The 5 most valuable US tech companies are now worth more than $5 trillion after Alphabet's record close

· *Google-parent Alphabet soared to a $1 trillion valuation Thursday, pushing the total value of the five biggest tech companies to a record $5 trillion.*
· *Apple and Microsoft both boast market caps above the four-comma threshold, while Amazon sank to a $930 billion valuation after first breaching the level in September...