So from what I can figure, the buy on Friday of over >200t...

• So from what I can figure, the buy on Friday of over >200t shares without appearing on the buy side, then appearing on the sold side is a direct manipulation of the market, to acquire a larger parcel of shares without increasing the price. This can only be done on Dark Pool trading (?), meaning it's broker controlled. If you look at the weekly trading history it happens fairly frequently at around 11am-12 nearly every day. It's actually just stopping the price from rising through published demand. Therefore you could assume that someone is acquiring and someone selling on a regular and preprogrammed basis. I've listed the Dark Pool operators from Wikipedia but these are US I assume. JP Morgan & GS are Dark Pool traders.
• Broker-dealer-owned dark pools
  
  • JPMorgan Chase Bank - JPMX
  • Barclays Capital - LX Liquidity Cross
  • BNP Paribas - BNP Paribas Internal eXchange (BIX)
  • BNY ConvergEx Group (an affiliate of Bank of New York Mellon)
  • Cantor Fitzgerald - Aqua Securities
  • Citi - Citi Match, Citi Cross
  • Credit Agricole Cheuvreux - BLINK
  • Credit Suisse - CrossFinder
  • Deutsche Bank Global Markets - DBA (Europe), SuperX ATS (U.S.)
  • Fidelity Capital Markets
  • GETCO - GETMatched
  • Goldman Sachs SIGMA X
  • Knight Capital Group - Knight Link, Knight Match
  • Merrill Lynch - Instinct-X
  • Morgan Stanley - NightVision
  • Nomura - Nomura NX
  • UBS Investment Bank - UBS ATS, UBS MTF, UBS PIN
  • Societe Generale - ALPHA Y
  • Daiwa - DRECT
  • Wells Fargo Securities LLC - WELX - has since closed
  Consortium-owned dark pools[edit]
  
  • BIDS Trading - BIDS ATS
  • LeveL ATS
  Exchange-owned dark pools[edit]
  
  • International Securities Exchange
  • NYSE Euronext
  • BATS Trading
  • Turquoise
  • Swiss Block^{[citation needed]}
  • Nordic@Mid^{[citation needed]}
  Other dark pools[edit]
  
  • Chi-X
  • IEX
  Dark pool aggregators[edit]
  
  • Fidessa - Spotlight
  • Bloomberg Tradebook
  • Liquidnet LN Dark
  • Credit Suisse Crossfinder Plus
  • SuperX+ – Deutsche Bank
  • ASOR – Quod Financial
  • Progress Apama
  • ONEPIPE – Weeden & Co. & Pragma Financial
  • Xasax Corporation
  • Crossfire – Credit Agricole Cheuvreux
  • Instinet - Nighthawk