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BlackRock Institutional Trust Company, N.A.
> PPCO
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2010 | PENWEST PHARMACEUTICALS CO | PPCO | 827,253 | 142,382 | 2,730,000 | 367,000 | $3.30 |
| 03/31/2010 | PENWEST PHARMACEUTICALS CO | PPCO | 684,871 | -28,644 | 2,363,000 | 515,000 | $3.45 |
| 12/31/2009 | PENWEST PHARMACEUTICALS CO | PPCO | 713,515 | -213,047 | 1,848,000 | -7,491,000 | $2.59 |
| 09/30/2009 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -926,562 | 0 | -9,339,000 | |
| 06/30/2009 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -926,562 | 0 | -9,339,000 | |
| 03/31/2009 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -926,562 | 0 | -9,339,000 | |
| 12/31/2008 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -926,562 | 0 | -9,339,000 | |
| 09/30/2008 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -926,562 | 0 | -9,339,000 | |
| 06/30/2008 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -926,562 | 0 | -9,339,000 | |
| 03/31/2008 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -926,562 | 0 | -9,339,000 | |
| 12/31/2007 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -926,562 | 0 | -9,339,000 | |
| 09/30/2007 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -926,562 | 0 | -9,339,000 | |
| 06/30/2007 | PENWEST PHARMACEUTICALS CO | PPCO | 924,673 | -1,889 | 11,530,000 | 2,191,000 | $12.47 |
| 03/31/2007 | PENWEST PHARMACEUTICALS CO | PPCO | 926,562 | 499,306 | 9,339,000 | -1,073,000 | $10.08 |
| 12/31/2006 | PENWEST PHARMACEUTICALS CO | PPCO | 1,038,633 | 611,377 | 17,261,000 | 6,849,000 | $16.62 |
| 09/30/2006 | PENWEST PHARMACEUTICALS CO | PPCO | 981,202 | 553,946 | 16,336,000 | 5,924,000 | $16.65 |
| 06/30/2006 | PENWEST PHARMACEUTICALS CO | PPCO | 952,176 | 524,920 | 20,785,000 | 10,373,000 | $21.83 |
| 03/31/2006 | PENWEST PHARMACEUTICALS CO | PPCO | 973,113 | 545,857 | 21,106,000 | 10,694,000 | $21.69 |
| 12/31/2005 | PENWEST PHARMACEUTICALS CO | PPCO | 910,700 | 483,444 | 17,776,000 | 7,364,000 | $19.52 |
| 09/30/2005 | PENWEST PHARMACEUTICALS CO | PPCO | 897,831 | 470,575 | 15,738,000 | 5,326,000 | $17.53 |
| 06/30/2005 | PENWEST PHARMACEUTICALS CO | PPCO | 786,582 | 359,326 | 9,296,000 | -1,116,000 | $11.82 |
| 03/31/2005 | PENWEST PHARMACEUTICALS CO | PPCO | 921,713 | 494,457 | 11,390,000 | 978,000 | $12.36 |
| 12/31/2004 | PENWEST PHARMACEUTICALS CO | PPCO | 1,105,610 | 1,105,610 | 13,222,000 | 13,222,000 | $11.96 |
| 09/30/2004 | PENWEST PHARMACEUTICALS CO | PPCO | 1,059,111 | 631,855 | 11,906,000 | 1,494,000 | $11.24 |
| 06/30/2004 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -621,592 | 0 | -9,339,000 | |
| 03/31/2004 | PENWEST PHARMACEUTICALS CO | PPCO | 621,592 | 194,336 | 9,339,000 | -1,073,000 | $15.02 |
| 12/31/2003 | PENWEST PHARMACEUTICALS CO | PPCO | 932,370 | 505,114 | 16,100,000 | 5,688,000 | $17.27 |
| 09/30/2003 | PENWEST PHARMACEUTICALS CO | PPCO | 597,184 | 169,928 | 12,984,000 | 2,572,000 | $21.74 |
| 06/30/2003 | PENWEST PHARMACEUTICALS CO | PPCO | 427,256 | 427,256 | 10,412,000 | 10,412,000 | $24.37 |
| 03/31/2003 | PENWEST PHARMACEUTICALS CO | PPCO | 0 | -430,385 | 0 | -4,561,000 | |
| 12/31/2002 | PENWEST PHARMACEUTICALS CO | PPCO | 430,385 | 34,422 | 4,561,000 | 1,264,000 | $10.60 |
| 09/30/2002 | PENWEST PHARMACEUTICALS CO | PPCO | 395,963 | 44,228 | 3,297,000 | -3,560,000 | $8.33 |
| 06/28/2002 | PENWEST PHARMACEUTICALS CO | PPCO | 351,735 | 2,149 | 6,857,000 | 76,000 | $19.49 |
| 03/28/2002 | PENWEST PHARMACEUTICALS CO | PPCO | 349,586 | 33,170 | 6,781,000 | 438,000 | $19.40 |
| 12/31/2001 | PENWEST PHARMACEUTICALS CO | PPCO | 316,416 | 30,258 | 6,343,000 | 1,414,000 | $20.05 |
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