Charles H. Giancarlo
Charles H. Giancarlo: Director at Zscaler and Director at Arista Networks. What Charles H. Giancarlo holds in 2 AI and semiconductor companies tracked on Silicon Floor, from their SEC filings, broken down: the shares held and how, then any restricted shares, options or other rights declared.
Zscaler (ZS)
Charles H. Giancarlo holds 288,275 Zscaler shares (0.18% of the company), worth about $58.7M at the last price, according to the Form 4 of Jan 12, 2026.
- Shares held: 145,451 (0.09%), $29.6M — Held in their own name.
- Shares held: 142,824 (0.09%), $29.1M — Held through companies or funds (See footnote).
Arista Networks (ANET)
Charles H. Giancarlo holds 185,842 Arista Networks shares (0.01% of the company), worth about $38.6M at the last price, according to the Form 4 of Aug 20, 2026.
- Shares held: 184,333 (0.01%), $38.3M — Held through trusts (by Trust).
- Shares held: 1,509 (0.00%), $313,389.12 — Held in their own name.
- Share units: 1,615 (0.00%), $335,403.20 — Arista Networks promised them as pay: each unit becomes a share when it vests, if its conditions are met. No vote until then.
Declarations
- Arista Networks (ANET) — Form 4 of Aug 20, 2026: option exercise or conversion of 538; 185,842 shares after 0001596532-26-000204
- Arista Networks (ANET) — Form 4 of Aug 3, 2026: open-market sale of 322 at $174.49; open-market sale of 817 at $175.46; 185,304 shares after 0001596532-26-000178
- Arista Networks (ANET) — Form 4 of Jul 1, 2026: open-market sale of 28 at $162.34; open-market sale of 279 at $162.62; 193,304 shares after 0001596532-26-000155
- Arista Networks (ANET) — Form 4 of Jun 1, 2026: open-market sale of 302 at $162.28; open-market sale of 52 at $164.48; 201,304 shares after 0001596532-26-000134
- Arista Networks (ANET) — Form 4 of May 29, 2026 0001596532-26-000130
- Arista Networks (ANET) — Form 4 of May 20, 2026: option exercise or conversion of 971; 209,304 shares after 0001596532-26-000093
- Arista Networks (ANET) — Form 4 of May 1, 2026: open-market sale of 467 at $173.39; open-market sale of 1,000 at $174.25; 208,333 shares after 0001596532-26-000077
- Arista Networks (ANET) — Form 4 of Apr 1, 2026: open-market sale of 3,898 at $125.38; open-market sale of 3,702 at $126.44; 216,333 shares after 0001596532-26-000052
- Arista Networks (ANET) — Form 4 of Mar 2, 2026: open-market sale of 3,100 at $127.90; open-market sale of 3,600 at $128.87; 224,333 shares after 0001596532-26-000043
- Arista Networks (ANET) — Form 4 of Feb 20, 2026: option exercise or conversion of 971; 232,333 shares after 0001596532-26-000033
- Arista Networks (ANET) — Form 4 of Feb 2, 2026: open-market sale of 1,900 at $138.91; open-market sale of 1,590 at $140.27; 231,362 shares after 0001596532-26-000007
- Zscaler (ZS) — Form 4 of Jan 12, 2026: grant or award of 1,076; 288,275 shares after 0001713683-26-000020
- Arista Networks (ANET) — Form 4 of Jan 2, 2026: open-market sale of 2,476 at $132.97; open-market sale of 3,524 at $133.64; 239,362 shares after 0001596532-26-000002
- Arista Networks (ANET) — Form 4 of Dec 1, 2025: open-market sale of 564 at $126.93; open-market sale of 4,552 at $127.93; 247,362 shares after 0001596532-25-000320
- Arista Networks (ANET) — Form 4 of Nov 20, 2025: option exercise or conversion of 971; 255,362 shares after 0001596532-25-000305
Sources: SEC Schedules 13D and 13G (stakes above 5%, which count everything a person votes or can acquire within 60 days) and Forms 3, 4 and 5 (the shares a director, officer or 10% owner holds, filed within two business days of each trade). Values at the last price.