N-Q

As filed with the Securities and Exchange Commission on May 13, 2010

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number		811-00802
Mairs and Power Growth Fund, Inc.
(Exact name of registrant as specified in charter)
332 Minnesota Street, Suite W1520, St. Paul, MN			55101
(Address of principal executive offices)			(Zip code)
William B. Frels, President, 332 Minnesota Street, Suite W1520, St. Paul, MN 55101
(Name and address of agent for service)
Registrant’s telephone number, including area code:		651-222-8478
Date of fiscal year end:	December 31, 2010
Date of reporting period:	March 31, 2010

Item 1. Schedule of Investments.

SCHEDULE OF INVESTMENTS (unaudited) March 31, 2010

Shares	Security Description	Fair Value
	COMMON STOCKS 98.2%
	BASIC INDUSTRIES 15.0%
2,185,000	Bemis Co., Inc.	$	62,753,200
1,950,000	Ecolab Inc.	85,702,500
3,100,000	H.B. Fuller Co. (a)	71,951,000
2,830,000	Valspar Corp.	83,428,400
		303,835,100
	CAPITAL GOODS 13.7%
120,000	Badger Meter, Inc.	4,621,200
1,550,000	Donaldson Co., Inc.	69,936,000
380,000	Fastenal Co.	18,236,200
2,095,000	Graco Inc.	67,040,000
1,180,000	MTS Systems Corp. (a)	34,255,400
2,320,000	Pentair, Inc.	82,638,400
		276,727,200
	CONSUMER CYCLICAL 9.5%
500,000	G&K Services, Inc., Class A	12,940,000
1,650,000	Target Corp.	86,790,000
1,880,000	Toro Co. (a)	92,439,600
		192,169,600
	CONSUMER STAPLE 5.6%
780,000	General Mills, Inc.	55,216,200
1,200,000	Hormel Foods Corp.	50,412,000
480,000	SUPERVALU Inc.	8,006,400
		113,634,600
	DIVERSIFIED 7.3%
1,220,000	3M Co.	101,955,400
2,520,000	General Electric Co.	45,864,000
		147,819,400
	FINANCIAL 13.5%
1,260,000	Associated Banc-Corp.	17,388,000
250,000	Marshall & Ilsley Corp.	2,012,500
1,060,000	Principal Financial Group	30,962,600
3,210,000	TCF Financial Corp.	51,167,400
410,000	The Travelers Cos., Inc.	22,115,400
2,850,000	U.S. Bancorp	73,758,000
2,430,000	Wells Fargo & Co.	75,621,600
		273,025,500
	HEALTH CARE 19.8%
870,000	Baxter International Inc.	50,634,000
1,230,000	Johnson & Johnson	80,196,000
522,500	MEDTOX Scientific, Inc. (a)(b)	5,355,625
2,250,000	Medtronic, Inc.	101,317,500
900,000	Patterson Cos., Inc.	27,945,000
2,150,000	Pfizer Inc.	36,872,500
1,200,000	St. Jude Medical, Inc. (b)	49,260,000
800,000	SurModics, Inc. (b)	16,752,000
160,000	Techne Corp.	10,190,400
400,000	Zimmer Holdings, Inc. (b)	23,680,000
		402,203,025
	TECHNOLOGY 12.5%
1,030,000	ADC Telecommunications, Inc. (b)	7,529,300
1,860,000	Corning Inc.	37,590,600
1,170,000	Daktronics, Inc.	8,915,400
1,790,000	Emerson Electric Co.	90,108,600
160,000	Fiserv, Inc. (b)	8,121,600
1,600,000	Honeywell International Inc.	72,432,000
880,000	Intel Corp.	19,588,800

Shares	Security Description	Fair Value
	COMMON STOCKS (continued)
355,000	Stratasys, Inc. (b)	$	8,654,900
		252,941,200
	TRANSPORTATION 1.3%
130,000	C.H. Robinson Worldwide, Inc.	7,260,500
300,000	United Parcel Service, Inc., Class B	19,323,000
		26,583,500
	TOTAL COMMON STOCKS (Cost $1,463,749,288)	$	1,988,939,125
	SHORT-TERM INVESTMENTS 1.7%
12,727,832	FFI Premier Institutional Fund, 0.15% (c)	$	12,727,832
21,831,784	First American Prime Obligations Fund, Class Z, 0.05% (c)	21,831,784
	TOTAL SHORT-TERM INVESTMENTS (Cost $34,559,616)	$	34,559,616
	TOTAL INVESTMENTS 99.9% (Cost $1,498,308,904)	$	2,023,498,741
	OTHER ASSETS AND LIABILITIES (NET) 0.1%	2,517,890
	TOTAL NET ASSETS - 100.0%	$	2,026,016,631

(a)  Affiliated company.

(b)  Non-income producing.

(c)  The rate quoted is the annualized seven-day effective yield as of March 31, 2010.

See accompanying Notes to Schedule of Investments.

NOTES TO SCHEDULE OF INVESTMENTS (unaudited) March 31, 2010

Security Valuations

Security valuations for fund investments are furnished by independent pricing services that have been approved by the Fund’s Board of Directors (the Board). Investments in equity securities listed on an original exchange are stated at the last quoted sales price if readily available for such securities on each business day. Other equity securities traded in the over-the-counter market and listed equity securities for which no sale was reported on that date are stated at the last quoted bid price. Debt obligations with 60 days or less remaining until maturity may be valued at their amortized cost, which approximates fair value.

Securities for which prices are not available from an independent pricing service, but where an active market exists, are valued using market quotations obtained from one or more dealers that make markets in the securities or from a widely used quotation system. When market quotations are not readily available, or where the last quoted sale price is not considered representative of the value of the security if it were to be sold on that day, the security will be valued at fair value as determined in good faith by the Fair Valuation Committee appointed by the Board, pursuant to procedures approved by the Board. Factors that may be considered in determining the fair value of a security are fundamental analytical data relating to the security; the nature and duration of any restrictions on the disposition of the security; and the forces influencing the market in which the security is purchased or sold. As of March 31, 2010, no securities in the Fund were valued using this method.

In preparing this financial statement, the Fund has evaluated events and transactions for potential recognition or disclosure through the date the financial statement was issued.

Fair Valuation Measurements

The Fund has adopted authoritative fair valuation accounting standards which establish a definition of fair value and set out a hierarchy for measuring fair value.  These standards require additional disclosures about the various inputs and valuation techniques used to develop the measurements of fair value and changes in valuation techniques and related inputs during the period.  These inputs are summarized in the three broad levels listed below:

·Level 1 — Quoted prices in active markets for identical securities.

·Level 2 — Other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).

·Level 3 — Significant unobservable inputs (including the Fund’s own assumptions in determining the fair value of investments).

The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.  All of the inputs used to value the Fund’s net assets as of March 31, 2010 were classified as Level 1.  For detail of investments by major industry classification, please refer to the Schedule of Investments.

Security Transactions

Security transactions are recorded on the date on which securities are purchased or sold.

Income Taxes

At December 31, 2009, the cost of investments for federal income tax purposes was $1,540,415,396.  Net unrealized appreciation aggregated $393,526,275, of which $584,139,947 represented appreciated securities and $190,613,672 represented depreciated securities.

NOTES TO SCHEDULE OF INVESTMENTS (unaudited) (continued) March 31, 2010

Transactions With Affiliated Companies

The Fund owns 5% or more of the voting securities of the following companies as of March 31, 2010. As a result, these companies are deemed to be affiliates of the Fund as defined by the Investment Company Act of 1940. Transactions during the period in these securities of affiliated companies were as follows:

	Share Activity
Security Name	Balance12/31/2009	Purchases	Sales	Balance3/31/2010	DividendIncome		Value at3/31/2010
H.B. Fuller Co.	3,100,000	—	—	3,100,000	$	210,800	$	71,951,000
MEDTOX Scientific, Inc.	500,000	22,500	—	522,500	—		5,355,625
MTS Systems Corp.	1,180,000	—	—	1,180,000	177,000		34,255,400
Toro Co.	1,880,000	—	—	1,880,000	338,400		92,439,600
					$	726,200	$	204,001,625

Item 2. Controls and Procedures.

(a)  The registrant’s principal executive officer and principal financial officer have evaluated the registrant’s disclosure controls and procedures as of a date within 90 days of the filing date of this report and have concluded that the registrant’s disclosure controls and procedures were effective, as of that date, in ensuring that information required to be disclosed by the registrant in this Form N-Q was recorded, processed, summarized and reported within the time period specified by the SEC’s rules and forms.

(b) There was no change in the registrant’s internal control over financial reporting that occurred during the registrant’s last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 3. Exhibits.

Separate certifications for each principal executive officer and principal financial officer of the Registrant as required by Rule 30a-2(a) under the 1940 Act (17 CFR 270.30a-2(a)).  Filed herewith.

1

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant)		Mairs and Power Growth Fund, Inc.
By (Signature and Title)			/s/ William B. Frels
			William B. Frels, President
Date	May 13, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By (Signature and Title)*		/s/ William B. Frels
		William B. Frels, President
		(Principal Executive Officer)
Date	May 13, 2010
By (Signature and Title)*		/s/ Lisa J. Hartzell
		Lisa J. Hartzell, Treasurer
		(Principal Financial Officer)
Date	May 13, 2010

* Print the name and title of each signing officer under his or her signature.

2

EX-99.CERT

Exhibit 99.CERT

CERTIFICATION

I, William B. Frels, certify that:

1.I have reviewed this report on Form N-Q of Mairs and Power Growth Fund, 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 schedules of investments included in this report fairly present in all material respects the investments of the registrant as of the end of the fiscal quarter for which the report is filed;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) 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 a date within 90 days prior to the filing date of this report, based on such evaluation;

(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 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(s) and I have disclosed 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:	May 13, 2010	/s/ William B. Frels
		William B. Frels
		President

CERTIFICATION

I, Lisa J. Hartzell, certify that:

1.I have reviewed this report on Form N-Q of Mairs and Power Growth Fund, 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 schedules of investments included in this report fairly present in all material respects the investments of the registrant as of the end of the fiscal quarter for which the report is filed;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) 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 a date within 90 days prior to the filing date of this report, based on such evaluation;

(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 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(s) and I have disclosed 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:	May 13, 2010	/s/ Lisa J. Hartzell
		Lisa J. Hartzell
		Treasurer