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COGNITIVE SERVICES
Staffing / Recruiting
Leader: Allegis Group — 5.0% S1 · 10.9% CR3
S1
leader
CR3
top 3 combined
HHI
Unconcentrated
MARKET SIZE
US
How this is calculated
FORMULA
S1 = Allegis Group revenue / total revenue = 5.0%
CR3 = Allegis Group + Aya Healthcare + Randstad = 10.9%
HHI = Σ(share²) = 44 (Unconcentrated (HHI < 1,500))
DENOMINATOR
Revenue — $220B (US)
Total US staffing industry revenue (temp + perm placement).
Size from: SIA Staffing Industry Analysts
TOP 3 PLAYERS
#1Allegis Group5.0%
#2Aya Healthcare3.7%
#3Randstad2.2%
METHODOLOGY NOTE
Per SIA's Largest Staffing Firms in the US 2025 update: Allegis Group 5.0%, Aya Healthcare 3.7%, Randstad US 2.2% of $220B US staffing industry revenue. Refreshed May 2026 to match the SIA-published US-share figures directly (prior estimate had Allegis at 6.6% which exceeded the SIA published number). Allegis (private holdco of Aerotek + TEKsystems) and Aya (San Diego-based healthcare staffing, private) don't file financials but SIA tracks their US revenue via direct firm reporting.
Year: 2025
Geo: US
Firms: 25,000+
Labor economics
REV / EMPLOYEE (leader)
$0.2M
industry avg $0.1M
SG&A % (leader)
17%
of revenue
Allegis Group is private (SIA US #1, $14.5B 2024); rev/emp and SG&A not disclosed. Numbers shown are industry-typical staffing peer averages (Randstad 17.4% SG&A on ~$180K rev/emp). Pure labor brokers most at risk from AI matching.
Related markets
Source Quality Hierarchy
Every market has a primary source plus 1–3 validation sources. Revenue numerators come from SEC 10-K filings; denominators validated against the Economic Census where available.
TIER 1Authoritative anchorsGovernment data + SEC filings
US Economic Census (data.census.gov) · SEC EDGAR / Company 10-Ks · BEA Industry Value-Added (FRED) · BLS QCEW · USGS Mineral Commodity Summaries · EIA Refinery Capacity Report · FDA device listings
TIER 2Leading commercial trackersIndustry-standard paid trackers
IDC Semiannual Software Tracker · Gartner Market Share & Magic Quadrant · IBISWorld NAICS reports · StatCounter Global Stats · eMarketer / Insider Intelligence · Synergy Research Group
TIER 3Category specialistsBest-in-class niche authorities
SIPRI (aerospace & defense) · IQVIA (pharma) · TrendForce (semiconductors) · CIMdata (CAD/PLM) · Nilson Report (payments) · Am Law 100 (legal) · ENR Top 500 (A&E) · AM Best (insurance) · SIA (staffing) · Ad Age (agencies) · Barron's / Cerulli (wealth) · Evaluate MedTech · Nielsen Gauge (streaming) · Gridwise (ride-hail) · Bloomberg Second Measure (delivery) · RC Top 100 (roofing) · SDM Top 100 (fire/safety) · Big 4 annual reports · ALM Intelligence (consulting)
Data vintage: Q2 2025 research compilation. Labels updated 2026-Q2. Tier 1 sources refreshed from FY2025 SEC filings where available. For full methodology see the Methodology page.