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*KEN GRIFFIN SENDS INVESTOR LETTER ON SITUATIONAL AWARENESS:CNBC
*GRIFFIN: DONE NEARLY 100 BLOCK TRADES TOTALING OVER $4B: CNBC
*GRIFFIN: SHED OVER 80% OF RISK FROM ORIGINAL PORTFOLIO: CNBC
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*KEN GRIFFIN SENDS INVESTOR LETTER ON SITUATIONAL AWARENESS:CNBC
*GRIFFIN: DONE NEARLY 100 BLOCK TRADES TOTALING OVER $4B: CNBC
*GRIFFIN: SHED OVER 80% OF RISK FROM ORIGINAL PORTFOLIO: CNBC