"Sacca secretly secured commitments for up to $1 billion in 30 days from J.P. Morgan and municipal endowments. He and Rizvi spent it over the next 18 months, buying out former employees and other investors right up until the cap table closed in May 2013, before the IPO. When the positions became known, other investors were ticked off to see Sacca’s camp had accumulated the largest outside position in Twitter right under their noses."

Why did Chris do this in stealth? I would think that a company's investors would be pleased that another investor was bullish on their future.

Why were other investors ticked off, besides the subterfuge?

Thanks for learning me on pre-IPO secondary market trading etiquette!