AAOI
Applied Optoelectronics, Inc.
AAOI's outlook is improving, though it still trails on the overall score.
PDFS
PDF Solutions, Inc.
PDFS has the edge over AAOI overall, supported by lower modeled downside and stronger valuation.
AAOI Fundamentals
| Metric | Status |
|---|---|
| Strong | |
| Under pressure | |
| Weak | |
| Unavailable |
AAOI's revenue is currently strong, but its profitability and cash flow are under pressure. There isn't enough data to rate its balance sheet.
PDFS Fundamentals
| Metric | Status |
|---|---|
| Healthy | |
| Healthy | |
| Under pressure | |
| Strong |
PDFS's revenue, profitability and balance sheet are currently healthy, but its cash flow is under pressure.
AAOI PE Valuation
AAOI has no meaningful PE right now: it lost money over the past year. If it returns to profit as analysts expect, today's price would be 18x next year's earnings.
PDFS PE Valuation
| Level | PE | Price | Vs current |
|---|---|---|---|
| Forward | 26x | $40.64 | — |
| Current | 107x | $40.64 | — |
| Cheap | 184x | $69.88 | +72% |
| Fair | 405x | $154 | +279% |
| Expensive | 968x | $368 | +805% |
Historical ranges are pointers, not guarantees.
PDFS's PE is in its cheap range at 107x. If earnings grow as analysts expect, today's price would be 26x next year's earnings.
AAOI Forward outlook
| Metric | Outlook |
|---|---|
| -- | |
| Returning to profit | |
| Strong growth | |
| Strongly improving | |
| Limited | |
| Low |
Analysts expect AAOI to return to profit, with revenue growing. However, they disagree widely on these estimates.
PDFS Forward outlook
| Metric | Outlook |
|---|---|
| Strongly improving | |
| Strong growth | |
| Strong growth | |
| Strongly improving | |
| Limited | |
| High |
Analysts expect strong earnings and revenue growth for PDFS, with profitability improving.
AAOI Earnings Per Share
| Quarter | TTM EPS | YoY |
|---|---|---|
| Forward | $2.98 | — |
| Q3 2026 | -$0.42 | +$3.02 |
| Q2 2026 | -$0.77 | +$2.81 |
| Q1 2026 | -$0.65 | +$3.43 |
| Q4 2025 | -$0.64 | +$3.86 |
| Q3 2025 | -$3.44 | -$1.41 |
| Q2 2025 | -$3.58 | -$1.70 |
| Q1 2025 | -$4.08 | -$2.29 |
| Q4 2024 | -$4.50 | -$2.75 |
AAOI is still losing money, but far less than before: $0.42 per share over the past year, against $4.50 at its worst in late 2024.
PDFS Earnings Per Share
| Quarter | TTM EPS | YoY |
|---|---|---|
| Forward | $1.55 | +308% |
| Q3 2026 | $0.38 | +$0.39 |
| Q2 2026 | $0.25 | +1150% |
| Q1 2026 | $0.18 | +500% |
| Q4 2025 | -$0.02 | -120% |
| Q3 2025 | -$0.01 | -108% |
| Q2 2025 | $0.02 | +$0.09 |
| Q1 2025 | $0.03 | -50% |
| Q4 2024 | $0.10 | +25% |
PDFS has the edge over AAOI on earnings quality, reporting a profit while its opponent remains loss making.
AAOI Quarterly Revenue
| Quarter | Revenue | YoY |
|---|---|---|
| Q3 2026 | $269.9M | +127% |
| Q2 2026 | $191.9M | +86% |
| Q1 2026 | $151.1M | +51% |
| Q4 2025 | $134.3M | +34% |
| Q3 2025 | $118.6M | +82% |
| Q2 2025 | $103M | +138% |
| Q1 2025 | $99.9M | +146% |
| Q4 2024 | $100.3M | +66% |
AAOI has the edge over PDFS on sales, with stronger typical year-over-year growth.
| Quarter | Margin | YoY |
|---|---|---|
| Q3 2026 | -0.5% | +15 points |
| Q2 2026 | -13% | +2.6 points |
| Q1 2026 | -8.6% | +0.3 points |
| Q4 2025 | -8.6% | -2.1 points |
| Q3 2025 | -15% | +10 points |
| Q2 2025 | -16% | +45 points |
| Q1 2025 | -8.9% | +44 points |
| Q4 2024 | -6.5% | +1 points |
AAOI's operating margin was −0.5% last quarter, up 15 points from the same quarter a year ago, near the top of its range since 2019.
PDFS Quarterly Revenue
| Quarter | Revenue | YoY |
|---|---|---|
| Q3 2026 | $68.3M | +20% |
| Q2 2026 | $61.5M | +19% |
| Q1 2026 | $60.1M | +26% |
| Q4 2025 | $62.4M | +25% |
| Q3 2025 | $57.1M | +23% |
| Q2 2025 | $51.7M | +24% |
| Q1 2025 | $47.8M | +16% |
| Q4 2024 | $50.1M | +22% |
PDFS's revenue has grown year over year for 23 quarters in a row: $68M last quarter, up 20% from the same quarter a year ago.
| Quarter | Margin | YoY |
|---|---|---|
| Q3 2026 | 12% | +3.7 points |
| Q2 2026 | 8.2% | +6.1 points |
| Q1 2026 | 11% | +18 points |
| Q4 2025 | 5.5% | +2.6 points |
| Q3 2025 | 8.4% | +0.6 points |
| Q2 2025 | 2.2% | -2 points |
| Q1 2025 | -7.4% | -6.8 points |
| Q4 2024 | 2.9% | +2.6 points |
PDFS has the edge over AAOI on profitability, with a higher operating margin.
AAOI Free Cash Flow
| Quarter | Free cash flow | YoY |
|---|---|---|
| Q3 2026 | -$369.9M | -$291.2M |
| Q2 2026 | -$265.3M | -$174.4M |
| Q1 2026 | -$143.6M | -$64.3M |
| Q4 2025 | -$104.6M | -$51.6M |
| Q3 2025 | -$78.7M | -$58M |
| Q2 2025 | -$91M | -$86M |
| Q1 2025 | -$79.3M | -$45.1M |
| Q4 2024 | -$53M | -$48.4M |
AAOI has burned cash in almost every quarter: −$883M over the past year, against −$302M the year before.
PDFS Free Cash Flow
| Quarter | Free cash flow | YoY |
|---|---|---|
| Q3 2026 | -$1.1M | +$1.8M |
| Q2 2026 | $2.3M | +$16.1M |
| Q1 2026 | -$8.8M | -1745% |
| Q4 2025 | $7.6M | +$11.5M |
| Q3 2025 | -$2.9M | -158% |
| Q2 2025 | -$13.8M | -$9.1M |
| Q1 2025 | $535K | +$4.4M |
| Q4 2024 | -$4M | -$3.3M |
PDFS has the edge over AAOI on cash flow, with more consistent year-over-year improvement.
AAOI Total Shares
| Period | Change % | Net change |
|---|---|---|
| Quarterly | +7.7% | +6.3M shares |
| 1 year | +39% | +24.5M shares |
| 3 years | +168% | +55.1M shares |
| 5 years | +224% | +60.7M shares |
| Available history | +340% | +67.9M shares |
AAOI has 88M diluted shares, up 39% from a year ago.
PDFS Total Shares
| Period | Change % | Net change |
|---|---|---|
| Quarterly | +2.9% | +1.2M shares |
| 1 year | +8.5% | +3.4M shares |
| 3 years | +13% | +4.8M shares |
| 5 years | +15% | +5.8M shares |
| Available history | +33% | +10.6M shares |
PDFS has the edge over AAOI on shareholder dilution, with a more favorable share count trend.
| Quarter | Spent |
|---|---|
| Q4 2025 | — |
| Q3 2025 | $244,000 |
| Q4 2024 | — |
| Q3 2024 | — |
| Q2 2024 | — |
| Q1 2024 | $6.9M |
| Q4 2023 | — |
| Q4 2022 | — |
AAOI Net Leverage
AAOI's operating earnings (EBITDA) were negative over the past year, so its debt can't be measured against them.
PDFS Net Leverage
| Quarter | Net Leverage | Status |
|---|---|---|
| Q3 2026 | -1.4x | Net Cash |
| Q2 2026 | -1.9x | Net Cash |
| Q1 2026 | 1.7x | Healthy |
| Q4 2025 | 2.5x | Moderate |
| Q3 2025 | 4.4x | High |
| Q2 2025 | 5.4x | High |
| Q1 2025 | 3.8x | Elevated |
| Q4 2024 | -8.9x | Net Cash |
PDFS has more cash than debt.
AAOI Weekly Momentum
| Metric | Value | Status |
|---|---|---|
| RSI | 35.1 | Neutral |
| Stochastic | 4.8 | Oversold |
AAOI's weekly RSI is 35 (neutral) and its Stochastic is 5 (oversold).
PDFS Weekly Momentum
| Metric | Value | Status |
|---|---|---|
| RSI | 45.0 | Neutral |
| Stochastic | 22.2 | Neutral |
PDFS's weekly RSI is 45 (neutral) and its Stochastic is 22 (neutral).
AAOI PE vs Technology Sector
AAOI has no meaningful PE right now: it lost money over the past year.
PDFS PE vs Technology Sector
| Metric | PDFS | Sector median | Relative |
|---|---|---|---|
| PE | 107x | 28x | 284% above |
| PE % | 1 | 35 | 34 pts below |
PDFS is trading at 107x earnings, a 284% premium to the Technology sector's median of 28x.
AAOI Weekly Moving Averages
| Moving average | MA price | Relative |
|---|---|---|
| 8 week MA | $80.2 | 34% below |
| 20 week MA | $100.6 | 47% below |
| 50 week MA | $100.3 | 47% below |
| 100 week MA | $62.3 | 15% below |
| 200 week MA | $36.9 | 43% above |
AAOI has fallen below most of its moving averages, though it's still 43% above its 200-week average.
PDFS Weekly Moving Averages
| Moving average | MA price | Relative |
|---|---|---|
| 8 week MA | $44.7 | 9% below |
| 20 week MA | $47.4 | 14% below |
| 50 week MA | $42.6 | 4.6% below |
| 100 week MA | $32.7 | 24% above |
| 200 week MA | $33.6 | 21% above |
PDFS has the edge over AAOI on trend strength, trading above more of its moving averages.
AAOI Yearly ROI
| Year | Start price | End price | ROI |
|---|---|---|---|
| 2020 | $11.5 | $8.77 | -24% |
| 2021 | $8.77 | $5.64 | -36% |
| 2022 | $5.64 | $1.95 | -65% |
| 2023 | $1.95 | $19.3 | +891% |
| 2024 | $19.3 | $37.7 | +95% |
| 2025 | $37.7 | $37.2 | -1.5% |
| 2026 YTD | $37.2 | $52.9 | +42% |
AAOI has the edge over PDFS on returns for 2026, with the stronger performance.
PDFS Yearly ROI
| Year | Start price | End price | ROI |
|---|---|---|---|
| 2020 | $16.5 | $22.0 | +34% |
| 2021 | $22.0 | $31.3 | +42% |
| 2022 | $31.3 | $28.6 | -8.9% |
| 2023 | $28.6 | $32.1 | +13% |
| 2024 | $32.1 | $27.9 | -13% |
| 2025 | $27.9 | $29.3 | +5.1% |
| 2026 YTD | $29.3 | $40.6 | +39% |
PDFS has finished higher in four of the last six years. It's up 39% so far in 2026.