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Re:A growing number of traders are betting Snap’s stock pric... by gifsawww on Thursday June 08, 2017 @10:38AM (#14514466)
As a native English speaker I disagree with this pedantry. It's correctly plural.

Dictionary.com says: Usage note 2. As a collective noun, number, when preceded by a, is most often treated as a plural: A number of legislators have voiced their dissent. When preceded by the, it is usually used as a singular: The number of legislators present was small.

Re:A growing number of traders are betting Snap’s stock pric... by semi-extrinsic on Thursday June 08, 2017 @10:53AM (#14514579)
I find it helpful in cases like this, when in doubt, to replace the phrase in question with a single word and see what makes sense then. Here:

"a growing number of traders" => "they", so "are" is correct.

"the growing number of traders" => "it", so "is" is correct.