Marex Group Ltd

Appendix 1

Non-IFRS Financial Measures and Key Performance Indicators

This press release contains non-IFRS financial measures, including Adjusted Profit Before Tax, Adjusted Profit Before Tax Margin, Adjusted Basic Earnings per Share, Adjusted Diluted Earnings per Share, Adjusted Profit After Tax Attributable to Common Equity and Adjusted Return on Equity. These non-IFRS financial measures are presented for supplemental informational purposes only and should not be considered a substitute for profit after tax, profit margin, return on equity or any other financial information presented in accordance with IFRS and may be different from similarly titled non-IFRS financial measures used by other companies.

Adjusted Profit Before Tax

We define Adjusted Profit Before Tax as profit after tax from continuing operations adjusted for (i) tax, (ii) goodwill impairment charges, (iii) merger and acquisition costs (iv) bargain purchase gains, (v) owner fees, (vi) amortization of acquired brands and customer lists, (vii) activities in relation to shareholders, (viii) employer tax on the vesting of Growth Shares, (ix) IPO preparation costs, (x) fair value of the cash settlement option on the Growth Shares, (xi) public offering of ordinary shares and (xii) redomiciliation costs. Items (i) to (xii) are referred to as “Adjusting Items.” Adjusting Items are excluded because they are not reflective of our ongoing underlying trading performance. They typically relate to acquisition accounting, shareholder-related activities and other non-recurring items, which can vary significantly between periods and are not considered part of the Group’s core operations.

The Group has expanded its definition of acquisition costs, relabeling this item as Merger & Acquisition (M&A) activity to better reflect the broader range of transactions now captured. The Group undertakes acquisition activity as part of its business strategy, and M&A-related costs may therefore recur from period to period. Management generally excludes costs arising from transactions outside the Group's normal course of M&A activity in support of its core business, such as the acquisition and disposal of Winterflood Custody Business, which was non-operating in nature and unrelated to the Group's ongoing trading activities. Costs from routine, bolt-on acquisitions are typically not excluded, as these are considered part of the underlying cost base of the business. Each item is assessed by management on its individual facts and circumstances.

Adjusted Profit Before Tax is an important measure used by our management to evaluate and understand our underlying operations and business trends, forecast future results and determine future capital investment allocations. Adjusted Profit Before Tax is the measure used by our executive board to assess the financial performance of our business in relation to our trading performance. The most directly comparable IFRS Accounting Standards measure is profit after tax from continuing operations.

We believe Adjusted Profit Before Tax is a useful measure as it allows management to monitor our ongoing core operations and provides useful information to investors and analysts regarding the net results of the business. The core operations represent the primary trading operations of the business.

Adjusted Profit Before Tax Margin

We define Adjusted Profit Before Tax Margin as Adjusted Profit Before Tax (as defined above) divided by revenue. We believe that Adjusted Profit Before Tax Margin is a useful measure as it allows management to assess the profitability of our business in relation to revenue.

IFRS accounting standards do not define profit margin. Therefore the most directly comparable IFRS measure for profit margin is Profit After Tax divided by revenue.

Adjusted Profit After Tax Attributable to Common Equity

We define Adjusted Profit After Tax Attributable to Common Equity as profit after tax adjusted for the items outlined in the Adjusted Profit Before Tax paragraph above. Additionally, Adjusted Profit After Tax Attributable to Common Equity is also adjusted for (i) tax and the tax effect of the Adjusting Items to calculate Adjusted Profit Before Tax and (ii) profit attributable to AT1 and hybrid perpetual note holders, which is the coupons on the AT1 and hybrid perpetual issuances and accounted for as dividends, adjusted for the tax benefit of the coupons, and (iii) profit attributable to non-controlling interest.

We define Common Equity as being the equity belonging to the holders of the Group’s share capital. We believe Adjusted Profit After Tax Attributable to Common Equity is a useful measure as it allows management to assess the profitability of the equity belonging to the holders of the Group’s share capital.

The most directly comparable IFRS Accounting Standards measure is profit after tax.

Adjusted Return on Equity

We define the Adjusted Return on Equity as the Adjusted Profit After Tax Attributable to Common Equity (as defined above) divided by the average Common Equity for the period.

Common Equity is defined as being the equity belonging to the holders of the Group’s share capital, excluding additional Tier 1 capital, hybrid perpetual instruments and non-controlling interest. Average Common Equity for a three-month period is calculated using the opening and closing quarter-end balances. For a nine-month period, it is calculated using the balances at December 31 of the prior year, March 31, June 30 and September 30 of the current year. For the three months ended 30 September 2026 and 2025, Adjusted Return on Equity is calculated for comparison purposes on an annualized basis as Adjusted Profit After Tax Attributable to Common Equity for the period multiplied by four and then divided by average Common Equity for the period. For the nine months ended 30 September 2026 and 2025, Adjusted Return on Equity is calculated for comparison purposes on an annualized basis as Adjusted Profit After Tax Attributable to Common Equity for the period divided by nine and multiplied by twelve and then divided by average Common Equity for the period.