Arista Networks, Inc.

Arista Networks, Inc. (ANET) — Investment Memo

🐂 The Bull Case (Warren's voice)

• Moat is real and widening. EOS software creates switching costs that deepen as hyperscalers automate – ripping out Arista APIs would cost years and billions. Net margin expanded from 16.3% to 39.0% while revenue grew 8×; that’s pricing power in action.
• Economics are exceptional. Zero debt, ROE 28.4%, net income grew 17× on 8× revenue. Incremental returns on capital are rising – a textbook franchise.
• Attractive entry only if FCF is proven. The DCF at $73.6B (~$58.58/share) assumes 8% FCF growth, 10% discount, 3% terminal. If FCF mirrors net income (highly likely from pre-2020 data), that intrinsic value is conservative. Berkshire would find the business interesting below $44/share (25% margin of safety) and ideally $29/share (50% safety). At current prices (likely well above $100), it’s a WATCH, not a BUY.

🐻 The Bear Case (Charlie inverts)

• Hyperscaler vertical integration. The single structural threat: Amazon, Google, or Microsoft builds its own switches at cost. Arista’s pricing power evaporates. Given reseller concentration (two resellers flagged in 10‑K), a single defection could slash revenue 30-50%.
• Accounting alchemy on 39% net margin. Networking hardware peers (Cisco, Juniper) run 15-25% net margins. 39% is either a monopoly moat or aggressive revenue recognition / one‑time gains. FCF data is missing after 2019 – the most important number. If cash conversion is poor (e.g., deferred revenue buildup or receivables stretching), the moat is thinner than it looks.
• Management trust deficit. No share count disclosed, no insider ownership shown, no straight talk on FCF. Brilliant operators hiding the cash flow book – that’s a permanent impairment risk if the hidden numbers are worse than NI.

Most likely threat: Hyperscaler build‑out over the next 5–7 years. Arista’s 29% revenue growth in 2025 may already be decelerating as custom silicon gains traction.

💰 Valuation & Margin of Safety

• Intrinsic value estimate: $58.58/share (DCF, 8% FCF growth, 10% discount, 3% terminal). This assumes FCF equals net income – a leap of faith given missing data.
• 25% margin of safety entry: $44/share
• 50% margin of safety entry: $29/share (Buffett’s ideal – rarely reached for quality)
• Current price: Not provided, but given market context (ANET trades >$100), it is expensive by ~70-100% vs intrinsic. No margin of safety.

Verdict: WATCH

The business is structurally brilliant, but the missing FCF data and 39% net margin in a hardware business are unresolved red flags; we cannot pay a premium for trust we don’t have. If the stock ever drops below $44/share and Arista releases clean cash flow statements, this becomes a BUY. Until then, patient inversion wins.