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

OMB APPROVAL

OMB Number:		3235-0006
Expires:	Oct 31, 2018
Estimated average burden
hours per response:		23.8

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	428	3,795	SH		SOLE		3,795	0	0
Sprott Physical Gold Trust Uni	COM	85207H104	735	76,917	SH		SOLE		76,917	0	0
Sprott Physical Silver Trust	COM	85207K107	78	14,670	SH		SOLE		14,670	0	0
Xtrackers MSCI All World ex US	COM	233051820	601	21,658	SH		SOLE		21,658	0	0
JPMorgan Hedged Equity Select	COM	46637K281	75,904	3,768,832	SH		SOLE		3,768,832	0	0
Tocqueville Gold Fund	COM	888894862	301	10,124	SH		SOLE		10,124	0	0
3M Company	COM	88579Y101	645	3,060	SH		SOLE		3,060	0	0
Abbott Laboratories	COM	002824100	843	11,498	SH		SOLE		11,498	0	0
AbbVie, Inc.	COM	00287y109	564	5,963	SH		SOLE		5,963	0	0
Air Products and Chemicals, In	COM	009158106	401	2,400	SH		SOLE		2,400	0	0
Alphabet Inc. Class A	COM	02079K305	1,057	876	SH		SOLE		876	0	0
Alphabet Inc. Class C	COM	02079K107	1,932	1,619	SH		SOLE		1,619	0	0
Amazon.com, Inc.	COM	023135106	401	200	SH		SOLE		200	0	0
American Express Company	COM	025816109	1,046	9,821	SH		SOLE		9,821	0	0
Amphenol Corporation Class A	COM	032095101	4,525	48,128	SH		SOLE		48,128	0	0
Apple Inc.	COM	037833100	4,033	17,865	SH		SOLE		17,865	0	0
AT&T Inc.	COM	00206R102	489	14,563	SH		SOLE		14,563	0	0
Automatic Data Processing, Inc	COM	053015103	459	3,048	SH		SOLE		3,048	0	0
Becton Dickinson & Company	COM	075887109	10,778	41,294	SH		SOLE		41,294	0	0
Berkshire Hathaway, Inc. Cl. A	COM	084670108	18,240	57	SH		SOLE		57	0	0
Berkshire Hathaway, Inc. Cl. B	COM	084670702	23,913	111,683	SH		SOLE		111,683	0	0
BlackRock Inc.	COM	09247X101	4,608	9,776	SH		SOLE		9,776	0	0
Boeing Company	COM	097023105	20,214	54,354	SH		SOLE		54,354	0	0
Bristol-Myers Squibb Company	COM	110122108	658	10,595	SH		SOLE		10,595	0	0
Chevron Corporation	COM	166764100	286	2,340	SH		SOLE		2,340	0	0
Chubb Limited	COM	H1467J104	3,991	29,865	SH		SOLE		29,865	0	0
Cisco Systems, Inc.	COM	17275R102	865	17,776	SH		SOLE		17,776	0	0
Coca-Cola Company	COM	191216100	2,335	50,553	SH		SOLE		50,553	0	0
Colgate-Palmolive Company	COM	194162103	802	11,984	SH		SOLE		11,984	0	0
Donaldson Company, Inc.	COM	257651109	350	6,000	SH		SOLE		6,000	0	0
Eli Lilly and Company	COM	532457108	805	7,498	SH		SOLE		7,498	0	0
Enterprise Bancorp, Inc.	COM	293668109	1,077	31,306	SH		SOLE		31,306	0	0
Exxon Mobil Corporation	COM	30231G102	812	9,545	SH		SOLE		9,545	0	0
FedEx Corporation	COM	31428X106	213	886	SH		SOLE		886	0	0
General Electric Company	COM	369604103	425	37,602	SH		SOLE		37,602	0	0
Hershey Company	COM	427866108	254	2,488	SH		SOLE		2,488	0	0
Home Depot, Inc.	COM	437076102	985	4,757	SH		SOLE		4,757	0	0
IBM Corporation	COM	459200101	1,385	9,158	SH		SOLE		9,158	0	0
Illinois Tool Works Inc.	COM	452308109	818	5,796	SH		SOLE		5,796	0	0
Intel Corporation	COM	458140100	518	10,962	SH		SOLE		10,962	0	0
J. M. Smucker Company	COM	832696405	595	5,803	SH		SOLE		5,803	0	0
Johnson & Johnson	COM	478160104	2,175	15,739	SH		SOLE		15,739	0	0
Johnson Controls International	COM	G51502105	739	21,124	SH		SOLE		21,124	0	0
JPMorgan Chase & Co.	COM	46625H100	6,006	53,230	SH		SOLE		53,230	0	0
Laboratory Corporation of Amer	COM	50540R409	289	1,664	SH		SOLE		1,664	0	0
Lockheed Martin Corporation	COM	539830109	293	848	SH		SOLE		848	0	0
Loews Corporation	COM	540424108	301	6,000	SH		SOLE		6,000	0	0
McCormick & Co., Inc. Non-Voti	COM	579780206	1,054	8,000	SH		SOLE		8,000	0	0
McDonald's Corporation	COM	580135101	855	5,112	SH		SOLE		5,112	0	0
Merck & Co., Inc.	COM	58933y105	453	6,390	SH		SOLE		6,390	0	0
Microsoft Corporation	COM	594918104	15,380	134,473	SH		SOLE		134,473	0	0
MSCI Inc.	COM	55354G100	4,699	26,484	SH		SOLE		26,484	0	0
Netflix, Inc.	COM	64110l106	378	1,010	SH		SOLE		1,010	0	0
Oracle Corporation	COM	68389X105	236	4,585	SH		SOLE		4,585	0	0
PepsiCo, Inc.	COM	713448108	1,221	10,920	SH		SOLE		10,920	0	0
Pfizer Inc.	COM	717081103	872	19,795	SH		SOLE		19,795	0	0
Procter & Gamble Company	COM	742718109	53,978	648,535	SH		SOLE		648,535	0	0
Progressive Corporation	COM	743315103	436	6,132	SH		SOLE		6,132	0	0
S&P Global, Inc.	COM	78409v104	1,905	9,750	SH		SOLE		9,750	0	0
Schlumberger NV	COM	806857108	3,568	58,574	SH		SOLE		58,574	0	0
ShotSpotter, Inc.	COM	82536T107	878	14,320	SH		SOLE		14,320	0	0
Stryker Corporation	COM	863667101	533	3,000	SH		SOLE		3,000	0	0
Sysco Corporation	COM	871829107	226	3,090	SH		SOLE		3,090	0	0
Union Pacific Corporation	COM	907818108	550	3,378	SH		SOLE		3,378	0	0
United Technologies Corporatio	COM	913017109	292	2,090	SH		SOLE		2,090	0	0
Verizon Communications Inc.	COM	92343v104	219	4,098	SH		SOLE		4,098	0	0
Visa Inc. Class A	COM	92826c839	13,655	90,980	SH		SOLE		90,980	0	0
Wal-Mart Stores, Inc.	COM	931142103	727	7,737	SH		SOLE		7,737	0	0
Walt Disney Company	COM	254687106	635	5,428	SH		SOLE		5,428	0	0
Wells Fargo & Company	COM	949746101	604	11,491	SH		SOLE		11,491	0	0
Columbia Emerging Markets Cons	COM	19762B509	259	11,611	SH		SOLE		11,611	0	0
Invesco FTSE RAFI Developed Ma	COM	46138E743	215	4,962	SH		SOLE		4,962	0	0
Invesco FTSE RAFI US 1000 Port	COM	46137V613	19,937	167,866	SH		SOLE		167,866	0	0
iShares Core MSCI EAFE ETF	COM	46432F842	49,321	769,676	SH		SOLE		769,676	0	0
iShares Core S&P Small Cap ETF	COM	464287804	16,605	190,340	SH		SOLE		190,340	0	0
iShares Edge MSCI Min Vol USA	COM	46429b697	24,826	435,236	SH		SOLE		435,236	0	0
iShares Edge MSCI USA Momentum	COM	46432F396	26,621	223,702	SH		SOLE		223,702	0	0
iShares Edge MSCI USA Quality	COM	46432f339	25,805	285,550	SH		SOLE		285,550	0	0
iShares MSCI ACWI ex U.S. ETF	COM	464288240	577	12,107	SH		SOLE		12,107	0	0
iShares MSCI USA ESG Select ET	COM	464288802	364	3,051	SH		SOLE		3,051	0	0
iShares Russell 1000 ETF	COM	464287622	887	5,485	SH		SOLE		5,485	0	0
iShares Russell 1000 Growth ET	COM	464287614	2,168	13,899	SH		SOLE		13,899	0	0
iShares Russell 1000 Value ETF	COM	464287598	1,565	12,358	SH		SOLE		12,358	0	0
iShares Russell 2000 ETF	COM	464287655	570	3,380	SH		SOLE		3,380	0	0
iShares Russell 2000 Growth In	COM	464287648	366	1,701	SH		SOLE		1,701	0	0
iShares Russell Midcap ETF	COM	464287499	816	3,700	SH		SOLE		3,700	0	0
iShares S&P 100 ETF	COM	464287101	508	3,919	SH		SOLE		3,919	0	0
iShares S&P 500 Growth ETF	COM	464287309	26,498	149,565	SH		SOLE		149,565	0	0
iShares Trust iShares MSCI Glo	COM	46435G532	944	16,185	SH		SOLE		16,185	0	0
SPDR S&P 500 ETF Trust	COM	78462F103	96,182	330,842	SH		SOLE		330,842	0	0
Technology Select Sector SPDR	COM	81369Y803	2,113	28,044	SH		SOLE		28,044	0	0
Vanguard Dividend Appreciation	COM	921908844	476	4,302	SH		SOLE		4,302	0	0
Vanguard FTSE Developed Market	COM	921943858	1,711	39,549	SH		SOLE		39,549	0	0
Vanguard FTSE Emerging Markets	COM	922042858	617	15,051	SH		SOLE		15,051	0	0
Vanguard S&P 500 Index Fund	COM	922908363	2,070	7,753	SH		SOLE		7,753	0	0
Vanguard Total Stock Market In	COM	922908769	12,920	86,338	SH		SOLE		86,338	0	0