Mills Selig

Overview

Mills Selig is a Belfast‑based, independent commercial law firm positioned as one of Northern Ireland’s leading advisers on high‑value and complex work. The firm emphasises a partner‑led, multidisciplinary ‘one team’ approach and acts for clients ranging from PLCs, private equity houses and banks to large property developers, retailers and media organisations across Ireland, Great Britain and internationally. Mills Selig combines a local focus with cross‑jurisdiction capability (an association with a Dublin firm and many dual‑qualified lawyers) and has invested in office renovation and sector capability to support growth in areas such as banking, corporate, construction, climate & energy and restructuring. The firm promotes a people‑first culture, strong trainee retention and regular senior hires and promotions, and is regularly ranked in professional directories.

• Headquarters: Belfast, 21 Arthur Street
• Founded: 1959
• Lawyers: 60+
• Partners: 16
• Trainees: 5
• Offices: 1

Values & Culture

Practice Areas

• Banking & Finance
• Construction & Engineering
• Commercial Contracts
• Corporate & M&A
• Dispute Resolution & Litigation
• Employment
• Energy & Natural Resources
• Environment & Planning
• ESG & Sustainability
• Insolvency & Restructuring
• Intellectual Property
• Private Client & Wealth
• Real Estate
• Regulatory & Compliance
• Media & Entertainment
• Technology & Digital
• Hospitality & Leisure
• Financial Services & Regulation
• Housing & Social Housing
• Retail & Consumer
• Private Equity & Venture Capital

Geographic Focus: Primary market: Belfast / Northern Ireland with all‑Ireland capability through an association with a Dublin firm; many lawyers are dual‑qualified to act in Northern Ireland and England & Wales. The firm handles transactions with cross‑jurisdictional elements across Great Britain, mainland Europe and internationally, and acts for lenders, private equity, corporates and financial institutions with multi‑jurisdictional deals.

Training Contract

Two‑year training contract aligned to the Institute of Professional Legal Studies route. Trainees rotate through multiple seats across the firm’s core commercial practices (see seat_options). The programme is partner‑led, places trainees in direct client contact and integrates firm‑wide committee participation and mentoring. Trainees are assigned a mentor who provides regular feedback and support throughout the two years.

• Trainee Intake: 5
• Academic Requirements: Opportunity for Final Year Law Students and Law Graduates who have applied for, or plan to apply to, the Institute of Professional Legal Studies (IPLS).
• Application Deadline: 2026-10-23

Seat Options

• Corporate & M&A
• Commercial Contracts
• Real Estate
• Dispute Resolution & Litigation
• Employment
• Banking & Finance
• Private Client & Wealth

Mentorship

All trainees are assigned a mentor who maintains regular contact to discuss progress, provide guidance and support. Trainees are also encouraged to join employee‑led committees and peer networks for additional pastoral and professional development.

Apply on the Mills Selig website →

Programmes & Schemes

Notable Matters

What Mills Selig Looks For

Key Competencies

• Commercial instincts / commercial awareness
• Commitment and passion
• Teamwork and collaboration
• Attention to detail
• Problem solving and critical thinking
• Client focus and communication
• Resilience and drive

Evidence Signals

• Commercial work experience in firms or in‑house roles
• Pro‑bono or community involvement
• Participation in university employer events or conversations with firm lawyers
• Relevant sector experience (banking/finance, property, corporate)
• Concise, well‑structured application answers demonstrating research into Mills Selig

Benefits & Wellbeing

• Assigned mentor for each trainee and regular mentor contact
• Opportunity for client‑facing work and early responsibility for trainees
• Participation in employee‑led committees (health & wellbeing, social, charity, diversity & equality)
• Extensive pro‑bono support for local businesses, charities and community organisations
• Active charity programme (annual Summer Spin, Yo‑Pro events, marathons, bake‑offs, Christmas initiatives)
• Office renovation and modern meeting/reception spaces to support client and team events
• Firm supplied with renewable energy (3T Power) as part of ESG/sustainability commitments
• Strong track record of offering newly qualified positions to trainees
• Opportunities to work on high‑value, multi‑jurisdictional mandates and shortlisted deal work

Wellbeing

The firm operates a health and wellbeing committee, runs wellbeing and social programmes, encourages volunteer days and supports charity activity; staff are invited to participate in marathons and fundraising events and the firm highlights an employee‑led approach to shaping wellbeing initiatives.

Awards & Recognition

• Corporate Law Firm of the Year 2022
• Corporate Law Firm of the Year 2024
• Diversity Mark Reaccreditation (2026)
• Bronze Diversity Mark (2022)
• Legal 500 — Top Tier / Leading Firm status (retained in 2023/2024 listings)
• Chambers and Partners High Net Worth Guide ranking (retained for 2025)
• Shortlisted — Insider Media Dealmakers Awards (2023)

Diversity, Equity & Inclusion

Mills Selig has maintained a majority female board for more than a decade and emphasises meritocratic reward and opportunities. The firm has achieved Diversity Mark accreditation and subsequent reaccreditation, signalling an ongoing commitment to embedding inclusive policies and employee engagement.

• Diversity Committee (employee‑led)
• Health & Wellbeing Committee
• Social Committee
• Charity Committee
• Support for Belfast Pride
• Diversity Mark Accreditation / Reaccreditation

Pro Bono

The firm provides extensive pro‑bono support to local businesses, charities and community organisations; its charity partners and fundraising activities have included support for Angel Wishes NI, Women’s Aid NI, St Vincent de Paul & Salvation Army Family Appeal and other local causes. Staff regularly participate in charity marathons, fundraising events and volunteer days.

Innovation

Quick Application Angles

• Reference the firm’s recent high‑value corporate and finance work (for example the Foresight / Hospital Services exit and the £35m Danske Bank facility) to show commercial awareness and why you want to train at a firm that handles complex, cross‑jurisdictional deals.
• Highlight examples of client‑facing responsibility or teamwork (university projects, part‑time work or pro‑bono) — Mills Selig emphasises early client contact and a partner‑led model where trainees work closely with partners.
• Demonstrate alignment with the firm’s people‑first culture (mention interest in committee involvement, diversity & wellbeing) and note the firm’s Diversity Mark reaccreditation to show you value inclusion and long‑term career development.
• If applying for a finance, corporate or property seat, include concrete evidence of sector interest (transactional experience, relevant coursework or internships) and reference the Banking & Finance team’s sector focus and recent shortlisted deals.