DAWSON GEOPHYSICAL CO filings

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SEC filings by DAWSON GEOPHYSICAL CO (ownership)
TypeFiledFilerSubjectShares OwnedPercent Owned
SC 13G/A2002-02-14QUAKER CAPITAL MANAGEMENT CORPDAWSON GEOPHYSICAL CO528,4239.7%EDGAR
SC 13G/A2002-02-12WELLINGTON MANAGEMENT CO LLPDAWSON GEOPHYSICAL CO539,0009.9%EDGAR
SC 13G/A2002-02-12DIMENSIONAL FUND ADVISORS INCDAWSON GEOPHYSICAL CO338,4006.2%EDGAR
SC 13G2002-02-11WELLINGTON TRUST COMPANY N ADAWSON GEOPHYSICAL CO374,0006.9%EDGAR
SC 13G/A2001-11-13FMR CORPDAWSON GEOPHYSICAL CO00.0%EDGAR
SC 13G/A2001-02-14QUAKER CAPITAL MANAGEMENT CORPDAWSON GEOPHYSICAL CO360,8236.6%EDGAR
SC 13G/A2001-02-13FMR CORPDAWSON GEOPHYSICAL CO277,9005.1%EDGAR
SC 13G/A2001-02-13WELLINGTON MANAGEMENT CO LLPDAWSON GEOPHYSICAL CO475,0008.8%EDGAR
SC 13G2001-02-02DIMENSIONAL FUND ADVISORS INCDAWSON GEOPHYSICAL CO338,2006.2%EDGAR
SC 13G/A2001-01-10AMVESCAP PLC \GA\DAWSON GEOPHYSICAL CO00.0%EDGAR
SC 13D/A2000-11-15- ---EDGAR
SC 13G/A2000-02-14QUAKER CAPITAL MANAGEMENT CORPDAWSON GEOPHYSICAL CO358,7006.6%EDGAR
SC 13G/A2000-02-14QUAKER CAPITAL MANAGEMENT CORPDAWSON GEOPHYSICAL CO358,7006.6%EDGAR
SC 13G/A2000-02-14QUAKER CAPITAL MANAGEMENT CORPDAWSON GEOPHYSICAL CO358,7006.6%EDGAR
SC 13G/A2000-02-11WELLINGTON MANAGEMENT CO LLPDAWSON GEOPHYSICAL CO355,0006.6%EDGAR
SC 13G2000-02-11FMR CORPDAWSON GEOPHYSICAL CO357,9006.6%EDGAR
SC 13G/A2000-02-11WELLINGTON MANAGEMENT CO LLPDAWSON GEOPHYSICAL CO355,0006.6%EDGAR
SC 13G2000-02-11FMR CORPDAWSON GEOPHYSICAL CO357,9006.6%EDGAR
SC 13G/A2000-02-11WELLINGTON MANAGEMENT CO LLPDAWSON GEOPHYSICAL CO355,0006.6%EDGAR
SC 13G2000-02-11FMR CORPDAWSON GEOPHYSICAL CO357,9006.6%EDGAR
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