All other revenue, which consists of information services, post-trade services and other revenue, increased to $19.3 million, compared to $13.4 million for the third quarter of 2020. The increase in all other revenue was principally due to $3.4 million of regulatory trade reporting revenue generated by Regulatory Reporting Hub, which was acquired from Deutsche Börse Group in November 2020, net new post-trade services contract revenue of $1.1 million, net new data sales of $0.9 million and $0.5 million of revenue due to the weaker U.S. dollar to U.K. pound sterling exchange rate.
Total expenses for the third quarter of 2021 increased 15.6% to $88.1 million, compared to $76.2 million for the third quarter of 2020. The increase in total expenses was largely due to higher depreciation and amortization of $4.9 million, which includes acquired intangibles expense of $3.2 million; higher professional and consulting fees of $2.6 million, mainly attributable to non-recurring integration costs associated with the Regulatory Reporting Hub transaction of $1.1 million and IT consulting fees of $0.9 million; and higher technology and communication costs of $2.2 million which was partially offset by a decrease in clearing costs of $1.6 million. Expenses in the third quarter of 2021 reflect operating expenses and costs associated with the MuniBrokers and Regulatory Reporting Hub businesses totaling $5.5 million. Excluding the MuniBrokers and Regulatory Reporting Hub expenses, total expenses for the quarter were up 8.4%.
The effective tax rate for the third quarter of 2021 was 22.2%, compared to 23.0% for the third quarter of 2020. The income tax provision for the third quarter of 2021 and 2020 reflected $1.7 million and $5.9 million, respectively, of excess tax benefits related to share-based compensation awards.
Employee headcount was 671 as of September 30, 2021 compared to 599 as of September 30, 2020. The increase in headcount was due to the continued investment in the Company’s growth initiatives, including geographic expansion, trading automation, new trading protocols and the transition to self-clearing.
Dividend
The Company’s board of directors declared a quarterly cash dividend to $0.66 per share of common stock outstanding, to be paid on November 17, 2021 to stockholders of record as of the close of business on November 3, 2021.
Share Repurchases
A total of 9,189 shares were repurchased in the third quarter of 2021 at a cost of $4.2 million.
Balance Sheet Data
As of September 30, 2021, total assets were $1.6 billion and included $468.5 million in cash, cash equivalents and investments. Total stockholders’ equity as of September 30, 2021 was $1.1 billion.
Updated Expense Guidance for 2021
The Company is updating its full year 2021 expense guidance range to $360.0 million to $365.0 million, down from a range of $370.0 million to $386.0 million. The updated expense guidance range reflects, among other items, lower incentive compensation and variable clearing costs.
Non-GAAP Financial Measures and Other Items
To supplement the Company’s unaudited financial statements presented in accordance with generally accepted accounting principles (“GAAP”), the Company uses certain non-GAAP measures of financial performance, including earnings before interest, taxes, depreciation and amortization (“EBITDA”) and free cash flow. The Company believes that these non-GAAP financial measures, when taken into consideration with the corresponding GAAP financial measures, are important in understanding the Company’s operating results. See the attached schedule for a reconciliation of GAAP net income to EBITDA and GAAP cash flow from operating activities to free cash flow.
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