Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionWalleye Capital LLC
Latest Disclosed Ownership204 shares
Latest Disclosed Value $ 44,182
Walleye Capital LLC ownership in AJG / Arthur J. Gallagher & Co.

On May 13, 2026 - Walleye Capital LLC filed a 13F-HR/A form disclosing ownership of 204 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $44,182 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 5 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 3,980.00% during the quarter.

Walleye Capital LLC 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 14,200 of underlying shares valued at $3,075,436 USD and put options representing 4,400 of underlying shares valued at $952,952 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)
2026-05-13 2026-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 204 199 3,980.00 44 4,300.00 0.0002
2026-05-08 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 204 199 44 0.0002
2026-02-13 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 5 -1,208 -99.59 1 -99.73 0.0000
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 1,213 -3,689 -75.25 376 -76.10 0.0014
2025-08-13 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 4,902 3,401 226.58 1,569 202.90 0.0061
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 1,501 -211,388 -99.29 518 -99.14 0.0023
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 212,889 204,095 2,320.84 60,429 2,342.52 0.1477
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 8,794 -6,314 -41.79 2,474 -36.84 0.0051
2024-08-14 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 15,108 -499 -3.20 3,918 0.38 0.0070
2024-05-15 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 15,607 -27,730 -63.99 3,902 -59.96 0.0070
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 43,337 -6,585 -13.19 9,746 -14.35 0.0207
2023-11-21 2023-09-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 49,922 15,496 45.01 11,379 50.54 0.0291
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 49,922 15,496 11,379 0.0293
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 34,426 -2,021 -5.55 7,559 8.41 0.0274
2023-05-15 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 36,447 -16,340 -30.95 6,973 -29.94 0.1045
2023-02-14 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 52,787 6,572 14.22 9,952 25.77 0.1815
2022-11-14 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 46,215 43,268 1,468.20 7,913 1,548.54 0.1510
2022-08-19 2022-06-30 13F/A-1 GALLAGHER ARTHUR J COM 363576109 2,947 2,947 480 0.0132
2022-08-08 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 2,947 2,947 480 0.0132
2022-05-27 2022-03-31 13F/A-01 GALLAGHER ARTHUR J COM 363576109 0 -2,483 -100.00 0 -100.00
2022-05-16 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 0 -2,483 0
2022-05-27 2021-12-31 13F/A-01 GALLAGHER ARTHUR J COM 363576109 2,483 -2,010 -44.74 421 -36.98 0.0131
2022-03-03 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 2,483 -2,010 421 0.0105
2021-11-15 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 4,493 4,493 668 0.0189
2021-08-16 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 0 -9,822 -100.00 0 -100.00
2021-05-17 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 9,822 9,822 1,225 0.0710
2021-02-16 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 0 -7,948 -100.00 0 -100.00
2020-11-16 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 7,948 7,948 839 0.0935
2019-08-14 2019-03-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 0 -6,539 -100.00 0 -100.00
2018-11-14 2018-09-30 13F GALLAGHER ARTHUR J COM 363576109 6,539 6,539 487 0.2273
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
(%)
2026-05-13 2026-03-31 13F/A GALLAGHER ARTHUR J COM Call 14,200 -8.97 3,075 -23.83 n/a n/a n/a
2026-05-08 2026-03-31 13F GALLAGHER ARTHUR J COM Call 14,200 3,075 n/a n/a n/a
2026-02-13 2025-12-31 13F GALLAGHER ARTHUR J COM Call 15,600 609.09 4,037 492.80 n/a n/a n/a
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM Call 2,200 -15.38 681 -18.15 n/a n/a n/a
2025-08-13 2025-06-30 13F GALLAGHER ARTHUR J COM Call 2,600 -29.73 832 -34.85 n/a n/a n/a
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM Call 3,700 -73.57 1,277 -67.86 n/a n/a n/a
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM Call 14,000 25.00 3,974 26.09 n/a n/a n/a
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM Call 11,200 67.16 3,151 81.40 n/a n/a n/a
2024-08-14 2024-06-30 13F GALLAGHER ARTHUR J COM Call 6,700 -60.36 1,737 -58.89 n/a n/a n/a
2024-05-15 2024-03-31 13F GALLAGHER ARTHUR J COM Call 16,900 134.72 4,226 160.96 n/a n/a n/a
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COM Call 7,200 242.86 1,619 238.70 n/a n/a n/a
2023-11-21 2023-09-30 13F/A GALLAGHER ARTHUR J COM Call 2,100 75.00 479 81.75 n/a n/a n/a
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM Call 2,100 479 n/a n/a n/a
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J COM Call 1,200 -75.51 263 -71.93 n/a n/a n/a
2023-05-15 2023-03-31 13F GALLAGHER ARTHUR J COM Call 4,900 937 n/a n/a n/a
Disclosed Put 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
(%)
2026-05-13 2026-03-31 13F/A GALLAGHER ARTHUR J COM Put 4,400 -25.42 953 -37.61 n/a n/a n/a
2026-05-08 2026-03-31 13F GALLAGHER ARTHUR J COM Put 4,400 953 n/a n/a n/a
2026-02-13 2025-12-31 13F GALLAGHER ARTHUR J COM Put 5,900 118.52 1,527 82.54 n/a n/a n/a
2025-11-14 2025-09-30 13F GALLAGHER ARTHUR J COM Put 2,700 -48.08 836 -49.76 n/a n/a n/a
2025-08-13 2025-06-30 13F GALLAGHER ARTHUR J COM Put 5,200 -40.91 1,665 -45.23 n/a n/a n/a
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM Put 8,800 87.23 3,038 127.74 n/a n/a n/a
2025-02-13 2024-12-31 13F GALLAGHER ARTHUR J COM Put 4,700 -87.16 1,334 -87.05 n/a n/a n/a
2024-11-14 2024-09-30 13F GALLAGHER ARTHUR J COM Put 36,600 -28.09 10,298 -21.97 n/a n/a n/a
2024-08-14 2024-06-30 13F GALLAGHER ARTHUR J COM Put 50,900 -6.43 13,199 -2.97 n/a n/a n/a
2024-05-15 2024-03-31 13F GALLAGHER ARTHUR J COM Put 54,400 130.51 13,602 156.30 n/a n/a n/a
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COM Put 23,600 -19.73 5,307 -20.80 n/a n/a n/a
2023-11-21 2023-09-30 13F/A GALLAGHER ARTHUR J COM Put 29,400 398.31 6,701 417.45 n/a n/a n/a
2023-11-14 2023-09-30 13F GALLAGHER ARTHUR J COM Put 29,400 6,701 n/a n/a n/a
2023-08-14 2023-06-30 13F GALLAGHER ARTHUR J COM Put 5,900 210.53 1,295 256.75 n/a n/a n/a
2023-05-15 2023-03-31 13F GALLAGHER ARTHUR J COM Put 1,900 363 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.