| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13D/A | 2004-06-09 | NIERENBERG DAVID | NATUS MEDICAL INC | 1,305,157 | 7.8% | EDGAR |
| SC 13G/A | 2004-04-12 | FEDERATED INVESTORS INC /PA/ | NATUS MEDICAL INC | 0 | 0.0% | EDGAR |
| SC 13D/A | 2004-03-12 | PERRY CORP | NATUS MEDICAL INC | 3,987,940 | 24.2% | EDGAR |
| SC 13D/A | 2004-03-05 | PERRY CORP | NATUS MEDICAL INC | 3,988,040 | 24.2% | EDGAR |
| SC 13G/A | 2004-02-13 | FEDERATED INVESTORS INC /PA/ | NATUS MEDICAL INC | 1,919,600 | 11.6% | EDGAR |
| SC 13G/A | 2004-02-12 | BAUPOST GROUP LLC/MA | NATUS MEDICAL INC | 997,500 | 6.0% | EDGAR |
| SC 13G/A | 2004-02-06 | NEW WILLIAM JR MD PHD | NATUS MEDICAL INC | 1,045,034 | 6.3% | EDGAR |
| SC 13D/A | 2003-03-14 | PERRY CORP | NATUS MEDICAL INC | 4,648,400 | 28.5% | EDGAR |
| SC 13D | 2003-02-14 | NIERENBERG DAVID | NATUS MEDICAL INC | 997,999 | 6.1% | EDGAR |
| SC 13G/A | 2003-02-14 | DELPHI VENTURES LP | NATUS MEDICAL INC | 0 | 0.0% | EDGAR |
| SC 13G/A | 2003-02-14 | FEDERATED INVESTORS INC /PA/ | NATUS MEDICAL INC | 1,935,300 | 12.0% | EDGAR |
| SC 13G | 2003-02-13 | BAUPOST GROUP LLC/MA | NATUS MEDICAL INC | 834,000 | 5.2% | EDGAR |
| SC 13G/A | 2003-02-10 | NEW WILLIAM JR MD PHD | NATUS MEDICAL INC | 1,034,201 | 6.4% | EDGAR |
| SC 13G/A | 2003-01-15 | TRINITY VENTURES LP | NATUS MEDICAL INC | - | 0.0% | EDGAR |
| SC 13D/A | 2002-08-30 | PERRY CORP | NATUS MEDICAL INC | 4,348,400 | 27.0% | EDGAR |
| SC 13D/A | 2002-08-29 | PERRY CORP | NATUS MEDICAL INC | 4,348,400 | 27.0% | EDGAR |
| SC 13D | 2002-08-23 | PERRY CORP | NATUS MEDICAL INC | 4,348,000 | 27.0% | EDGAR |
| SC 13D | 2002-03-08 | NIERENBERG DAVID | NATUS MEDICAL INC | 929,968 | 5.9% | EDGAR |
| SC 13G/A | 2002-02-14 | PANTHEON INTERNATIONAL PARTICIPATIONS PLC | NATUS MEDICAL INC | 777,381 | 4.9% | EDGAR |
| SC 13G | 2002-02-14 | PANTHEON INTERNATIONAL PARTICIPATIONS PLC | NATUS MEDICAL INC | 952,381 | 6.0% | EDGAR |