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
Sprott Physical Gold Trust Uni	COM	85207H104	1,003	71,480	SH		SOLE		71,480	0	0
Sprott Physical Silver Trust	COM	85207K107	299	32,170	SH		SOLE		32,170	0	0
JPMorgan Hedged Equity Select	COM	46637K281	87,894	3,383,127	SH		SOLE		3,383,127	0	0
3M Company	COM	88579Y101	494	2,486	SH		SOLE		2,486	0	0
Abbott Laboratories	COM	002824100	538	4,643	SH		SOLE		4,643	0	0
AbbVie, Inc.	COM	00287y109	448	3,980	SH		SOLE		3,980	0	0
Accenture PLC	COM	G1151c101	17,205	58,363	SH		SOLE		58,363	0	0
Air Products and Chemicals, In	COM	009158106	690	2,400	SH		SOLE		2,400	0	0
Alphabet Inc. Class A	COM	02079K305	2,745	1,124	SH		SOLE		1,124	0	0
Alphabet Inc. Class C	COM	02079K107	4,897	1,954	SH		SOLE		1,954	0	0
Amazon.com, Inc.	COM	023135106	20,964	6,094	SH		SOLE		6,094	0	0
American Express Company	COM	025816109	19,010	115,050	SH		SOLE		115,050	0	0
Amphenol Corporation Class A	COM	032095101	20,975	306,609	SH		SOLE		306,609	0	0
Apple Inc	COM	037833100	13,886	101,390	SH		SOLE		101,390	0	0
AT&T Inc.	COM	00206R102	210	7,302	SH		SOLE		7,302	0	0
Automatic Data Processing, Inc	COM	053015103	207	1,043	SH		SOLE		1,043	0	0
Becton Dickinson & Company	COM	075887109	12,642	51,983	SH		SOLE		51,983	0	0
Berkshire Hathaway, Inc. Cl. A	COM	084670108	3,767	9	SH		SOLE		9	0	0
Berkshire Hathaway, Inc. Cl. B	COM	084670702	23,505	84,576	SH		SOLE		84,576	0	0
BlackRock Inc.	COM	09247X101	494	565	SH		SOLE		565	0	0
Bristol-Myers Squibb Company	COM	110122108	692	10,357	SH		SOLE		10,357	0	0
Cisco Systems, Inc.	COM	17275R102	345	6,508	SH		SOLE		6,508	0	0
Coca-Cola Company	COM	191216100	2,146	39,653	SH		SOLE		39,653	0	0
Colgate-Palmolive Company	COM	194162103	881	10,834	SH		SOLE		10,834	0	0
Costco Wholesale Corporation	COM	22160K105	18,890	47,743	SH		SOLE		47,743	0	0
Danaher Corp	COM	235851102	365	1,360	SH		SOLE		1,360	0	0
Eli Lilly and Company	COM	532457108	409	1,784	SH		SOLE		1,784	0	0
Enterprise Bancorp, Inc.	COM	293668109	1,822	55,630	SH		SOLE		55,630	0	0
Exxon Mobil Corporation	COM	30231G102	272	4,310	SH		SOLE		4,310	0	0
General Electric Company	COM	369604301	207	15,379	SH		SOLE		15,379	0	0
Hershey Company	COM	427866108	269	1,545	SH		SOLE		1,545	0	0
IBM Corporation	COM	459200101	276	1,881	SH		SOLE		1,881	0	0
Illinois Tool Works Inc.	COM	452308109	574	2,566	SH		SOLE		2,566	0	0
Intel Corporation	COM	458140100	382	6,800	SH		SOLE		6,800	0	0
Johnson & Johnson	COM	478160104	1,871	11,358	SH		SOLE		11,358	0	0
Johnson Controls International	COM	G51502105	690	10,053	SH		SOLE		10,053	0	0
JPMorgan Chase & Co.	COM	46625H100	23,643	152,006	SH		SOLE		152,006	0	0
Laboratory Corporation of Amer	COM	50540R409	364	1,321	SH		SOLE		1,321	0	0
Lockheed Martin Corporation	COM	539830109	400	1,056	SH		SOLE		1,056	0	0
Loews Corporation	COM	540424108	328	6,000	SH		SOLE		6,000	0	0
Lowes Cos. Inc.	COM	548661107	20,804	107,256	SH		SOLE		107,256	0	0
Luminar Technologies Inc Class	COM	550424105	5,016	228,533	SH		SOLE		228,533	0	0
McCormick & Co., Inc. Non-Voti	COM	579780206	1,413	16,000	SH		SOLE		16,000	0	0
McDonald's Corporation	COM	580135101	776	3,361	SH		SOLE		3,361	0	0
Merck & Co., Inc.	COM	58933y105	661	8,496	SH		SOLE		8,496	0	0
Microsoft Corporation	COM	594918104	17,010	62,791	SH		SOLE		62,791	0	0
Netflix, Inc.	COM	64110l106	839	1,588	SH		SOLE		1,588	0	0
NIKE, Inc. Class B	COM	654106103	16,954	109,741	SH		SOLE		109,741	0	0
PepsiCo, Inc.	COM	713448108	1,336	9,016	SH		SOLE		9,016	0	0
Pfizer Inc.	COM	717081103	760	19,408	SH		SOLE		19,408	0	0
Procter & Gamble Company	COM	742718109	5,822	43,149	SH		SOLE		43,149	0	0
Progressive Corporation	COM	743315103	604	6,148	SH		SOLE		6,148	0	0
Prologis Inc.	COM	74340W103	16,945	141,763	SH		SOLE		141,763	0	0
S&P Global, Inc.	COM	78409v104	698	1,700	SH		SOLE		1,700	0	0
Sherwin-Williams Co.	COM	824348106	17,844	65,496	SH		SOLE		65,496	0	0
ShotSpotter, Inc.	COM	82536T107	518	10,622	SH		SOLE		10,622	0	0
Target Corp.	COM	87612E106	218	902	SH		SOLE		902	0	0
Tesla Motors, Inc.	COM	88160r101	221	325	SH		SOLE		325	0	0
Thermo Fisher Scientific Inc	COM	883556102	20,921	41,472	SH		SOLE		41,472	0	0
Union Pacific Corporation	COM	907818108	654	2,974	SH		SOLE		2,974	0	0
Vertex Pharmaceuticals Inc	COM	92532F100	219	1,086	SH		SOLE		1,086	0	0
View Inc	COM	92671V106	138	16,256	SH		SOLE		16,256	0	0
Visa Inc. Class A	COM	92826c839	20,950	89,598	SH		SOLE		89,598	0	0
Wal-Mart Stores, Inc.	COM	931142103	737	5,227	SH		SOLE		5,227	0	0
Walt Disney Company	COM	254687106	15,779	89,769	SH		SOLE		89,769	0	0
Siemens Gamesa Renewable Energ	ADR	82621P101	99	14,824	SH		SOLE		14,824	0	0
Columbia Emerging Markets Cons	COM	19762B509	255	9,033	SH		SOLE		9,033	0	0
Financial Select Sector SPDR E	COM	81369Y605	19,422	529,354	SH		SOLE		529,354	0	0
Industrial Select Sector SPDR	COM	81369Y704	18,810	183,695	SH		SOLE		183,695	0	0
iShares Core MSCI EAFE ETF	COM	46432F842	63,742	851,481	SH		SOLE		851,481	0	0
iShares Core MSCI Total Intern	COM	46432F834	232	3,167	SH		SOLE		3,167	0	0
iShares Core S&P 500 ETF	COM	464287200	1,159	2,697	SH		SOLE		2,697	0	0
iShares Core S&P Small Cap ETF	COM	464287804	249	2,208	SH		SOLE		2,208	0	0
iShares Edge MSCI Min Vol Emer	COM	464286533	253	3,940	SH		SOLE		3,940	0	0
iShares Edge MSCI Min Vol USA	COM	46429b697	15,246	207,113	SH		SOLE		207,113	0	0
iShares Edge MSCI USA Momentum	COM	46432F396	17,151	98,891	SH		SOLE		98,891	0	0
iShares Edge MSCI USA Quality	COM	46432f339	397	2,991	SH		SOLE		2,991	0	0
iShares MSCI EAFE ETF	COM	464287465	208	2,638	SH		SOLE		2,638	0	0
iShares MSCI Emerging Markets	COM	464287234	216	3,923	SH		SOLE		3,923	0	0
iShares MSCI Global Impact ETF	COM	46435G532	1,997	20,093	SH		SOLE		20,093	0	0
iShares Russell 1000 Growth ET	COM	464287614	4,514	16,629	SH		SOLE		16,629	0	0
iShares Russell 1000 Value ETF	COM	464287598	2,355	14,846	SH		SOLE		14,846	0	0
iShares Russell 2000 ETF	COM	464287655	715	3,119	SH		SOLE		3,119	0	0
iShares Russell Midcap ETF	COM	464287499	824	10,403	SH		SOLE		10,403	0	0
iShares S&P 500 Growth ETF	COM	464287309	2,100	28,876	SH		SOLE		28,876	0	0
SPDR S&P 500 ETF Trust	COM	78462F103	168,713	394,134	SH		SOLE		394,134	0	0
SPDR S&P 500 Fossil Fuel Reser	COM	78468R796	2,601	24,503	SH		SOLE		24,503	0	0
SPDR S&P Midcap 400 ETF Trust	COM	78467y107	246	500	SH		SOLE		500	0	0
Technology Select Sector SPDR	COM	81369Y803	4,141	28,044	SH		SOLE		28,044	0	0
Vanguard Dividend Appreciation	COM	921908844	301	1,946	SH		SOLE		1,946	0	0
Vanguard FTSE Developed Market	COM	921943858	1,090	21,165	SH		SOLE		21,165	0	0
Vanguard FTSE Emerging Markets	COM	922042858	487	8,966	SH		SOLE		8,966	0	0
Vanguard S&P 500 Index Fund	COM	922908363	2,428	6,170	SH		SOLE		6,170	0	0
Vanguard Total International S	COM	921909768	443	6,740	SH		SOLE		6,740	0	0
Vanguard Total Stock Market In	COM	922908769	15,929	71,488	SH		SOLE		71,488	0	0
Vanguard Value Index Fund	COM	922908744	232	1,690	SH		SOLE		1,690	0	0