — |
| Q1 26 | — | — | ||
| Q4 25 | 0.9% | — | ||
| Q3 25 | 2.6% | — | ||
| Q2 25 | 2.6% | — | ||
| Q1 25 | 6.7% | — | ||
| Q4 24 | 3.2% | — | ||
| Q3 24 | 4.2% | — | ||
| Q2 24 | 1.6% | — |
| Q1 26 | — | — | ||
| Q4 25 | — | — | ||
| Q3 25 | — | — | ||
| Q2 25 | — | -0.11× | ||
| Q1 25 | — | — | ||
| Q4 24 | — | — | ||
| Q3 24 | — | — | ||
| Q2 24 | — | — |
Financial Flow Comparison
Revenue → gross profit → operating profit → net profit for each company.
Revenue Breakdown by Segment
RBBN
| Service | $94.5M | 58% |
| Product | $68.1M | 42% |
STEM
Segment breakdown not available.
