Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionClear Harbor Asset Management, LLC
Latest Disclosed Ownership4,818 shares
Latest Disclosed Value $ 1,043,482
Clear Harbor Asset Management, LLC ownership in AJG / Arthur J. Gallagher & Co.

On May 5, 2026 - Clear Harbor Asset Management, LLC filed a 13F-HR form disclosing ownership of 4,818 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $1,043,482 USD as of March 31, 2026. The entity filed a previous 13F-HR on April 14, 2021 disclosing 0 shares of Arthur J. Gallagher & Co..

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-05 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 4,818 4,818 1,043 0.0720
2021-04-14 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 0 -26,126 -100.00 0 -100.00
2021-02-04 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 26,126 0 0.00 3,232 17.19 0.4642
2020-10-26 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 26,126 0 0.00 2,758 8.28 0.4710
2020-08-05 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 26,126 0 0.00 2,547 19.58 0.4822
2020-05-14 2020-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 26,126 -9,806 -27.29 2,130 -37.74 0.4965
2020-05-08 2020-03-31 13F GALLAGHER ARTHUR J COM 363576109 26,126 -9,806 2,130 504,905.6443
2020-01-29 2019-12-31 13F GALLAGHER ARTHUR J COM 363576109 35,932 -173 -0.48 3,422 5.78 0.5928
2019-10-31 2019-09-30 13F GALLAGHER ARTHUR J COM 363576109 36,105 0 0.00 3,234 2.28 0.6314
2019-07-22 2019-06-30 13F GALLAGHER ARTHUR J COM 363576109 36,105 0 0.00 3,162 12.13 0.6362
2019-04-19 2019-03-31 13F GALLAGHER ARTHUR J COM 363576109 36,105 -4,668 -11.45 2,820 -6.16 0.5715
2019-02-11 2018-12-31 13F GALLAGHER ARTHUR J COM 363576109 40,773 -240 -0.59 3,005 0.40 0.6911
2018-10-26 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 41,013 0 0.00 2,993 11.80 0.6034
2018-08-03 2018-06-30 13F GALLAGHER ARTHUR J COM 363576109 41,013 0 0.00 2,677 -5.04 0.5000
2018-05-01 2018-03-31 13F GALLAGHER ARTHUR J COM 363576109 41,013 -3,827 -8.53 2,819 -0.63 0.5508
2018-01-23 2017-12-31 13F GALLAGHER ARTHUR J COM 363576109 44,840 -3,166 -6.60 2,837 -3.99 0.5336
2017-10-25 2017-09-30 13F GALLAGHER ARTHUR J COM 363576109 48,006 0 0.00 2,955 8.24 0.5861
2017-07-25 2017-06-30 13F GALLAGHER ARTHUR J COM 363576109 48,006 0 0.00 2,730 0.59 0.5221
2017-04-25 2017-03-31 13F GALLAGHER ARTHUR J COM 363576109 48,006 -2,018 -4.03 2,714 4.42 0.5479
2017-01-20 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 50,024 -10,302 -17.08 2,599 -15.31 0.5474
2016-11-07 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 60,326 0 0.00 3,069 6.86 0.6700
2016-08-05 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 60,326 60,326 0.00 2,872 7.04 0.6246
2016-05-18 2016-03-31 13F GALLAGHER ARTHUR J COM 363576109 60,326 60,326 -8.63 2,683 -0.74 0.5900
2016-01-20 2015-12-31 13F GALLAGHER ARTHUR J COM 363576109 66,026 66,026 -0.18 2,703 -0.99 0.6141
2015-10-27 2015-09-30 13F GALLAGHER ARTHUR J COM 363576109 66,144 66,144 0.00 2,730 -12.75 0.6247
2015-07-23 2015-06-30 13F GALLAGHER ARTHUR J COM 363576109 66,144 66,144 0.00 3,129 1.20 0.6132
2015-04-16 2015-03-31 13F GALLAGHER ARTHUR J COM 363576109 66,144 66,144 0.00 3,092 0.5948
2015-01-30 2014-12-31 13F GALLAGHER ARTHUR J COM 363576109 0 -76,644 -100.00 0 -100.00
2014-10-22 2014-09-30 13F GALLAGHER ARTHUR J COM 363576109 76,644 0 0.00 3,477 -2.66 0.7719
2014-07-23 2014-06-30 13F GALLAGHER ARTHUR J COM 363576109 76,644 0 0.00 3,572 -2.06 0.7644
2014-05-15 2014-03-31 13F GALLAGHER ARTHUR J COM 363576109 76,644 -10,000 -11.54 3,647 -10.30 0.8543
2014-02-07 2013-12-31 13F GALLAGHER ARTHUR J COM 363576109 86,644 0 0.00 4,066 7.51 1.0218
2013-10-30 2013-09-30 13F GALLAGHER ARTHUR J COM 363576109 86,644 3,782
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.