Last year, S&P 500 member firms boosted spending on share buybacks by 16.3% to $553.3 billion from $475.6 billion. That was not far off the record set in 2007 when S&P 500 members bought back $589.1 billion of their own shares.

While plenty of large-cap stocks and the corresponding exchange traded funds have benefited from the jump in share repurchases, small-cap ETFs are also getting a lift from increased buybacks courtesy of smaller companies.

Since the end of 2013, small-cap companies that repurchased their own shares outpaced rivals that did not by 2.7%, the Wall Street Journal reports, citing Venu Krishna, a Barclays Capital. Krishna’s analysis was based on stocks in the Russell 2000, the benchmark for ETFs such as the iShares Russell 2000 ETF (NYSEArca: IWM) and the SPDR Russell 2000 ETF (NYSEArca: TWOK). [Small-Cap ETF Differences are big Deals]

The good news for small-cap ETF investors is that companies held by IWM, TWOK and rival funds are picking up the buyback pace this year. “In the first quarter of 2015, small-cap companies’ buybacks rose 3.4% when measured in terms of dollars spent,” according to the Journal.

Important to investors is just how sustainable the trend of rising small-cap buybacks is. The answer to that query is there is plenty of gas left in the small-cap share repurchase tank. Barclays notes that the 11.2% of capital allocated by smaller companies to buybacks is below the pre-financial crisis median level of 12.4%.