Roughly 2 out of 3 “fund selectors” think individual investors should not own cryptocurrency in their portfolios, mainly citing transparency and regulation, according to a Natixis Investment Managers survey. 

Fund selectors at brokerage houses, financial advisory shops, private banks and other institutions analyze and choose the investments their firms offer customers.

69% percent don’t believe that individuals should be able to access crypto, according to the survey, which polled 141 U.S. investment executives at firms that manage $2.7 trillion in client assets.

Nonetheless, the negative sentiment could be hit by the high adoption of cryptocurrencies such as Bitcoin (BTC) and Ethereum (ETH), especially among younger investors. Forty percent of survey respondents stated that their clients are increasingly asking for crypto assets.

Meanwhile, over 10% of investors own cryptocurrencies. This puts cryptos behind real estate, stocks, mutual funds, and bonds, according to a CNBC survey published in August. Two-thirds of them invested in the digital assets over the last year.

However, a huge number of professional investors are still bearish on cryptocurrencies. Many of them are worried about crypto transparency and lack of regulation, according to Dave Goodsell, executive director of the Natixis Center for Investor Insight.

About 87% agreed crypto assets need to be more transparent, and 84% think they will need some type of regulatory oversight, according to the firm’s survey, published Tuesday.

“I think that makes it challenging to recommend such things if they’re in a fiduciary role,” Goodsell said, referencing the legal duty some firms owe their clients. “I think that’s where the hesitancy comes from.”