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 COVER PAGE

OMB APPROVAL
OMB Number: 3235-0006
Expires: July 31, 2015
Estimated average burden
hours per response: 23.8

Report for the Calendar Year or Quarter Ended: 03-31-2021
Check here if Amendment   Amendment Number:
This Amendment (Check only one.):   is a restatement.
  adds new holdings entries.
Institutional Investment Manager Filing this Report:
Name: East Coast Asset Management, LLC.
Address: 16 Martin Street
Po Box 566
ESSEX , MA01929
Form 13F File Number: 028-15537

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:
Name: Jane Bolger
Title: Chief Compliance Officer
Phone: 978-801-0860
Signature, Place, and Date of Signing:
/s/ Jane Bolger Essex , MA 05-04-2021
[Signature] [City, State] [Date]
Report Type (Check only one.):
X 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)
  13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)
  13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)
Form 13F Summary Page
Report Summary:
Number of Other Included Managers: 0
Form 13F Information Table Entry Total: 62
Form 13F Information Table Value Total: 374,029
(thousands)
List of Other Managers Reporting for this Manager:
[If there are no entries in this list, omit this section.]
Form 13F File Number Name

List of Other Included Managers:
Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.
[If there are no entries in this list, state “NONE” and omit the column headings and list entries.]
No. Form 13F File Number Name


SEC FORM 13F-HR

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: July 31, 2015
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
3M CO COM 88579Y101 531 2,758 SH SOLE 2,758 0 0
ACCENTURE PLC IRELAND SHS CLASS A G1151C101 265 960 SH SOLE 960 0 0
ADOBE SYSTEMS INCORPORATED COM 00724F101 598 1,257 SH SOLE 1,257 0 0
ALPHABET INC CAP STK CL A 02079K305 707 343 SH SOLE 343 0 0
ALPHABET INC CAP STK CL C 02079K107 51,966 25,121 SH SOLE 25,121 0 0
AMAZON COM INC COM 023135106 25,201 8,145 SH SOLE 8,145 0 0
AMERICAN EXPRESS CO COM 025816109 204 1,442 SH SOLE 1,442 0 0
AMERICAN TOWER CORP NEW COM 03027X100 558 2,335 SH SOLE 2,335 0 0
AMGEN INC COM 031162100 485 1,950 SH SOLE 1,950 0 0
ANTHEM INC COM 036752103 282 785 SH SOLE 785 0 0
APPLE INC COM 037833100 5,445 44,576 SH SOLE 44,576 0 0
AUTOMATIC DATA PROCESSING IN COM 053015103 1,364 7,240 SH SOLE 7,240 0 0
BECTON DICKINSON & CO COM 075887109 2,149 8,838 SH SOLE 8,838 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 1,543 4 SH SOLE 4 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 40,410 158,179 SH SOLE 158,179 0 0
BROADRIDGE FINL SOLUTIONS IN COM 11133T103 857 5,596 SH SOLE 5,596 0 0
CHARTER COMMUNICATIONS INC N CL A 16119P108 36,192 58,656 SH SOLE 58,656 0 0
CLOROX CO DEL COM 189054109 398 2,065 SH SOLE 2,065 0 0
COLGATE PALMOLIVE CO COM 194162103 1,800 22,836 SH SOLE 22,836 0 0
COMCAST CORP NEW CL A 20030N101 1,043 19,267 SH SOLE 19,267 0 0
DANAHER CORPORATION COM 235851102 858 3,810 SH SOLE 3,810 0 0
DEERE & CO COM 244199105 4,335 11,586 SH SOLE 11,586 0 0
DISNEY WALT CO COM 254687106 570 3,090 SH SOLE 3,090 0 0
FACEBOOK INC CL A 30303M102 60,463 205,285 SH SOLE 205,285 0 0
FERRARI N V COM N3167Y103 325 1,552 SH SOLE 1,552 0 0
HOME DEPOT INC COM 437076102 422 1,384 SH SOLE 1,384 0 0
INTERNATIONAL BUSINESS MACHS COM 459200101 262 1,965 SH SOLE 1,965 0 0
INTUIT COM 461202103 230 600 SH SOLE 600 0 0
ISHARES INC MSCI SWITZERLAND 464286749 343 7,768 SH SOLE 7,768 0 0
ISHARES TR CORE S&P SCP ETF 464287804 213 1,958 SH SOLE 1,958 0 0
ISHARES TR GLOB HLTHCRE ETF 464287325 374 4,851 SH SOLE 4,851 0 0
ISHARES TR RUSSELL 2000 ETF 464287655 606 2,744 SH SOLE 2,744 0 0
ISHARES TR S&P 100 ETF 464287101 551 3,064 SH SOLE 3,064 0 0
JOHNSON & JOHNSON COM 478160104 1,197 7,282 SH SOLE 7,282 0 0
JPMORGAN CHASE & CO COM 46625H100 293 1,924 SH SOLE 1,924 0 0
LABORATORY CORP AMER HLDGS COM NEW 50540R409 1,255 4,921 SH SOLE 4,921 0 0
LIBERTY BROADBAND CORP COM SER C 530307305 17,514 116,641 SH SOLE 116,641 0 0
LOCKHEED MARTIN CORP COM 539830109 589 1,595 SH SOLE 1,595 0 0
MASTERCARD INCORPORATED CL A 57636Q104 10,280 28,872 SH SOLE 28,872 0 0
MICROSOFT CORP COM 594918104 2,439 10,344 SH SOLE 10,344 0 0
MOODYS CORP COM 615369105 5,153 17,258 SH SOLE 17,258 0 0
PAYCHEX INC COM 704326107 1,139 11,616 SH SOLE 11,616 0 0
PAYPAL HLDGS INC COM 70450Y103 328 1,351 SH SOLE 1,351 0 0
PEPSICO INC COM 713448108 346 2,443 SH SOLE 2,443 0 0
PFIZER INC COM 717081103 351 9,679 SH SOLE 9,679 0 0
PROCTER AND GAMBLE CO COM 742718109 577 4,260 SH SOLE 4,260 0 0
RAYTHEON TECHNOLOGIES CORP COM 75513E101 369 4,779 SH SOLE 4,779 0 0
REPUBLIC SVCS INC COM 760759100 218 2,193 SH SOLE 2,193 0 0
SCHWAB CHARLES CORP COM 808513105 3,438 52,743 SH SOLE 52,743 0 0
SNOWFLAKE INC CL A 833445109 314 1,370 SH SOLE 1,370 0 0
SPDR S&P 500 ETF TR TR UNIT 78462F103 2,518 6,353 SH SOLE 6,353 0 0
STARBUCKS CORP COM 855244109 2,389 21,865 SH SOLE 21,865 0 0
STELLANTIS N.V SHS N82405106 394 22,152 SH SOLE 22,152 0 0
SYSCO CORP COM 871829107 1,353 17,178 SH SOLE 17,178 0 0
TJX COS INC NEW COM 872540109 3,292 49,770 SH SOLE 49,770 0 0
TRANSDIGM GROUP INC COM 893641100 42,640 72,527 SH SOLE 72,527 0 0
UNION PAC CORP COM 907818108 1,829 8,299 SH SOLE 8,299 0 0
VANGUARD INDEX FDS MCAP VL IDXVIP 922908512 1,143 8,475 SH SOLE 8,475 0 0
VANGUARD INTL EQUITY INDEX F FTSE EMR MKT ETF 922042858 269 5,167 SH SOLE 5,167 0 0
VISA INC COM CL A 92826C839 3,502 16,542 SH SOLE 16,542 0 0
WASTE MGMT INC DEL COM 94106L109 3,650 28,292 SH SOLE 28,292 0 0
WOODWARD INC COM 980745103 23,700 196,471 SH SOLE 196,471 0 0