Fed chair’s official schedule from that March. Those calendars generally track scheduled events, and may have missed meetings in early 2020 when staff members were frantically working on the market rescue and the Fed was shifting to work from home, a central bank spokesman said.

Mr. Powell’s calendars did show that he talked to Mr. Fink in March, April and May, and he has previously answered questions about those discussions.

“I can’t recall exactly what those conversations were, but they would have been about what he is seeing in the markets and things like that, to generally exchanging information,” Mr. Powell said at a July news conference, adding that it wasn’t “very many” conversations. “He’s typically trying to make sure that we are getting good service from the company that he founded and leads.”

BlackRock’s connections to Washington are not new. It was a critical player in the 2008 crisis response, when the New York Fed retained the firm’s advisory arm to manage the mortgage assets of the insurance giant American International Group and Bear Stearns.

Several former BlackRock employees have been named to top roles in President Biden’s administration, including Brian Deese, who heads the White House National Economic Council, and Wally Adeyemo, who was Mr. Fink’s chief of staff and is now the No. 2 official at the Treasury.

in early 2009 to $7.4 trillion in 2019. By the end of last year, they were $8.7 trillion.

As it expanded, it has stepped up its lobbying. In 2004, BlackRock Inc. registered two lobbyists and spent less than $200,000 on its efforts. By 2019 it had 20 lobbyists and spent nearly $2.5 million, though that declined slightly last year, based on OpenSecrets data. Campaign contributions tied to the firm also jumped, touching $1.7 million in 2020 (80 percent to Democrats, 20 percent to Republicans) from next to nothing as recently as 2004.

short-term debt markets that came under intense stress as people and companies rushed to move all of their holdings into cash. And problems were brewing in the corporate debt market, including in exchange-traded funds, which track bundles of corporate debt and other assets but trade like stocks. Corporate bonds were difficult to trade and near impossible to issue in mid-March 2020. Prices on some high-grade corporate debt E.T.F.s, including one of BlackRock’s, were out of whack relative to the values of the underlying assets, which is unusual.

People could still pull their money from E.T.F.s, which both the industry and several outside academics have heralded as a sign of their resiliency. But investors would have had to take a financial hit to do so, relative to the quoted value of the underlying bonds. That could have bruised the product’s reputation in the eyes of some retail savers.

fund recovery was nearly instant.

When the New York Fed retained BlackRock’s advisory arm to make the purchases, it rapidly disclosed details of those contracts to the public. The firm did the program cheaply for the government, waiving fees for exchange-traded fund buying and rebating fees from its own iShares E.T.F.s back to the New York Fed.

The Fed has explained the decision to hire the advisory side of the house in terms of practicality.

“We hired BlackRock for their expertise in these markets,” Mr. Powell has since said in defense of the rapid move. “It was done very quickly due to the urgency and need for their expertise.”

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Gary Gensler, Wall Street’s New Watchdog, Has a Full Plate

Mr. Gelzinis said Mr. Gensler would probably draw on his familiarity with the subject matter — he taught classes on blockchain technology at the Massachusetts Institute of Technology — to approach regulation around digital currencies more strategically. That would be a departure from his predecessor Jay Clayton, who favored enforcement actions against initial coin offerings without providing much regulatory guidance, he added.

Paul Grewal, chief counsel of Coinbase, the cryptocurrency exchange that went public last week, said the industry was “hopeful” about Mr. Gensler, noting that he is fluent in its language. Mr. Grewal said the industry wanted Mr. Gensler to provide clarity on how securities regulators decide when a digital asset is considered a security and subject to S.E.C. review, as opposed to a currency that is largely free from S.E.C. oversight.

The question grew in importance after the S.E.C. sued the San Francisco company Ripple Labs in December over the sale of its popular digital tokens to the public. The S.E.C. said the company was selling unregistered securities, while Ripple and others said the tokens should be classified as a digital currency. The enforcement action was one of the last brought before Mr. Clayton stepped down as chairman in the waning days of the Trump administration.

More recently, a brokerage affiliated with Sustainable Holdings, a financial technology company, asked the S.E.C. to weigh in on whether nonfungible tokens, which are being used to create digital art, are securities that require registration. The company, in its letter, asked the S.E.C. “to engage in a meaningful discussion of how to regulate fintech companies and individuals that are creating NFTs that may be deemed digital asset securities.”

Mr. Gensler, while teaching at M.I.T., acknowledged that regulators had struggled with how to treat digital assets. In a 2018 interview, he said digital assets could at times appear to be both a commodity and a security. At his Senate confirmation hearing, Mr. Gensler spoke strongly for heightened requirements for companies to disclose climate risks and diversity efforts.

“Diversity in boards and senior leadership benefits decision-making,” he said.

Mr. Gensler declined to be interviewed.

One thing the past three months have shown is that the stock and bond markets have a way of quickly writing the agenda for anyone who leads the S.E.C. That means SPACs will almost certainly be scrutinized. In particular, Mr. Gensler will have to determine whether these blank-check companies are a good market innovation for taking fledgling companies public or an investment vehicle that has the potential to harm retail investors, Mr. Hawke of Arnold & Porter said.

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