Arista Networks, Inc.

The full register, from 13F filings

The Register tab above is hand research: a dozen holders, each traced to the filing it came from. This asks the same question of the whole market for the quarter ended 31-mar-2026, where 1,982 managers reported a position. Broad where the research is deep, and shallow in the ways a 13F always is.

Built from 13F filings, which report US listed, long, US custodied positions only. A register from this source is a floor rather than a level: a holder's true position can be far larger, as BlackRock's ASML stake shows at 1.28m shares in a 13F against 26.3m in its 13G/A. Holdings held through derivatives, outside US custody, or below a manager's reporting obligation do not appear. Where a holder is marked as a family, its total sums several separate filing entities and describes something no single filing describes; the constituent entities and their share counts are listed so the total can be checked. That roll-up can legitimately exceed the family's own Schedule 13G, because a 13G is filed by one legal entity: Vanguard reports Alphabet through ten advisory entities, and The Vanguard Group Inc itself reported zero after its January 2026 disaggregation.

What a reader needs to know to read these numbers

• Arista executed a four-for-one forward stock split announced 7 November 2024 and effected 3 December 2024 via a certificate amendment. Every filing used in this file (13F filings dated Dec 2025 and Jun 2026, the DEF 14A filed 16 April 2026, the FY2025 10-K filed 17 February 2026, and the Q2 FY2026 10-Q filed 5 August 2026) postdates the split and already reports actual post-split share counts, so no restatement arithmetic was required for any row here.
• company.shares_outstanding (1,261,224,648) is the cover-page figure from the Q2 FY2026 10-Q (period ended 30 June 2026, filed 5 August 2026), stated 'as of July 30, 2026'. The FY2025 10-K balance sheet separately reports 1,256.5 million shares issued and outstanding as of 31 December 2025, rounded to one decimal in the filing; this rounded figure (1,256,500,000) is the denominator used only for the Vanguard 13F row, whose period of report is 31 December 2025.
• market_cap_usd ($250.76bn) is macrotrends.net's stated figure 'as of August 14, 2026', cross-checked by multiplying the regularMarketPrice from Yahoo Finance's chart API for ANET at the same timestamp ($198.82) by shares_outstanding (1,261,224,648), which yields $250,756,684,515, matching macrotrends to the nearest ten million.
• Arista's own EDGAR filing history (submissions JSON for CIK 0001596532, checked 17 August 2026) contains no 13F-HR or 13F-NT of any vintage: Arista does not act as an institutional investment manager, matching the Broadcom precedent.
• Holdings is empty and that is a sourced finding, not a gap. The FY2025 10-K (period ended 31 Dec 2025, filed 17 Feb 2026) and the Q2 FY2026 10-Q (period ended 30 Jun 2026, filed 5 Aug 2026) were both searched for 'equity method', 'non-marketable', 'measurement alternative', 'strategic investment', 'privately held' and 'equity investment'. Neither filing names an investee or a per-company dollar figure. The FY2025 10-K states only, in a risk factor, that 'the privately held companies in which we invest are in the startup or development stages', with no size or count.
• The most recent SOURCED dollar figure for Arista's non-marketable equity investments in privately-held companies is a COMBINED balance: $81,316 thousand ($81.3 million) as of 31 December 2024, versus $62,288 thousand ($62.3 million) as of 31 December 2023, per the FY2024 10-K (filed 19 Feb 2025), Item 7A and Note 2, Fair Value Measurements. That 10-K states the balance covers Arista's evaluation of investments in '68 privately-held companies' in aggregate under the ASC 321 measurement alternative (cost of $38,284 thousand plus cumulative upward adjustments of $43,032 thousand, no impairments). Because this is one combined balance across roughly 68 unnamed investees with no per-company split disclosed anywhere searched, no individual holding is recorded here per the brief's rule against distributing a bucket or naming investees from memory; the bucket total is recorded here and in unknowns instead.
• The FY2025 10-K (filed 17 Feb 2026, the most current annual report as of this research) no longer repeats the 'Strategic Equity Investments' paragraph or the cost/carrying-amount table that appeared in the FY2024 10-K's Item 7A and Note 2. Item 7A of the FY2025 10-K mentions 'strategic equity investments' only in a single generic sentence about market risk exposure, with no dollar figure. This looks like a disclosure simplification (the FY2025 10-K's Note on long-lived assets by geography explicitly EXCLUDES 'investments in privately-held companies' from its table), not evidence the investments were disposed of.
• The Bechtolsheim Family Trust is the Walton/Walmart case flagged in the brief: Andy Bechtolsheim, co-founder and Chief Architect, is NOT listed among the proxy's 'Named Executive Officers and Directors' (he does not appear on the current board or NEO list at all in the 16 April 2026 DEF 14A) and his trust is listed only under '5% Stockholders'. His 183,799,896-share stake is therefore recorded here as a standalone insider row with NO rolls_up_into: it is confirmed excluded from 'All current executive officers and directors as a group (11 persons)' both by the proxy's own table structure and by the arithmetic (the aggregate's 33,474,360 shares equals the sum of the 12 individually named NEO/director rows exactly, leaving no room for Bechtolsheim's 183.8 million shares).
• Jayshree Ullal (CEO) and Kenneth Duda (co-founder, director) ARE both listed under 'Named Executive Officers and Directors' and both roll up into the 'All current executive officers and directors as a group (11 persons)' aggregate row; do not sum those two rows with the aggregate.
• BlackRock disagreement, recorded rather than resolved. The register uses BlackRock, Inc.'s own Form 13F-HR for the quarter ended 30 June 2026 (CIK 0002012383): 91,383,843 shares. Arista's 16 April 2026 proxy separately reports BlackRock at 73,684,608 shares (5.9%), but that figure is sourced in the proxy to a Schedule 13G/A filed 29 January 2024 reporting ownership as of 31 December 2023, which is more than two years stale next to the 13F.
• No Schedule 13D or 13G/A has been filed on Arista common stock by any holder since 12 November 2024, per the EDGAR filing index for CIK 0001596532 (forms containing 'SC 13' in the recent filings feed). That removes 13D/G as an independent, current cross-check on any holder here, which is why the 13F route was used for all seven institutional rows.
• Only one Vanguard filing entity was found: 'VANGUARD GROUP INC' under CIK 0000102909. No separate 'Vanguard Capital Management LLC' filer was found on Arista's CUSIP (040413205) in the periods checked, so there is no duplicate-Vanguard risk to flag for this file.
• Vanguard filed Form 13F-NT (notice, no holdings table) for the quarters ended 31 March 2026 and 30 June 2026 under CIK 0000102909, so its most recent 13F-HR with an actual holdings table is for the quarter ended 31 December 2025, used here.
• SELF GATE: summing shares for every register row that is neither a rolled-up member nor an aggregate (the 7 institutional 13F rows plus the standalone Bechtolsheim Family Trust row) gives 530,806,952 shares against 1,261,224,648 shares outstanding, or 42.09%, inside the 15-55% sanity band the brief specifies and close to its stated 25-45% expectation.
• 17.0% of Arista's outstanding common stock is beneficially owned in aggregate by 'certain of our executive officers and directors and holders of more than 5% of our outstanding capital stock together with their affiliates', per the Q2 FY2026 10-Q (period ended 30 June 2026), cited there as a risk factor concentration point rather than broken into named holders in that filing; the proxy's own beneficial-ownership table (used for the named rows above) is the more granular, dated source.