Annual Report — Form 10-K
Filing Table of Contents
Document/Exhibit Description Pages Size
1: 10-K Mdu Resources Group, Inc. 2004 10-K 156± 674K
2: EX-12 Computation of Ratio of Earnings 2± 9K
3: EX-21 Subsidiaries of Mdu Resources Group, Inc. 2± 11K
4: EX-23 Independent Auditors' Consent 1 8K
5: EX-31.A Section 302 Certification of CEO 2± 11K
6: EX-31.B Section 302 Certification of CFO 2± 11K
7: EX-32 Section 906 Certifications of CEO and CFO 1 7K
EX-31.A — Section 302 Certification of CEO
CERTIFICATION
I, Martin A. White, certify that:
1. I have reviewed this annual report on Form 10-K of
MDU Resources Group, Inc.;
2. Based on my knowledge, this report does not contain any
untrue statement of a material fact or omit to state a
material fact necessary to make the statements made, in
light of the circumstances under which such statements
were made, not misleading with respect to the period
covered by this report;
3. Based on my knowledge, the financial statements, and
other financial information included in this report,
fairly present in all material respects the financial
condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in
this report;
4. The registrant's other certifying officer and I are
responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act
Rules 13a-15(e) and 15d-15(e)) and internal control
over financial reporting (as defined in Exchange Act
Rules 13a-15(f) and 15d-15(f)) for the registrant and
have:
(a) Designed such disclosure controls and
procedures, or caused such disclosure controls and
procedures to be designed under our supervision, to
ensure that material information relating to the
registrant, including its consolidated subsidiaries,
is made known to us by others within those entities,
particularly during the period in which this report
is being prepared;
(b) Designed such internal control over financial
reporting, or caused such internal control over
financial reporting to be designed under our
supervision, to provide reasonable assurance
regarding the reliability of financial reporting and
the preparation of financial statements for external
purposes in accordance with generally accepted
accounting principles;
(c) Evaluated the effectiveness of the registrant's
disclosure controls and procedures and presented in
this report our conclusions about the effectiveness
of the disclosure controls and procedures, as of the
end of the period covered by this report based on
such evaluation; and
(d) Disclosed in this report any change in the
registrant's internal control over financial
reporting that occurred during the registrant's most
recent fiscal quarter (the registrant's fourth
fiscal quarter in the case of an annual report) that
has materially affected, or is reasonably likely to
materially affect, the registrant's internal control
over financial reporting; and
5. The registrant's other certifying officer and I have
disclosed, based on our most recent evaluation of
internal control over financial reporting, to the
registrant's auditors and the audit committee of the
registrant's board of directors (or persons performing
the equivalent functions):
(a) All significant deficiencies and material
weaknesses in the design or operation of internal
control over financial reporting which are
reasonably likely to adversely affect the
registrant's ability to record, process, summarize
and report financial information; and
(b) Any fraud, whether or not material, that
involves management or other employees who have a
significant role in the registrant's internal
control over financial reporting.
Date: February 23, 2005
/s/ Martin A. White
Martin A. White
Chairman of the Board, President
and Chief Executive Officer
Dates Referenced Herein and Documents Incorporated by Reference
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