Schedule 13G filing

Vanguard Portfolio Management LLC disclosed a 8.8% stake in FIVN

Schedule 13G · Filed Oct 30, 2026

Vanguard Portfolio Management LLC reported owning 8.8% of Five9, Inc. (FIVN) (6,579,962 shares) in a Schedule 13G filed Oct 30, 2026.

A 13G is a passive stake: the holder does not plan to push for changes.

Stake

Five9, Inc.

Stake

8.8% stake

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From a public Schedule 13G, linked above. Not investment advice, and not a recommendation to buy or sell.