Gallaghers Bremer Acquisition Expands Midwest Footprint as $330M Volume Ranks 314th in Market Activity

On September 9, 2025, Arthur J. Gallagher & Co. , , , ranking 314th in market activity. The firm announced the acquisition of Bremer Insurance Agencies, Inc., a property/casualty broker based in St. Paul, Minnesota, expanding its retail brokerage footprint in the Upper Midwest. The target, previously a subsidiary of Old National Bancorp following its acquisition of Bremer Bank, serves commercial, agricultural, and personal lines clients across Minnesota, North Dakota, and Wisconsin.

Bremer’s team, led by , will integrate into Gallagher’s Great Lakes region under Sean Gallagher’s leadership. CEO J. Patrick Gallagher, Jr. emphasized the acquisition strengthens the company’s client service capabilities in the region. This follows Gallagher’s broader expansion strategy, including the recent acquisition of AssuredPartners and MACK Insurance Services, though financial terms for these deals remain undisclosed.

, . Despite short-term performance challenges, , citing long-term earnings potential from strategic acquisitions. The company’s global operations span 130 countries through owned entities and correspondent networks.

I understand the idea: each day you would buy an equal-weighted basket of the 500 U.S. stocks that traded the highest dollar volume, hold them for one session, then rebalance the next day, covering the period 2022-01-03 to today (2025-09-09). At the moment, the back-testing framework exposed here is designed for single-ticker or single-event studies (e.g., “what happens to AAPL after a volume spike?”). It does not yet support building and rebalancing a large cross-sectional portfolio every day. We have two practical ways forward: 1. Narrow the question to a single-ticker, event-driven study 2. Use a proxy or benchmark that already aggregates high-volume stocks (e.g., a “Most-Active” index/ETF if one exists) and back-test that single instrument. Please let me know which direction (or another) you’d like to take, and I’ll proceed immediately.