From the article from the hill that someone linked to earlier:
More than half of the memos former FBI chief James Comey wrote as personal recollections of his conversations with President Trump about the Russia investigation have been determined to contain classified information, according to interviews with officials familiar with the documents.
This revelation raises the possibility that Comey broke his own agency’s rules and ignored the same security protocol that he publicly criticized Hillary Clinton for in the waning days of the 2016 presidential election.
Comey testified last month he considered the memos to be personal documents and that he shared at least one of them with a Columbia University lawyer friend. He asked that lawyer to leak information from one memo to the news media in hopes of increasing pressure to get a special prosecutor named in the Russia case after Comey was fired as FBI director.
“So you didn’t consider your memo or your sense of that conversation to be a government document?,” Sen. Roy Blunt (R-Mo.) asked Comey on June 8. “You considered it to be, somehow, your own personal document that you could share to the media as you wanted through a friend?”
“Correct,” Comey answered. “I understood this to be my recollection recorded of my conversation with the president. As a private citizen, I thought it important to get it out.”
Comey insisted in his testimony he believed his personal memos were unclassified, though he hinted one or two documents he created might have been contained classified information.
But when the seven memos Comey wrote regarding his nine conversations with Trump about Russia earlier this year were shown to Congress in recent days, the FBI claimed all were, in fact, deemed to be government documents.
While the Comey memos have been previously reported, this is the first time there has been a number connected to the amount of the memos the ex-FBI chief wrote.
Four of the memos had markings making clear they contained information classified at the “secret” or “confidential” level, according to officials directly familiar with the matter.
Congressional investigators had already begun examining whether Comey’s creation, storage and sharing of the memos violated FBI rules, but the revelation that four of the seven memos included some sort of classified information opens a new door of inquiry into whether classified information was mishandled, improperly stored or improperly shared.
Now,congressional investigators are likely to turn their attention to the same issues to determine if Comey mishandled any classified information in his personal memos.
In order to make an assessment, congressional investigators will have to tackle key questions, such as:
Where and how were the memos were created, such as whether they were written on an insecure computer or notepad.
Where and how the memos were stored, such as inside his home, his briefcase or an insecure laptop.
Were any memos shown to private individuals without a security clearance and did those memos contain any classified information
When was it determined by the government that the memos contained classified information, before Comey took them and shared one or after.
One avenue for answering those questions is for a panel like Senate Intelligence, House Intelligence or Senate Judiciary to refer the matter to the Justice Department’s internal watchdog, the inspector general, or to the Director of National Intelligence and its inspector general, aides said.
So I'm not sure if the one he sent to his friend to give to the press was deemed as classified but I suppose that would fall under a committe investigation