Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionNomura Holdings Inc
Latest Disclosed Ownership6,712 shares
Latest Disclosed Value $ 1,453,685
Nomura Holdings Inc ownership in AJG / Arthur J. Gallagher & Co.

On May 15, 2026 - Nomura Holdings Inc filed a 13F-HR form disclosing ownership of 6,712 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $1,453,685 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 6,512 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 3.07% during the quarter.

Nomura Holdings Inc has a history of taking positions in derivatives of the underlying security (AJG) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:AJG / Arthur J. Gallagher & Co. Historical Put/Call Ratio
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)
2026-05-15 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 6,712 200 3.07 1,454 -13.77 0.0030
2026-02-17 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 6,512 -1,124 -14.72 1,685 -28.75 0.0022
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 7,636 5,940 350.24 2,365 336.35 0.0037
2025-08-18 2025-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 1,696 -6,344 -78.91 543 -80.47 0.0011
2025-08-14 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 1,696 -6,344 543 0.0007
2025-05-15 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 8,040 -187 -2.27 2,776 18.84 0.0052
2025-02-14 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 8,227 8,227 2,335 0.0032
2025-01-13 2024-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 0 -3,159 -100.00 0 -100.00
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 0 0
2024-08-14 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 3,159 1,428 82.50 819 89.58 0.0016
2024-05-15 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,731 -2,621 -60.23 433 -55.83 0.0011
2024-03-27 2023-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 4,352 4,352 979 0.0027
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 4,352 4,352 979 0.0020
2021-11-15 2021-09-30 13F ARTHUR J GALLAGHER CMN 363576109 0 -70,062 -100.00 0 -100.00
2021-08-16 2021-06-30 13F ARTHUR J GALLAGHER CMN 363576109 70,062 68,155 3,573.94 9,825 0.0251
2021-05-17 2021-03-31 13F ARTHUR J GALLAGHER CMN 363576109 1,907 -5,049 -72.58 0 -72.21 0.0005
2021-02-16 2020-12-31 13F ARTHUR J GALLAGHER CMN 363576109 6,956 -6,297 -47.51 1 -100.00 0.0014
2020-11-12 2020-09-30 13F ARTHUR J GALLAGHER CMN 363576109 13,253 898 7.27 1,398 16.21 0.0031
2020-08-14 2020-06-30 13F ARTHUR J GALLAGHER CMN 363576109 12,355 12,355 1,203 0.0042
2018-08-17 2018-06-30 13F/A-1 ARTHUR J GALLAGHER CMN 363576109 0 -32,146 -100.00 0 -100.00
2018-05-14 2018-03-31 13F/A-1 ARTHUR J GALLAGHER CMN 363576109 32,146 -817 -2.48 2,207 5.70 0.0038
2018-05-14 2018-03-31 13F ARTHUR J GALLAGHER CMN 363576109 65,109 4,295
2018-02-14 2017-12-31 13F ARTHUR J GALLAGHER CMN 363576109 32,963 16,319 98.05 2,088 104.31 0.0037
2017-11-14 2017-09-30 13F ARTHUR J GALLAGHER CMN 363576109 16,644 -7,516 -31.11 1,022 -26.05 0.0021
2017-08-15 2017-06-30 13F ARTHUR J GALLAGHER CMN 363576109 24,160 17,032 238.95 1,382 242.93 0.0034
2017-05-18 2017-03-31 13F/A-1 ARTHUR J GALLAGHER CMN 363576109 7,128 -23,879 -77.01 403 -74.98 0.0010
2017-05-15 2017-03-31 13F ARTHUR J GALLAGHER CMN 363576109 7,128 403
2017-02-13 2016-12-31 13F ARTHUR J GALLAGHER CMN 363576109 31,007 31,007 0.00 1,611 0.0041
2016-05-16 2016-03-31 13F ARTHUR J GALLAGHER CMN 363576109 0 -14,256 -100.00 0 -100.00
2016-02-12 2015-12-31 13F ARTHUR J GALLAGHER CMN 363576109 14,256 4,816 51.02 584 48.60 0.0016
2015-11-16 2015-09-30 13F ARTHUR J GALLAGHER CMN 363576109 9,440 -36,897 -79.63 393 -82.07 0.0014
2015-08-14 2015-06-30 13F ARTHUR J GALLAGHER CMN 363576109 46,337 -6,880 -12.93 2,192 -11.76 0.0062
2015-05-15 2015-03-31 13F ARTHUR J GALLAGHER CMN 363576109 53,217 37,514 238.90 2,484 236.13 0.0081
2015-02-17 2014-12-31 13F ARTHUR J GALLAGHER CMN 363576109 15,703 -84,680 -84.36 739 -83.77 0.0020
2014-11-14 2014-09-30 13F ARTHUR J GALLAGHER CMN 363576109 100,383 52,705 110.54 4,553 105.28 0.0124
2014-08-13 2014-06-30 13F ARTHUR J GALLAGHER CMN 363576109 47,678 25,008 110.31 2,218 108.46 0.0006
2014-02-14 2013-12-31 13F ARTHUR J GALLAGHER CMN 363576109 22,670 5,711 33.68 1,064 43.78 0.0049
2013-11-14 2013-09-30 13F ARTHUR J GALLAGHER CMN 363576109 16,959 -18,446 -52.10 740 -51.48 0.0045
2013-08-15 2013-06-30 13F ARTHUR J GALLAGHER CMN 363576109 35,405 15,667 79.37 1,525 87.35 0.0124
2013-08-16 2013-03-31 13F/A-2 ARTHUR J GALLAGHER CMN 363576109 19,738 -14,445 -42.26 814 -31.31 0.0086
2013-08-16 2012-12-31 13F/A-1 ARTHUR J GALLAGHER CMN 363576109 34,183 34,183 1,185 0.0132
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-18 2025-06-30 13F/A GALLAGHER ARTHUR J COM Call 22,500 7,203 n/a n/a n/a
2025-08-14 2025-06-30 13F GALLAGHER ARTHUR J COM Call 22,500 7,203 n/a n/a n/a
2019-12-12 2019-09-30 13F/A ARTHUR J GALLAGHER CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2019-08-23 2019-06-30 13F/A ARTHUR J GALLAGHER CMN Call 69,700 6,207 n/a n/a n/a
2019-08-14 2019-06-30 13F ARTHUR J GALLAGHER CMN Call 69,700 6,207 n/a n/a n/a
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.