Foster Dykema Cabot & Co 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
SPDR Gold Trust	COM	78463V107	477	3,795	SH		SOLE		3,795	0	0
Sprott Physical Gold Trust Uni	COM	85207H104	851	79,197	SH		SOLE		79,197	0	0
Sprott Physical Silver Trust	COM	85207K107	89	14,670	SH		SOLE		14,670	0	0
Xtrackers MSCI All World ex US	COM	233051820	585	21,658	SH		SOLE		21,658	0	0
JPMorgan Hedged Equity Select	COM	46637K281	73,192	3,866,436	SH		SOLE		3,866,436	0	0
Tocqueville Gold Fund	COM	888894862	369	10,770	SH		SOLE		10,770	0	0
3M Company	COM	88579Y101	675	3,076	SH		SOLE		3,076	0	0
Abbott Laboratories	COM	002824100	691	11,535	SH		SOLE		11,535	0	0
AbbVie, Inc.	COM	00287y109	572	6,042	SH		SOLE		6,042	0	0
Air Products and Chemicals, In	COM	009158106	382	2,400	SH		SOLE		2,400	0	0
Alibaba Group Holding Ltd. Spo	COM	01609W102	215	1,170	SH		SOLE		1,170	0	0
Alphabet Inc. Class A	COM	02079K305	909	876	SH		SOLE		876	0	0
Alphabet Inc. Class C	COM	02079K107	1,624	1,574	SH		SOLE		1,574	0	0
Amazon.com, Inc.	COM	023135106	289	200	SH		SOLE		200	0	0
American Express Company	COM	025816109	969	10,392	SH		SOLE		10,392	0	0
Apple Inc.	COM	037833100	2,997	17,865	SH		SOLE		17,865	0	0
AT&T Inc.	COM	00206R102	620	17,401	SH		SOLE		17,401	0	0
Automatic Data Processing, Inc	COM	053015103	344	3,028	SH		SOLE		3,028	0	0
Becton Dickinson & Company	COM	075887109	8,923	41,179	SH		SOLE		41,179	0	0
Berkshire Hathaway, Inc. Cl. A	COM	084670108	18,544	62	SH		SOLE		62	0	0
Berkshire Hathaway, Inc. Cl. B	COM	084670702	22,398	112,280	SH		SOLE		112,280	0	0
BlackRock Inc.	COM	09247X101	5,129	9,468	SH		SOLE		9,468	0	0
Boeing Company	COM	097023105	17,580	53,618	SH		SOLE		53,618	0	0
Bristol-Myers Squibb Company	COM	110122108	670	10,595	SH		SOLE		10,595	0	0
Carnival Corporation	COM	143658300	4,600	70,140	SH		SOLE		70,140	0	0
Chevron Corporation	COM	166764100	267	2,340	SH		SOLE		2,340	0	0
Chubb Limited	COM	H1467J104	4,093	29,924	SH		SOLE		29,924	0	0
Cisco Systems, Inc.	COM	17275R102	759	17,702	SH		SOLE		17,702	0	0
Coca-Cola Company	COM	191216100	2,502	57,600	SH		SOLE		57,600	0	0
Colgate-Palmolive Company	COM	194162103	859	11,984	SH		SOLE		11,984	0	0
Donaldson Company, Inc.	COM	257651109	270	6,000	SH		SOLE		6,000	0	0
Eli Lilly and Company	COM	532457108	716	9,248	SH		SOLE		9,248	0	0
Enterprise Bancorp, Inc.	COM	293668109	1,105	31,306	SH		SOLE		31,306	0	0
Exxon Mobil Corporation	COM	30231G102	952	12,763	SH		SOLE		12,763	0	0
FedEx Corporation	COM	31428X106	213	886	SH		SOLE		886	0	0
General Electric Company	COM	369604103	671	49,763	SH		SOLE		49,763	0	0
Hershey Company	COM	427866108	247	2,495	SH		SOLE		2,495	0	0
Home Depot, Inc.	COM	437076102	848	4,757	SH		SOLE		4,757	0	0
IBM Corporation	COM	459200101	1,466	9,558	SH		SOLE		9,558	0	0
Illinois Tool Works Inc.	COM	452308109	908	5,796	SH		SOLE		5,796	0	0
Intel Corporation	COM	458140100	571	10,962	SH		SOLE		10,962	0	0
J. M. Smucker Company	COM	832696405	720	5,803	SH		SOLE		5,803	0	0
Johnson & Johnson	COM	478160104	2,236	17,449	SH		SOLE		17,449	0	0
Johnson Controls International	COM	G51502105	744	21,124	SH		SOLE		21,124	0	0
JPMorgan Chase & Co.	COM	46625H100	6,336	57,614	SH		SOLE		57,614	0	0
Laboratory Corporation of Amer	COM	50540R409	387	2,394	SH		SOLE		2,394	0	0
Lockheed Martin Corporation	COM	539830109	287	848	SH		SOLE		848	0	0
Loews Corporation	COM	540424108	448	9,000	SH		SOLE		9,000	0	0
McCormick & Co., Inc. Non-Voti	COM	579780206	851	8,000	SH		SOLE		8,000	0	0
McDonald's Corporation	COM	580135101	958	6,128	SH		SOLE		6,128	0	0
Merck & Co., Inc.	COM	58933y105	3,927	72,098	SH		SOLE		72,098	0	0
Microsoft Corporation	COM	594918104	12,500	136,953	SH		SOLE		136,953	0	0
Netflix, Inc.	COM	64110l106	298	1,010	SH		SOLE		1,010	0	0
Oracle Corporation	COM	68389X105	437	9,547	SH		SOLE		9,547	0	0
Pentair plc	COM	G7S00T104	4,640	68,102	SH		SOLE		68,102	0	0
PepsiCo, Inc.	COM	713448108	1,295	11,862	SH		SOLE		11,862	0	0
Pfizer Inc.	COM	717081103	712	20,070	SH		SOLE		20,070	0	0
Procter & Gamble Company	COM	742718109	52,654	664,157	SH		SOLE		664,157	0	0
Progressive Corporation	COM	743315103	374	6,132	SH		SOLE		6,132	0	0
Rayonier Inc.	COM	754907103	253	7,200	SH		SOLE		7,200	0	0
S&P Global, Inc.	COM	78409v104	1,863	9,750	SH		SOLE		9,750	0	0
Schlumberger NV	COM	806857108	4,257	65,715	SH		SOLE		65,715	0	0
ShotSpotter, Inc.	COM	82536T107	1,921	72,489	SH		SOLE		72,489	0	0
Stryker Corporation	COM	863667101	483	3,000	SH		SOLE		3,000	0	0
Union Pacific Corporation	COM	907818108	454	3,378	SH		SOLE		3,378	0	0
United Technologies Corporatio	COM	913017109	261	2,077	SH		SOLE		2,077	0	0
Visa Inc. Class A	COM	92826c839	10,794	90,233	SH		SOLE		90,233	0	0
Wal-Mart Stores, Inc.	COM	931142103	754	8,478	SH		SOLE		8,478	0	0
Walt Disney Company	COM	254687106	551	5,488	SH		SOLE		5,488	0	0
Wells Fargo & Company	COM	949746101	877	16,724	SH		SOLE		16,724	0	0
Columbia Emerging Markets Cons	COM	19762B509	437	16,521	SH		SOLE		16,521	0	0
iShares Core MSCI EAFE ETF	COM	46432F842	50,757	770,445	SH		SOLE		770,445	0	0
iShares Core MSCI Emerging Mar	COM	46434G103	6,597	112,964	SH		SOLE		112,964	0	0
iShares Core S&P Small Cap ETF	COM	464287804	14,518	188,524	SH		SOLE		188,524	0	0
iShares Edge MSCI Min Vol USA	COM	46429b697	23,018	443,260	SH		SOLE		443,260	0	0
iShares Edge MSCI USA Momentum	COM	46432F396	23,803	224,722	SH		SOLE		224,722	0	0
iShares Edge MSCI USA Quality	COM	46432f339	23,729	286,897	SH		SOLE		286,897	0	0
iShares MSCI ACWI ex U.S. ETF	COM	464288240	602	12,107	SH		SOLE		12,107	0	0
iShares MSCI Emerging Markets	COM	464287234	248	5,144	SH		SOLE		5,144	0	0
iShares MSCI USA ESG Select ET	COM	464288802	368	3,318	SH		SOLE		3,318	0	0
iShares Russell 1000 ETF	COM	464287622	806	5,485	SH		SOLE		5,485	0	0
iShares Russell 1000 Growth ET	COM	464287614	1,892	13,899	SH		SOLE		13,899	0	0
iShares Russell 1000 Value ETF	COM	464287598	1,482	12,358	SH		SOLE		12,358	0	0
iShares Russell 2000 ETF	COM	464287655	666	4,385	SH		SOLE		4,385	0	0
iShares Russell 2000 Growth In	COM	464287648	324	1,701	SH		SOLE		1,701	0	0
iShares Russell Midcap ETF	COM	464287499	1,061	5,138	SH		SOLE		5,138	0	0
iShares S&P 100 ETF	COM	464287101	455	3,919	SH		SOLE		3,919	0	0
iShares S&P 500 Growth ETF	COM	464287309	17,566	113,275	SH		SOLE		113,275	0	0
iShares Trust iShares MSCI Glo	COM	46435G532	953	16,185	SH		SOLE		16,185	0	0
PowerShares FTSE RAFI Develope	COM	73936T789	223	4,994	SH		SOLE		4,994	0	0
PowerShares FTSE RAFI US 1000	COM	73935x583	18,821	170,823	SH		SOLE		170,823	0	0
SPDR S&P 500 ETF Trust	COM	78462F103	86,360	328,176	SH		SOLE		328,176	0	0
Technology Select Sector SPDR	COM	81369Y803	1,905	29,125	SH		SOLE		29,125	0	0
Vanguard Dividend Appreciation	COM	921908844	530	5,241	SH		SOLE		5,241	0	0
Vanguard FTSE Developed Market	COM	921943858	2,351	53,126	SH		SOLE		53,126	0	0
Vanguard FTSE Emerging Markets	COM	922042858	935	19,893	SH		SOLE		19,893	0	0
Vanguard S&P 500 Index Fund	COM	922908363	2,595	10,720	SH		SOLE		10,720	0	0
Vanguard Total Stock Market In	COM	922908769	12,071	88,938	SH		SOLE		88,938	0	0