Case todayBrokenInsider-selling cluster · Sep 24, 2026The case · strengthening · Sep 11, 2026Own ANET if cloud and AI customers keep choosing Arista’s Ethernet platform, while enterprise and campus expansion broadens growth beyond the biggest data-center build cycles.6 conditions3 strengthening · 3 holdingNext resultsFeb 11, 2027Projected from its filing dates

ANET at a glance

The past year

Chart

+46.2% $197.34, close Nov 13

From the highest close
−9.0%
Vs the 200-day average
+17.9%
Nov 12, 2025Daily close, Arista NetworksNov 13, 2026

Short interest

History

12.0M shares

Of shares outstanding
0.95%
Since the last report
−1.4%
Days to cover
1.9 days
Settled
Oct 30, 2026

Congress and officials

Trades

3 trades, 90 days

Buys / sells
2 / 1
Filers
3

Insider buying, 7 days

Filings

None filed this week

Form 4s filed
Nov 8 – Nov 14

Top investors

Funds

2 of 37 funds hold it

Ray Dalio
0.2%
Maverick Capital
0.0%
Latest 13F filings
1 added · 1 cut

Understand the Business

  • Customers buy Ethernet switching and routing platforms, network applications and support for large AI, data-center, campus and routing environments; product sales remain the primary revenue engine.↗
  • Arista captures value by bundling hardware with EOS software, applications and CloudVision, so customers pay for a managed networking platform rather than only ports and boxes.↗

Why the Stock Moved

  • October 2023 · Outlook reset higher: Growth looked less constrained by supply normalization. Arista cited strong enterprise and cloud/AI momentum and lifted 2023 revenue-growth outlook above 33%. That improved near-term earnings confidence.↗
  • November 2024 · Meta AI validation: AI networking looked more customer-validated. Arista reported 20.0% revenue growth and highlighted Meta Etherlink engineering collaboration. Named AI work supported longer growth confidence.↗↗

ANET price history

Latest price$197.29Today−$9.34 (-4.52%)
ANET +0.80%S&P 500 -2.05%Since first plotted close
4 hours

Loading recent earnings…

Investment thesis

What must happen next

6 MATERIAL PROPOSITIONS
  • Large AI customers must keep using Ethernet networks where Arista can win designs against vertically integrated and specialized alternatives.StrengtheningMateriality: High

    Arista highlighted Meta Etherlink collaboration, while its 10-K says growth depends partly on future Ethernet deployment in AI networks. If Ethernet becomes a preferred AI networking layer, Arista’s addressable demand can extend beyond ordinary data-center refresh cycles.

    Watch: Watch whether named AI collaborations turn into repeat deployments and whether Nvidia, Cisco or white-box systems displace Arista designs.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    We are thrilled with the close engineering collaboration with Meta for the new era of AI.

    Open source ↗

    Our cloud networking solutions consist of our EOS, a set of network applications and our Ethernet switching and routing platforms.

    Open source ↗
  • Cloud, AI and data-center customers must keep expanding network capacity rather than pausing capital spending after large buildouts.StrengtheningMateriality: High

    Revenue rose from $1.509 billion in Q3 2023 to $3.036 billion in Q2 2026 across the eligible earnings releases. Arista sells into major infrastructure buildouts, so customer capital-spending decisions directly affect revenue visibility and inventory risk.

    Watch: Watch management commentary on cloud and AI demand, revenue guidance, deferred revenue volatility and signs of customer deployment pauses.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    Customer momentum remained strong in both enterprise and cloud/AI sectors.

    Open source ↗

    Revenue of $3.036 billion, an increase of 12.1% compared to the first quarter of 2026

    Open source ↗
  • EOS, network applications and CloudVision must keep making Arista hardware operationally easier to run than cheaper substitutes over time.HoldingMateriality: High

    The 10-K describes cloud networking solutions built from EOS, network applications, and Ethernet switching and routing platforms. Software consistency can make customers value reliability and operations, not just hardware price per port.

    Watch: Watch customer satisfaction evidence, support quality, software attach, and whether open network operating systems narrow Arista’s operational gap.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    Our cloud networking solutions consist of our EOS, a set of network applications and our Ethernet switching and routing platforms.

    Open source ↗
  • Cisco, Nvidia, white-box vendors and system suppliers must not bundle or integrate alternatives that erode Arista design wins.HoldingMateriality: High

    The 10-K names Cisco, Nvidia, white-box vendors and others as competitors, and says vertically integrated solutions may intensify competition. If rivals bundle compute, networking and software more effectively, Arista could lose share or accept lower margins.

    Watch: Watch competitive wins, pricing pressure, customer standardization decisions, and whether integrated AI systems reduce demand for standalone Ethernet switching.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    Our cloud networking solutions consist of our EOS, a set of network applications and our Ethernet switching and routing platforms.

    Open source ↗
  • Campus, wireless, security and software/service adjacencies must add growth without distracting engineering and support from core switching and routing.HoldingMateriality: Medium

    The 10-K says Arista invests in campus, Wi-Fi, enterprise routing, network security and software-defined wide-area networking, but has less experience there. Adjacencies can diversify the revenue base, but unfamiliar markets may bring longer sales cycles, more support burden and weaker win rates.

    Watch: Watch campus and enterprise customer wins, software/service mix, sales productivity, and signs that support complexity rises.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    Our cloud networking solutions consist of our EOS, a set of network applications and our Ethernet switching and routing platforms.

    Open source ↗
  • Rising revenue must continue converting into high operating margins, not just larger product shipments with weaker mix or higher expense.StrengtheningMateriality: High

    Q2 2026 non-GAAP operating margin was 49.9%; in October 2023, management’s Q4 2023 non-GAAP operating-margin outlook was about 42%. The stock needs profitable scaling; weaker mix, discounting, component costs or higher operating expense would reduce earnings power.

    Watch: Watch gross margin, non-GAAP operating-margin guidance, product/service mix, competitive pricing, inventory charges and operating-expense growth.

    Supporting sources

    Source notes are factual paraphrases; read the original disclosures below.

    Customer momentum remained strong in both enterprise and cloud/AI sectors.

    Open source ↗

    Revenue of $3.036 billion, an increase of 12.1% compared to the first quarter of 2026

    Open source ↗
Full investment case & evidence

Loading the original research archive…

Original research

Large AI customers must keep using Ethernet networks where Arista can win designs against vertically integrated and specialized alternatives. If Ethernet becomes a preferred AI networking layer, Arista’s addressable demand can extend beyond ordinary data-center refresh cycles.

Cloud, AI and data-center customers must keep expanding network capacity rather than pausing capital spending after large buildouts. Arista sells into major infrastructure buildouts, so customer capital-spending decisions directly affect revenue visibility and inventory risk.

EOS, network applications and CloudVision must keep making Arista hardware operationally easier to run than cheaper substitutes over time. Software consistency can make customers value reliability and operations, not just hardware price per port.

Cisco, Nvidia, white-box vendors and system suppliers must not bundle or integrate alternatives that erode Arista design wins. If rivals bundle compute, networking and software more effectively, Arista could lose share or accept lower margins.

Campus, wireless, security and software/service adjacencies must add growth without distracting engineering and support from core switching and routing. Adjacencies can diversify the revenue base, but unfamiliar markets may bring longer sales cycles, more support burden and weaker win rates.

Rising revenue must continue converting into high operating margins, not just larger product shipments with weaker mix or higher expense. The stock needs profitable scaling; weaker mix, discounting, component costs or higher operating expense would reduce earnings power.

All standing thesis claims
Original report summary

cloud and AI customers keep choosing Arista’s Ethernet platform, while enterprise and campus expansion broadens growth beyond the biggest data-center build cycles.

Evidence assessed Sep 11, 2026. Expand each conclusion for its evidence and what would change it. Thesis evidence—not a buy or sell recommendation.

Since this case

What has happened since Sep 11, 2026

The case above was written from evidence through Sep 11, 2026 and stays as written. This part is read from SEC filings and closing prices each time the page is built, so it moves as new reports are filed.

Results
Q3 2026, the quarter to Sep 30, 2026, reported Nov 3, 2026 (8-K ↗): revenue $3.66B, up 58.5% on the same quarter a year earlier; net income $1.56B. Over the 12 months to Sep 30, 2026: revenue $11.89B, net income $4.75B (40.0% of revenue).
Share price
-1.1% since Sep 11, 2026, from $199.59 to $197.34 on Nov 13, 2026. The stock alone, not measured against other companies.
Filings
1 8-K filing since Sep 11, 2026:
Insiders
At least 40 insider transactions reported since Sep 11, 2026, more than this section totals. Every one is in the SEC’s list of its Form 4 filings ↗.
Conditions
None of the conditions the Thesis-Break Engine checks has crossed on Arista Networks since Sep 11, 2026.

Read from SEC filings and closing prices through Nov 14, 2026. A filing made today can take up to about four hours to appear here.

Bull case and bear case

Bull case and bear case for Arista Networks, Inc.

Where the evidence on Arista Networks stands: Strengthening on the latest evidence (Sep 11, 2026). Of its 6 thesis points, 3 strengthening and 3 holding.

Bull case: what the evidence supports

Bear case: what would count against it

Thesis-Break Engine

What has broken in Arista Networks’s thesis

Each break OptimistFi flagged on Arista Networks, dated — with what has historically followed the same kind of break across the market, not a forecast for Arista Networks.

peers+15%-13%+1%12 mo agonow+6 mo
Daily price, then where similar breaks led across the market: the typical +1% path vs comparable companies over six months, inside the middle-half range (+15% to -13%). A base rate, not a forecast.
  • Insider-selling clustercondition set before this filing

    Across all companies, this kind of break has happened 9,137 times before. Those stocks beat comparable companies by a median of 1% over the next six months, and 30% of them trailed it by 10 points or more.

How the Thesis-Break Engine works →Historical outcomes are measured against comparable companies after past breaks of the same kind, across all companies. Not a prediction.

MARKET + FINANCIAL SNAPSHOT

The numbers behind the thesis

Sourced from filings and market data

What Changed

  1. Supportive
    Q2 2026 revenue crossed $3 billion

    Arista reported its first $3 billion-plus revenue quarter and guided Q3 revenue to about $3.3 billion, testing whether large AI and enterprise demand can keep scaling with high operating margins.

  2. Mixed
    Margins improved, but the next-quarter guide is lower

    Arista’s non-GAAP operating margin rose to 49.9% from 48.8% a year earlier. Management guided the next quarter to 48–49%, so the thesis needs profitable growth—not an assumption that margins keep expanding.

Risks / falsifiers

What could break the thesis

  • Watch whether named AI collaborations turn into repeat deployments and whether Nvidia, Cisco or white-box systems displace Arista designs.
  • Watch management commentary on cloud and AI demand, revenue guidance, deferred revenue volatility and signs of customer deployment pauses.
  • Watch customer satisfaction evidence, support quality, software attach, and whether open network operating systems narrow Arista’s operational gap.
  • Watch competitive wins, pricing pressure, customer standardization decisions, and whether integrated AI systems reduce demand for standalone Ethernet switching.
  • Watch campus and enterprise customer wins, software/service mix, sales productivity, and signs that support complexity rises.
  • Watch gross margin, non-GAAP operating-margin guidance, product/service mix, competitive pricing, inventory charges and operating-expense growth.

ANET news

Loading headlines…

Financial statements

ANET income statement

Annual filed results · USD · Oldest to newest. Margins are calculated from the reported figures.

ANET: quick answers

When does Arista Networks (ANET) report earnings next?
Arista Networks's next results are projected for February 11, 2027, from the dates of its own results filings with the SEC. The company has not confirmed the date. It last reported on November 3, 2026. Earnings calendar
What is ANET's short interest?
As of October 30, 2026, 12.0M ANET shares were sold short, 0.95% of its shares outstanding, down 1.4% from the count before. At the stock's average daily volume that is 1.9 days to cover. FINRA publishes the count twice a month. ANET short interest history
Have members of Congress traded ANET?
Reports made public in the last 90 days disclose 3 trades in ANET by 3 filers: 2 purchases and 1 sale. They are filed under the STOCK Act by members of Congress, the President and senior officials. Every disclosed ANET trade
Which well-known investors own ANET?
2 of the 37 well-known funds tracked here reported ANET shares in their latest 13F filings. By share of the fund's portfolio: Bridgewater Associates (Ray Dalio), 0.2%; Maverick Capital, 0.0%. Fund portfolios

ANET in well-known investors’ portfolios

2 of 37 funds reported ANET shares in their latest 13F filing. A 13F shows quarter-end positions and arrives up to 45 days later.

FundOf its portfolioValueChangeQuarter
Ray DalioBridgewater Associates0.18%$43.2M−80.9%Q2 2026
Maverick Capital0.01%$1.2MNewQ2 2026

Every fund’s portfolio

ScoutJUST THIS STORY

LET’S MAKE THIS USEFUL · 1 OF 5

How would you like me to explain this?

Tell me what you want from this read. Start with a quick note, then adjust the details. Your other stories stay as they are.

We’ll remember your view of this story. The published article stays unchanged.

THIS STORY’S READING VIEWStandard · The whole picture

Clear explanations with context. Both sides of the evidence.