Exhibit 99.1

MARTEN TRANSPORT ANNOUNCES SECOND QUARTER RESULTS

MONDOVI, Wis., July 14, 2015 (GLOBE NEWSWIRE) -- Marten Transport, Ltd. (Nasdaq/GS:MRTN) today reported a 5.4% increase in net income to $8.4 million, or 25 cents per diluted share, for the second quarter ended June 30, 2015, from $7.9 million, or 24 cents per diluted share, for the second quarter of 2014. For the six-month period ended June 30, 2015, net income increased 40.4% to $18.5 million, or 55 cents per diluted share, compared with $13.2 million, or 39 cents per diluted share, for the first six months of 2014. As previously reported, results for the first six months of 2015 included a gain on the disposition of a facility of $3.7 million, or 6 cents per diluted share, which occurred as part of the Company’s ongoing program to expand and update the footprint of its facilities throughout the United States.

Operating revenue, net of fuel surcharges, improved 6.1% to $143.9 million for the second quarter of 2015 from $135.7 million for the second quarter of 2014, and improved 8.1% to $284.6 million for the first six months of 2015 from $263.2 million for the first six months of 2014. These improvements were primarily due to the continued growth of Marten’s dedicated operations. Operating revenue was $163.6 million for the 2015 quarter compared with $168.4 million for the 2014 quarter, and was $324.9 million for the 2015 six-month period compared with $327.8 million for the 2014 six-month period. Fuel surcharge revenue decreased to $19.7 million for the second quarter of 2015 from $32.7 million for the 2014 quarter, and decreased to $40.2 million for the 2015 six-month period from $64.6 million for the 2014 six-month period.

Operating expenses as a percentage of operating revenue, with both amounts net of fuel surcharges, improved to 90.2% for the second quarter of 2015 from 90.5% for the second quarter of 2014. The ratio improved to 88.9% for the 2015 six-month period from 91.8% for the 2014 six-month period. The operating ratio, net of both fuel surcharges and the gain on the facility disposition, improved to 90.2% for the six-month period ended June 30, 2015.

Chairman and Chief Executive Officer Randolph L. Marten said, “We are encouraged by our continued growth in both our profitability and tractor fleet size, with our average truckload and dedicated tractor count up 201 tractors, or 9.2%, over last year’s second quarter. Looking forward to the third quarter and beyond, we secured multi-year dedicated contracts for an additional 279 tractors in this year’s second quarter. We believe the demand for our customized dedicated transportation solutions will continue to result in further growth and remain confident about our position to capitalize on growth opportunities across all of our business units.”

Marten Transport, with headquarters in Mondovi, Wis., is one of the leading temperature-sensitive truckload carriers in the United States. Marten specializes in transporting and distributing food and other consumer packaged goods that require a temperature-controlled or insulated environment. Marten offers service in the United States, Canada and Mexico, concentrating on expedited movements for high-volume customers. Marten’s common stock is traded on the Nasdaq Global Select Market under the symbol MRTN.

Beginning with the fourth quarter of 2014, Marten Transport moved from two to four financial reporting segments. Marten now reports its operating results in Truckload, Dedicated, Intermodal and Brokerage segments instead of the previously reported Truckload and Logistics segments. The reporting of prior periods has been updated to reflect this change.

This press release contains certain statements that may be considered forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These statements by their nature involve substantial risks and uncertainties, and actual results may differ materially from those expressed in such forward-looking statements. Important factors known to the Company that could cause actual results to differ materially from those discussed in the forward-looking statements are discussed in Item 1A of the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. The Company undertakes no obligation to correct or update any forward-looking statements, whether as a result of new information, future events or otherwise.

CONTACTS: Tim Kohl, President, and Jim Hinnendael, Executive Vice President and Chief Financial Officer, of Marten Transport, Ltd., 715-926-4216.

MARTEN TRANSPORT, LTD.

CONSOLIDATED CONDENSED BALANCE SHEETS

(Unaudited)

	June 30,			December 31,
(In thousands, except share information)	2015			2014
ASSETS
Current assets:
Cash and cash equivalents	$	4,499		$	123
Receivables:
Trade, net		68,898			72,263
Other		8,814			17,740
Prepaid expenses and other		15,912			16,860
Deferred income taxes		3,091			3,199
Total current assets		101,214			110,185
Property and equipment:
Revenue equipment, buildings and land, office equipment and other		700,123			645,972
Accumulated depreciation		(190,330	)		(180,223	)
Net property and equipment		509,793			465,749
Other assets		3,606			3,726
Total assets	$	614,613		$	579,660
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Checks issued in excess of cash balances	$	-		$	745
Accounts payable and accrued liabilities		65,221			29,775
Insurance and claims accruals		13,645			13,998
Total current liabilities		78,866			44,518
Long-term debt		-			24,373
Deferred income taxes		127,347			122,843
Total liabilities		206,213			191,734
Stockholders’ equity:
Preferred stock, $.01 par value per share; 2,000,000 shares authorized; no shares issued and outstanding		-			-
Common stock, $.01 par value per share; 96,000,000 shares authorized; 33,618,595 shares at June 30, 2015, and 33,418,829 shares at December 31, 2014, issued and outstanding		336			334
Additional paid-in capital		90,975			87,370
Retained earnings		317,089			300,222
Total stockholders’ equity		408,400			387,926
Total liabilities and stockholders’ equity	$	614,613		$	579,660

MARTEN TRANSPORT, LTD.

CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS

(Unaudited)

	Three Months							Six Months
	Ended June 30,							Ended June 30,
(In thousands, except per share information)	2015			2014			2015			2014
Operating revenue	$	163,588		$	168,423		$	324,875		$	327,832
Operating expenses (income):
Salaries, wages and benefits		50,964			44,667			99,772			88,399
Purchased transportation		28,083			30,739			57,587			58,869
Fuel and fuel taxes		28,281			40,494			54,757			80,320
Supplies and maintenance		10,942			10,351			21,384			20,786
Depreciation		18,311			16,865			36,138			33,236
Operating taxes and licenses		2,014			1,728			3,890			3,441
Insurance and claims		6,778			6,663			14,868			12,788
Communications and utilities		1,388			1,311			2,916			2,744
Gain on disposition of revenue equipment		(1,787	)		(1,278	)		(2,948	)		(1,941	)
Gain on disposition of facility		-			-			(3,712	)		-
Other		4,453			3,951			8,751			7,618
Total operating expenses		149,427			155,491			293,403			306,260
Operating income		14,161			12,932			31,472			21,572
Other		6			(612	)		21			(710	)
Income before income taxes		14,155			13,544			31,451			22,282
Provision for income taxes		5,798			5,618			12,906			9,069
Net income	$	8,357		$	7,926		$	18,545		$	13,213
Basic earnings per common share	$	0.25		$	0.24		$	0.55		$	0.40
Diluted earnings per common share	$	0.25		$	0.24		$	0.55		$	0.39
Dividends declared per common share	$	0.025		$	0.025		$	0.050		$	0.050

MARTEN TRANSPORT, LTD.

SEGMENT INFORMATION

(Unaudited)

							Dollar			Percentage
							Change			Change
	Three Months						Three Months			Three Months
	Ended						Ended			Ended
	June 30,						June 30,			June 30,
(Dollars in thousands)	2015			2014			2015 vs. 2014			2015 vs. 2014
Operating revenue:
Truckload revenue, net of fuel surcharge revenue	$	88,822		$	90,316		$	(1,494	)		(1.7	)%
Truckload fuel surcharge revenue		13,929			23,699			(9,770	)		(41.2	)
Total Truckload revenue		102,751			114,015			(11,264	)		(9.9	)
Dedicated revenue, net of fuel surcharge revenue		22,601			11,845			10,756			90.8
Dedicated fuel surcharge revenue		2,803			3,245			(442	)		(13.6	)
Total Dedicated revenue		25,404			15,090			10,314			68.3
Intermodal revenue, net of fuel surcharge revenue		16,101			20,406			(4,305	)		(21.1	)
Intermodal fuel surcharge revenue		2,945			5,800			(2,855	)		(49.2	)
Total Intermodal revenue		19,046			26,206			(7,160	)		(27.3	)
Brokerage revenue		16,387			13,112			3,275			25.0
Total operating revenue	$	163,588		$	168,423		$	(4,835	)		(2.9	)%
Operating income:
Truckload	$	9,808		$	10,410		$	(602	)		(5.8	)%
Dedicated		2,563			1,433			1,130			78.9
Intermodal		969			483			486			100.6
Brokerage		821			606			215			35.5
Total operating income	$	14,161		$	12,932		$	1,229			9.5	%
Operating ratio:
Truckload		90.5	%		90.9	%
Dedicated		89.9			90.5
Intermodal		94.9			98.2
Brokerage		95.0			95.4
Consolidated operating ratio		91.3	%		92.3	%

MARTEN TRANSPORT, LTD.

SEGMENT INFORMATION

(Unaudited)

							Dollar			Percentage
							Change			Change
	Six Months						Six Months			Six Months
	Ended						Ended			Ended
	June 30,						June 30,			June 30,
(Dollars in thousands)	2015			2014			2015 vs. 2014			2015 vs. 2014
Operating revenue:
Truckload revenue, net of fuel surcharge revenue	$	175,633		$	177,118		$	(1,485	)		(0.8	)%
Truckload fuel surcharge revenue		28,519			47,411			(18,892	)		(39.8	)
Total Truckload revenue		204,152			224,529			(20,377	)		(9.1	)
Dedicated revenue, net of fuel surcharge revenue		42,464			22,573			19,891			88.1
Dedicated fuel surcharge revenue		5,394			6,067			(673	)		(11.1	)
Total Dedicated revenue		47,858			28,640			19,218			67.1
Intermodal revenue, net of fuel surcharge revenue		33,120			38,760			(5,640	)		(14.6	)
Intermodal fuel surcharge revenue		6,318			11,136			(4,818	)		(43.3	)
Total Intermodal revenue		39,438			49,896			(10,458	)		(21.0	)
Brokerage revenue		33,427			24,767			8,660			35.0
Total operating revenue	$	324,875		$	327,832		$	(2,957	)		(0.9	)%
Operating income:
Truckload	$	19,410		$	16,588		$	2,822			17.0	%
Dedicated		4,567			2,755			1,812			65.8
Intermodal		2,220			966			1,254			129.8
Brokerage		1,563			1,263			300			23.8
Total operating income before gain on disposition of facility		27,760			21,572			6,188			28.7
Gain on disposition of facility		3,712			-			3,712		N/A
Total operating income	$	31,472		$	21,572		$	9,900			45.9	%
Operating ratio:
Truckload		90.5	%		92.6	%
Dedicated		90.5			90.4
Intermodal		94.4			98.1
Brokerage		95.3			94.9
Consolidated operating ratio before gain on disposition of facility		91.5	%		93.4	%
Consolidated operating ratio		90.3	%		93.4	%

MARTEN TRANSPORT, LTD.

OPERATING STATISTICS

(Unaudited)

	Three Months						Six Months
	Ended June 30,						Ended June 30,
	2015			2014			2015			2014
Truckload Segment:
Revenue (in thousands)	$	102,751		$	114,015		$	204,152		$	224,529
Average revenue, net of fuel surcharges, per tractor per week(1)	$	3,623		$	3,655		$	3,615		$	3,581
Average tractors(1)		1,886			1,901			1,879			1,913
Average miles per trip		679			676			692			679
Non-revenue miles percentage(2)		9.5	%		9.9	%		9.4	%		9.6	%
Total miles (in thousands)		47,829			50,589			95,359			100,092
Dedicated Segment:
Revenue (in thousands)	$	25,404		$	15,090		$	47,858		$	28,640
Average revenue, net of fuel surcharges, per tractor per week(1)	$	3,493		$	3,234		$	3,469		$	3,332
Average tractors(1)		498			282			473			262
Average miles per trip		368			335			371			336
Non-revenue miles percentage(2)		1.4	%		1.7	%		1.9	%		1.5	%
Total miles (in thousands)		12,274			6,608			23,349			12,524
Intermodal Segment:
Revenue (in thousands)	$	19,046		$	26,206		$	39,438		$	49,896
Loads		8,867			12,032			18,234			22,555
Average tractors		91			121			94			110
Brokerage Segment:
Revenue (in thousands)	$	16,387		$	13,112		$	33,427		$	24,767
Loads		10,774			8,611			21,624			16,319
At June 30, 2015 and June 30, 2014:
Total tractors(1)		2,605			2,311
Average age of company tractors (in years)		1.6			1.8
Total trailers		4,397			4,225
Average age of company trailers (in years)		2.6			2.5
Ratio of trailers to tractors(1)		1.7			1.8

	Three Months				Six Months
	Ended June 30,				Ended June 30,
(In thousands)	2015		2014		2015		2014
Net cash provided by operating activities	$	18,614	$	13,187	$	71,776	$	40,695
Net cash used for investing activities		36,573		48,149		43,335		69,533
Weighted average shares outstanding:
Basic		33,582		33,369		33,521		33,355
Diluted		33,853		33,696		33,802		33,662

(1)	Includes tractors driven by both company-employed drivers and independent contractors. Independent contractors provided 58 and 35 tractors as of June 30, 2015, and 2014, respectively.
(2)	Represents the percentage of miles for which the company is not compensated.