Board Structure and Operational Performance in Upstream Oil and Gas Companies in Nigeria

Abstract

This paper examined whether board structure was associated with operational reliability in Nigerian upstream oil and gas companies from 2012 to 2024. Operational performance was measured with the production uptime ratio, while board structure comprised board size, the proportion of independent non-executive directors, and the proportion of female directors. The study used an archival panel of 18 operators and 176 firm-year observations, constructed from audited annual reports, governance statements, sustainability disclosures, and regulator-verified summaries. A fixed effects identification strategy was applied with firm and year effects, firm clustered standard errors, and sequential controls for firm size, ownership, and asset vintage, followed by firm-specific trend checks and multiple robustness tests. Results indicated that independence was positively and significantly related to uptime across all specifications. In the fully controlled model with firm trends, a 0.10 increase in independence was associated with an increase in uptime of about 0.61 percentage points. Gender diversity displayed a positive and modest association with uptime that remained weakly significant after controls. Board size showed a small positive effect with mild tapering when a quadratic term was introduced. Findings were stable to alternative board thresholds, winsorisation, restricted disclosure samples, and a balanced panel, and did not replicate in placebo regressions that used revenue growth. The evidence suggested that boards with meaningful independence and sustained gender representation supported higher operating reliability through stronger monitoring of maintenance, shutdown planning, and integrity programs. The study contributed by linking board structure directly to a field-level performance metric and implied that internal governance improvements could complement ongoing regulatory reforms to enhance reliability and reduce losses in Nigeria’s upstream segment.