Impax Asset Management 13F-HR Quarterly holdings report by institutional manager

The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE

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COLUMN 1	COLUMN 2	COLUMN 3	COLUMN 4	COLUMN 5			COLUMN 6	COLUMN 7	COLUMN 8
			VALUE	SHRS OR	SH/	PUT/	INVESTMENT	OTHER	VOTING AUTHORITY
NAME OF ISSUER	TITLE OF CLASS	CUSIP	(x$1000)	PRN AMT	PRN	CALL	DISCRETION	MANAGER	SOLE	SHARED	NONE
3M Co.	COM	88579Y101	29,224	189,397	SH		SOLE		189,397	0	0
ACI Worldwide, Inc.	COM	004498101	16,533	672,886	SH		SOLE		672,886	0	0
ARRIS Group, Inc.	COM	04270v106	13,840	452,278	SH		SOLE		452,278	0	0
AT&T, Inc.	COM	00206R102	14,380	404,829	SH		DFND	1	404,829	0	0
AbbVie, Inc.	COM	00287Y109	16,817	250,286	SH		SOLE		250,286	0	0
Abbott Laboratories	COM	002824100	6,202	126,367	SH		DFND	1	126,367	0	0
Accenture PLC, Class A	SHS CLASS A	G1151C101	290	2,992	SH		SOLE	1	2,992	0	0
Aetna, Inc.	COM	00817Y108	1,793	14,071	SH		SOLE	1	14,071	0	0
Agilent Technologies, Inc.	COM	00846U101	2,442	63,306	SH		SOLE		63,306	0	0
Air Lease Corp.	CL A	00912X302	968	28,569	SH		SOLE		28,569	0	0
Alexion Pharmaceuticals, Inc.	COM	015351109	1,521	8,415	SH		SOLE		8,415	0	0
Amazon.com, Inc.	COM	023135106	15,307	35,262	SH		SOLE		35,262	0	0
Amdocs, Ltd.	SHS	G02602103	23,052	422,267	SH		SOLE		422,267	0	0
American Express Co.	COM	025816109	2,077	26,730	SH		SOLE		26,730	0	0
American Tower Corp., REIT	COM	03027X100	38,127	408,698	SH		DFND	1	408,698	0	0
American Water Works Co., Inc.	COM	030420103	2,676	55,036	SH		DFND	1	55,036	0	0
Apache Corp.	COM	037411105	15,611	270,877	SH		SOLE		270,877	0	0
Apple, Inc.	COM	037833100	73,849	588,791	SH		SOLE		588,791	0	0
Axiall Corp.	COM	05463D100	14,635	405,952	SH		SOLE		405,952	0	0
Bank of New York Mellon Corp.,	COM	064058100	26,113	622,179	SH		SOLE		622,179	0	0
Becton Dickinson & Co.	COM	075887109	49,514	349,554	SH		DFND	1	349,554	0	0
Berkshire Hathaway, Inc., Clas	CL B NEW	084670702	990	7,276	SH		SOLE	1	7,276	0	0
Berkshire Hills Bancorp Inc	COM	084680107	6,795	238,592	SH		SOLE		238,592	0	0
Biogen, Inc.	COM	09062X103	2,571	6,364	SH		DFND	1	6,364	0	0
BlackRock, Inc.	COM	09247X101	38,977	112,658	SH		SOLE		112,658	0	0
BorgWarner, Inc.	COM	099724106	10,954	192,718	SH		SOLE		192,718	0	0
Bristol-Myers Squibb Co.	COM	110122108	3,582	53,835	SH		DFND	1	53,835	0	0
Brookdale Senior Living, Inc.	COM	112463104	22,029	634,828	SH		SOLE		634,828	0	0
CBRE Group, Inc., Class A	CL A	12504L109	2,883	77,931	SH		SOLE		77,931	0	0
Cabela's, Inc.	COM	126804301	18,247	365,091	SH		SOLE		365,091	0	0
Campbell Soup Co.	COM	134429109	457	9,600	SH		SOLE	1	9,600	0	0
Cantel Medical Corp.	COM	138098108	8,967	167,074	SH		SOLE		167,074	0	0
Cape Bancorp, Inc.	COM	139209100	1,271	134,303	SH		SOLE		134,303	0	0
Capitol Federal Financial, Inc	COM	14057j101	23,060	1,915,263	SH		SOLE		1,915,263	0	0
Carter's, Inc.	COM	146229109	17,646	166,006	SH		SOLE		166,006	0	0
Celgene Corp.	COM	151020104	26,187	226,271	SH		SOLE		226,271	0	0
Cigna Corp.	COM	125509109	201	1,241	SH		SOLE	1	1,241	0	0
Cisco Systems, Inc.	COM	17275R102	956	34,803	SH		SOLE	1	34,803	0	0
Citigroup, Inc.	COM	172967424	23,783	430,546	SH		SOLE		430,546	0	0
Coca-Cola Co., The	COM	191216100	752	19,181	SH		SOLE	1	19,181	0	0
Coca-Cola Enterprises, Inc.	COM	19122T109	1,341	30,878	SH		SOLE	1	30,878	0	0
Cognizant Technology Solutions	CL A	192446102	23,437	383,641	SH		SOLE		383,641	0	0
Colgate-Palmolive Co.	COM	194162103	292	4,470	SH		DFND	1	4,470	0	0
ConocoPhillips	COM	20825C104	8,351	135,989	SH		DFND	1	135,989	0	0
Core Laboratories NV	COM	N22717107	5,165	45,294	SH		DFND	1	45,294	0	0
Cummins, Inc.	COM	231021106	2,745	20,921	SH		DFND	1	20,921	0	0
Delta Air Lines, Inc.	COM	247361702	13,494	328,474	SH		SOLE		328,474	0	0
Duke Energy Corp.	COM	26441C204	254	3,603	SH		SOLE	1	3,603	0	0
EI du Pont de Nemours & Co.	COM	263534109	317	4,950	SH		DFND	1	4,950	0	0
EMC Corp.	COM	268648102	18,125	686,826	SH		SOLE		686,826	0	0
EQT Corp.	COM	26884L109	7,568	93,046	SH		SOLE		93,046	0	0
Eaton Corp PLC	SHS	G29183103	2,840	42,086	SH		SOLE		42,086	0	0
Ecolab, Inc.	COM	278865100	6,841	60,498	SH		DFND	1	60,498	0	0
Eli Lilly & Co.	COM	532457108	559	6,692	SH		SOLE	1	6,692	0	0
Essendant Inc	COM	296689102	8,083	205,938	SH		SOLE		205,938	0	0
Estee Lauder Cos, Inc., Class	CL A	518439104	26,325	303,770	SH		DFND	1	303,770	0	0
Exactech, Inc.	COM	30064E109	4,339	208,295	SH		SOLE		208,295	0	0
ExlService Holdings, Inc.	COM	302081104	10,284	297,405	SH		SOLE		297,405	0	0
Expeditors Int. of Washington,	COM	302130109	2,416	52,392	SH		SOLE		52,392	0	0
Express Scripts Holding Co.	COM	30219G108	23,768	267,241	SH		SOLE		267,241	0	0
FBR & Co.	COM	30247C400	5,454	235,676	SH		SOLE		235,676	0	0
Facebook, Inc., Class A	CL A	30303M102	24,946	290,866	SH		DFND	1	290,866	0	0
FedEx Corp.	COM	31428X106	219	1,283	SH		SOLE	1	1,283	0	0
Ford Motor Co.	COM PAR $0.01	345370860	16,546	1,102,333	SH		SOLE		1,102,333	0	0
Fox Chase Bancorp, Inc.	COM	35137T108	7,137	421,834	SH		SOLE		421,834	0	0
Frontier Communications Corp.	COM	35906A108	177	35,752	SH		SOLE	1	35,752	0	0
General Electric Co.	COM	369604103	1,279	48,146	SH		SOLE	1	48,146	0	0
General Mills, Inc.	COM	370334104	3,024	54,266	SH		DFND	1	54,266	0	0
Gilead Sciences, Inc.	COM	375558103	19,051	162,716	SH		DFND	1	162,716	0	0
Goldman Sachs Group, Inc., The	COM	38141G104	18,294	87,621	SH		SOLE		87,621	0	0
Google, Inc., Class A	CL A	38259P508	15,575	28,840	SH		DFND	1	28,840	0	0
Google, Inc., Class C	CL C	38259P706	13,338	25,625	SH		DFND	1	25,625	0	0
Halyard Health, Inc.	COM	40650V100	3,882	95,856	SH		SOLE		95,856	0	0
Hess Corp.	COM	42809H107	19,563	292,505	SH		SOLE		292,505	0	0
Hewlett-Packard Co.	COM	428236103	308	10,254	SH		SOLE	1	10,254	0	0
Hologic, Inc.	COM	436440101	13,533	355,571	SH		DFND	1	355,571	0	0
Home Depot, Inc., The	COM	437076102	18,553	166,945	SH		DFND	1	166,945	0	0
HomeTrust Bancshares, Inc.	COM	437872104	8,104	483,554	SH		SOLE		483,554	0	0
Honeywell International, Inc.	COM	438516106	491	4,811	SH		SOLE	1	4,811	0	0
IBM	COM	459200101	845	5,194	SH		DFND	1	5,194	0	0
ICF International, Inc.	COM	44925C103	3,780	108,443	SH		SOLE		108,443	0	0
Independent Bank Corp.	COM	453836108	11,105	236,828	SH		SOLE		236,828	0	0
Ingram Micro, Inc., Class A	CL A	457153104	19,112	763,580	SH		SOLE		763,580	0	0
Intel Corp.	COM	458140100	13,718	451,012	SH		SOLE		451,012	0	0
Intuit, Inc.	COM	461202103	2,499	24,801	SH		DFND	1	24,801	0	0
Investors Bancorp, Inc.	COM	46146L101	23,746	1,930,559	SH		SOLE		1,930,559	0	0
Jamba, Inc.	COM	47023A309	6,290	406,042	SH		SOLE		406,042	0	0
Kellogg Co.	COM	487836108	1,297	20,681	SH		SOLE	1	20,681	0	0
Keurig Green Mountain, Inc.	COM	49271M100	1,060	13,838	SH		DFND	1	13,838	0	0
KeyCorp.	COM	493267108	1,508	100,384	SH		SOLE	1	100,384	0	0
Knoll, Inc.	COM	498904200	12,032	480,693	SH		SOLE		480,693	0	0
Kraft Foods Group, Inc.	COM	50076Q106	401	4,711	SH		SOLE	1	4,711	0	0
LaSalle Hotel Properties, REIT	COM SH BEN INT	517942108	15,317	431,948	SH		SOLE		431,948	0	0
Laboratory Corp of America Hol	COM	50540R409	4,881	40,268	SH		SOLE		40,268	0	0
Laclede Group, Inc., The	COM	505597104	17,220	330,775	SH		SOLE		330,775	0	0
Landstar System, Inc.	COM	515098101	1,892	28,290	SH		SOLE		28,290	0	0
Libbey, Inc.	COM	529898108	4,091	98,988	SH		SOLE		98,988	0	0
Lockheed Martin Corp.	COM	539830109	1,324	7,124	SH		SOLE	1	7,124	0	0
Lowe's Cos., Inc.	COM	548661107	2,396	35,782	SH		SOLE		35,782	0	0
Lydall, Inc.	COM	550819106	3,533	119,521	SH		SOLE		119,521	0	0
LyondellBasell Industries NV,	SHS - A -	N53745100	10,870	105,000	SH		SOLE		105,000	0	0
MRC Global, Inc.	COM	55345K103	8,763	567,551	SH		SOLE		567,551	0	0
Macy's, Inc.	COM	55616P104	3,736	55,370	SH		SOLE		55,370	0	0
Marriott International, Inc.,	CL A	571903202	3,225	43,347	SH		DFND	1	43,347	0	0
Masco Corp.	COM	574599106	5,803	217,598	SH		DFND	1	217,598	0	0
MasterCard, Inc., Class A	CL A	57636Q104	3,734	39,946	SH		DFND	1	39,946	0	0
McDonald's Corp.	COM	580135101	12,851	135,172	SH		SOLE		135,172	0	0
Mead Johnson Nutrition Co.	COM	582839106	15,701	174,033	SH		DFND	1	174,033	0	0
Men's Wearhouse, Inc., The	COM	587118100	8,466	132,129	SH		SOLE		132,129	0	0
Merck & Co., Inc.	COM	58933Y105	28,790	505,702	SH		SOLE		505,702	0	0
Meridian Bancorp, Inc.	COM	58958U103	10,747	801,407	SH		SOLE		801,407	0	0
MetLife, Inc.	COM	59156R108	260	4,635	SH		SOLE	1	4,635	0	0
Michael Kors Holdings, Ltd.	SHS	G60754101	489	11,621	SH		DFND	1	11,621	0	0
Microsoft Corp.	COM	594918104	30,762	696,759	SH		DFND	1	696,759	0	0
Mondelez International, Inc.,	CL A	609207105	333	8,086	SH		SOLE	1	8,086	0	0
Morgan Stanley	COM	617446448	32,557	839,308	SH		SOLE		839,308	0	0
Mylan NV	SHS EURO	BVFMFG8	1,764	26,000	SH		SOLE		26,000	0	0
NIKE, Inc., Class B	CL B	654106103	23,477	217,340	SH		DFND	1	217,340	0	0
NN, Inc.	COM	629337106	6,838	267,963	SH		SOLE		267,963	0	0
NXP Semiconductor NV	COM	N6596X109	6,883	70,094	SH		SOLE		70,094	0	0
Natus Medical, Inc.	COM	639050103	11,504	270,300	SH		SOLE		270,300	0	0
Newell Rubbermaid, Inc.	COM	651229106	16,804	408,759	SH		SOLE		408,759	0	0
Nordson Corp.	COM	655663102	5,388	69,176	SH		SOLE		69,176	0	0
Nucor Corp.	COM	670346105	12,658	287,222	SH		SOLE		287,222	0	0
ONE Gas, Inc.	COM	68235P108	9,644	226,596	SH		SOLE		226,596	0	0
Occidental Petroleum Corp.	COM	674599105	13,624	175,187	SH		SOLE		175,187	0	0
Oracle Corp.	COM	68389x105	20,157	500,172	SH		DFND	1	500,172	0	0
Oshkosh Corp.	COM	688239201	10,343	244,046	SH		SOLE		244,046	0	0
PNC Financial Services Group,	COM	693475105	5,539	57,904	SH		SOLE		57,904	0	0
Pall Corp.	COM	696429307	351	2,820	SH		DFND	1	2,820	0	0
PepsiCo, Inc.	COM	713448108	26,718	286,243	SH		DFND	1	286,243	0	0
Phillips 66	COM	718546104	213	2,639	SH		SOLE	1	2,639	0	0
Physicians Realty Trust, REIT	COM	71943U104	6,653	433,117	SH		SOLE		433,117	0	0
Pioneer Natural Resources Co.	COM	723787107	13,068	94,227	SH		SOLE		94,227	0	0
Plantronics, Inc.	COM	727493108	5,349	94,989	SH		SOLE		94,989	0	0
Praxair, Inc.	COM	74005P104	3,061	25,602	SH		DFND	1	25,602	0	0
Procter & Gamble Co., The	COM	742718109	23,018	294,195	SH		DFND	1	294,195	0	0
QUALCOMM, Inc.	COM	747525103	2,412	38,505	SH		SOLE		38,505	0	0
Quanta Services, Inc.	COM	30064E109	1,934	67,119	SH		SOLE		67,119	0	0
Quintiles Transnational Holdin	COM	74876Y101	6,686	92,077	SH		SOLE		92,077	0	0
Red Hat, Inc.	COM	756577102	2,014	26,525	SH		SOLE		26,525	0	0
Roper Technologies, Inc.	COM	776696106	3,163	18,343	SH		SOLE		18,343	0	0
Ryder System, Inc.	COM	783549108	5,337	61,089	SH		SOLE		61,089	0	0
Sally Beauty Holdings Inc	COM	B1GZ005	5,017	158,878	SH		SOLE		158,878	0	0
Scripps Networks Interactive,	CL A COM	811065101	3,363	51,446	SH		DFND	1	51,446	0	0
Sirona Dental Systems, Inc.	COM	82966C103	10,423	103,791	SH		SOLE		103,791	0	0
SolarCity Corp.	COM	83416T100	1,921	35,882	SH		SOLE		35,882	0	0
Stanley Black & Decker, Inc.	COM	854502101	3,779	35,907	SH		SOLE		35,907	0	0
Starbucks Corp.	COM	855244109	3,086	57,558	SH		SOLE		57,558	0	0
State Street Corp.	COM	857477103	2,838	36,862	SH		SOLE		36,862	0	0
Stericycle, Inc.	COM	858912108	23,467	175,247	SH		SOLE		175,247	0	0
SunPower Corp.	COM	867652406	1,767	62,192	SH		SOLE		62,192	0	0
Syntel, Inc.	COM	87162H103	16,922	356,409	SH		SOLE		356,409	0	0
T Rowe Price Group, Inc.	COM	74144T108	19,032	244,853	SH		SOLE		244,853	0	0
T-Mobile US, Inc.	COM	872590104	1,594	41,105	SH		SOLE		41,105	0	0
Tableau Software, Inc., Class	CL A	87336U105	1,198	10,387	SH		SOLE		10,387	0	0
Teradyne, Inc.	COM	880770102	6,003	311,223	SH		SOLE		311,223	0	0
Texas Instruments, Inc.	COM	882508104	3,111	60,398	SH		DFND	1	60,398	0	0
TheStreet, Inc.	COM	88368Q103	2,483	1,371,653	SH		SOLE		1,371,653	0	0
Thermo Fisher Scientific, Inc.	COM	883556102	4,398	33,896	SH		SOLE		33,896	0	0
Thermon Group Holdings, Inc.	COM	88362t103	9,597	398,714	SH		SOLE		398,714	0	0
TiVo, Inc.	COM	888706108	8,346	823,070	SH		SOLE		823,070	0	0
Time Warner, Inc.	COM	887317303	25,338	289,875	SH		SOLE		289,875	0	0
Ulta Salon Cosmetics & Fragran	COM	90384S303	544	3,520	SH		SOLE	1	3,520	0	0
Ultra Petroleum Corp.	COM	903914109	5,261	420,217	SH		SOLE		420,217	0	0
United Financial Bancorp., Inc	COM	910304104	4,695	349,039	SH		SOLE		349,039	0	0
United Parcel Service, Inc., C	CL B	911312106	10,596	109,342	SH		DFND	1	109,342	0	0
United Technologies Corp.	COM	913017109	472	4,258	SH		SOLE	1	4,258	0	0
UnitedHealth Group, Inc.	COM	91324p102	48,260	395,573	SH		SOLE		395,573	0	0
Unitil Corp.	COM	913259107	6,717	203,426	SH		SOLE		203,426	0	0
VF Corp.	COM	918204108	19,368	277,724	SH		DFND	1	277,724	0	0
Verint Systems, Inc.	COM	92343X100	10,252	168,777	SH		SOLE		168,777	0	0
Verizon Communications, Inc.	COM	92343V104	10,029	215,162	SH		DFND	1	215,162	0	0
Visa, Inc., Class A	COM CL A	92826C839	3,691	54,972	SH		DFND	1	54,972	0	0
Vodafone Group PLC, ADR	SPNSR ADR NO PAR	92857W308	1,152	31,600	SH		SOLE		31,600	0	0
WCI Communities, Inc.	COM PAR $0.01	92923C807	9,314	381,882	SH		SOLE		381,882	0	0
Walt Disney Co., The	COM DISNEY	254687106	28,774	252,093	SH		DFND	1	252,093	0	0
Westell Technologies, Inc., Cl	CL A	957541105	1,238	1,250,986	SH		SOLE		1,250,986	0	0
Weyerhaeuser Co., REIT	COM	962166104	3,125	99,194	SH		DFND	1	99,194	0	0
White Mountains Insurance Grou	COM	G9618E107	20,720	31,636	SH		SOLE		31,636	0	0
Whole Foods Market, Inc.	COM	966837106	2,444	61,979	SH		DFND	1	61,979	0	0
Xerox Corp	COM	984121103	1,423	133,723	SH		SOLE	1	133,723	0	0
Zoetis, Inc.	CL A	98978V103	11,276	233,854	SH		SOLE		233,854	0	0
eBay, Inc.	COM	278642103	11,321	187,939	SH		SOLE		187,939	0	0
lululemon athletica, Inc.	COM	550021109	445	6,808	SH		SOLE	1	6,808	0	0
salesforce.com, inc.	COM	79466L302	2,818	40,478	SH		SOLE		40,478	0	0
iShares MSCI EAFE ETF	MSCI EAFE ETF	464287465	1,529	24,080	SH		SOLE		24,080	0	0