There are only two "resurrections". However, this must be clarified. Dr. Fruchtenbaum explains:
The first resurrection involves the resurrection of believers only. It is recorded in Revelation 20:5–6:
The rest of the dead lived not until the thousand years should be finished. This is the first resurrection. Blessed and holy is he that has part in the first resurrection: over these the second death has no power; but they shall be priests of God and of Christ, and shall reign with him a thousand years.
According to verse 5, the resurrection of the tribulation saints completes the first resurrection. It is separated from the completion of the second resurrection by a thousand years. The point of verse 6 is that the first resurrection involves believers only, and that is why it is blessed and holy to be a participant in the first resurrection.
However,
the first resurrection is not a general, one-time resurrection of righteous ones but comes in stages, in an orderly progression, according to 1 Corinthians 15:20–23:
But now has Christ been raised from the dead, the first-fruits of them that are asleep. For since by man came death, by man came also the resurrection of the dead. For as in Adam all die, so also in Christ shall all be made alive. But each in his own order: Christ the first-fruits; then they that are Christ’s, at his coming.
After declaring that a resurrection of the righteous will occur (vv. 20–22), Paul states that the righteous will be resurrected each in his own order (v. 23). The word translated order is a military term used for “the sequence of troops of soldiers marching in a procession or in battle.” There is one troop division, followed by another troop division, and so on. The point is that all the righteous will not be resurrected at the same time, but rather, in a definite, sequential order.
The first of these orders was the Resurrection of Yeshua the Messiah (v. 23); He is the first-fruits of the first resurrection. Second, is the resurrection of church saints at the Rapture of the Church prior to the Great Tribulation (1 Thes. 4:16). Next, will come the Old Testament saints during the Seventy-five Day Interval after the Tribulation (Is. 26:19; Dan. 12:2); and finally, the tribulation saints (Rev. 20:4).
The resurrection of the tribulation saints completes the first resurrection.
The next [second] resurrection that occurs will be that of the unbelievers one thousand years later for the Great White Throne Judgment and before the Lake of Fire.
Arnold G. Fruchtenbaum, vol. 42, The Messianic Bible Study Collection (Tustin, CA: Ariel Ministries, 1983), 10-11.