Australian Peter Greste and two other reporters working for Qatar-based Al-Jazeera English are among the 20 accused, in a trial that has triggered international outrage amid fears of growing media restrictions in Egypt.
"The court reserves June 23 to pronounce the verdict," said judge Mohamed Nagui Shehata at the hearing.
Egyptian prosecutors have demanded the maximum penalty of 15-25 years in jail for all defendants, but defence lawyers and relatives expect the accused to be acquitted.
The trial began on February 20.
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Of those on trial, 16 are Egyptians charged with joining the Brotherhood, which was designated a "terrorist" organisation in December during the intensifying crackdown that followed the army's overthrow of Islamist president Mohamed Morsi in July.
Four foreigners, including Greste, are charged with "spreading false news" and collaborating with and assisting the Egyptian defendants in their crimes by providing media material, as well as editing and publishing it.
Nine of the 20 defendants are in custody, with the rest being tried in absentia.
Prosecutors have presented audio recordings, photographs, maps and other material they say shows the accused had links to the Brotherhood and falsely portrayed Egypt as being in a state of "civil war" since Morsi's overthrow.
The trial is part of a relentless crackdown by the authorities.
More than 1,400 people have been killed, mostly Morsi's Islamist supporters, while more than 15,000 have been jailed.
Hundreds of them have been sentenced to death after speedy mass trials.