The Federal Reserve is currently reducing the amount of asset purchases at a measured pace, while the BOJ continues to purchase assets based at a pre-determined annual pace (a pace currently clarified until the end of 2014). The BOE is maintaining its outstanding asset holding amounts.
Meanwhile, the ECB has taken a different approach by purchasing a limited amount of financial assets and sterilizing the amount of sovereign bonds purchased under its securities market program (SMP). In June 2014, the commitment to sterilizing those bonds purchased was suspended because inflationary concerns had dissipated.