---
schema_version: "secwatch.filing_event.v1"
accession: "0001288847-25-000025"
form_type: "8-K"
ticker: "FIVN"
cik: "0001288847"
company_name: "Five9, Inc."
filed_at: "2025-02-20T23:59:59+00:00"
generated_at: "2026-05-26T08:07:39.751864+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Five9 CFO Barry Zwarenstein to retire March 31; Bryan Lee named interim CFO

## Summary
- Barry Zwarenstein retires as CFO effective March 31, 2025, after 13+ years; will assist transition through June 30.
- Bryan Lee, EVP of Finance since Dec 2024, appointed interim CFO as of April 1, 2025; formal search underway.
- Lee to receive $456K base salary, 60% target bonus, and $2M RSU award (25% vest Dec 2025, 18.75% quarterly thereafter).
- Zwarenstein will serve as consultant from July 1 to Sept 30, 2025, receiving hourly pay and pro-rated 2025 bonus.

## SEC filing metadata
- accession: 0001288847-25-000025
- form_type: 8-K
- ticker: FIVN
- cik: 0001288847
- company_name: Five9, Inc.
- filed_at: 2025-02-20T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1288847/000128884725000025/0001288847-25-000025-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1288847/000128884725000025/fivn-20250220.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001288847-25-000025
- JSON: https://secwatch.observer/filing/0001288847-25-000025.json
- Plain text: https://secwatch.observer/filing/0001288847-25-000025.txt

## Key facts
- Executive change
  Barry Zwarenstein departed as Chief Financial Officer at Five9, Inc..
  - Action: retire
  - Role: Chief Financial Officer
  source text: Barry Zwarenstein has decided to retire from his position as the Chief Financial Officer (“CFO”) of Five9, Inc. (the “Company”), effective as of March 31, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1288847/000128884725000025/0001288847-25-000025-index.htm
- Executive change
  Bryan Lee was appointed as Interim Chief Financial Officer at Five9, Inc..
  - Action: appointed
  - Role: Interim Chief Financial Officer
  source text: the Company announced that the Board appointed Bryan Lee, 46, the Company’s current Executive Vice President of Finance, as the Company’s Interim Chief Financial Officer and Interim Principal Financial Officer, effective as of April 1, 2025
  evidence_url: https://www.sec.gov/Archives/edgar/data/1288847/000128884725000025/0001288847-25-000025-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.