Appendix

CSR priorities assessment

In 2022, we conducted a comprehensive assessment of our priorities, actively soliciting stakeholder input and insights. Our engagement with various stakeholder groups involved the distribution of online surveys among our employees, mining client environmental and social preferences through publicly available data, and integrating investor feedback gathered through our ongoing outreach efforts.

We organized the critical feedback and mapped the relative importance of each topic, factoring in both stakeholder input and their significance to our business. This effort deepened our understanding of the priorities that hold the most relevance for our stakeholders and their impact on our business. This understanding forms the basis for communicating our priorities and engaging with stakeholders on our progress. We continue to review our progress on these initiatives and anticipate periodically adjusting this framework to capture emerging issues and their evolving importance to both our business and our stakeholders.

_{^{Fig. 15. A graph of Huron’s CSR priorities}}

Sustainability Accounting Standards Board (SASB) addendum

Beginning in our 2020 CSR report, we disclosed additional quantitative and qualitative information aligned to the Sustainability Accounting Standards Board (SASB) and the guidance for the professional and commercial services industry. We aligned to SASB because of its industry-specific and materiality-focused approach. In 2022, the International Sustainability Standards Board (ISSB) of the International Financial Reporting Standards (IFRS) Foundation assumed responsibility for the SASB Standards. We have used the most updated standards identified by ISSB as material for our industry sector in the following table.

_{^{Fig. 16. A table of Huron’s SASB reporting}}

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_{^{*View Huron's Insider Trading Policy here.}}

_{^{*View Huron's Code of Business Conduct and Ethics here.}}

_{^{*View Huron's Anti-Bribery and Corruption Policy here.}}

EEO-1 Statement

We are an equal opportunity employer. Our EEO-1 Statement is prepared in accordance with government requirements. The job categories used by the U.S. government are different from our job levels and are on a different reporting cycle. The data reflected in our last EEO-1 statement is as of 12/31/2023. As a result, we encourage you to review the body of our Corporate Social Responsibility report for insights about our workforce demographics for 2024.

_{^{Fig. 17. A table of Huron’s EEO-1 Statement data}}

_{^{*We have no technicians, sales workers, craft workers, operatives, laborers and helpers, or service workers in our EEO-1 report as of Dec. 31, 2023. We also have not included our previous report totals.}}

Data

_{^{Fig. 18. A table of Huron’s environmental data}}

_{^{Fig. 19. A table of Huron’s social data}}

GHG emissions calculations methodology

Huron’s GHG emissions calculations were completed by AccountAbility, a global consulting and standards firm that works with organizations on CSR matters. The structure of Huron’s emissions calculations was based on the Greenhouse Gas (GHG) Protocol’s Corporate Standard Revised Edition. While Huron continues to improve data collection processes, several types of activity data were not readily available. As such, Huron’s GHG calculations were limited to minimum recommended inclusions for professional services office-based environments.

Scope 1: Emissions that occur from sources that are controlled or owned by Huron

Activity data

Stationary combustion: Stationary combustion refers to the combustion of fuels that are purchased by Huron and/or consumed at Huron’s office locations, including for activities such as office heating or on-site electricity generation or in equipment such as generators, boilers, furnaces and other types of stationary fuel combustion technologies owned, leased or controlled by Huron.

Stationary combustion activity data has been estimated for all offices based on Huron's total office location square footage (excluding sub-leased buildings, floors, and portions of floors) and U.S. Energy Information Administration (EIA) average energy consumption data for regional for US offices. In the absence of international averages, the same US average was also used for Huron’s overseas offices.

Huron did not report any mobile combustion emissions since the company does not own any company-owned vehicles.

Due to the nature of Huron’s office lease agreements, as per the GHG Protocol (revised edition), refrigerants (fugitive emissions from office air conditioning maintenance) do not fall under the category of “owned or controlled” activities for Huron.

Emissions factors

Emissions factors for stationary combustion were applied using the emission factors for greenhouse gas inventories provided by the U.S. Environmental Protection Agency (last modified June 2024) and the U.S. Energy Information Administration (EIA) average energy consumption data (last modified 2018).

Scope 2: Indirect emissions that are associated with purchased electricity consumed by Huron

Activity data

Purchased electricity: Purchased electricity refers to electricity supplied to Huron’s office locations by local utility providers or other off-site sources.

Multiple office locations collected data on actual electricity consumption in 2023. Some usage needed to be annualized for an estimated annual consumption. Due to the limited availability of a number of domestic and overseas offices’ purchased electricity data, purchased electricity activity has been estimated based on an extrapolation of the actual electricity consumption of Huron’s Chicago office (the company’s headquarters) being proportionally applied by square footage for Huron’s total office footprint (excluding sub-leased buildings, floors, and portions of floors except where Huron continues to pay the electricity bill) for locations without actual energy usage.

Emissions factors

Domestic: Emission factors for Greenhouse Gas Inventories provided by the U.S. Environmental Protection Agency (last modified June 2024).

Overseas: Country-specific electricity grid greenhouse gas emission factors provided by carbonfootprint.com (last modified February 2023).

Scope 3: Emissions that are the result of activities from assets not owned or controlled by Huron, but that our organization indirectly impacts in our value chain

Activity data

Air business travel: Air business travel refers to the use of aircraft not owned or leased by Huron (i.e., commercial airplanes) for Huron business travel.

Due to the limited availability of complete actual air business travel activity data, the complete actual air business travel activity data available (representing 49% of total air travel activity in 2019, 62% of total air travel activity in 2020, 66% of total air travel in 2021, and 70% of total air travel activity in 2024) has been extrapolated and applied to the remaining total of air business travel activity.

Non-air business travel: Non-air business travel refers to the use of vehicles not owned or leased by Huron (i.e., rental cars, train travel, bus travel, ferry travel, etc.) for Huron business travel.

Non-air business travel activity data has been estimated based on rental car and gas expense data, Huron’s assumption about certain expenses for gasoline charges, and the EIA monthly retail gasoline price data.

Non-air business train travel activity data (representing 70% of total train travel activity in 2022 and 2023) has been extrapolated and applied to the remaining total of train travel activity. The activity data, distance between train stations, and EPA emission factors with train types in the U.S. were used to calculate emissions. In 2023, Huron revised its methodology for calculating train travel emissions, including updating the emission factors and associated reporting units from 2022 (when it first reported train travel emissions). Reporting units were updated from rail miles in 2022 to rail passenger-miles and the emission factors included those provided by the EPA (last updated: September 2023). This methodology update is in alignment with industry standards using EPA emission factors and passenger-miles for train travel emissions. Huron did not recalculate its 2022 scope 3 emissions, but if this updated methodology was used in 2022, scope 3 emissions would have been about 13% lower.

Emissions factors

Emissions factors for air and non-air business travel were applied using the Greenhouse Gas Inventories, provided by the U.S. Environmental Protection Agency (last modified June 2024).

_{^{*Disclaimer: These GHG emissions calculations cover only the emissions-producing activities listed, are estimated using the methods, emissions factors, and assumptions detailed above, and are not exhaustive of all of Huron’s GHG emissions-producing activities.}}