---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-116099"
form_type: "8-K"
ticker: null
cik: "0001166258"
company_name: "PIONEER HIGH INCOME FUND, INC."
filed_at: "2025-05-09T23:59:59+00:00"
generated_at: "2026-05-22T01:23:03.768911+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Pioneer funds remove Maryland Control Share Acquisition Act provision

## Summary
- On May 6, 2025, boards of six Pioneer funds amended bylaws to delete Article II, Section 13, which subjected funds to the Maryland Control Share Acquisition Act.
- The repealed provision limited voting rights of shareholders acquiring certain ownership thresholds.
- The amendments apply to: Pioneer Diversified High Income, Floating Rate, High Income, Municipal High Income, Municipal High Income Advantage, Municipal High Income Opportunities Funds.

## SEC filing metadata
- accession: 0001193125-25-116099
- form_type: 8-K
- cik: 0001166258
- company_name: PIONEER HIGH INCOME FUND, INC.
- filed_at: 2025-05-09T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1166258/000119312525116099/0001193125-25-116099-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1166258/000119312525116099/d947820d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-116099
- JSON: https://secwatch.observer/filing/0001193125-25-116099.json
- Plain text: https://secwatch.observer/filing/0001193125-25-116099.txt

## Key facts
- Governance Changes
  PIONEER HIGH INCOME FUND, INC.: Repealed Article II, Section 13 to remove application of the Maryland Control Share Acquisition Act (effective 2025-05-06).
  - Change: bylaw amendment
  - Effective: 2025-05-06
  source text: On May 6, 2025, the Board of Directors of Pioneer Diversified High Income Fund, Inc., Pioneer Floating Rate Fund, Inc., Pioneer High Income Fund, Inc., Pioneer Municipal High Income Advantage Fund, Inc., Pioneer Municipal High Income Fund, Inc. and Pioneer Municipal High Income Opportunities Fund, Inc. (each, a “Fund”) amended the Bylaws of the Fund to remove Article II, Section 13.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1166258/000119312525116099/0001193125-25-116099-index.htm

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