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Viacom, Nvidia and Longfin Corp are the charts of the day

Let's check out the Yahoo Finance charts of the day.

Viacom (VIA) :Shares dropping here, down around -.8%. Reuters reports CBS will make an all-stock bid for Viacom below current valuation, meaning there could a long, tough road of merger negotiations ahead.

Nvidia (NVDA) :Shares pulling higher here, up around +2% B of A Merrill Lynch reiterated its buy rating and added the chipmaker to its US 1 top ideas list, citing upcoming gaming product launches later this year.

Longfin Corp. (LFIN) :Shares tumbling here in early trade, down -31%.  The blockchain tech firm revealed it is under SEC investigation for failing to disclose important information surrounding its recent IPO, and several misstatements the company has made since then.

For more on today's big stock movers check out the Final Round, live at 3:55 p.m. ET, right here on Yahoo Finance.