Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in AJG held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 19.3M | $4.18B | +0.4% | 7.510% | 0.07% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 16.7M | $3.62B | β | 6.495% | 0.09% |
| 3 | FMR LLC | 14.6M | $3.17B | -3.2% | 5.687% | 0.17% |
| 4 | Capital World Investors | 13.8M | $2.99B | +9.6% | 5.375% | 0.41% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 12.4M | $2.69B | β | 4.830% | 0.14% |
| 6 | STATE STREET CORP | 11.0M | $2.38B | +0.2% | 4.268% | 0.08% |
| 7 | DODGE & COX | 7.4M | $1.59B | +735.2% | 2.861% | 0.88% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 6.2M | $1.35B | +3.8% | 2.429% | 0.08% |
| 9 | MORGAN STANLEY | 4.1M | $878.5M | -47.8% | 1.578% | 0.05% |
| 10 | PRINCIPAL FINANCIAL GROUP INC | 3.2M | $702.2M | +14.4% | 1.261% | 0.38% |
| 11 | Capital Research Global Investors | 3.0M | $645.4M | +92.5% | 1.159% | 0.10% |
| 12 | EAGLE CAPITAL MANAGEMENT LLC | 2.7M | $577.3M | β | 1.037% | 1.94% |
| 13 | Capital International Investors | 2.6M | $562.3M | -58.7% | 1.010% | 0.13% |
| 14 | WELLINGTON MANAGEMENT GROUP LLP | 2.6M | $559.5M | -12.9% | 1.005% | 0.10% |
| 15 | GTCR LLC | 2.4M | $514.1M | β | 0.923% | 13.60% |
| 16 | WCM INVESTMENT MANAGEMENT, LLC | 2.4M | $510.2M | -0.8% | 0.919% | 1.16% |
| 17 | NORTHERN TRUST CORP | 2.2M | $482.9M | -0.0% | 0.867% | 0.06% |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.1M | $457.2M | +3.2% | 0.821% | 0.07% |
| 19 | JANUS HENDERSON GROUP PLC | 2.0M | $426.9M | +5.4% | 0.767% | 0.21% |
| 20 | FRANKLIN RESOURCES INC | 2.0M | $423.2M | +400.6% | 0.760% | 0.10% |
| 21 | GOLDMAN SACHS GROUP INC | 2.0M | $423.0M | +14.3% | 0.760% | 0.05% |
| 22 | BANK OF AMERICA CORP /DE/ | 1.9M | $401.6M | +23.0% | 0.721% | 0.03% |
| 23 | Invesco Ltd. | 1.7M | $371.6M | -1.0% | 0.667% | 0.06% |
| 24 | BROWN ADVISORY INC | 1.6M | $342.3M | -22.1% | 0.615% | 0.56% |
| 25 | UBS ASSET MANAGEMENT AMERICAS INC | 1.4M | $314.0M | +0.2% | 0.564% | 0.07% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in AJG β a direct measure of their conviction.
Filings activity in AJG during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new AJG position in Q1 2026
Institutions that fully closed their AJG position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,222 | 3.8% | 79.19% | 24.82 pp | $44.52B | 24% |
| Q4 2025 | 1,270 | 2.4% | 104.01% | 15.61 pp | $58.48B | 13% |
| Q3 2025 | 1,301 | 4.0% | 119.62% | 5.86 pp | $67.26B | 4.7% |
| Q2 2025 | 1,355 | +2.3% | 125.48% | 7.71 pp | $70.55B | 5.8% |
| Q1 2025 | 1,324 | +3.6% | 133.19% | +21.18 pp | $74.89B | +19% |
| Q4 2024 | 1,278 | +10% | 112.01% | +24.26 pp | $62.98B | +28% |
| Q3 2024 | 1,160 | +4.2% | 87.75% | 19.44 pp | $49.34B | 18% |
| Q2 2024 | 1,113 | β | 107.19% | β | $60.27B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying AJG stock.
Based on Q1 2026 13F filings, institutional ownership of Arthur J. Gallagher & Co. stands at 79.2%, held across 1,222 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of AJG, with approximately 19,307,796 shares worth $4.18B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of AJG.
Our composite Smart Money Score for AJG is 17 out of 100 (Heavy Distribution). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
167 institutions opened new positions in AJG during Q1 2026, while 215 fully exited. 173 added to existing positions and 878 trimmed.
AJG institutional ownership fell by 24.82 percentage points quarter-over-quarter, with a net change of -48 holders.
The top 10 institutions account for 52.9% of all reported 13F value in AJG, and the top 25 account for 68.6%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Arthur J. Gallagher & Co. (AJG) Institutional Ownership