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	31,243	189,407	SH		SOLE	0	189,407	0	0
ACI Worldwide, Inc.	COM	004498101	5,496	253,748	SH		SOLE	0	253,748	0	0
ASML Holding NV	N Y REGISTRY SHS	N07059210	1,333	13,198	SH		SOLE	0	13,198	0	0
AT&T, Inc.	COM	00206R102	13,217	404,814	SH		DFND	0,1	404,814	0	0
Abbott Laboratories	COM	002824100	5,332	115,084	SH		DFND	0,1	115,084	0	0
Abbvie, Inc.	COM	00287Y109	11,741	200,567	SH		SOLE	0	200,567	0	0
Accenture PLC, Class A	SHS CLASS A	G1151C101	267	2,848	SH		SOLE	1	2,848	0	0
Aetna, Inc.	COM	00817Y108	1,499	14,071	SH		SOLE	1	14,071	0	0
Agilent Technologies, Inc.	COM	00846U101	2,248	54,110	SH		SOLE	0	54,110	0	0
Alexion Pharmaceuticals, Inc.	COM	015351109	1,457	8,408	SH		SOLE	0	8,408	0	0
Amazon.com, Inc.	COM	023135106	13,098	35,199	SH		SOLE	0	35,199	0	0
Amdocs, Ltd.	SHS	G02602103	31,964	587,575	SH		SOLE	0	587,575	0	0
American Express Co.	COM	025816109	13,316	170,454	SH		SOLE	0	170,454	0	0
American Tower Corp., REIT	COM	03027X100	36,881	391,728	SH		DFND	0,1	391,728	0	0
American Water Works Co., Inc.	COM	030420103	2,971	54,814	SH		DFND	0,1	54,814	0	0
Apache Corp.	COM	037411105	16,319	270,500	SH		SOLE	0	270,500	0	0
Apple, Inc.	COM	037833100	72,978	586,501	SH		SOLE	0	586,501	0	0
Axiall Corp.	COM	05463D100	14,622	311,506	SH		SOLE	0	311,506	0	0
Bank of New York Mellon Corp.,	COM	064058100	25,036	622,156	SH		SOLE	0	622,156	0	0
Becton Dickinson & Co.	COM	075887109	50,171	349,405	SH		DFND	0,1	349,405	0	0
Berkshire Hathaway, Inc., Clas	CL B NEW	084670702	1,050	7,276	SH		SOLE	1	7,276	0	0
Biogen Idec, Inc.	COM	09062X103	2,608	6,176	SH		DFND	0,1	6,176	0	0
BlackRock, Inc.	COM	09247X101	41,214	112,655	SH		SOLE	0	112,655	0	0
BorgWarner, Inc.	COM	099724106	11,651	192,649	SH		SOLE	0	192,649	0	0
Bristol-Myers Squibb Co.	COM	110122108	3,412	52,903	SH		DFND	0,1	52,903	0	0
Broadridge Financial Solutions	COM	11133T103	3,180	57,815	SH		SOLE	0	57,815	0	0
Brookdale Senior Living, Inc.	COM	112463104	12,877	341,035	SH		SOLE	0	341,035	0	0
CBRE Group, Inc., Class A	CL A	12504L109	3,000	77,497	SH		SOLE	0	77,497	0	0
CSX Corp.	COM	126408103	8,114	245,000	SH		SOLE	0	245,000	0	0
Cabelas, Inc.	COM	126804301	16,682	298,002	SH		SOLE	0	298,002	0	0
Campbell Soup Co.	COM	134429109	447	9,600	SH		SOLE	1	9,600	0	0
Cantel Medical Corp.	COM	138098108	6,897	145,193	SH		SOLE	0	145,193	0	0
Cape Bancorp, Inc.	COM	139209100	1,284	134,303	SH		SOLE	0	134,303	0	0
Capitol Federal Financial, Inc	COM	14057j101	19,696	1,575,648	SH		SOLE	0	1,575,648	0	0
Carter's, Inc.	COM	146229109	14,950	161,677	SH		SOLE	0	161,677	0	0
Celgene Corp.	COM	151020104	27,230	236,208	SH		SOLE	0	236,208	0	0
Cisco Systems, Inc.	COM	17275R102	958	34,803	SH		SOLE	1	34,803	0	0
Citigroup, Inc.	COM	172967424	18,547	360,000	SH		SOLE	0	360,000	0	0
Coca-Cola Co., The	COM	191216100	757	18,677	SH		SOLE	1	18,677	0	0
Coca-Cola Enterprises, Inc.	COM	19122T109	1,365	30,878	SH		SOLE	1	30,878	0	0
Cognizant Technology Solutions	CL A	192446102	21,438	343,614	SH		SOLE	0	343,614	0	0
Colgate-Palmolive Co.	COM	194162103	5,153	74,316	SH		DFND	0,1	74,316	0	0
ConocoPhillips	COM	20825C104	350	5,622	SH		SOLE	1	5,622	0	0
Core Laboratories NV	COM	N22717107	5,466	52,316	SH		DFND	0,1	52,316	0	0
Cummins, Inc.	COM	231021106	3,197	23,059	SH		DFND	0,1	23,059	0	0
Delta Air Lines, Inc.	COM	247361702	16,215	360,656	SH		SOLE	0	360,656	0	0
DirecTV	COM	25490A309	1,661	19,524	SH		SOLE	0	19,524	0	0
Discover Financial Services	COM	254709108	8,687	154,161	SH		SOLE	0	154,161	0	0
Duke Energy Corp.	COM	26441C204	252	3,276	SH		SOLE	1	3,276	0	0
EI du Pont de Nemours & Co.	COM	263534109	18,097	253,217	SH		DFND	0,1	253,217	0	0
EMC Corp.	COM	268648102	18,849	737,447	SH		SOLE	0	737,447	0	0
EQT Corp.	COM	26884L109	8,551	103,191	SH		SOLE	0	103,191	0	0
Eaton Corp PLC	SHS	G29183103	2,866	42,187	SH		SOLE	0	42,187	0	0
Ecolab, Inc.	COM	278865100	2,433	21,269	SH		DFND	0,1	21,269	0	0
Eli Lilly & Co.	COM	532457108	305	4,195	SH		SOLE	1	4,195	0	0
Estee Lauder Cos, Inc., Class	CL A	518439104	25,265	303,812	SH		DFND	0,1	303,812	0	0
Evolving Systems, Inc.	COM	30049R209	1,932	221,824	SH		SOLE	0	221,824	0	0
Exactech, Inc.	COM	30064E109	4,852	189,322	SH		SOLE	0	189,322	0	0
ExlService Holdings, Inc.	COM	302081104	6,983	187,704	SH		SOLE	0	187,704	0	0
Expeditors Int. of Washington,	COM	302130109	2,527	52,445	SH		SOLE	0	52,445	0	0
Express Scripts Holding Co.	COM	30219G108	22,304	257,053	SH		SOLE	0	257,053	0	0
FBR & Co.	COM	30247C400	4,979	215,464	SH		SOLE	0	215,464	0	0
Facebook, Inc., Class A	CL A	30303M102	23,387	284,463	SH		DFND	0,1	284,463	0	0
FedEx Corp.	COM	31428X106	211	1,276	SH		SOLE	1	1,276	0	0
Ford Motor Co.	COM PAR $0.01	345370860	16,958	1,050,700	SH		SOLE	0	1,050,700	0	0
Fox Chase Bancorp, Inc.	COM	35137T108	6,215	369,252	SH		SOLE	0	369,252	0	0
Frontier Communications Corp.	COM	35906A108	252	35,752	SH		SOLE	1	35,752	0	0
General Electric Co.	COM	369604103	1,148	46,274	SH		SOLE	1	46,274	0	0
General Mills, Inc.	COM	370334104	3,056	53,999	SH		DFND	0,1	53,999	0	0
Gilead Sciences, Inc.	COM	375558103	15,993	162,980	SH		DFND	0,1	162,980	0	0
Goldman Sachs Group, Inc., The	COM	38141G104	16,471	87,627	SH		SOLE	0	87,627	0	0
Google, Inc., Class A	CL A	38259P508	15,946	28,747	SH		DFND	0,1	28,747	0	0
Google, Inc., Class C	CL C	38259P706	13,952	25,460	SH		DFND	0,1	25,460	0	0
Hampden Bancorp, Inc.	COM	40867E107	2,179	98,452	SH		SOLE	0	98,452	0	0
Hess Corp.	COM	42809H107	9,651	142,196	SH		SOLE	0	142,196	0	0
Hewlett-Packard Co.	COM	428236103	320	10,254	SH		SOLE	1	10,254	0	0
Hologic, Inc.	COM	436440101	25,695	778,042	SH		DFND	0,1	778,042	0	0
Home Depot, Inc., The	COM	437076102	16,055	141,321	SH		DFND	0,1	141,321	0	0
Hometrust Bancshares, Inc.	COM	437872104	6,358	398,126	SH		SOLE	0	398,126	0	0
Honeywell International, Inc.	COM	438516106	346	3,315	SH		SOLE	1	3,315	0	0
IBM	COM	459200101	700	4,363	SH		DFND	0,1	4,363	0	0
Independent Bank Corp.	COM	453836108	8,663	197,469	SH		SOLE	0	197,469	0	0
Ingram Micro Inc., Class A	CL A	457153104	1,823	72,552	SH		SOLE	0	72,552	0	0
Innophos Holdings, Inc.	COM	45774N108	4,383	77,761	SH		SOLE	0	77,761	0	0
Intel Corp.	COM	458140100	23,328	746,028	SH		SOLE	0	746,028	0	0
International Paper Co.	COM	460146103	27,278	491,579	SH		SOLE	0	491,579	0	0
Intuit, Inc.	COM	461202103	2,264	23,353	SH		DFND	0,1	23,353	0	0
Investors Bancorp, Inc.	COM	46146L101	20,229	1,726,001	SH		SOLE	0	1,726,001	0	0
Jamba, Inc.	COM	47023A309	3,175	215,814	SH		SOLE	0	215,814	0	0
Kellogg Co.	COM	487836108	1,364	20,681	SH		SOLE	1	20,681	0	0
KeyCorp.	COM	493267108	1,421	100,384	SH		SOLE	1	100,384	0	0
Knoll, Inc.	COM	498904200	8,978	383,173	SH		SOLE	0	383,173	0	0
Kraft Foods Group, Inc.	COM	50076Q106	203	2,327	SH		SOLE	1	2,327	0	0
LaSalle Hotel Properties, REIT	COM SH BEN INT	517942108	14,478	372,566	SH		SOLE	0	372,566	0	0
Laboratory Corp of America Hol	COM	50540R409	3,714	29,455	SH		SOLE	0	29,455	0	0
Laclede Group, Inc., The	COM	505597104	11,332	221,234	SH		SOLE	0	221,234	0	0
Landstar System, Inc.	COM	515098101	2,209	33,314	SH		SOLE	0	33,314	0	0
Libbey, Inc.	COM	529898108	5,296	132,699	SH		SOLE	0	132,699	0	0
Lockheed Martin Corp.	COM	539830109	1,446	7,124	SH		SOLE	1	7,124	0	0
Lowe's Cos., Inc.	COM	548661107	1,392	18,715	SH		SOLE	0	18,715	0	0
Lydall, Inc.	COM	550819106	4,528	142,755	SH		SOLE	0	142,755	0	0
Macy's, Inc.	COM	55616P104	3,285	50,608	SH		SOLE	0	50,608	0	0
Marriott International, Inc.,	CL A	571903202	3,480	43,326	SH		DFND	0,1	43,326	0	0
Masco Corp.	COM	574599106	5,259	196,962	SH		DFND	0,1	196,962	0	0
MasterCard, Inc., Class A	CL A	57636Q104	3,449	39,926	SH		DFND	0,1	39,926	0	0
McDonald's Corp.	COM	580135101	10,231	105,000	SH		SOLE	0	105,000	0	0
Mead Johnson Nutrition Co.	COM	582839106	16,480	163,929	SH		DFND	0,1	163,929	0	0
Men's Wearhouse, Inc.	COM	587118100	5,687	108,939	SH		SOLE	0	108,939	0	0
Merck & Co., Inc.	COM	58933Y105	29,067	505,683	SH		SOLE	0	505,683	0	0
Meridian Bancorp, Inc.	COM	58958U103	8,918	677,168	SH		SOLE	0	677,168	0	0
MetLife, Inc.	COM	59156R108	216	4,271	SH		SOLE	1	4,271	0	0
Michael Kors Holdings, Ltd.	SHS	G60754101	764	11,621	SH		DFND	0,1	11,621	0	0
Microsoft Corp.	COM	594918104	32,151	790,827	SH		DFND	0,1	790,827	0	0
Mondelez International, Inc.,	CL A	609207105	277	7,687	SH		SOLE	1	7,687	0	0
Morgan Stanley	COM	617446448	29,966	839,612	SH		SOLE	0	839,612	0	0
Mylan, Inc.	COM	628530107	353	5,955	SH		SOLE	0	5,955	0	0
NIKE, Inc., Class B	CL B	654106103	21,728	216,563	SH		DFND	0,1	216,563	0	0
NN, Inc.	COM	629337106	5,564	221,846	SH		SOLE	0	221,846	0	0
NXP Semiconductor NV	COM	N6596X109	4,014	40,000	SH		SOLE	0	40,000	0	0
Natus Medical, Inc.	COM	639050103	9,432	238,974	SH		SOLE	0	238,974	0	0
Newell Rubbermaid, Inc.	COM	651229106	17,165	439,339	SH		SOLE	0	439,339	0	0
Nordson Corp.	COM	655663102	10,824	138,161	SH		SOLE	0	138,161	0	0
Nucor Corp.	COM	670346105	13,649	287,157	SH		SOLE	0	287,157	0	0
ONE Gas, Inc.	COM	68235P108	9,797	226,629	SH		SOLE	0	226,629	0	0
Occidental Petroleum Corp.	COM	674599105	9,125	125,000	SH		SOLE	0	125,000	0	0
Open Text Corp.	COM	683715106	9,624	181,954	SH		SOLE	0	181,954	0	0
Oracle Corp.	COM	68389x105	21,592	500,396	SH		DFND	0,1	500,396	0	0
Oshkosh Corp.	COM	688239201	13,703	280,851	SH		SOLE	0	280,851	0	0
PNC Financial Services Group,	COM	693475105	5,222	56,006	SH		SOLE	0	56,006	0	0
Pall Corp.	COM	696429307	9,705	96,673	SH		DFND	0,1	96,673	0	0
PepsiCo, Inc.	COM	713448108	25,727	269,058	SH		DFND	0,1	269,058	0	0
Physicians Realty Trust, REIT	COM	71943U104	5,601	318,044	SH		SOLE	0	318,044	0	0
Pioneer Natural Resources Co.	COM	723787107	26,830	164,085	SH		SOLE	0	164,085	0	0
Plantronics, Inc.	COM	727493108	3,538	66,822	SH		SOLE	0	66,822	0	0
Praxair, Inc.	COM	74005P104	2,848	23,586	SH		DFND	0,1	23,586	0	0
Priceline Group, Inc., The	COM	741503403	1,056	907	SH		SOLE	0	907	0	0
Procter & Gamble Co., The	COM	742718109	19,733	240,826	SH		DFND	0,1	240,826	0	0
QUALCOMM, Inc.	COM	747525103	2,671	38,517	SH		SOLE	0	38,517	0	0
Quanta Services, Inc.	COM	74762E102	1,930	67,663	SH		SOLE	0	67,663	0	0
Quintiles Transnational Holdin	COM	74876Y101	5,887	87,911	SH		SOLE	0	87,911	0	0
Red Hat, Inc.	COM	756577102	2,008	26,514	SH		SOLE	0	26,514	0	0
Roper Industries, Inc.	COM	776696106	3,160	18,370	SH		SOLE	0	18,370	0	0
Ryder System, Inc.	COM	783549108	6,273	66,109	SH		SOLE	0	66,109	0	0
SEI Investments Co.	COM	784117103	3,174	71,986	SH		SOLE	0	71,986	0	0
Scripps Networks Interactive,	CL A COM	811065101	2,797	40,802	SH		DFND	0,1	40,802	0	0
Sirona Dental Systems, Inc.	COM	82966C103	8,918	99,095	SH		SOLE	0	99,095	0	0
Solarcity Corp.	COM	83416T100	1,839	35,866	SH		SOLE	0	35,866	0	0
Sonus Networks, Inc.	COM	835916503	2,027	257,198	SH		SOLE	0	257,198	0	0
Stanley Black & Decker, Inc.	COM	854502101	3,427	35,934	SH		SOLE	0	35,934	0	0
Starbucks Corp.	COM	855244109	3,060	32,310	SH		SOLE	0	32,310	0	0
State Street Corp.	COM	857477103	2,718	36,970	SH		SOLE	0	36,970	0	0
Stericycle, Inc.	COM	858912108	24,609	175,240	SH		SOLE	0	175,240	0	0
SunPower Corp.	COM	867652406	1,540	49,197	SH		SOLE	0	49,197	0	0
Syntel, Inc.	COM	87162H103	13,280	256,716	SH		SOLE	0	256,716	0	0
T Mobile USA, Inc.	COM	872590104	3,521	111,105	SH		SOLE	0	111,105	0	0
T Rowe Price Group, Inc.	COM	74144T108	19,826	244,825	SH		SOLE	0	244,825	0	0
TJX Cos., Inc., The	COM	872540109	212	3,024	SH		SOLE	1	3,024	0	0
Tableau Software, Inc., Class	CL A	87336U105	957	10,342	SH		SOLE	0	10,342	0	0
Teradyne, Inc.	COM	880770102	8,436	447,514	SH		SOLE	0	447,514	0	0
Texas Instruments, Inc.	COM	882508104	3,708	64,846	SH		DFND	0,1	64,846	0	0
TheStreet, Inc.	COM	88368Q103	2,469	1,371,653	SH		SOLE	0	1,371,653	0	0
Thermo Fisher Scientific, Inc.	COM	883556102	4,520	33,649	SH		SOLE	0	33,649	0	0
Thermon Group Holdings, Inc.	COM	88362t103	6,996	290,660	SH		SOLE	0	290,660	0	0
TiVo, Inc.	COM	888706108	7,578	714,220	SH		SOLE	0	714,220	0	0
Time Warner, Inc.	COM	887317303	23,346	276,485	SH		SOLE	0	276,485	0	0
Ulta Salon Cosmetics & Fragran	COM	90384S303	531	3,520	SH		SOLE	1	3,520	0	0
Ultra Petroleum Corp.	COM	903914109	6,654	425,740	SH		SOLE	0	425,740	0	0
United Financial Bancorp., Inc	COM	910304104	5,582	449,039	SH		SOLE	0	449,039	0	0
United Parcel Service, Inc., C	CL B	911312106	3,179	32,794	SH		DFND	0,1	32,794	0	0
United Stationers, Inc.	COM	913004107	7,472	182,298	SH		SOLE	0	182,298	0	0
United Technologies Corp.	COM	913017109	471	4,023	SH		SOLE	1	4,023	0	0
UnitedHealth Group, Inc.	COM	91324p102	46,789	395,544	SH		SOLE	0	395,544	0	0
Unitil Corp.	COM	913259107	3,497	100,564	SH		SOLE	0	100,564	0	0
VF Corp.	COM	918204108	23,997	318,639	SH		DFND	0,1	318,639	0	0
Verint Systems, Inc.	COM	92343X100	5,846	94,404	SH		SOLE	0	94,404	0	0
Verizon Communications, Inc.	COM	92343V104	10,283	211,445	SH		DFND	0,1	211,445	0	0
Visa, Inc., Class A	CL A	92826C839	3,393	51,877	SH		DFND	0,1	51,877	0	0
Vodafone Group PLC, ADR	SPNSR ADR NO PAR	92857W308	1,035	31,659	SH		SOLE	0	31,659	0	0
Walt Disney Co., The	COM DISNEY	254687106	26,420	251,881	SH		DFND	0,1	251,881	0	0
Westell Technologies, Inc., Cl	CL A	957541105	1,639	1,250,986	SH		SOLE	0	1,250,986	0	0
Weyerhaeuser Co., REIT	COM	962166104	3,287	99,146	SH		DFND	0,1	99,146	0	0
Whirlpool Corp.	COM	963320106	1,316	6,513	SH		SOLE	0	6,513	0	0
White Mountains Insurance Grou	COM	G9618E107	13,133	19,186	SH		SOLE	0	19,186	0	0
Xerox Corp	COM	984121103	1,275	99,233	SH		SOLE	1	99,233	0	0
Zoetis, Inc.	CL A	98978V103	11,591	250,399	SH		SOLE	0	250,399	0	0
eBay, Inc.	COM	278642103	10,828	187,720	SH		SOLE	0	187,720	0	0
lululemon athletica, Inc.	COM	550021109	436	6,808	SH		SOLE	1	6,808	0	0
salesforce.com, inc.	COM	79466L302	2,910	43,555	SH		SOLE	0	43,555	0	0
SPDR Barclays Capital High Yie	BRC HGH YLD BD	78464A417	6,533	166,581	SH		SOLE	0	166,581	0	0
SPDR S&P 500 ETF Trust	TR UNIT	78462f103	224	1,087	SH		SOLE	1	1,087	0	0
iShares MSCI EAFE ETF	MSCI EAFE ETF	464287465	461	7,186	SH		SOLE	1	7,186	0	0
iShares iBoxx High Yield Corp.	IBOXX HI YD ETF	464288513	7,955	87,797	SH		SOLE	0	87,797	0	0