#letter_security  a stock or bond that is not registered with the Securities Exchange Commission and cannot be sold in the public market
  supertype:  certificate__security  a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends; "he held several valuable securities"
  subtype:  letter_stock  stock that has not been registered with the Securities and Exchange Commission and cannot be sold to the general public
  subtype:  letter_bond  a bond that has not been registered with the Securities and Exchange Commission and cannot be sold to the general public

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