Top Staffing and Recruiting Agencies in 2026

The US staffing and recruiting industry is projected to be worth more than $180 billion in 2026, spread across roughly 27,000 firms, according to Staffing Industry Analysts. Choosing well inside that market starts with understanding that "agency" describes four quite different businesses.

The four models, and what they cost

• Temporary and contract staffing. The agency employs the worker and bills you an hourly rate with a markup, typically 40–70% over the pay rate. Best for surge capacity and specialist contract work.
• Contingency recruiting. You pay only on a successful placement, usually 15–25% of first-year salary. No risk up front, but you are one of several agencies racing on the same role.
• Retained executive search. An exclusive engagement with fees of roughly 30–33% of first-year compensation, paid in instalments. Reserved for leadership hires where a mis-hire is genuinely expensive.
• RPO (recruitment process outsourcing). The agency runs some or all of your hiring function on an ongoing basis. Priced per hire or as a monthly management fee.

The largest global staffing firms

• Randstad — the largest staffing group in the world by revenue, operating across nearly every market and sector.
• The Adecco Group — global generalist staffing at enormous scale, plus the Akkodis and LHH brands.
• Allegis Group — the largest staffing firm in the US, and the parent of TEKsystems and Aerotek.
• ManpowerGroup — Manpower, Experis, and Talent Solutions, strong in industrial and technical contract work.
• Kelly — long established across education, science, and engineering staffing.

Specialist leaders by sector

• Technology: TEKsystems is the largest IT staffing firm in the US; Insight Global is a close competitor with heavy contract volume.
• Healthcare: Aya Healthcare dominates travel nursing and clinical placement.
• Finance and accounting: Robert Half remains the clear leader, with Protiviti attached for consulting work.
• Executive search: Korn Ferry and Heidrick & Struggles for C-suite and board appointments.
• Professional and mid-market: Michael Page, Hays, and Robert Walters across the UK, Europe, and Asia-Pacific.

India

• TeamLease — one of India's largest staffing companies, strong in high-volume and frontline hiring.
• ABC Consultants — one of the oldest executive search firms in India, focused on leadership hiring.
• Randstad India — full staffing and RPO coverage across metros and tier-2 cities.

How to work with an agency without wasting money

• Brief properly. Most agency failure is brief failure. Give them a scorecard, not a job description — what "good" looks like, ranked.
• Do not run six contingency agencies at once. You get duplicate submissions and the least effort from all of them. Two is usually the right number.
• Agree the guarantee period in writing. Ninety days is standard; longer is negotiable on senior roles.
• Respond within 48 hours. Agencies deprioritise clients who sit on submittals, and so do candidates.
• Track cost per hire against your in-house channels. A 20% fee on a $120,000 salary is $24,000. That is a real number to compare against.

When to bring it in-house instead

Agencies earn their fee on genuinely hard searches: scarce skills, confidential replacements, senior leadership, and unfamiliar markets. They are poor value on volume roles where the candidates are already applying to you and the real work is screening the pile quickly.

If two or three agency placements a year would cost more than a recruiting platform, the arithmetic is worth doing. SortList automates the screening, scheduling, and follow-up that makes in-house hiring slow — and for agencies themselves, pairs that automation with multi-client CRM and placement tracking. See pricing.