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Side-by-side financial comparison of DIODES INC (DIOD) and FEDERAL SIGNAL CORP (FSS). Click either name above to swap in a different company.
FEDERAL SIGNAL CORP is the larger business by last-quarter revenue ($597.1M vs $391.6M, roughly 1.5× DIODES INC). FEDERAL SIGNAL CORP runs the higher net margin — 10.2% vs 2.6%, a 7.6% gap on every dollar of revenue. On growth, FEDERAL SIGNAL CORP posted the faster year-over-year revenue change (26.5% vs 15.4%). FEDERAL SIGNAL CORP produced more free cash flow last quarter ($89.5M vs $12.4M). Over the past eight quarters, FEDERAL SIGNAL CORP's revenue compounded faster (18.5% CAGR vs 13.9%).
Diodes Incorporated is a global semiconductor manufacturer that designs, produces and supplies discrete, analog and mixed-signal semiconductor products. Its solutions serve key end markets including automotive, industrial, consumer electronics, personal computing and communications infrastructure, with a worldwide customer base.
The Federal Signal Company was an American manufacturer of railway signaling equipment in the early 20th century. It was located in Albany, New York.
DIOD vs FSS — Head-to-Head
Income Statement — Q4 FY2025 vs Q4 FY2025
| Metric | | |
|---|---|---|
| Revenue | $391.6M | $597.1M |
| Net Profit | $10.2M | $60.8M |
| Gross Margin | 31.1% | 28.4% |
| Operating Margin | 3.4% | 14.0% |
| Net Margin | 2.6% | 10.2% |
| Revenue YoY | 15.4% | 26.5% |
| Net Profit YoY | 23.8% | 21.6% |
| EPS (diluted) | $0.23 | $0.99 |
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 | $391.6M | $597.1M | ||
| Q3 25 | $392.2M | $555.0M | ||
| Q2 25 | $366.2M | $564.6M | ||
| Q1 25 | $332.1M | $463.8M | ||
| Q4 24 | $339.3M | $472.0M | ||
| Q3 24 | $350.1M | $474.2M | ||
| Q2 24 | $319.8M | $490.4M | ||
| Q1 24 | $302.0M | $424.9M |
| Q4 25 | $10.2M | $60.8M | ||
| Q3 25 | $14.3M | $68.1M | ||
| Q2 25 | $46.1M | $71.4M | ||
| Q1 25 | $-4.4M | $46.3M | ||
| Q4 24 | $8.2M | $50.0M | ||
| Q3 24 | $13.7M | $53.9M | ||
| Q2 24 | $8.0M | $60.8M | ||
| Q1 24 | $14.0M | $51.6M |
| Q4 25 | 31.1% | 28.4% | ||
| Q3 25 | 30.7% | 29.1% | ||
| Q2 25 | 31.5% | 30.0% | ||
| Q1 25 | 31.5% | 28.2% | ||
| Q4 24 | 32.7% | 28.1% | ||
| Q3 24 | 33.7% | 29.6% | ||
| Q2 24 | 33.6% | 29.4% | ||
| Q1 24 | 33.0% | 27.3% |
| Q4 25 | 3.4% | 14.0% | ||
| Q3 25 | 3.0% | 16.9% | ||
| Q2 25 | 2.6% | 17.3% | ||
| Q1 25 | 0.4% | 14.2% | ||
| Q4 24 | 3.5% | 14.9% | ||
| Q3 24 | 6.2% | 16.0% | ||
| Q2 24 | 1.2% | 16.5% | ||
| Q1 24 | 4.3% | 12.8% |
| Q4 25 | 2.6% | 10.2% | ||
| Q3 25 | 3.6% | 12.3% | ||
| Q2 25 | 12.6% | 12.6% | ||
| Q1 25 | -1.3% | 10.0% | ||
| Q4 24 | 2.4% | 10.6% | ||
| Q3 24 | 3.9% | 11.4% | ||
| Q2 24 | 2.5% | 12.4% | ||
| Q1 24 | 4.6% | 12.1% |
| Q4 25 | $0.23 | $0.99 | ||
| Q3 25 | $0.31 | $1.11 | ||
| Q2 25 | $0.99 | $1.16 | ||
| Q1 25 | $-0.10 | $0.75 | ||
| Q4 24 | $0.18 | $0.80 | ||
| Q3 24 | $0.30 | $0.87 | ||
| Q2 24 | $0.17 | $0.99 | ||
| Q1 24 | $0.30 | $0.84 |
Balance Sheet & Financial Strength
Snapshot of each company's liquidity, leverage and book value from the latest quarter.
| Metric | | |
|---|---|---|
| Cash + ST InvestmentsLiquidity on hand | $377.0M | $63.7M |
| Total DebtLower is stronger | $25.7M | $564.6M |
| Stockholders' EquityBook value | $1.9B | $1.4B |
| Total Assets | $2.4B | $2.4B |
| Debt / EquityLower = less leverage | 0.01× | 0.41× |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | $377.0M | $63.7M | ||
| Q3 25 | $386.4M | $54.4M | ||
| Q2 25 | $327.3M | $64.7M | ||
| Q1 25 | $343.9M | $57.5M | ||
| Q4 24 | $316.1M | $91.1M | ||
| Q3 24 | $319.3M | $73.7M | ||
| Q2 24 | $273.9M | $48.6M | ||
| Q1 24 | $276.0M | $48.9M |
| Q4 25 | $25.7M | $564.6M | ||
| Q3 25 | $24.9M | $201.2M | ||
| Q2 25 | $26.4M | $258.3M | ||
| Q1 25 | $20.5M | $266.9M | ||
| Q4 24 | $20.7M | $204.4M | ||
| Q3 24 | $22.2M | $223.3M | ||
| Q2 24 | $20.3M | $248.8M | ||
| Q1 24 | $20.9M | $266.8M |
| Q4 25 | $1.9B | $1.4B | ||
| Q3 25 | $1.9B | $1.3B | ||
| Q2 25 | $1.9B | $1.3B | ||
| Q1 25 | $1.8B | $1.2B | ||
| Q4 24 | $1.8B | $1.2B | ||
| Q3 24 | $1.8B | $1.1B | ||
| Q2 24 | $1.8B | $1.1B | ||
| Q1 24 | $1.7B | $1.0B |
| Q4 25 | $2.4B | $2.4B | ||
| Q3 25 | $2.5B | $1.9B | ||
| Q2 25 | $2.5B | $1.9B | ||
| Q1 25 | $2.4B | $1.9B | ||
| Q4 24 | $2.4B | $1.8B | ||
| Q3 24 | $2.4B | $1.7B | ||
| Q2 24 | $2.4B | $1.7B | ||
| Q1 24 | $2.4B | $1.7B |
| Q4 25 | 0.01× | 0.41× | ||
| Q3 25 | 0.01× | 0.15× | ||
| Q2 25 | 0.01× | 0.20× | ||
| Q1 25 | 0.01× | 0.22× | ||
| Q4 24 | 0.01× | 0.17× | ||
| Q3 24 | 0.01× | 0.19× | ||
| Q2 24 | 0.01× | 0.23× | ||
| Q1 24 | 0.01× | 0.26× |
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 | $38.1M | $97.2M |
| Free Cash FlowOCF − Capex | $12.4M | $89.5M |
| FCF MarginFCF / Revenue | 3.2% | 15.0% |
| Capex IntensityCapex / Revenue | 6.6% | 1.3% |
| Cash ConversionOCF / Net Profit | 3.74× | 1.60× |
| TTM Free Cash FlowTrailing 4 quarters | $137.2M | $227.1M |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | $38.1M | $97.2M | ||
| Q3 25 | $79.1M | $61.1M | ||
| Q2 25 | $41.5M | $59.7M | ||
| Q1 25 | $56.7M | $36.7M | ||
| Q4 24 | $81.8M | $90.6M | ||
| Q3 24 | $54.4M | $68.8M | ||
| Q2 24 | $14.4M | $40.6M | ||
| Q1 24 | $-31.1M | $31.3M |
| Q4 25 | $12.4M | $89.5M | ||
| Q3 25 | $62.8M | $54.1M | ||
| Q2 25 | $21.1M | $52.4M | ||
| Q1 25 | $40.8M | $31.1M | ||
| Q4 24 | $62.1M | $82.1M | ||
| Q3 24 | $39.4M | $60.9M | ||
| Q2 24 | $-3.5M | $24.8M | ||
| Q1 24 | $-51.5M | $22.9M |
| Q4 25 | 3.2% | 15.0% | ||
| Q3 25 | 16.0% | 9.7% | ||
| Q2 25 | 5.8% | 9.3% | ||
| Q1 25 | 12.3% | 6.7% | ||
| Q4 24 | 18.3% | 17.4% | ||
| Q3 24 | 11.2% | 12.8% | ||
| Q2 24 | -1.1% | 5.1% | ||
| Q1 24 | -17.1% | 5.4% |
| Q4 25 | 6.6% | 1.3% | ||
| Q3 25 | 4.2% | 1.3% | ||
| Q2 25 | 5.6% | 1.3% | ||
| Q1 25 | 4.8% | 1.2% | ||
| Q4 24 | 5.8% | 1.8% | ||
| Q3 24 | 4.3% | 1.7% | ||
| Q2 24 | 5.6% | 3.2% | ||
| Q1 24 | 6.7% | 2.0% |
| Q4 25 | 3.74× | 1.60× | ||
| Q3 25 | 5.54× | 0.90× | ||
| Q2 25 | 0.90× | 0.84× | ||
| Q1 25 | — | 0.79× | ||
| Q4 24 | 9.93× | 1.81× | ||
| Q3 24 | 3.95× | 1.28× | ||
| Q2 24 | 1.80× | 0.67× | ||
| Q1 24 | -2.22× | 0.61× |
Financial Flow Comparison
Revenue → gross profit → operating profit → net profit for each company.
Revenue Breakdown by Segment
DIOD
| Distributor | $253.1M | 65% |
| Direct Sales | $138.5M | 35% |
FSS
| Vehiclesandequipment | $403.4M | 68% |
| Parts | $66.8M | 11% |
| Publicsafetyandsecurityequipment | $62.2M | 10% |
| Rentalincome | $19.0M | 3% |
| Industrialsignalingequipment | $18.2M | 3% |
| Other | $14.9M | 2% |
| Warningsystems | $12.6M | 2% |
