Christopher N. Gerosa
Chief Financial Officer at MarketAxess
Thank you, Chris. On slide 12, we provide a summary of our quarterly earnings performance. Fourth quarter revenue was $165 million, down 4% from the prior year, a 6% decrease in credit trading volume and lower overall credit fee capture resulted in a 6% decline in commissions. Partially offsetting this decline in commission revenue was the 9% increase in information services revenue and a 43% increase in post-trade services revenue. The $2.8 million increase in fourth quarter post-trade services revenue included $1.8 million of incremental revenue from reporting of acquisition.
The sequential decrease in other net is due to foreign currency transaction gains that did not repeat in the fourth quarter. The effective tax rate was 27.1% in the fourth quarter and our full-year effective tax rate came in at 22.8%. The higher effective tax rate in the quarter was due to lower excess tax benefits and return to provision adjustments related to new state income tax filing requirements. Fourth quarter EBITDA was $86.3 million and diluted EPS was $1.37.
On slide 13, we laid out our commission revenue, trading volumes and fees per million. The 11% decline in variable transaction fees was attributable to lower US credit trading volume and lower overall fee capture. The year-over-year decline in US high-grade fees per million was mainly due to shorter duration, which was driven by an increase in yields and a decrease in the average years to maturity of bonds traded on the platform. The year-over-year increase in other credit distribution fees was due to the migration of certain dealers to a high yield fixed fee plan from an all variable fee plan, and $1.2 million of subscription and license fees from the MuniBrokers acquisition.
Slide 14 provides fee expense detail. Fourth quarter expenses were up 16% year-over-year and include an incremental $5 million of operating expenses, amortization of acquired intangibles and non-recurring integration costs associated with the Reg Reporting Hub and MuniBrokers acquisitions. If we exclude these acquisition-related costs, expenses were up 10.1%.
The increase in compensation and benefits reflects higher salary and benefit expense as we continue to invest in talent to support our product and geographical expansion. The $4 million increase in depreciation and amortization expense includes $1.8 million of acquired intangible amortization expense from acquisitions and higher software development costs as we continue to invest in trading system enhancements. The 25% year-over-year decline in clearing cost is due to lower Open Trading volume and transaction cost savings from our clearing model conversions.
On slide 15, we provide an update on cash flow and capital management. As of December 31, our cash and investments were $543 million, and our trailing 12-month free cash flow was $297 million. During the fourth quarter, we paid out $25 million in quarterly dividends to our shareholders and repurchased approximately 112,000 shares for a total cost of $45 million. We exhausted the $100 million repurchase program that was approved last year, and our Board of Directors authorized a new $150 million share repurchase program. During the fourth quarter, we did not have any borrowings on a $500 million revolving credit facility, or the $200 million secured facility. Our Board of Directors approved a 6% increase in our regular quarterly dividend to $0.70.
On slide 16, we have our 2022 guidance for expenses, capital expenditures and the effective tax rate. We expect that total 2022 expenses will be in the range of $385 million to $415 million. Approximately 60% of the increase is due to our continued investment in the trading system and personnel to support our product and geographical expansion.
2022 capital expenditures are expected to range from $58 million to $62 million, of which roughly two-thirds relate to capitalized software development costs resulting from the investments we are making in new protocols and trading platform enhancements. We expect that the effective tax rate for full-year 2022 will be in the range of 24% and 26%. The increase in the effective tax rate versus 2021 is driven significantly lower estimated tax benefits related to share-based compensation awards.
Now let me turn the call over to Rick.