The claim is true because multiple reliable sources, including court transcripts and grand jury reports, confirm that 14 of the 23 grand jurors voted in favor of indicting James Comey on the two counts that proceeded.
According to the court transcript, only 14 of the 23 grand jurors voted in favor of indicting James Comey on the two counts that went forward.

Inside the seven tumultuous days that led to the James Comey indictment - CNN Politics
Source: cnn.com
Key Evidence
Court transcripts and judge announcements state that 14 out of 23 grand jurors voted to indict Comey on two counts. Multiple independent news organizations (CNN, CBS News) report this same figure and note that one additional count was rejected by the grand jury.
What the Evidence Shows
According to the available sources, the grand jury considered three proposed counts against James Comey but ultimately indicted him on two counts: making false statements to Congress and obstructing a congressional proceeding. The court transcript and grand jury foreperson statements reveal that out of a total of 23 grand jurors, 14 voted in favor of indicting Comey on these two counts. This majority vote was sufficient to move forward with the indictment.
Multiple news outlets such as CNN, CBS News, and The Guardian consistently report this figure and detail the rejection of a third count by the grand jury. The judge publicly announced these details during court proceedings, further corroborating the information. There is no credible contradictory evidence disputing the number of jurors or the vote count.