---
schema_version: "secwatch.filing_event.v1"
accession: "0001109448-23-000030"
form_type: "8-K"
ticker: null
cik: "0001109448"
company_name: "ALLIANCEBERNSTEIN L.P."
filed_at: "2023-06-01T23:59:59+00:00"
generated_at: "2026-06-14T08:58:08.380164+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# AB CFO & COO Kate Burke resigns; Siemers interim CFO, Sprules COO

## Summary
- Kate Burke resigned as COO and CFO effective May 31, 2023 to become president of a large private asset manager.
- William R. Siemers (Controller & CAO) appointed Interim CFO, effective immediately; he held the same interim role in 2022.
- Karl Sprules (Head of Global Technology & Operations) appointed COO, effective immediately; he joined AB in 1998 and was CTO.

## SEC filing metadata
- accession: 0001109448-23-000030
- form_type: 8-K
- cik: 0001109448
- company_name: ALLIANCEBERNSTEIN L.P.
- filed_at: 2023-06-01T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1109448/000110944823000030/0001109448-23-000030-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1109448/000110944823000030/ab-20230601.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001109448-23-000030
- JSON: https://secwatch.observer/filing/0001109448-23-000030.json
- Plain text: https://secwatch.observer/filing/0001109448-23-000030.txt

## Key facts
- Executive change
  William R. Siemers was appointed as Interim Chief Financial Officer at ALLIANCEBERNSTEIN L.P..
  - Action: appointed
  - Role: Interim Chief Financial Officer
  source text: AB appointed William R. Siemers, AB's Controller and Chief Accounting Officer, as Interim Chief Financial Officer, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1109448/000110944823000030/0001109448-23-000030-index.htm
- Executive change
  Karl Sprules was appointed as Chief Operating Officer at ALLIANCEBERNSTEIN L.P..
  - Action: appointed
  - Role: Chief Operating Officer
  source text: In addition, AB appointed Karl Sprules, AB's Head of Global Technology & Operations, as Chief Operating Officer, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1109448/000110944823000030/0001109448-23-000030-index.htm
- Executive change
  Kate Burke resigned as Chief Operating Officer and Chief Financial Officer at ALLIANCEBERNSTEIN L.P..
  - Action: resigned
  - Role: Chief Operating Officer and Chief Financial Officer
  source text: On May 31, 2023, Kate Burke notified AllianceBernstein L.P. (“AB”) of her resignation from her positions as Chief Operating Officer and Chief Financial Officer, effective May 31, 2023, to become the president of a large privately-owned asset management firm.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1109448/000110944823000030/0001109448-23-000030-index.htm

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