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	31,109	189,319	SH		SOLE	0	189,319	0	0
ASML Holding NV	N Y REGISTRY SHS	N07059210	1,997	18,522	SH		SOLE	0	18,522	0	0
AT&T, Inc.	COM	00206R102	13,539	403,073	SH		DFND	0,1	403,073	0	0
Abbott Laboratories	COM	002824100	5,132	113,997	SH		DFND	0,1	113,997	0	0
Abbvie, Inc.	COM	00287Y109	26,869	410,587	SH		SOLE	0	410,587	0	0
Accenture PLC, Class A	SHS CLASS A	G1151C101	230	2,571	SH		SOLE	1	2,571	0	0
Aetna, Inc.	COM	00817Y108	1,250	14,071	SH		SOLE	1	14,071	0	0
Agilent Technologies, Inc.	COM	00846U101	2,207	53,912	SH		SOLE	0	53,912	0	0
Alexion Pharmaceuticals, Inc.	COM	015351109	1,856	10,029	SH		SOLE	0	10,029	0	0
Amazon.com, Inc.	COM	023135106	3,930	12,663	SH		SOLE	0	12,663	0	0
Amdocs, Ltd.	SHS	G02602103	23,044	493,922	SH		SOLE	0	493,922	0	0
American Express Co.	COM	025816109	30,747	330,473	SH		SOLE	0	330,473	0	0
American Tower Corp., REIT	COM	03027X100	29,785	301,320	SH		DFND	0,1	301,320	0	0
American Water Works Co., Inc.	COM	030420103	2,910	54,606	SH		DFND	0,1	54,606	0	0
Apache Corp.	COM	037411105	1,253	20,000	SH		SOLE	0	20,000	0	0
Apple, Inc.	COM	037833100	64,967	588,572	SH		SOLE	0	588,572	0	0
AvalonBay Communities, Inc., R	COM	053484101	21,985	134,554	SH		SOLE	0	134,554	0	0
Axiall Corp.	COM	05463D100	2,124	50,000	SH		SOLE	0	50,000	0	0
Bank of New York Mellon Corp.,	COM	064058100	25,242	622,190	SH		SOLE	0	622,190	0	0
Becton Dickinson & Co.	COM	075887109	48,615	349,345	SH		DFND	0,1	349,345	0	0
Berkshire Hathaway, Inc., Clas	CL B NEW	084670702	697	4,645	SH		SOLE	1	4,645	0	0
Biogen Idec, Inc.	COM	09062X103	2,088	6,152	SH		DFND	0,1	6,152	0	0
BlackRock, Inc.	COM	09247X101	40,283	112,661	SH		SOLE	0	112,661	0	0
BorgWarner, Inc.	COM	099724106	10,947	199,221	SH		SOLE	0	199,221	0	0
Bristol-Myers Squibb Co.	COM	110122108	3,106	52,621	SH		DFND	0,1	52,621	0	0
Broadridge Financial Solutions	COM	11133T103	3,694	80,000	SH		SOLE	0	80,000	0	0
CBRE Group, Inc., Class A	CL A	12504L109	2,665	77,805	SH		SOLE	0	77,805	0	0
Campbell Soup Co.	COM	134429109	422	9,600	SH		SOLE	1	9,600	0	0
Cantel Medical Corp.	COM	138098108	4,895	113,162	SH		SOLE	0	113,162	0	0
Cape Bancorp, Inc.	COM	139209100	1,264	134,303	SH		SOLE	0	134,303	0	0
Capitol Federal Financial, Inc	COM	14057j101	7,383	577,688	SH		SOLE	0	577,688	0	0
Carter's, Inc.	COM	146229109	4,903	56,157	SH		SOLE	0	56,157	0	0
Celgene Corp.	COM	151020104	28,064	250,887	SH		SOLE	0	250,887	0	0
CenterPoint Energy, Inc.	COM	15189T107	13,327	568,811	SH		DFND	0,1	568,811	0	0
Cisco Systems, Inc.	COM	17275R102	584	20,998	SH		SOLE	1	20,998	0	0
Coca-Cola Co., The	COM	191216100	733	17,373	SH		SOLE	1	17,373	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	16,795	318,928	SH		SOLE	0	318,928	0	0
Colgate-Palmolive Co.	COM	194162103	8,575	123,941	SH		DFND	0,1	123,941	0	0
Columbia Sportswear Co.	COM	198516106	3,599	80,800	SH		SOLE	0	80,800	0	0
ConocoPhillips	COM	20825C104	349	5,053	SH		SOLE	1	5,053	0	0
Core Laboratories NV	COM	N22717107	6,294	52,302	SH		DFND	0,1	52,302	0	0
Cummins, Inc.	COM	231021106	3,299	22,882	SH		DFND	0,1	22,882	0	0
Dealertrack Technologies, Inc.	COM	242309102	4,272	96,401	SH		SOLE	0	96,401	0	0
Delta Air Lines, Inc.	COM	247361702	17,399	353,714	SH		SOLE	0	353,714	0	0
DirecTV	COM	25490A309	9,924	114,463	SH		SOLE	0	114,463	0	0
Discover Financial Services	COM	254709108	17,301	264,176	SH		SOLE	0	264,176	0	0
Duke Energy Corp.	COM	26441C204	257	3,075	SH		SOLE	1	3,075	0	0
EI du Pont de Nemours & Co.	COM	263534109	18,673	252,538	SH		DFND	0,1	252,538	0	0
EMC Corp.	COM	268648102	28,451	956,674	SH		SOLE	0	956,674	0	0
EQT Corp.	COM	26884L109	15,761	208,203	SH		SOLE	0	208,203	0	0
Eaton Corp PLC	SHS	G29183103	2,858	42,056	SH		SOLE	0	42,056	0	0
Ecolab, Inc.	COM	278865100	1,693	16,196	SH		DFND	0,1	16,196	0	0
Eli Lilly & Co.	COM	532457108	288	4,177	SH		SOLE	1	4,177	0	0
Estee Lauder Cos, Inc., Class	CL A	518439104	23,140	303,672	SH		DFND	0,1	303,672	0	0
Evolving Systems, Inc.	COM	30049R209	1,894	202,085	SH		SOLE	0	202,085	0	0
Exactech, Inc.	COM	30064E109	4,065	172,474	SH		SOLE	0	172,474	0	0
ExlService Holdings, Inc.	COM	302081104	3,248	113,143	SH		SOLE	0	113,143	0	0
Expeditors Int. of Washington,	COM	302130109	2,332	52,273	SH		SOLE	0	52,273	0	0
Express Scripts Holding Co.	COM	30219G108	16,425	193,986	SH		SOLE	0	193,986	0	0
FBR & Co.	COM	30247C400	4,827	196,290	SH		SOLE	0	196,290	0	0
Facebook, Inc., Class A	CL A	30303M102	12,587	161,331	SH		DFND	0,1	161,331	0	0
Fox Chase Bancorp, Inc.	COM	35137T108	5,506	330,302	SH		SOLE	0	330,302	0	0
Frontier Communications Corp.	COM	35906A108	238	35,752	SH		SOLE	1	35,752	0	0
Gannett Co., Inc.	COM	364730101	4,227	132,396	SH		SOLE	0	132,396	0	0
General Electric Co.	COM	369604103	1,167	46,175	SH		SOLE	1	46,175	0	0
General Mills, Inc.	COM	370334104	2,356	44,172	SH		DFND	0,1	44,172	0	0
Gilead Sciences, Inc.	COM	375558103	21,721	230,437	SH		DFND	0,1	230,437	0	0
Goldman Sachs Group, Inc., The	COM	38141G104	17,955	92,633	SH		SOLE	0	92,633	0	0
Google, Inc., Class A	CL A	38259P508	24,977	47,068	SH		DFND	0,1	47,068	0	0
Google, Inc., Class C	CL C	38259P706	23,868	45,341	SH		DFND	0,1	45,341	0	0
HCP, Inc., REIT	COM	40414L109	21,440	486,948	SH		DFND	0,1	486,948	0	0
Hampden Bancorp, Inc.	COM	40867E107	2,107	98,452	SH		SOLE	0	98,452	0	0
Hess Corp.	COM	42809H107	10,497	142,204	SH		SOLE	0	142,204	0	0
Hewlett-Packard Co.	COM	428236103	304	7,585	SH		SOLE	1	7,585	0	0
Hologic, Inc.	COM	436440101	21,569	806,604	SH		DFND	0,1	806,604	0	0
Home Depot, Inc., The	COM	437076102	595	5,670	SH		SOLE	1	5,670	0	0
Honeywell International, Inc.	COM	438516106	304	3,044	SH		SOLE	1	3,044	0	0
IBM	COM	459200101	3,385	21,097	SH		DFND	0,1	21,097	0	0
Ingram Micro Inc., Class A	CL A	457153104	2,001	72,392	SH		SOLE	0	72,392	0	0
Innophos Holdings, Inc.	COM	45774N108	2,338	40,000	SH		SOLE	0	40,000	0	0
Intel Corp.	COM	458140100	27,075	746,066	SH		SOLE	0	746,066	0	0
International Paper Co.	COM	460146103	26,340	491,604	SH		SOLE	0	491,604	0	0
Intuit, Inc.	COM	461202103	2,868	31,115	SH		DFND	0,1	31,115	0	0
Investors Bancorp, Inc.	COM	46146L101	6,043	538,390	SH		SOLE	0	538,390	0	0
Jamba, Inc.	COM	47023A309	2,943	195,003	SH		SOLE	0	195,003	0	0
Kellogg Co.	COM	487836108	1,353	20,681	SH		SOLE	1	20,681	0	0
KeyCorp.	COM	493267108	1,395	100,384	SH		SOLE	1	100,384	0	0
Knoll, Inc.	COM	498904200	5,627	265,802	SH		SOLE	0	265,802	0	0
LaSalle Hotel Properties, REIT	COM SH BEN INT	517942108	5,368	132,639	SH		SOLE	0	132,639	0	0
Laboratory Corp of America Hol	COM	50540R409	2,251	20,860	SH		SOLE	0	20,860	0	0
Laclede Group, Inc., The	COM	505597104	5,047	94,873	SH		SOLE	0	94,873	0	0
Landstar System, Inc.	COM	515098101	2,411	33,237	SH		SOLE	0	33,237	0	0
Libbey, Inc.	COM	529898108	4,087	130,000	SH		SOLE	0	130,000	0	0
Lockheed Martin Corp.	COM	539830109	1,372	7,124	SH		SOLE	1	7,124	0	0
Lydall, Inc.	COM	550819106	3,295	100,400	SH		SOLE	0	100,400	0	0
M&T Bank Corp.	COM	55261F104	12,328	98,141	SH		SOLE	0	98,141	0	0
Macy's, Inc.	COM	55616P104	3,027	46,044	SH		SOLE	0	46,044	0	0
Marriott International, Inc.,	CL A	571903202	3,711	47,565	SH		DFND	0,1	47,565	0	0
Masco Corp.	COM	574599106	4,963	196,927	SH		DFND	0,1	196,927	0	0
MasterCard, Inc., Class A	CL A	57636Q104	3,100	35,983	SH		DFND	0,1	35,983	0	0
Mead Johnson Nutrition Co.	COM	582839106	15,972	158,862	SH		DFND	0,1	158,862	0	0
Medtronic, Inc.	COM	585055106	288	3,994	SH		SOLE	1	3,994	0	0
Merck & Co., Inc.	COM	58933Y105	28,151	495,709	SH		SOLE	0	495,709	0	0
Meridian Bancorp, Inc.	COM	58958U103	5,348	476,628	SH		SOLE	0	476,628	0	0
MetLife, Inc.	COM	59156R108	220	4,069	SH		SOLE	1	4,069	0	0
Michael Kors Holdings, Ltd.	SHS	G60754101	455	6,054	SH		DFND	0,1	6,054	0	0
Microsoft Corp.	COM	594918104	39,277	845,584	SH		DFND	0,1	845,584	0	0
Mondelez International, Inc.,	CL A	609207105	265	7,297	SH		SOLE	1	7,297	0	0
Morgan Stanley	COM	617446448	36,447	939,346	SH		SOLE	0	939,346	0	0
Mylan, Inc.	COM	628530107	2,690	47,714	SH		SOLE	0	47,714	0	0
NIKE, Inc., Class B	CL B	654106103	20,810	216,437	SH		DFND	0,1	216,437	0	0
NN, Inc.	COM	629337106	3,430	166,844	SH		SOLE	0	166,844	0	0
National Oilwell Varco, Inc.	COM	637071101	14,765	225,322	SH		SOLE	0	225,322	0	0
Natus Medical, Inc.	COM	639050103	7,368	204,449	SH		SOLE	0	204,449	0	0
Newell Rubbermaid, Inc.	COM	651229106	26,830	704,387	SH		SOLE	0	704,387	0	0
Nordson Corp.	COM	655663102	14,568	186,868	SH		SOLE	0	186,868	0	0
Nucor Corp.	COM	670346105	14,081	287,077	SH		SOLE	0	287,077	0	0
ONE Gas, Inc.	COM	68235P108	10,526	255,365	SH		SOLE	0	255,365	0	0
ONEOK, Inc.	COM	682680103	12,224	245,506	SH		SOLE	0	245,506	0	0
Open Text Corp.	COM	683715106	4,773	81,925	SH		SOLE	0	81,925	0	0
Oracle Corp.	COM	68389x105	20,105	447,071	SH		DFND	0,1	447,071	0	0
Oshkosh Corp.	COM	688239201	3,123	64,200	SH		SOLE	0	64,200	0	0
PNC Financial Services Group,	COM	693475105	4,782	52,413	SH		SOLE	0	52,413	0	0
Pall Corp.	COM	696429307	15,844	156,542	SH		DFND	0,1	156,542	0	0
Pantry, Inc., The	COM	698657103	5,072	136,851	SH		SOLE	0	136,851	0	0
Peoples Federal Bancshares, In	COM	711037101	5,167	229,228	SH		SOLE	0	229,228	0	0
PepsiCo, Inc.	COM	713448108	25,261	267,145	SH		DFND	0,1	267,145	0	0
Physicians Realty Trust, REIT	COM	71943U104	2,905	175,000	SH		SOLE	0	175,000	0	0
Pioneer Natural Resources Co.	COM	723787107	4,479	30,089	SH		SOLE	0	30,089	0	0
Plantronics, Inc.	COM	727493108	1,817	34,265	SH		SOLE	0	34,265	0	0
Praxair, Inc.	COM	74005P104	2,765	21,338	SH		DFND	0,1	21,338	0	0
Priceline Group, Inc., The	COM	741503403	2,160	1,894	SH		SOLE	0	1,894	0	0
Procter & Gamble Co., The	COM	742718109	21,717	238,409	SH		DFND	0,1	238,409	0	0
QUALCOMM, Inc.	COM	747525103	4,070	54,762	SH		SOLE	0	54,762	0	0
Quanta Services, Inc.	COM	74762E102	16,595	584,554	SH		SOLE	0	584,554	0	0
Quintiles Transnational Holdin	COM	74876Y101	1,772	30,100	SH		SOLE	0	30,100	0	0
Red Hat, Inc.	COM	756577102	1,825	26,393	SH		SOLE	0	26,393	0	0
Roper Industries, Inc.	COM	776696106	2,398	15,336	SH		SOLE	0	15,336	0	0
Ryder System, Inc.	COM	783549108	17,281	186,119	SH		SOLE	0	186,119	0	0
SEI Investments Co.	COM	784117103	3,355	83,800	SH		SOLE	0	83,800	0	0
SS&C Technologies Holdings, In	COM	78467J100	3,845	65,733	SH		SOLE	0	65,733	0	0
Scripps Networks Interactive,	COM	811065101	3,320	44,111	SH		DFND	0,1	44,111	0	0
Sirona Dental Systems, Inc.	COM	82966C103	2,123	24,300	SH		SOLE	0	24,300	0	0
Sonus Networks, Inc.	COM	835916107	3,663	922,599	SH		SOLE	0	922,599	0	0
Stanley Black & Decker, Inc.	COM	854502101	3,766	39,199	SH		SOLE	0	39,199	0	0
Starbucks Corp.	COM	855244109	2,346	28,595	SH		SOLE	0	28,595	0	0
State Street Corp.	COM	857477103	3,536	45,045	SH		SOLE	0	45,045	0	0
Stericycle, Inc.	COM	858912108	22,972	175,250	SH		SOLE	0	175,250	0	0
SunPower Corp.	COM	867652406	1,968	76,179	SH		SOLE	0	76,179	0	0
Syntel, Inc.	COM	87162H103	3,291	73,174	SH		SOLE	0	73,174	0	0
T Mobile USA, Inc.	COM	872590104	1,455	54,000	SH		SOLE	0	54,000	0	0
T Rowe Price Group, Inc.	COM	74144T108	20,163	234,838	SH		SOLE	0	234,838	0	0
TJX Cos., Inc., The	COM	872540109	200	2,921	SH		SOLE	1	2,921	0	0
Tableau Software, Inc.	CL A	87336U105	1,352	15,951	SH		SOLE	0	15,951	0	0
Teradyne, Inc.	COM	880770102	2,647	133,769	SH		SOLE	0	133,769	0	0
Texas Instruments, Inc.	COM	882508104	3,183	59,540	SH		DFND	0,1	59,540	0	0
TheStreet, Inc.	COM	88368Q103	3,265	1,371,653	SH		SOLE	0	1,371,653	0	0
Thermo Fisher Scientific, Inc.	COM	883556102	3,763	30,034	SH		SOLE	0	30,034	0	0
Thermon Group Holdings, Inc.	COM	88362t103	966	39,934	SH		SOLE	0	39,934	0	0
TiVo, Inc.	COM	888706108	4,369	368,989	SH		SOLE	0	368,989	0	0
Time Warner, Inc.	COM	887317303	27,679	324,030	SH		SOLE	0	324,030	0	0
Trimble Navigation, Ltd.	COM	896239100	1,592	59,984	SH		SOLE	0	59,984	0	0
US Bancorp	COM	902973304	9,903	220,316	SH		SOLE	0	220,316	0	0
Ulta Salon Cosmetics & Fragran	COM	90384S303	450	3,520	SH		SOLE	1	3,520	0	0
Ultra Petroleum Corp.	COM	903914109	4,053	307,951	SH		SOLE	0	307,951	0	0
United Financial Bancorp., Inc	COM	910304104	5,875	409,152	SH		SOLE	0	409,152	0	0
United Parcel Service, Inc., C	CL B	911312106	3,829	34,443	SH		DFND	0,1	34,443	0	0
United Rentals, Inc.	COM	911363109	1,249	12,240	SH		SOLE	0	12,240	0	0
United Stationers, Inc.	COM	913004107	3,023	71,703	SH		SOLE	0	71,703	0	0
United Technologies Corp.	COM	913017109	412	3,583	SH		SOLE	1	3,583	0	0
UnitedHealth Group, Inc.	COM	91324p102	39,988	395,566	SH		SOLE	0	395,566	0	0
Unitil Corp.	COM	913259107	3,273	89,265	SH		SOLE	0	89,265	0	0
VF Corp.	COM	918204108	24,449	326,420	SH		DFND	0,1	326,420	0	0
Verint Systems, Inc.	COM	92343X100	2,156	37,000	SH		SOLE	0	37,000	0	0
Verizon Communications, Inc.	COM	92343V104	3,323	71,035	SH		DFND	0,1	71,035	0	0
Visa, Inc., Class A	CL A	92826C839	2,912	11,105	SH		DFND	0,1	11,105	0	0
Vodafone Group PLC, ADR	SPNSR ADR NO PAR	92857W308	1,076	31,500	SH		SOLE	0	31,500	0	0
Walt Disney Co., The	COM DISNEY	254687106	23,273	247,085	SH		DFND	0,1	247,085	0	0
Westell Technologies, Inc., Cl	CL A	957541105	1,876	1,250,986	SH		SOLE	0	1,250,986	0	0
Weyerhaeuser Co., REIT	COM	962166104	3,553	99,002	SH		DFND	0,1	99,002	0	0
Whirlpool Corp.	COM	963320106	2,408	12,429	SH		SOLE	0	12,429	0	0
Xerox Corp	COM	984121103	1,375	99,233	SH		SOLE	1	99,233	0	0
Xylem, Inc.	COM	98419M100	8,006	210,299	SH		SOLE	0	210,299	0	0
Zoetis, Inc.	CL A	98978V103	6,903	160,415	SH		SOLE	0	160,415	0	0
eBay, Inc.	COM	278642103	2,978	53,061	SH		SOLE	0	53,061	0	0
lululemon athletica, Inc.	COM	550021109	380	6,808	SH		SOLE	1	6,808	0	0
salesforce.com, inc.	COM	79466L302	3,345	56,406	SH		SOLE	0	56,406	0	0
ProShares UltraShort Euro	ULTRASHRT EURO	74347W882	2,161	100,000	SH		SOLE	0	100,000	0	0
SPDR S&P 500 ETF Trust	TR UNIT	78462f103	699	3,401	SH		SOLE	1	3,401	0	0
iShares MSCI EAFE ETF	MSCI EAFE ETF	464287465	253	4,156	SH		SOLE	1	4,156	0	0