---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-24-037397"
form_type: "8-K"
ticker: "NSA"
cik: "0001618563"
company_name: "National Storage Affiliates Trust"
filed_at: "2024-08-15T23:59:59+00:00"
generated_at: "2026-05-31T09:01:23.104362+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.45
calibrated_materiality_score: 0.45
confidence: "high"
source: SEC EDGAR
---

# NSA director Mark Van Mourick resigns; Warren Allan elected to board and audit committee

## Summary
- Van Mourick resigned Aug 15, 2024, effective immediately; no dispute with the company.
- Board elected Warren Allan (66), former President of Optivest, to fill vacancy and serve on Audit Committee.
- Allan received ~$2.9M cash and 209,333 OP units (~$8.4M value) from Optivest asset acquisition.
- Supervisory & admin fees paid to Optivest: $4.8M (2023), $2.7M (Jan-Jul 2024); expense reimbursements $7.2M and $4.3M.
- Allan's share of those fees: ~$1.7M (2023) and ~$1.0M (2024); expense reimbursements $2.5M and $1.5M.

## SEC filing metadata
- accession: 0001628280-24-037397
- form_type: 8-K
- ticker: NSA
- cik: 0001618563
- company_name: National Storage Affiliates Trust
- filed_at: 2024-08-15T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.45
- calibrated_materiality_score: 0.45
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1618563/000162828024037397/0001628280-24-037397-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1618563/000162828024037397/nsa-20240815.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-24-037397
- JSON: https://secwatch.observer/filing/0001628280-24-037397.json
- Plain text: https://secwatch.observer/filing/0001628280-24-037397.txt

## Key facts
- Executive change
  Mark Van Mourick departed as member of the Board of Trustees at National Storage Affiliates Trust.
  - Action: resigning
  - Role: member of the Board of Trustees
  source text: On August 15, 2024, Mark Van Mourick, a member of the Board of Trustees (the “Board”) of National Storage Affiliates Trust (the “Company”) informed the Board that he is resigning from the Board effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1618563/000162828024037397/0001628280-24-037397-index.htm
- Executive change
  Warren Allan was elected as member of the Board of Trustees at National Storage Affiliates Trust.
  - Action: elected
  - Role: member of the Board of Trustees
  source text: the Board, upon recommendation of the Compensation, Nominating and Corporate Governance Committee of the Board (the “CNCG Committee”), elected Warren Allan, 66, to serve as a member of the Board, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1618563/000162828024037397/0001628280-24-037397-index.htm

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