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Side-by-side financial comparison of PDF SOLUTIONS INC (PDFS) and ZK International Group Co., Ltd. (ZKIN). Click either name above to swap in a different company.
ZK International Group Co., Ltd. is the larger business by last-quarter revenue ($108.2M vs $62.4M, roughly 1.7× PDF SOLUTIONS INC). PDF SOLUTIONS INC runs the higher net margin — -0.1% vs -2.6%, a 2.5% gap on every dollar of revenue. PDF SOLUTIONS INC produced more free cash flow last quarter ($7.5M vs $-7.5M).
PDF Solutions, Inc. is an American multinational software and engineering services company based in Santa Clara, California. The company is listed in the Nasdaq stock exchange under the ticker symbol PDFS.
ZK International Group Co., Ltd. is a China-based enterprise focused on the research, development, design, manufacturing and sale of high-quality stainless steel piping systems and fluid transport supporting products. Its offerings cater to construction, municipal infrastructure and residential engineering segments, with core markets spanning China and selected overseas regions.
PDFS vs ZKIN — Head-to-Head
Income Statement — Q4 FY2025 vs Q4 FY2024
| Metric | | |
|---|---|---|
| Revenue | $62.4M | $108.2M |
| Net Profit | $-48.0K | $-2.8M |
| Gross Margin | 72.9% | 6.1% |
| Operating Margin | 5.5% | -1.6% |
| Net Margin | -0.1% | -2.6% |
| Revenue YoY | 24.6% | — |
| Net Profit YoY | -108.9% | — |
| EPS (diluted) | $0.00 | $-0.57 |
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 | $62.4M | — | ||
| Q3 25 | $57.1M | — | ||
| Q2 25 | $51.7M | — | ||
| Q1 25 | $47.8M | — | ||
| Q4 24 | $50.1M | — | ||
| Q3 24 | $46.4M | $108.2M | ||
| Q2 24 | $41.7M | — | ||
| Q1 24 | $41.3M | — |
| Q4 25 | $-48.0K | — | ||
| Q3 25 | $1.3M | — | ||
| Q2 25 | $1.1M | — | ||
| Q1 25 | $-3.0M | — | ||
| Q4 24 | $539.0K | — | ||
| Q3 24 | $2.2M | $-2.8M | ||
| Q2 24 | $1.7M | — | ||
| Q1 24 | $-393.0K | — |
| Q4 25 | 72.9% | — | ||
| Q3 25 | 72.3% | — | ||
| Q2 25 | 71.2% | — | ||
| Q1 25 | 72.9% | — | ||
| Q4 24 | 68.3% | — | ||
| Q3 24 | 73.1% | 6.1% | ||
| Q2 24 | 70.6% | — | ||
| Q1 24 | 67.3% | — |
| Q4 25 | 5.5% | — | ||
| Q3 25 | 8.5% | — | ||
| Q2 25 | 2.2% | — | ||
| Q1 25 | -7.4% | — | ||
| Q4 24 | 1.0% | — | ||
| Q3 24 | 4.6% | -1.6% | ||
| Q2 24 | 0.6% | — | ||
| Q1 24 | -4.7% | — |
| Q4 25 | -0.1% | — | ||
| Q3 25 | 2.3% | — | ||
| Q2 25 | 2.2% | — | ||
| Q1 25 | -6.3% | — | ||
| Q4 24 | 1.1% | — | ||
| Q3 24 | 4.8% | -2.6% | ||
| Q2 24 | 4.1% | — | ||
| Q1 24 | -1.0% | — |
| Q4 25 | $0.00 | — | ||
| Q3 25 | $0.03 | — | ||
| Q2 25 | $0.03 | — | ||
| Q1 25 | $-0.08 | — | ||
| Q4 24 | $0.01 | — | ||
| Q3 24 | $0.06 | $-0.57 | ||
| Q2 24 | $0.04 | — | ||
| Q1 24 | $-0.01 | — |
Balance Sheet & Financial Strength
Snapshot of each company's liquidity, leverage and book value from the latest quarter.
| Metric | | |
|---|---|---|
| Cash + ST InvestmentsLiquidity on hand | $42.2M | $4.1M |
| Total DebtLower is stronger | $67.0M | — |
| Stockholders' EquityBook value | $271.0M | $28.2M |
| Total Assets | $418.7M | $80.0M |
| Debt / EquityLower = less leverage | 0.25× | — |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | $42.2M | — | ||
| Q3 25 | $35.9M | — | ||
| Q2 25 | $40.4M | — | ||
| Q1 25 | $54.1M | — | ||
| Q4 24 | $114.9M | — | ||
| Q3 24 | $120.2M | $4.1M | ||
| Q2 24 | $117.9M | — | ||
| Q1 24 | $122.9M | — |
| Q4 25 | $67.0M | — | ||
| Q3 25 | $67.6M | — | ||
| Q2 25 | $68.1M | — | ||
| Q1 25 | $68.7M | — | ||
| Q4 24 | — | — | ||
| Q3 24 | — | — | ||
| Q2 24 | — | — | ||
| Q1 24 | — | — |
| Q4 25 | $271.0M | — | ||
| Q3 25 | $264.4M | — | ||
| Q2 25 | $257.5M | — | ||
| Q1 25 | $249.0M | — | ||
| Q4 24 | $246.0M | — | ||
| Q3 24 | $240.5M | $28.2M | ||
| Q2 24 | $232.2M | — | ||
| Q1 24 | $225.4M | — |
| Q4 25 | $418.7M | — | ||
| Q3 25 | $406.4M | — | ||
| Q2 25 | $391.1M | — | ||
| Q1 25 | $390.0M | — | ||
| Q4 24 | $315.3M | — | ||
| Q3 24 | $307.4M | $80.0M | ||
| Q2 24 | $298.0M | — | ||
| Q1 24 | $286.8M | — |
| Q4 25 | 0.25× | — | ||
| Q3 25 | 0.26× | — | ||
| Q2 25 | 0.26× | — | ||
| Q1 25 | 0.28× | — | ||
| Q4 24 | — | — | ||
| Q3 24 | — | — | ||
| Q2 24 | — | — | ||
| Q1 24 | — | — |
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 | $17.3M | $-6.9M |
| Free Cash FlowOCF − Capex | $7.5M | $-7.5M |
| FCF MarginFCF / Revenue | 12.1% | -6.9% |
| Capex IntensityCapex / Revenue | 15.7% | 0.6% |
| Cash ConversionOCF / Net Profit | — | — |
| TTM Free Cash FlowTrailing 4 quarters | $-8.6M | — |
8-quarter trend — quarters aligned by calendar period.
| Q4 25 | $17.3M | — | ||
| Q3 25 | $3.3M | — | ||
| Q2 25 | $-5.2M | — | ||
| Q1 25 | $8.6M | — | ||
| Q4 24 | $1.6M | — | ||
| Q3 24 | $9.3M | $-6.9M | ||
| Q2 24 | $684.0K | — | ||
| Q1 24 | $-1.9M | — |
| Q4 25 | $7.5M | — | ||
| Q3 25 | $-2.9M | — | ||
| Q2 25 | $-13.8M | — | ||
| Q1 25 | $535.0K | — | ||
| Q4 24 | $-4.0M | — | ||
| Q3 24 | $5.1M | $-7.5M | ||
| Q2 24 | $-4.6M | — | ||
| Q1 24 | $-3.9M | — |
| Q4 25 | 12.1% | — | ||
| Q3 25 | -5.1% | — | ||
| Q2 25 | -26.6% | — | ||
| Q1 25 | 1.1% | — | ||
| Q4 24 | -8.0% | — | ||
| Q3 24 | 11.0% | -6.9% | ||
| Q2 24 | -11.1% | — | ||
| Q1 24 | -9.4% | — |
| Q4 25 | 15.7% | — | ||
| Q3 25 | 10.8% | — | ||
| Q2 25 | 16.5% | — | ||
| Q1 25 | 17.0% | — | ||
| Q4 24 | 11.3% | — | ||
| Q3 24 | 9.0% | 0.6% | ||
| Q2 24 | 12.8% | — | ||
| Q1 24 | 4.9% | — |
| Q4 25 | — | — | ||
| Q3 25 | 2.54× | — | ||
| Q2 25 | -4.55× | — | ||
| Q1 25 | — | — | ||
| Q4 24 | 2.98× | — | ||
| Q3 24 | 4.20× | — | ||
| Q2 24 | 0.40× | — | ||
| Q1 24 | — | — |
Financial Flow Comparison
Revenue → gross profit → operating profit → net profit for each company.
Revenue Breakdown by Segment
PDFS
| Volumebased | $38.0M | 61% |
| Other | $24.4M | 39% |
ZKIN
Segment breakdown not available.
