Integral Ad Science, which helps keep digital ads non-fraudulent and "brand safe", closes up 14% in its debut after its IPO, valuing the company at ~$3.3B (Megan Graham/CNBC)

Megan Graham / CNBC: Integral Ad Science, which helps keep digital ads non-fraudulent and “brand safe”, closes up 14% in its debut after its IPO, valuing the company at ~$3.3B  —  - Ad tech company Integral Ad Science began trading on Wednesday under the ticker “IAS.”  — IAS pegs itself as a “verification company” for digital ads.
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