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	28,199	199,031	SH		SOLE	0	199,031	0	0
ASML Holding NV	NY REGISTRY SHS	N07059210	1,814	18,356	SH		SOLE	0	18,356	0	0
AT&T, Inc.	COM	00206R102	14,079	399,529	SH		DFND	0,1	399,529	0	0
Abbott Laboratories	COM	002824100	4,214	101,333	SH		SOLE	0	101,333	0	0
Abbvie, Inc.	COM	00287Y109	18,507	320,413	SH		SOLE	0	320,413	0	0
Aetna, Inc.	COM	00817Y108	1,110	13,705	SH		SOLE	1	13,705	0	0
Agilent Technologies, Inc.	COM	00846U101	2,727	47,867	SH		SOLE	0	47,867	0	0
Alexion Pharmaceuticals, Inc.	COM	015351109	1,653	9,969	SH		SOLE	0	9,969	0	0
Align Technology, Inc.	COM	016255101	1,344	26,000	SH		SOLE	0	26,000	0	0
Amazon.com, Inc.	COM	023135106	1,816	5,631	SH		SOLE	0	5,631	0	0
Amdocs, Ltd.	SHS	G02602103	16,694	363,865	SH		SOLE	0	363,865	0	0
American Express Co.	COM	025816109	28,929	330,469	SH		SOLE	0	330,469	0	0
American Tower Corp., REIT	COM	03027X100	22,546	240,797	SH		DFND	0,1	240,797	0	0
American Water Works Co., Inc.	COM	030420103	2,576	53,406	SH		SOLE	0	53,406	0	0
Apple, Inc.	COM	037833100	61,250	607,938	SH		SOLE	0	607,938	0	0
Ares Capital Corp.	COM	04010L103	1,131	70,000	SH		SOLE	0	70,000	0	0
Aruba Networks, Inc.	COM	043176106	1,083	50,182	SH		SOLE	0	50,182	0	0
AvalonBay Communities, Inc., R	COM	053484101	18,968	134,554	SH		SOLE	0	134,554	0	0
BJs Restaurants, Inc.	COM	09180C106	2,700	75,027	SH		SOLE	0	75,027	0	0
Baker Hughes, Inc.	COM	057224107	22,478	345,491	SH		SOLE	0	345,491	0	0
Bank of New York Mellon Corp.,	COM	064058100	23,322	602,166	SH		SOLE	0	602,166	0	0
Becton Dickinson & Co.	COM	075887109	32,344	284,195	SH		DFND	0,1	284,195	0	0
Biogen Idec, Inc.	COM	09062X103	1,963	5,935	SH		DFND	0,1	5,935	0	0
BlackRock, Inc.	COM	09247X101	36,988	112,658	SH		SOLE	0	112,658	0	0
BorgWarner, Inc.	COM	099724106	16,455	312,765	SH		SOLE	0	312,765	0	0
Bristol-Myers Squibb Co.	COM	110122108	2,398	46,861	SH		DFND	0,1	46,861	0	0
CBRE Group, Inc., Class A	CL A	12504L109	2,294	77,139	SH		SOLE	0	77,139	0	0
CSX Corp.	COM	126408103	15,223	474,843	SH		SOLE	0	474,843	0	0
Calavo Growers, Inc.	COM	128246105	754	16,713	SH		SOLE	0	16,713	0	0
Cantel Medical Corp.	COM	138098108	1,448	42,131	SH		SOLE	0	42,131	0	0
Cape Bancorp, Inc.	COM	139209100	1,266	134,303	SH		SOLE	0	134,303	0	0
Capitol Federal Financial, Inc	COM	14057j101	6,655	563,015	SH		SOLE	0	563,015	0	0
Celgene Corp.	COM	151020104	25,188	265,757	SH		SOLE	0	265,757	0	0
CenterPoint Energy, Inc.	COM	15189T107	11,553	472,135	SH		SOLE	0	472,135	0	0
Cinemark Holdings, Inc.	COM	17243V102	1,343	39,440	SH		SOLE	0	39,440	0	0
Cisco Systems, Inc.	COM	17275R102	479	19,024	SH		SOLE	1	19,024	0	0
Coca-Cola Co., The	COM	191216100	691	16,195	SH		SOLE	1	16,195	0	0
Cognizant Technology Solutions	CL A	192446102	14,356	320,672	SH		SOLE	0	320,672	0	0
Colgate-Palmolive Co.	COM	194162103	8,054	123,491	SH		DFND	0,1	123,491	0	0
ConocoPhillips	COM	20825C104	357	4,670	SH		SOLE	1	4,670	0	0
Cubist Pharmaceuticals, Inc.	COM	229678107	3,033	45,718	SH		SOLE	0	45,718	0	0
Cummins, Inc.	COM	231021106	12,565	95,203	SH		DFND	0,1	95,203	0	0
DISH Network Corp., Class A	CL A	25470M109	3,234	50,070	SH		SOLE	0	50,070	0	0
Delta Air Lines, Inc.	COM	247361702	11,404	315,457	SH		SOLE	0	315,457	0	0
DirecTV	COM	25490A309	10,132	117,106	SH		SOLE	0	117,106	0	0
Discover Financial Services	COM	254709108	19,022	295,422	SH		SOLE	0	295,422	0	0
EI du Pont de Nemours & Co.	COM	263534109	18,084	252,001	SH		DFND	0,1	252,001	0	0
EMC Corp.	COM	268648102	25,982	887,979	SH		SOLE	0	887,979	0	0
EQT Corp.	COM	26884L109	15,630	170,746	SH		SOLE	0	170,746	0	0
Eaton Corp PLC	SHS	G29183103	2,430	38,352	SH		SOLE	0	38,352	0	0
Eli Lilly & Co.	COM	532457108	232	3,573	SH		SOLE	1	3,573	0	0
Estee Lauder Cos, Inc., Class	CL A	518439104	22,410	299,917	SH		DFND	0,1	299,917	0	0
Evolving Systems, Inc.	COM	30049R209	1,759	192,085	SH		SOLE	0	192,085	0	0
Exactech, Inc.	COM	30064E109	2,346	102,474	SH		SOLE	0	102,474	0	0
Expeditors Int. of Washington,	COM	302130109	2,103	51,821	SH		SOLE	0	51,821	0	0
Express Scripts Holding Co.	COM	30219G108	2,364	33,471	SH		SOLE	0	33,471	0	0
FBR & Co.	COM	30247C400	4,863	176,690	SH		SOLE	0	176,690	0	0
Facebook, Inc., Class A	CL A	30303M102	1,955	24,736	SH		DFND	0,1	24,736	0	0
Factset Research Systems, Inc.	COM	303075105	3,646	30,000	SH		SOLE	0	30,000	0	0
Fox Chase Bancorp, Inc.	COM	35137T108	4,318	264,746	SH		SOLE	0	264,746	0	0
Frontier Communications Corp.	COM	35906A108	233	35,752	SH		SOLE	1	35,752	0	0
Gannett Co., Inc.	COM	364730101	2,961	99,796	SH		SOLE	0	99,796	0	0
General Electric Co.	COM	369604103	988	38,580	SH		SOLE	1	38,580	0	0
General Mills, Inc.	COM	370334104	2,995	59,356	SH		DFND	0,1	59,356	0	0
Gilead Sciences, Inc.	COM	375558103	28,121	264,172	SH		DFND	0,1	264,172	0	0
Goldman Sachs Group, Inc., The	COM	38141G104	12,409	67,598	SH		SOLE	0	67,598	0	0
Google, Inc., Class A	CL A	38259P508	26,838	45,611	SH		DFND	0,1	45,611	0	0
Google, Inc., Class C	CL C	38259P706	26,034	45,091	SH		DFND	0,1	45,091	0	0
HCP, Inc., REIT	COM	40414L109	19,337	486,947	SH		DFND	0,1	486,947	0	0
Hampden Bancorp, Inc.	COM	40867E107	1,243	72,336	SH		SOLE	0	72,336	0	0
Hess Corp.	COM	42809H107	29,000	307,459	SH		SOLE	0	307,459	0	0
Hewlett-Packard Co.	COM	428236103	344	9,701	SH		SOLE	1	9,701	0	0
Hologic, Inc.	COM	436440101	16,929	695,801	SH		DFND	0,1	695,801	0	0
Home Depot, Inc., The	COM	437076102	540	5,886	SH		SOLE	1	5,886	0	0
Honeywell International, Inc.	COM	438516106	356	3,820	SH		SOLE	1	3,820	0	0
IBM	COM	459200101	4,722	24,873	SH		DFND	0,1	24,873	0	0
Ingram Micro Inc., Class A	CL A	457153104	1,447	56,052	SH		SOLE	0	56,052	0	0
Innophos Holdings, Inc.	COM	45774N108	2,204	40,000	SH		SOLE	0	40,000	0	0
Intel Corp.	COM	458140100	25,993	746,503	SH		DFND	0,1	746,503	0	0
International Paper Co.	COM	460146103	17,804	372,946	SH		DFND	0,1	372,946	0	0
Intuit, Inc.	COM	461202103	2,691	30,699	SH		DFND	0,1	30,699	0	0
Jamba, Inc.	COM	47023A309	2,760	194,104	SH		SOLE	0	194,104	0	0
JetBlue Airways Corp.	COM	477143101	2,921	275,000	SH		SOLE	0	275,000	0	0
KeyCorp.	COM	493267108	1,046	78,447	SH		SOLE	1	78,447	0	0
Knoll, Inc.	COM	498904200	1,856	107,194	SH		SOLE	0	107,194	0	0
LaSalle Hotel Properties, REIT	COM SHS BEN INT	517942108	6,123	178,839	SH		SOLE	0	178,839	0	0
Laboratory Corp of America Hol	COM	50540R409	1,878	18,455	SH		SOLE	0	18,455	0	0
Laclede Group, Inc., The	COM	505597104	1,526	32,895	SH		SOLE	0	32,895	0	0
Landstar System, Inc.	COM	515098101	2,379	32,954	SH		SOLE	0	32,954	0	0
LinnCo LLC	COM SHS LTD INT	535782106	8,674	299,604	SH		SOLE	0	299,604	0	0
Lockheed Martin Corp.	COM	539830109	1,190	6,509	SH		SOLE	1	6,509	0	0
M&T Bank Corp.	COM	55261F104	12,100	98,141	SH		SOLE	0	98,141	0	0
Macy's, Inc.	COM	55616P104	2,654	45,613	SH		SOLE	0	45,613	0	0
Marriott International, Inc.,	CL A	571903202	3,467	49,595	SH		SOLE	0	49,595	0	0
MasterCard, Inc., Class A	CL A	57636Q104	2,608	35,275	SH		DFND	0,1	35,275	0	0
McDonald's Corp.	COM	580135101	342	3,605	SH		SOLE	1	3,605	0	0
Mead Johnson Nutrition Co.	COM	582839106	17,415	180,993	SH		DFND	0,1	180,993	0	0
Medtronic, Inc.	COM	585055106	229	3,699	SH		SOLE	1	3,699	0	0
Merck & Co., Inc.	COM	58933Y105	29,385	495,693	SH		SOLE	0	495,693	0	0
Michael Kors Holdings, Ltd.	SHS	G60754101	7,367	103,190	SH		SOLE	0	103,190	0	0
Microsoft Corp.	COM	594918104	37,640	811,898	SH		DFND	0,1	811,898	0	0
Mondelez International, Inc.,	CL A	609207105	709	20,706	SH		SOLE	1	20,706	0	0
Morgan Stanley	COM	617446448	32,452	938,739	SH		SOLE	0	938,739	0	0
Mylan, Inc.	COM	628530107	2,357	51,824	SH		SOLE	0	51,824	0	0
NIKE, Inc., Class B	CL B	654106103	5,295	59,366	SH		DFND	0,1	59,366	0	0
NN, Inc.	COM	629337106	2,884	107,946	SH		SOLE	0	107,946	0	0
NXP Semiconductor NV	COM	N6596X109	9,503	138,868	SH		SOLE	0	138,868	0	0
National Oilwell Varco, Inc.	COM	637071101	3,433	45,110	SH		SOLE	0	45,110	0	0
Natus Medical, Inc.	COM	639050103	5,738	194,449	SH		SOLE	0	194,449	0	0
Newell Rubbermaid, Inc.	COM	651229106	27,657	803,762	SH		SOLE	0	803,762	0	0
Noble Energy, Inc.	COM	655044105	12,295	179,858	SH		SOLE	0	179,858	0	0
Nordson Corp.	COM	655663102	14,214	186,852	SH		SOLE	0	186,852	0	0
Nuance Communications, Inc.	COM	67020Y100	1,207	78,275	SH		SOLE	0	78,275	0	0
Nucor Corp.	COM	670346105	2,383	43,893	SH		SOLE	0	43,893	0	0
ONE Gas, Inc.	COM	68235P108	8,746	255,371	SH		SOLE	0	255,371	0	0
ONEOK, Inc.	COM	682680103	16,750	255,524	SH		SOLE	0	255,524	0	0
Open Text Corp.	COM	683715106	4,468	80,625	SH		SOLE	0	80,625	0	0
Oracle Corp.	COM	68389x105	17,425	455,197	SH		DFND	0,1	455,197	0	0
PNC Financial Services Group,	COM	693475105	4,207	49,162	SH		SOLE	0	49,162	0	0
Pall Corp.	COM	696429307	2,633	31,459	SH		DFND	0,1	31,459	0	0
Pantry, Inc., The	COM	698657103	1,366	67,523	SH		SOLE	0	67,523	0	0
Peoples Federal Bancshares, In	COM	711037101	4,185	209,228	SH		SOLE	0	209,228	0	0
PepsiCo, Inc.	COM	713448108	24,679	265,105	SH		DFND	0,1	265,105	0	0
Phillips 66	COM	718546104	278	3,417	SH		SOLE	1	3,417	0	0
Physicians Realty Trust, REIT	COM	71943U104	2,744	200,000	SH		SOLE	0	200,000	0	0
Plantronics, Inc.	COM	727493108	2,832	59,265	SH		SOLE	0	59,265	0	0
Polycom, Inc.	COM	73172K104	4,077	331,839	SH		SOLE	0	331,839	0	0
Praxair, Inc.	COM	74005P104	2,289	17,745	SH		SOLE	0	17,745	0	0
Principal Financial Group, Inc	COM	74251V102	981	18,698	SH		SOLE	1	18,698	0	0
Procter & Gamble Co., The	COM	742718109	18,482	220,701	SH		DFND	0,1	220,701	0	0
Prudential Financial, Inc.	COM	744320102	15,118	171,914	SH		DFND	0,1	171,914	0	0
QUALCOMM, Inc.	COM	747525103	18,841	251,985	SH		DFND	0,1	251,985	0	0
Quanta Services, Inc.	COM	74762E102	20,104	553,972	SH		SOLE	0	553,972	0	0
Quintiles Transnational Holdin	COM	74876Y101	3,910	70,100	SH		SOLE	0	70,100	0	0
Realnetworks, Inc.	COM	75605L708	1,130	162,600	SH		SOLE	0	162,600	0	0
Red Hat, Inc.	COM	756577102	2,037	36,279	SH		SOLE	0	36,279	0	0
Roper Industries, Inc.	COM	776696106	2,703	18,477	SH		SOLE	0	18,477	0	0
Rosetta Resources, Inc.	COM	777779307	9,180	206,016	SH		SOLE	0	206,016	0	0
Ryder System, Inc.	COM	783549108	18,097	201,140	SH		SOLE	0	201,140	0	0
SAP SE, ADR	SPON ADR	803054204	1,289	17,858	SH		SOLE	0	17,858	0	0
SEI Investments Co.	COM	784117103	4,838	133,800	SH		SOLE	0	133,800	0	0
SS&C Technologies Holdings, In	COM	78467J100	1,805	41,122	SH		SOLE	0	41,122	0	0
Sanofi, ADR	SPON ADR	80105n105	10,457	185,308	SH		SOLE	0	185,308	0	0
Scripps Networks Interactive,	CL A COM	811065101	2,632	33,700	SH		DFND	0,1	33,700	0	0
Sonus Networks, Inc.	COM	835916107	2,813	822,599	SH		SOLE	0	822,599	0	0
Stanley Black & Decker, Inc.	COM	854502101	3,450	38,860	SH		SOLE	0	38,860	0	0
Starbucks Corp.	COM	855244109	1,929	25,569	SH		SOLE	0	25,569	0	0
State Street Corp.	COM	857477103	3,287	44,657	SH		SOLE	0	44,657	0	0
Stericycle, Inc.	COM	858912108	14,591	125,180	SH		SOLE	0	125,180	0	0
SunPower Corp.	COM	867652406	1,114	32,878	SH		SOLE	0	32,878	0	0
Teradyne, Inc.	COM	880770102	5,457	281,412	SH		SOLE	0	281,412	0	0
Texas Instruments, Inc.	COM	882508104	2,794	58,595	SH		DFND	0,1	58,595	0	0
TheStreet, Inc.	COM	88368Q103	2,648	1,182,109	SH		SOLE	0	1,182,109	0	0
Thermo Fisher Scientific, Inc.	COM	883556102	3,628	29,807	SH		SOLE	0	29,807	0	0
TiVo, Inc.	COM	888706108	4,977	388,989	SH		SOLE	0	388,989	0	0
Time Warner, Inc.	COM	887317303	22,039	293,039	SH		SOLE	0	293,039	0	0
Trimble Navigation, Ltd.	COM	896239100	2,019	66,187	SH		SOLE	0	66,187	0	0
US Bancorp	COM	902973304	9,497	227,031	SH		DFND	0,1	227,031	0	0
Ulta Salon Cosmetics & Fragran	COM	90384S303	416	3,520	SH		SOLE	1	3,520	0	0
Ultra Petroleum Corp.	COM	903914109	15,321	658,673	SH		SOLE	0	658,673	0	0
United Financial Bancorp., Inc	COM	910304104	4,240	334,152	SH		SOLE	0	334,152	0	0
United Parcel Service, Inc., C	CL B	911312106	3,122	31,764	SH		DFND	0,1	31,764	0	0
United Rentals, Inc.	COM	911363109	2,347	21,124	SH		SOLE	0	21,124	0	0
United Technologies Corp.	COM	913017109	438	4,151	SH		SOLE	1	4,151	0	0
UnitedHealth Group, Inc.	COM	91324p102	34,118	395,569	SH		SOLE	0	395,569	0	0
Unitil Corp.	COM	913259107	2,485	79,931	SH		SOLE	0	79,931	0	0
VF Corp.	COM	918204108	5,330	80,722	SH		DFND	0,1	80,722	0	0
Verizon Communications, Inc.	COM	92343V104	3,370	67,413	SH		DFND	0,1	67,413	0	0
Visa, Inc., Class A	COM CL A	92826C839	2,411	11,300	SH		DFND	0,1	11,300	0	0
Vodafone Group PLC, ADR	SPNSR ADR NO PAR	92857W308	1,027	31,234	SH		SOLE	0	31,234	0	0
Walt Disney Co., The	COM DISNEY	254687106	17,476	196,293	SH		DFND	0,1	196,293	0	0
Westell Technologies, Inc., Cl	CL A	957541105	2,302	1,250,986	SH		SOLE	0	1,250,986	0	0
Weyerhaeuser Co., REIT	COM	962166104	2,883	90,494	SH		DFND	0,1	90,494	0	0
Whirlpool Corp.	COM	963320106	1,388	9,529	SH		SOLE	0	9,529	0	0
Xerox Corp	COM	984121103	950	71,779	SH		SOLE	1	71,779	0	0
Xylem, Inc.	COM	98419M100	7,470	210,474	SH		SOLE	0	210,474	0	0
eBay, Inc.	COM	278642103	2,788	49,228	SH		SOLE	0	49,228	0	0
lululemon athletica, Inc.	COM	550021109	286	6,808	SH		SOLE	1	6,808	0	0
salesforce.com, inc.	COM	79466L302	2,510	43,637	SH		SOLE	0	43,637	0	0
SPDR S&P 500 ETF Trust	TR UNIT	78462f103	612	3,106	SH		SOLE	1	3,106	0	0
iShares MSCI EAFE ETF	MSCI EAFE ETF	464287465	371	5,781	SH		SOLE	1	5,781	0	0
iShares Silver Trust	ISHARES	46428Q109	5,264	321,969	SH		SOLE	0	321,969	0	0
iShares iBoxx $ High Yield Cor	iBOXX HI YD ETF	464288513	920	10,000	SH		SOLE	0	10,000	0	0
Equinix, Inc.	NOTE 3.000%10/1	29444UAG1	1,923	1,000,000	PRN		SOLE	0	1,000,000	0	0