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	1,041	67,700	SH		SOLE		67,700	0	0
Sprott Physical Silver Trust	COM	85207K107	282	32,170	SH		SOLE		32,170	0	0
JPMorgan Hedged Equity Select	COM	46637K281	90,480	3,517,886	SH		SOLE		3,517,886	0	0
3M Company	COM	88579Y101	595	3,994	SH		SOLE		3,994	0	0
Abbott Laboratories	COM	002824100	497	4,202	SH		SOLE		4,202	0	0
AbbVie, Inc.	COM	00287y109	571	3,521	SH		SOLE		3,521	0	0
Accenture PLC	COM	G1151c101	19,779	58,651	SH		SOLE		58,651	0	0
Air Products and Chemicals, In	COM	009158106	426	1,705	SH		SOLE		1,705	0	0
Alphabet Inc. Class A	COM	02079K305	3,599	1,294	SH		SOLE		1,294	0	0
Alphabet Inc. Class C	COM	02079K107	5,407	1,936	SH		SOLE		1,936	0	0
Amazon.com, Inc.	COM	023135106	28,831	8,844	SH		SOLE		8,844	0	0
American Express Company	COM	025816109	30,228	161,647	SH		SOLE		161,647	0	0
Amphenol Corporation Class A	COM	032095101	23,565	312,743	SH		SOLE		312,743	0	0
Apple Inc	COM	037833100	17,986	103,008	SH		SOLE		103,008	0	0
Automatic Data Processing, Inc	COM	053015103	308	1,353	SH		SOLE		1,353	0	0
Baxter International Inc.	COM	071813109	239	3,084	SH		SOLE		3,084	0	0
Berkshire Hathaway, Inc. Cl. A	COM	084670108	2,645	5	SH		SOLE		5	0	0
Berkshire Hathaway, Inc. Cl. B	COM	084670702	28,823	81,672	SH		SOLE		81,672	0	0
BlackRock Inc.	COM	09247X101	422	552	SH		SOLE		552	0	0
Bristol-Myers Squibb Company	COM	110122108	627	8,580	SH		SOLE		8,580	0	0
Chubb Limited	COM	H1467J104	244	1,141	SH		SOLE		1,141	0	0
Cisco Systems, Inc.	COM	17275R102	414	7,424	SH		SOLE		7,424	0	0
Coca-Cola Company	COM	191216100	2,053	33,111	SH		SOLE		33,111	0	0
Colgate-Palmolive Company	COM	194162103	353	4,656	SH		SOLE		4,656	0	0
Costco Wholesale Corporation	COM	22160K105	27,707	48,115	SH		SOLE		48,115	0	0
Danaher Corp	COM	235851102	399	1,360	SH		SOLE		1,360	0	0
Eli Lilly and Company	COM	532457108	874	3,053	SH		SOLE		3,053	0	0
Enterprise Bancorp, Inc.	COM	293668109	1,256	31,306	SH		SOLE		31,306	0	0
Exxon Mobil Corporation	COM	30231G102	336	4,074	SH		SOLE		4,074	0	0
Heliogen Inc	COM	42329E105	3,945	750,000	SH		SOLE		750,000	0	0
Hershey Company	COM	427866108	279	1,288	SH		SOLE		1,288	0	0
Illinois Tool Works Inc.	COM	452308109	537	2,566	SH		SOLE		2,566	0	0
Intel Corporation	COM	458140100	406	8,200	SH		SOLE		8,200	0	0
Johnson & Johnson	COM	478160104	1,544	8,710	SH		SOLE		8,710	0	0
Johnson Controls International	COM	G51502105	469	7,158	SH		SOLE		7,158	0	0
JPMorgan Chase & Co.	COM	46625H100	21,536	157,978	SH		SOLE		157,978	0	0
Laboratory Corporation of Amer	COM	50540R409	348	1,321	SH		SOLE		1,321	0	0
Lockheed Martin Corporation	COM	539830109	616	1,396	SH		SOLE		1,396	0	0
Loews Corporation	COM	540424108	389	6,000	SH		SOLE		6,000	0	0
Lowes Cos. Inc.	COM	548661107	21,279	105,241	SH		SOLE		105,241	0	0
Luminar Technologies Inc Class	COM	550424105	3,780	241,874	SH		SOLE		241,874	0	0
McCormick & Co., Inc. Non-Voti	COM	579780206	406	4,066	SH		SOLE		4,066	0	0
McDonald's Corporation	COM	580135101	943	3,813	SH		SOLE		3,813	0	0
Merck & Co., Inc.	COM	58933y105	701	8,543	SH		SOLE		8,543	0	0
Microsoft Corporation	COM	594918104	25,478	82,638	SH		SOLE		82,638	0	0
Netflix, Inc.	COM	64110l106	595	1,588	SH		SOLE		1,588	0	0
NIKE, Inc. Class B	COM	654106103	16,068	119,411	SH		SOLE		119,411	0	0
PepsiCo, Inc.	COM	713448108	1,636	9,774	SH		SOLE		9,774	0	0
Pfizer Inc.	COM	717081103	651	12,570	SH		SOLE		12,570	0	0
Philip Morris International In	COM	718172109	252	2,685	SH		SOLE		2,685	0	0
Pioneer Natural Resources Comp	COM	723787107	250	1,000	SH		SOLE		1,000	0	0
Procter & Gamble Company	COM	742718109	6,396	41,858	SH		SOLE		41,858	0	0
Progressive Corporation	COM	743315103	413	3,624	SH		SOLE		3,624	0	0
Prologis Inc.	COM	74340W103	22,666	140,364	SH		SOLE		140,364	0	0
Qualcomm Inc.	COM	747525103	505	3,305	SH		SOLE		3,305	0	0
Raytheon Technologies Corporat	COM	75513E101	292	2,950	SH		SOLE		2,950	0	0
S&P Global, Inc.	COM	78409v104	697	1,700	SH		SOLE		1,700	0	0
Sherwin-Williams Co.	COM	824348106	16,907	67,729	SH		SOLE		67,729	0	0
Target Corp.	COM	87612E106	272	1,282	SH		SOLE		1,282	0	0
Tesla Motors, Inc.	COM	88160r101	350	325	SH		SOLE		325	0	0
Texas Instruments Inc.	COM	882508104	453	2,467	SH		SOLE		2,467	0	0
The Estee Lauder Cos Inc.	COM	518439104	7,744	28,438	SH		SOLE		28,438	0	0
Thermo Fisher Scientific Inc	COM	883556102	25,032	42,381	SH		SOLE		42,381	0	0
Union Pacific Corporation	COM	907818108	938	3,432	SH		SOLE		3,432	0	0
Visa Inc. Class A	COM	92826c839	211	952	SH		SOLE		952	0	0
Wal-Mart Stores, Inc.	COM	931142103	936	6,285	SH		SOLE		6,285	0	0
Walt Disney Company	COM	254687106	9,892	72,122	SH		SOLE		72,122	0	0
Zoetis, Inc. Class A	COM	98978V103	379	2,009	SH		SOLE		2,009	0	0
Financial Select Sector SPDR E	COM	81369Y605	20,445	533,529	SH		SOLE		533,529	0	0
Guggenheim S&P 500 Equal Weigh	COM	78355w106	945	5,995	SH		SOLE		5,995	0	0
Industrial Select Sector SPDR	COM	81369Y704	19,674	191,043	SH		SOLE		191,043	0	0
iShares Core MSCI EAFE ETF	COM	46432F842	60,024	863,534	SH		SOLE		863,534	0	0
iShares Core S&P 500 ETF	COM	464287200	1,224	2,697	SH		SOLE		2,697	0	0
iShares Core S&P Small Cap ETF	COM	464287804	361	3,350	SH		SOLE		3,350	0	0
iShares Edge MSCI Min Vol USA	COM	46429b697	1,560	20,110	SH		SOLE		20,110	0	0
iShares Edge MSCI USA Momentum	COM	46432F396	14,917	88,651	SH		SOLE		88,651	0	0
iShares Edge MSCI USA Quality	COM	46432f339	498	3,698	SH		SOLE		3,698	0	0
iShares MSCI Global Impact ETF	COM	46435G532	2,101	24,632	SH		SOLE		24,632	0	0
iShares Russell 1000 Growth ET	COM	464287614	4,535	16,335	SH		SOLE		16,335	0	0
iShares Russell 1000 Value ETF	COM	464287598	2,387	14,382	SH		SOLE		14,382	0	0
iShares Russell 2000 ETF	COM	464287655	463	2,258	SH		SOLE		2,258	0	0
iShares Russell Midcap ETF	COM	464287499	923	11,832	SH		SOLE		11,832	0	0
iShares S&P 500 Growth ETF	COM	464287309	2,278	29,823	SH		SOLE		29,823	0	0
KraneShares Global Carbon ETF	COM	500767678	499	10,695	SH		SOLE		10,695	0	0
SPDR MSCI EAFE Fossil Fuel Res	COM	78470E106	963	12,520	SH		SOLE		12,520	0	0
SPDR S&P 500 ETF Trust	COM	78462F103	181,547	401,973	SH		SOLE		401,973	0	0
SPDR S&P 500 Fossil Fuel Reser	COM	78468R796	3,494	31,471	SH		SOLE		31,471	0	0
SPDR S&P 600 Small Cap Value E	COM	78464A300	243	2,920	SH		SOLE		2,920	0	0
Technology Select Sector SPDR	COM	81369Y803	4,457	28,044	SH		SOLE		28,044	0	0
Vanguard Dividend Appreciation	COM	921908844	275	1,693	SH		SOLE		1,693	0	0
Vanguard FTSE Developed Market	COM	921943858	310	6,448	SH		SOLE		6,448	0	0
Vanguard S&P 500 Index Fund	COM	922908363	2,525	6,083	SH		SOLE		6,083	0	0
Vanguard Total International S	COM	921909768	271	4,540	SH		SOLE		4,540	0	0
Vanguard Total Stock Market In	COM	922908769	15,642	68,706	SH		SOLE		68,706	0	0
Vanguard Value Index Fund	COM	922908744	250	1,690	SH		SOLE		1,690	0	0