Viant sees Q4 revenue $52M-$57M, consensus $81.65M

For Q4, sees: Contribution ex-TAC in the range of $32.0 million to $35.5 million; Advertiser spend decrease of 20% to 11% on a year-over-year basis; Adjusted EBITDA in the range of $(1.5) million to $1.0 million.