All other revenue, which consists of information services, post-trade services and other revenue, increased to $19.9 million, compared to $12.7 million for the second quarter of 2020. The increase in all other revenue was principally due to $3.8 million of regulatory trade reporting revenue generated by Regulatory Reporting Hub, which was acquired from Deutsche Börse Group in November 2020, and $1.3 million of revenue due to the weaker U.S. dollar to U.K. pound sterling exchange rate.
Total expenses for the second quarter of 2021 increased 10.5% to $89.2 million, compared to $80.7 million for the second quarter of 2020. The increase in total expenses was largely due to higher depreciation and amortization of $4.8 million, which includes $2.8 million of acquired intangibles expense; higher professional and consulting fees of $2.6 million, mainly attributable to non-recurring integration costs associated with the Regulatory Reporting Hub transaction of $1.3 million and self-clearing consulting fees of $0.7 million; and higher technology and communication costs of $2.0 million which was partially offset by a decrease in clearing costs of $1.3 million. Expenses in the second quarter of 2021 reflect operating expenses and costs associated with the MuniBrokers and Regulatory Reporting Hub businessess totaling $5.1 million. Excluding the MuniBrokers and Regulatory Reporting Hub expenses, total expenses for the quarter were up 4.2%.
The effective tax rate for the second quarter of 2021 was 21.8%, compared to 19.7% for the second quarter of 2020. The income tax provision for the second quarter of 2021 and 2020 reflected $5.6 million and $5.7 million, respectively, of excess tax benefits related to share-based compensation awards.
Employee headcount was 637 as of June 30, 2021 compared to 561 as of June 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 August 18, 2021 to stockholders of record as of the close of business on August 4, 2021.
Share Repurchases
A total of 28,701 shares were repurchased in the second quarter of 2021 at a cost of $13.4 million.
Balance Sheet Data
As of June 30, 2021, total assets were $1.5 billion and included $449.5 million in cash, cash equivalents and investments. Total stockholders’ equity as of June 30, 2021 was $1.0 billion.
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.
2