Acts 20:4

And there accompanied him as far as Asia, Sopater of Berea, the son of Pyrrhus; and of the Thessalonians, Aristarchus and Secundus; and Gaius of Derbe, and Timothy; and of Asia, Tychicus and Trophimus.

It is noteworthy that Paul took no chance of handling the money he had collected without taking the utmost precautions, not only for the safety of the funds, but also to avoid any charge of laxity on his part. He was not about to carry that large sum to Jerusalem without attendants and witnesses of the whole transaction. One may observe that Macedonian congregations were represented by Sopater, Aristarchus and Secundus; the Galatian congregations were represented by Gaius of Derbe and Timothy of Lystra; the ones in Asia were represented by Tychicus and Trophimus; and it may be inferred from 2 Corinthians 8:6ff that the Corinthian contribution was entrusted to Titus and two other brethren sent by Paul to Corinth to receive it.

Regarding the reason why Titus was not named here, or anywhere else in Acts, it is thought strange that one whose name appears in Paul's letters as a trusted and faithful helper, even one of the New Testament books being addressed to him, - that one of his standing should not be mentioned in Acts. We agree with Bruce that:

It would be difficult to find a more convincing answer than that suggested by Ramsay, namely, that Titus was Luke's brother.[4] It may be that when the "we" narrative is resumed in Acts 20:5, Titus as well as Luke himself is tacitly included.[5]

[4] Sir William M. Ramsay, St. Paul the Traveller, pp. 38:390.

[5] F. F. Bruce, The Book of Acts (Grand Rapids, Michigan: Wm. B. Eerdmans, Publishers, 1954), p. 406.