respectively, and 229%, 266% and 164% for the years ended December 31, 2023, 2022 and 2021, respectively. Our total capital ratio is calculated by taking our total capital resources divided by the capital requirements under the IFPR during the relevant period. Our funding sources grew from $1.2 billion as of December 31, 2021 to $2.6 billion as of December 31, 2023, and our liquidity headroom grew from $475 million to $739 million over the same period and increased to $1,174.6 million as of June 30, 2024. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources.”
Strong Track Record of Organic Growth, Combined with Successful Acquisitions
Our growth has primarily been organic. This organic growth was supported by:
| • | | opening new offices to expand our geographic footprint and increase front-office headcount to broaden our distribution network; |
| • | | deepening expertise in adjacent product areas; |
| • | | cross-selling additional services to existing clients, and |
| • | | growth in client balances and rising interest rates. |
Our revenue grew at a CAGR of 52% from 2021 to 2023, and our revenue organic growth grew at a CAGR of 24% over the same period. Our revenue grew from $541.5 million for the year ended December 31, 2021 to $711.1 million for the year ended December 31, 2022, and of this growth, 68%, or $115.1 million, was attributable to organic growth and 32%, or $54.5 million, was attributable to acquisition-related growth. Our revenue then grew from $711.1 million for the year ended December 31, 2022 to $1,244.6 million for the year ended December 31, 2023, of which 32%, or $170.0 million, was attributable to organic growth and 68%, or $363.0 million, was attributable to acquisition-related growth. Our revenue grew from $622.4 million for the six months ended June 30, 2023 to $787.9 million for the six months ended June 30, 2024, of which 66%, or $109.0 million, was attributable to organic growth, and 34%, or $56.6 million, was attributable to acquisition-related growth.
Our profit after tax grew at a CAGR of 58% from 2021 to 2023, and our profit after tax attributable to our organic growth grew at a CAGR of 30% over the same period. Our profit after tax grew from $56.5 million for the year ended December 31, 2021 to $98.2 million for the year ended December 31, 2022, and of this growth, 85%, or $35.8 million, was attributable to organic growth and 14%, or $5.9 million, was attributable to acquisition-related growth. Our profit after tax then grew from $98.2 million for the year ended December 31, 2022 to $141.3 million for the year ended December 31, 2023, of which 20%, or $8.4 million, was attributable to organic growth and 81%, or $34.7 million, was attributable to acquisition-related growth. Our profit after tax grew from $80.8 million for the six months ended June 30, 2023 to $102.9 million for the six months ended June 30, 2024, of which 91%, or $20.1 million, was attributable to organic growth, and 9%, or $1.9 million, was attributable to acquisition-related growth.
Our Adjusted Operating Profit grew at a CAGR of 70% from 2021 to 2023, and our Adjusted Operating Profit attributable to our organic growth grew at a CAGR of 48% over the same period. Our Adjusted Operating Profit grew from $79.6 million for the year ended December 31, 2021 to $121.7 million for the year ended December 31, 2022, and of this growth, 83%, or $34.9 million, was attributable to organic growth and 17%, or $7.3 million, was attributable to acquisition-related growth. Our Adjusted Operating Profit then grew from $121.7 million for the year ended December 31, 2022 to $230.0 million for the year ended December 31, 2023, of which 55%, or $59.1 million, was attributable to organic growth and 45%, or $49.2 million, was attributable to acquisition-related growth. Our Adjusted Operating Profit increased 28% from $124.5 million for the six months ended June 30, 2023 to $159.2 million for the six months ended June 30, 2024, of which 91% or $32.0 million, was
153