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COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS
> STST
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2010 | ARGON ST, Inc. | STST | 214,050 | 214,050 | 7,340,000 | 7,340,000 | $34.29 |
| 06/30/2009 | ARGON ST, Inc. | STST | 0 | -14,700 | 0 | -279,000 | |
| 03/31/2009 | ARGON ST, Inc. | STST | 14,700 | 14,700 | 279,000 | 279,000 | $18.98 |
| 12/31/2008 | ARGON ST, Inc. | STST | 0 | -10,000 | 0 | -235,000 | |
| 09/30/2008 | ARGON ST, Inc. | STST | 10,000 | 10,000 | 235,000 | 235,000 | $23.50 |
| 06/30/2008 | ARGON ST, Inc. | STST | 0 | -20,200 | 0 | -667,000 | |
| 06/30/2005 | ARGON ST, Inc. | STST | 0 | -20,200 | 0 | -667,000 | |
| 03/31/2005 | ARGON ST, Inc. | STST | 20,200 | 12,500 | 667,000 | 395,000 | $33.02 |
| 12/31/2004 | ARGON ST, Inc. | STST | 7,700 | 7,700 | 272,000 | 272,000 | $35.32 |
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