U.S. regulators are taking a step toward increasing their oversight of Treasurys in response to complaints from both traders and government officials that the market is too opaque.

The Treasury Department on Tuesday plans to ask for input on how the market has changed and what should be done so that it can operate more smoothly. Regulators want to prevent the kind of sudden price swings that occurred on Oct. 15, 2014. On that day, yields fluctuated in a way that had only happened three other times since 1998, and unlike the earlier incidents, there was no obvious catalyst.

Finance executives have argued that rules passed after the 2008 crisis have sucked up liquidity in debt markets by forcing banks to reduce their trading and hoard high-quality assets like Treasurys. Treasury officials including Secretary Jacob J. Lew have pushed back, saying regulations passed under the Dodd-Frank Act didn’t play a significant role in what happened to Treasurys in October 2014.

Treasury’s request for information asks industry to what extent can trading in Treasury cash and futures markets be monitored effectively. Department officials have said the quality of data available to regulators must be improved. The request, obtained by Bloomberg News, also solicits views on the potential costs and benefits of additional transparency in the trading of Treasurys.

The Treasury put together the document with the other agencies that regulate Treasury markets: The Federal Reserve, New York Fed, Securities and Exchange Commission and Commodity Futures Trading Commission. The public has 60 days to submit comments.

In July, those agencies released a report saying the Treasury market’s swings on Oct. 15, 2014, resulted in part from activity by both banks and high-frequency traders.