From Revelation 1:3 "John, To the seven churches in the province of Asia: Grace and peace to you from him who is, and who was, and who is to come, and from the seven spirits before his throne, and from Jesus Christ . . .”
The seven spirits are God's:
Revelation 4:5 “From the throne came flashes of lightning, rumblings and peals of thunder. In front of the throne, seven lamps were blazing. These are the seven spirits of God.”
The seven spirits of the Lord is the Holy Spirit:
Isaiah 11:2
The Spirit of the Lord will rest on him—
the Spirit of wisdom and of understanding,
the Spirit of counsel and of might,
the Spirit of the knowledge and fear of the Lord—
The spirits:
1) The Spirit of the LORD
2) The Spirit of wisdom
3) The Spirit of understanding
4) The Spirit of counsel
5) The Spirit of power
6) The Spirit of knowledge
7) The Spirit of the fear of the Lord
Jesus has the seven spirits:
Revelation 5:6 “Then I saw a Lamb, looking as if it had been slain, standing at the center of the throne, encircled by the four living creatures and the elders. The Lamb had seven horns and seven eyes, which are the seven spirits of God sent out into all the earth.”
So the Trinity is present in all seven spirits.