Best Small-Cap AI Infrastructure Stocks — May 2026 Update
7 small-cap AI infrastructure stocks for April 2026, ranked on balance sheet, cash, and growth. Chip IP, networking, LiDAR, memory — real fundamentals.
May 2026 update: the AI-infrastructure rerating continues — hyperscaler capex guidance for calendar 2026 was raised by all four megacaps in their Q1 prints (late-April releases), and the downstream small-cap suppliers in chip IP, optical interconnect, and memory are now ~3-6 months into that capex flowing through revenue. Our model re-scored the universe May 1; the seven names below remain the top-scoring AI-infrastructure small-caps but four show meaningful score improvement since April. We've also added an Edge AI breakout and a new Photonics/Optical Interconnect view linked at the bottom — both have shown specific search-intent in May.
AI infrastructure is the picks-and-shovels play on the AI build-out. Not the models (OpenAI, Anthropic), not the hyperscalers (MSFT, GOOG). The hardware underneath: chips, IP, memory, optical interconnect, test equipment, perception sensors. NVIDIA takes the headlines. Small-caps offer targeted exposure — with much higher score variance.
We scored every small-cap stock in our universe (market cap <$2B) across semiconductors, semi equipment, electronic components, and hardware. Here are the 7 highest-scoring AI infrastructure names for April 2026.
Why Small-Cap AI Infrastructure Is Different
Four things separate these names from generic semis:
- Cycle sensitivity — semi and hardware plays swing harder than most sectors. A small-cap that triples on an AI tailwind can halve on an inventory correction
- Customer concentration — many supply a handful of fabless chip makers or OEM customers. Losing one is material
- Capex intensity — names tied to fab or test equipment need strong balance sheets to survive down-cycles
- AI exposure varies — not every semi is an AI semi. We flag pure plays vs tangential
Key scoring angles: revenue growth quality (recurring vs one-time), gross margin (IP-rich vs commodity), cash runway (can they fund R&D without dilution), insider ownership (founder-led vs diffuse).
Top 7 Small-Cap AI Infrastructure Stocks by Fundamental Score — April 2026
Get picks like these first.
Free weekly digest — top movers, score changes, new small-cap opportunities. No spam, unsubscribe anytime.
1. Aeluma (ALMU) — Score: 82.8 | Grade: EXCELLENT
| Metric | Value | Score |
|---|---|---|
| Revenue Growth YoY | +407.6% | 100 |
| Gross Margin | 59.6% | 83 |
| Cash Runway | 38 months | 78 |
| Debt/Equity | 5.3 | 92 |
| P/S Ratio | 55.5x | 15 |
| Rule of 40 | 361.7 | 100 |
| Insider Ownership | 24.7% | 95 |
| 12m Dilution | +14.3% | 45 |
What drives the score: Quantum-dot photonic integrated circuits — optical components for AI datacenter interconnect, defense sensing, and space communications. Revenue growth of +408% YoY from a small base. Insider ownership at 25% is rare alignment for a semiconductor name. Gross margin at 60% confirms it's an IP-heavy play, not contract manufacturing.
Red flags: P/S of 55x means the market has priced the optimism aggressively. 14% share count increase in the last 12 months shows they're still funding the build-out via equity, not cash flow.
Market cap: $290M. Industry: Semiconductors.
2. M-tron Industries (MPTI) — Score: 72.0 | Grade: SOLID
| Metric | Value | Score |
|---|---|---|
| Revenue Growth YoY | +19.1% | 30 |
| Gross Margin | 46.2% | 65 |
| Cash Runway | Profitable | 100 |
| Debt/Equity | 0 | 100 |
| P/S Ratio | 3.5x | 87 |
| Rule of 40 | 38.2 | 76 |
| Insider Ownership | 7.5% | 50 |
| 12m Dilution | +0.6% | 98 |
What drives the score: RF and microwave components for defense, aerospace, and data center networking. Zero debt, profitable, 19% YoY growth. Rule of 40 at 38 is healthy for a hardware name. Negligible dilution — they're growing on cash flow, not on raising.
Red flags: Insider ownership is moderate (7.5%) and growth is slower than pure-AI names. The AI linkage is indirect — high-frequency RF matters for optical networking and emerging AI cluster interconnect, but MPTI's revenue mix is still majority defense.
Market cap: $186M. Industry: Electronic Components.
3. MaxLinear (MXL) — Score: 70.7 | Grade: SOLID
| Metric | Value | Score |
|---|---|---|
| Revenue Growth YoY | +29.7% | 52 |
| Gross Margin | 56.8% | 80 |
| Cash Runway | Profitable | 100 |
| Debt/Equity | 32.1 | 60 |
| P/S Ratio | 3.2x | 90 |
| Rule of 40 | 7.8 | 31 |
| Insider Ownership | 6.7% | 45 |
| 12m Dilution | +0.1% | 99 |
What drives the score: Mixed-signal chips for broadband, wireless, optical, and infrastructure. Coming out of a deep 2024 downturn — 30% YoY growth, 57% gross margin, healthy balance sheet. The AI angle is optical connectivity for datacenter scale-out.
Red flags: Rule of 40 at 7.8 is weak because growth hasn't translated to operating margin recovery yet. Insider ownership is diffuse. Watch the next two quarters — if operating margin doesn't expand with revenue, the recovery thesis breaks.
Market cap: $1.48B. Industry: Semiconductors.
Still reading? Get the full weekly rundown.
Every Monday: fresh score changes, new names crossing 80+, and context you won't find in the screener.
4. Arteris (AIP) — Score: 68.2 | Grade: SOLID
| Metric | Value | Score |
|---|---|---|
| Revenue Growth YoY | +22.3% | 35 |
| Gross Margin | 90.2% | 100 |
| Cash Runway | Profitable | 100 |
| Debt/Equity | -40.8 (net cash) | 100 |
| P/S Ratio | 10.1x | 68 |
| Rule of 40 | -24.7 | 0 |
| Insider Ownership | 27.0% | 96 |
| 12m Dilution | +9.8% | 55 |
What drives the score: Network-on-Chip (NoC) IP. Their interconnect technology powers SoC designs at dozens of fabless AI chip makers. Highest gross margin in the list at 90% — it's IP licensing, not fab. Net cash balance sheet. 27% insider ownership is the strongest alignment signal in this list.
Red flags: Rule of 40 is negative because they're still in operating-loss territory, building the licensing revenue tail. 10% share dilution in 12m. If enterprise AI chip design slows (tariff risk, China competition), their licensing tail gets hit.
Market cap: $710M. Industry: Semiconductor IP.
5. inTest Corporation (INTT) — Score: 63.7 | Grade: SOLID
| Metric | Value | Score |
|---|---|---|
| Revenue Growth YoY | +6.0% | 10 |
| Gross Margin | 42.4% | 60 |
| Cash Runway | Profitable | 100 |
| Debt/Equity | 26.1 | 68 |
| P/S Ratio | 1.6x | 97 |
| Rule of 40 | 8.6 | 33 |
| Insider Ownership | 13.5% | 72 |
| 12m Dilution | +0.2% | 99 |
What drives the score: Thermal and test solutions for semiconductor manufacturers. Every AI chip needs test and thermal management — this is the indirect-but-durable exposure. Profitable, low P/S, essentially no dilution. 13.5% insider ownership is healthy.
Red flags: 6% YoY growth is pedestrian. Rule of 40 is weak. This is a defensive, value-tilted play on AI capex — not a growth bet. If you want torque, look elsewhere.
Market cap: $182M. Industry: Semiconductor Equipment.
6. Ouster (OUST) — Score: 63.2 | Grade: SOLID
| Metric | Value | Score |
|---|---|---|
| Revenue Growth YoY | +52.5% | 74 |
| Gross Margin | 49.3% | 70 |
| Cash Runway | 20 months | 45 |
| Debt/Equity | 6.5 | 90 |
| P/S Ratio | 9.2x | 70 |
| Rule of 40 | 8.8 | 34 |
| Insider Ownership | 4.3% | 25 |
| 12m Dilution | +16.8% | 38 |
What drives the score: Digital LiDAR for robotaxis, industrial automation, and smart infrastructure. 52% revenue growth, 49% gross margin, margins improving. Pure AI-perception exposure.
Red flags: 20-month runway means another raise is coming. Only 4.3% insider ownership. 17% dilution in the last 12m is material. This is a "survive to thrive" name — if the autonomous buildout accelerates before they burn through cash, great. If it slows, dilution gets worse.
Market cap: $1.56B. Industry: Electronic Components.
7. Everspin Technologies (MRAM) — Score: 61.9 | Grade: SOLID
| Metric | Value | Score |
|---|---|---|
| Revenue Growth YoY | +9.5% | 17 |
| Gross Margin | 51.2% | 74 |
| Cash Runway | Profitable | 100 |
| Debt/Equity | 4.8 | 92 |
| P/S Ratio | 3.8x | 85 |
| Rule of 40 | -2.3 | 0 |
| Insider Ownership | 6.0% | 40 |
| 12m Dilution | +3.4% | 75 |
What drives the score: MRAM (magnetoresistive RAM) — non-volatile memory used in industrial, aerospace, and increasingly edge-AI applications where you need fast, power-efficient, radiation-tolerant memory. Profitable, clean balance sheet, reasonable P/S.
Red flags: 10% growth is slow. Rule of 40 is slightly negative — margin pressure. This is a defensive niche play, not a growth bet. The edge-AI memory market is real but small and fragmented.
Market cap: $212M. Industry: Semiconductors.
The Honest Caveat: Our Backtest
We don't publish scores without saying what they've delivered. Our Top 20 portfolio, rebalanced quarterly, has delivered +52.9% cumulative alpha over the Russell 2000 across 5 quarters — but only at the $100k daily-volume threshold, which is where retail portfolios of $3k–$15k actually trade.
At $500k daily volume (portfolios around $30k–$100k), the edge shrinks to near zero. At $1M (serious retail, $100k+), the edge disappears.
Of these 7 picks: MXL, OUST, and AIP trade with real liquidity. ALMU, MPTI, INTT, and MRAM are thinner. Size your positions accordingly. Full methodology at /track-record.
Risks Worth Knowing
- Tariff and export-control risk — AI chips, quantum, and photonic tech are squarely in the crosshairs of US-China policy. A single rule change can cut revenue overnight for names with China exposure
- Customer concentration — AIP licenses to dozens; ALMU and MPTI sell to a handful. Check the 10-K customer-concentration disclosures before sizing up
- Dilution as the hidden cost — ALMU +14%, OUST +17%, AIP +10% in the last 12 months. Growth is real, but so is the share count creep
- Small-cap liquidity — anything under $200M market cap here should be sized assuming you can't exit fast
How We Scored
Every stock gets 0–100 based on 8 equal-weight fundamentals: revenue growth, gross margin, cash runway, debt/equity, P/S ratio, Rule of 40, insider ownership, and 12-month dilution. Sector-adjusted where appropriate. Scores refresh weekly.
Want to see the full list? Browse all 282 small-cap technology stocks in our scanner, or check the top 20 highest-scoring small-caps right now.
Data as of April 19, 2026. Updated monthly. Past performance does not guarantee future results.
Related May 2026 Coverage
- Edge AI Small-Caps (May 2026)
- Quantum Computing Small-Caps (May 2026)
- AI Photonics & Optical Interconnect (June 2026)
Updated May 15, 2026. All scores reflect the May 1 snapshot against 2,200+ US small-caps.