WESTFIELD CAPITAL MANAGEMENT CO LP

WESTFIELD CAPITAL MANAGEMENT CO LP is based out of BOSTON, MA. Their last reported 13F filing for 2020-12-31 included $16,852,328,000 in managed 13F securities and a top 10 holdings concentration of 22.61%. WESTFIELD CAPITAL MANAGEMENT CO LP's largest holding is APPLE INC with shares held of 4,519,907 with total value $599,746,000. WESTFIELD CAPITAL MANAGEMENT CO LP has met the qualifications for inclusion in our system.

Quarter# of InvestmentsPortofolio Value (Million USD)
Current Quarter2020-12-3124716,852
Previous Quarter2020-09-3023515,448

New Buys


TickerNameSharesValueTotal Asset Value %
ABBVABBVIE INC 1,388,619$148,791,0000.88%
ESSESSEX PPTY TR INC 471,409$111,922,0000.66%
MSMORGAN STANLEY 1,545,505$105,913,0000.63%
SEAGEN INC 539,865$94,552,0000.56%
XLNXXILINX INC 545,622$77,353,0000.46%
CATCATERPILLAR INC 375,807$68,404,0000.41%
STSENSATA TECHNOLOGIES HLDG PL 1,173,214$61,875,0000.37%
ROKUROKU INC 185,524$61,598,0000.37%
HZNPHORIZON THERAPEUTICS PUB L 806,188$58,973,0000.35%
SYFSYNCHRONY FINANCIAL 1,625,976$56,438,0000.33%

Top Buys


TickerNameCurrent SharesCurrent ValuePrevious SharesPrevious ValueShares % ChangeValue % ChangePortfolio % Change
NTNXNUTANIX INC 1,636,106$52,143,00014,939$331,00010,851.91%15,653.17%0.31%
FGENFIBROGEN INC 591,464$21,937,000233,196$9,589,000153.63%128.77%0.07%
EYENATIONAL VISION HLDGS INC 2,558,631$115,880,0001,025,075$39,199,000149.60%195.62%0.43%
AZEK CO INC 1,647,300$63,339,000664,281$23,124,000147.98%173.91%0.23%
IEXIDEX CORP 488,445$97,298,000203,699$37,157,000139.79%161.86%0.34%
FFIVF5 NETWORKS INC 457,907$80,564,000209,891$25,768,000118.16%212.65%0.31%
NVDANVIDIA CORPORATION 177,519$92,700,00088,065$47,663,000101.58%94.49%0.24%
BRPBRP GROUP INC 687,093$20,592,000379,812$9,461,00080.90%117.65%0.06%
RNGRINGCENTRAL INC 208,152$78,883,000123,911$34,027,00067.99%131.82%0.25%
ITTITT INC 704,805$54,284,000450,903$26,626,00056.31%103.88%0.15%

Sold Out


TickerNamePrevious SharesPrevious Valueprevious Asset Value %
CHTRCHARTER COMMUNICATIONS INC N 207,701$129,676,0000.84%
ALGNALIGN TECHNOLOGY INC 390,861$127,952,0000.83%
DBXDROPBOX INC 3,987,158$76,793,0000.50%
SGENSEATTLE GENETICS INC 392,016$76,714,0000.50%
JBHTHUNT J B TRANS SVCS INC 529,107$66,869,0000.43%
MMCMARSH & MCLENNAN COS INC 565,558$64,870,0000.42%
CATCATERPILLAR INC DEL 421,316$62,839,0000.41%
STSENSATA TECHNOLOGIES HLDNG P 1,319,583$56,927,0000.37%
PCRXPACIRA BIOSCIENCES 912,775$54,876,0000.36%
KBHKB HOME 1,382,251$53,065,0000.34%

Top Sells


TickerNameCurrent SharesCurrent ValuePrevious SharesPrevious ValueShares % ChangeValue % ChangePortfolio % Change
TMUST-MOBILE US INC 8,019$1,081,000951,142$108,773,000-99.16%-99.01%-0.70%
AMTAMERICAN TOWER CORP NEW 19,115$4,291,000441,070$106,620,000-95.67%-95.98%-0.66%
PFPTPROOFPOINT INC 18,320$2,499,000381,391$40,256,000-95.20%-93.79%-0.25%
SBACSBA COMMUNICATIONS CORP NEW 13,570$3,829,000258,933$82,465,000-94.76%-95.36%-0.51%
LRCXLAM RESEARCH CORP 12,760$6,026,000140,693$46,675,000-90.93%-87.09%-0.27%
NXSTNEXSTAR MEDIA GROUP INC 25,560$2,791,000272,148$24,474,000-90.61%-88.60%-0.14%
LULULULULEMON ATHLETICA INC 12,431$4,326,000119,997$39,523,000-89.64%-89.05%-0.23%
FICOFAIR ISAAC CORP 14,691$7,508,000116,395$49,512,000-87.38%-84.84%-0.28%
MRKMERCK & CO. INC 10,469$856,00074,499$6,180,000-85.95%-86.15%-0.03%
PCTYPAYLOCITY HLDG CORP 18,840$3,879,000121,595$19,628,000-84.51%-80.24%-0.10%

2020-12-31 13F Holdings Details


Stock Sector Shares Held Market Value % of Portfolio Previous % of Portfolio Rank Change in Shares % Change in Shares
AAPL4,519,907$599,746,0003.56%3.87%1-647,886-12.54%
AMZN166,980$543,842,0003.23%3.72%2-15,519-8.50%
MSFT1,955,237$434,884,0002.58%2.92%3-192,133-8.95%
GOOGL213,566$374,304,0002.22%2.24%4-22,691-9.60%
ZEN2,264,009$324,025,0001.92%1.64%5-200,079-8.12%
FB1,098,068$299,948,0001.78%2.05%6-109,566-9.07%
ASND1,729,881$288,510,0001.71%1.79%7-59,893-3.35%
NOW447,303$246,209,0001.46%1.57%8-53,211-10.63%
TDG390,103$241,415,0001.43%1.16%914,0233.73%
BIO412,062$240,207,0001.43%0.99%10114,02938.26%
CRM976,318$217,260,0001.29%1.73%11-87,361-8.21%
GPN895,295$192,864,0001.14%0.94%1279,4469.74%
V864,745$189,146,0001.12%1.42%13-229,070-20.94%
PYPL806,596$188,905,0001.12%1.28%14-200,378-19.90%
AME1,495,250$180,836,0001.07%0.99%15-35,713-2.33%
HD669,542$177,844,0001.06%1.34%16-78,026-10.44%
TT1,215,586$176,454,0001.05%1.06%17-136,206-10.08%
NKE1,233,534$174,508,0001.04%1.10%18-117,555-8.70%
DRI1,399,729$166,736,0000.99%0.96%19-67,890-4.63%
TMO357,198$166,376,0000.99%1.22%20-68,286-16.05%
ICLR826,956$161,240,0000.96%1.03%21-2,922-0.35%
WMS1,904,882$159,210,0000.94%0.70%22167,0469.61%
FTNT1,063,502$157,962,0000.94%0.85%23-46,236-4.17%
VRTX652,910$154,309,0000.92%1.05%2456,4319.46%
AVGO347,094$151,975,0000.90%0.89%25-29,995-7.95%
AMAT1,753,803$151,353,0000.90%0.84%26-430,095-19.69%
ABBV1,388,619$148,791,0000.88%271,388,619New
TREX1,765,684$147,823,0000.88%0.82%28-10,185-0.57%
FIS1,021,956$144,566,0000.86%1.35%29-395,341-27.89%
SPLK837,767$142,328,0000.84%1.21%30-157,455-15.82%
WDAY575,851$137,980,0000.82%0.63%31125,97928.00%
HUBS345,625$137,020,0000.81%0.68%32-12,021-3.36%
QCOM895,559$136,429,0000.81%0.90%33-290,319-24.48%
BLD733,168$134,962,0000.80%0.95%34-130,898-15.15%
HUM327,615$134,411,0000.80%0.96%35-31,723-8.83%
BSX3,464,728$124,557,0000.74%0.74%36462,11515.39%
NICE434,868$123,302,0000.73%0.67%37-22,806-4.98%
UNP591,337$123,128,0000.73%0.82%38-51,960-8.08%
DGX1,026,288$122,303,0000.73%0.73%3941,4224.21%
LPLA1,162,967$121,204,0000.72%0.45%40263,84529.34%
MTD106,147$120,974,0000.72%0.87%41-33,711-24.10%
ROK480,509$120,516,0000.72%0.63%4242,4829.70%
IDXX239,444$119,691,0000.71%0.70%43-35,078-12.78%
STE617,569$117,054,0000.69%0.78%44-62,625-9.21%
EYE2,558,631$115,880,0000.69%0.25%451,533,556149.60%
BMY1,845,192$114,457,0000.68%0.80%46-200,784-9.81%
ESS471,409$111,922,0000.66%47471,409New
XLRN865,507$110,733,0000.66%0.62%4818,3582.17%
TWLO325,148$110,063,0000.65%0.56%49-22,265-6.41%
PODD425,894$108,871,0000.65%0.67%50-10,792-2.47%
ETSY601,451$107,004,0000.63%0.55%51-101,147-14.40%
MS1,545,505$105,913,0000.63%521,545,505New
TRU1,050,731$104,254,0000.62%0.52%5396,92210.16%
AJG831,100$102,815,0000.61%0.65%54-122,680-12.86%
TDY255,140$100,010,0000.59%0.65%55-70,394-21.62%
NCR2,648,189$99,492,0000.59%0.34%56305,41813.04%
BPMC868,067$97,354,0000.58%0.64%57-192,731-18.17%
IEX488,445$97,298,0000.58%0.24%58284,746139.79%
IRWD8,488,042$96,679,0000.57%0.40%591,641,85023.98%
FIVE551,036$96,420,0000.57%0.46%60-13,966-2.47%
COO264,028$95,927,0000.57%0.61%61-15,372-5.50%
539,865$94,552,0000.56%62539,865New
CMG67,318$93,351,0000.55%0.58%63-4,111-5.76%
NVDA177,519$92,700,0000.55%0.31%6489,454101.58%
ZNGA9,275,709$91,551,0000.54%0.45%651,613,27221.05%
ORLY199,675$90,367,0000.54%0.77%66-56,927-22.18%
RCKT1,594,981$87,469,0000.52%0.22%6796,4886.44%
SAIC918,554$86,932,0000.52%0.45%6835,5194.02%
WEX424,838$86,467,0000.51%0.39%69-13,016-2.97%
NFLX157,892$85,377,0000.51%0.58%70-22,701-12.57%
FLT311,451$84,973,0000.50%0.51%71-19,946-6.02%
FFIV457,907$80,564,0000.48%0.17%72248,016118.16%
DOOO1,218,882$80,422,0000.48%0.43%73-34,292-2.74%
LECO681,293$79,200,0000.47%0.42%74-20,105-2.87%
MCHP571,880$78,982,0000.47%0.45%75-109,427-16.06%
RNG208,152$78,883,0000.47%0.22%7684,24167.99%
ROST639,285$78,511,0000.47%0.41%77-34,633-5.14%
MSCI173,817$77,615,0000.46%0.36%7817,96611.53%
XLNX545,622$77,353,0000.46%79545,622New
TKR991,872$76,731,0000.46%0.36%80-36,485-3.55%
BMRN851,872$74,701,0000.44%0.31%81214,79233.72%
CRL293,626$73,365,0000.44%0.39%8224,2649.01%
SUI477,264$72,520,0000.43%0.55%83-123,787-20.60%
CSGP77,851$71,956,0000.43%0.45%84-3,408-4.19%
ULTA239,410$68,749,0000.41%0.37%85-17,035-6.64%
CAT375,807$68,404,0000.41%0.41%86-45,509-10.80%
MDB190,005$68,219,0000.40%0.30%87-10,297-5.14%
MASI237,443$63,725,0000.38%0.44%88-53,100-18.28%
1,647,300$63,339,0000.38%0.15%89983,019147.98%
HAE532,642$63,251,0000.38%0.48%90-309,769-36.77%
RP715,553$62,425,0000.37%0.27%91-11,000-1.51%
LITE657,883$62,367,0000.37%0.31%9225,9304.10%
CTSH759,790$62,265,0000.37%0.36%93-43,111-5.37%
TW996,056$62,204,0000.37%0.40%94-70,242-6.59%
SPGI188,543$61,980,0000.37%0.79%95-148,744-44.10%
ST1,173,214$61,875,0000.37%0.37%96-146,369-11.09%
CTLT594,314$61,850,0000.37%0.30%9758,93811.01%
ROKU185,524$61,598,0000.37%98185,524New
DXCM166,004$61,375,0000.36%0.45%99-2,514-1.49%
RPM670,173$60,838,0000.36%0.38%100-47,729-6.65%
TGT343,314$60,605,0000.36%0.60%101-247,713-41.91%
NXPI371,504$59,073,0000.35%0.32%102-22,188-5.64%
HZNP806,188$58,973,0000.35%103806,188New
NUAN1,313,826$57,927,0000.34%0.29%104-54,870-4.01%
BKI653,093$57,701,0000.34%0.37%105-9,766-1.47%
SYF1,625,976$56,438,0000.33%1061,625,976New
PCRX926,988$55,471,0000.33%0.36%10714,2131.56%
ITT704,805$54,284,0000.32%0.17%108253,90256.31%
AMED185,060$54,284,0000.32%0.27%1099,5415.44%
MU717,918$53,973,0000.32%110717,918New
SSNC741,244$53,926,0000.32%0.39%111-244,987-24.84%
CE414,661$53,881,0000.32%0.30%112-19,210-4.43%
SRC1,331,461$53,485,0000.32%1131,331,461New
NTNX1,636,106$52,143,0000.31%0.00%1141,621,16710,851.91%
ODFL265,879$51,894,0000.31%0.37%115-51,498-16.23%
EPRT2,340,469$49,618,0000.29%0.28%116-61,351-2.55%
ON1,513,001$49,521,0000.29%1171,513,001New
MKSI328,725$49,457,0000.29%0.21%11837,72912.97%
EPAY928,927$48,992,0000.29%0.20%119204,32228.20%
WSM478,076$48,687,0000.29%120478,076New
687,066$48,363,0000.29%121687,066New
TPTX390,967$47,639,0000.28%0.17%12288,34829.19%
SRPT279,328$47,623,0000.28%0.31%123-62,827-18.36%
PLAN652,941$46,914,0000.28%0.27%124-9,134-1.38%
FMC403,984$46,430,0000.28%0.28%125-5,385-1.32%
SIMO947,119$45,604,0000.27%0.16%126303,09347.06%
CHDN231,108$45,018,0000.27%0.26%127-10,310-4.27%
EXPE336,126$44,503,0000.26%0.21%128-17,656-4.99%
NBIX464,086$44,483,0000.26%0.25%12959,83514.80%
AEIS454,272$44,051,0000.26%0.21%130-58,338-11.38%
SAIA240,639$43,508,0000.26%0.21%131-10,980-4.36%
LAMR522,300$43,466,0000.26%0.23%132-21,285-3.92%
INSM1,278,676$42,567,0000.25%0.28%133-53,812-4.04%
BERY756,948$42,533,0000.25%0.25%134-30,655-3.89%
PANW114,162$40,572,0000.24%135114,162New
CDAY369,710$39,396,0000.23%0.20%136-6,230-1.66%
DHI568,338$39,170,0000.23%0.39%137-221,999-28.09%
MIME682,658$38,802,0000.23%0.22%138-27,285-3.84%
HEI327,464$38,333,0000.23%0.19%139-4,370-1.32%
MXL1,003,631$38,329,0000.23%0.10%140306,45243.96%
AVLR230,655$38,033,0000.23%0.19%141-3,292-1.41%
AYX312,060$38,006,0000.23%0.32%142-120,219-27.81%
BURL141,039$36,889,0000.22%0.27%143-63,046-30.89%
PLMR414,702$36,842,0000.22%0.32%144-58,510-12.36%
TNDM380,432$36,400,0000.22%0.18%145130,86252.43%
480,809$36,253,0000.22%0.13%14657,97013.71%
FRC246,383$36,201,0000.21%0.18%147-2,909-1.17%
AIZ263,391$35,879,0000.21%0.25%148-54,490-17.14%
STAY2,405,919$35,632,0000.21%0.19%149-29,085-1.19%
PRI263,612$35,306,0000.21%0.20%150-11,800-4.28%
HXL697,395$33,817,0000.20%151697,395New
RVLV1,066,316$33,237,0000.20%1521,066,316New
ITW162,263$33,082,0000.20%0.20%1531,0520.65%
SMAR461,760$31,995,0000.19%0.19%154-120,697-20.72%
MTOR1,139,580$31,806,0000.19%0.16%155-19,130-1.65%
SAGE353,603$30,590,0000.18%0.22%156-201,870-36.34%
IWO106,520$30,539,0000.18%157106,520New
868,409$30,360,0000.18%0.19%158-260,978-23.11%
CRUS362,321$29,783,0000.18%159362,321New
BL220,983$29,475,0000.17%0.13%160-9,785-4.24%
HHC364,842$28,797,0000.17%0.14%161-15,325-4.03%
CAKE773,533$28,667,0000.17%162773,533New
RPAY1,049,859$28,609,0000.17%0.18%163-114,410-9.83%
KLIC897,618$28,553,0000.17%164897,618New
CYBR169,994$27,469,0000.16%165169,994New
PSB202,745$26,939,0000.16%166202,745New
TWOU646,442$25,864,0000.15%0.15%167-27,675-4.11%
WCN252,080$25,856,0000.15%0.18%168-15,073-5.64%
TXRH320,421$25,044,0000.15%0.25%169-303,318-48.63%
WNS343,593$24,756,0000.15%0.18%170-95,301-21.71%
VIAV1,650,457$24,716,0000.15%0.26%171-1,813,321-52.35%
BBIO346,880$24,667,0000.15%172346,880New
KNSL115,936$23,202,0000.14%0.14%1733,2032.84%
MSA154,326$23,055,0000.14%0.14%174-6,740-4.18%
FGEN591,464$21,937,0000.13%0.06%175358,268153.63%
ACIW568,940$21,864,0000.13%0.10%176-25,825-4.34%
BRP687,093$20,592,0000.12%0.06%177307,28180.90%
HLNE263,771$20,587,0000.12%0.15%178-88,869-25.20%
CHNG1,027,856$19,170,0000.11%1791,027,856New
CHGG210,923$19,053,0000.11%0.10%180-2,495-1.17%
MSGS90,469$16,655,0000.10%0.06%18127,79544.35%
RGEN82,638$15,836,0000.09%0.08%182-3,365-3.91%
FATE159,639$14,516,0000.09%0.11%183-250,690-61.09%
AVY87,430$13,561,0000.08%0.07%18400.00%
ABT122,451$13,407,0000.08%0.09%185-235-0.19%
SITM114,014$12,762,0000.08%0.17%186-194,429-63.04%
MRSN462,378$12,304,0000.07%187462,378New
EIDX93,422$12,292,0000.07%0.08%188-145,760-60.94%
ORBC1,508,604$11,194,0000.07%1891,508,604New
814,803$11,065,0000.07%190814,803New
BDTX328,405$10,525,0000.06%191328,405New
INVA838,051$10,383,0000.06%192838,051New
ADTN698,986$10,324,0000.06%0.04%193142,52725.61%
WMT61,500$8,865,0000.05%0.06%19400.00%
GOOG4,950$8,672,0000.05%0.05%195-419-7.80%
CMCSA151,018$7,913,0000.05%0.05%196-610-0.40%
FICO14,691$7,508,0000.04%0.32%197-101,704-87.38%
DHR32,263$7,167,0000.04%0.04%198960.30%
ARE37,750$6,728,0000.04%0.04%19900.00%
JKHY40,929$6,630,0000.04%0.04%20000.00%
BFAM37,450$6,478,0000.04%0.04%20100.00%
PEP40,900$6,065,0000.04%0.04%20200.00%
LRCX12,760$6,026,0000.04%0.30%203-127,933-90.93%
C97,465$6,010,0000.04%0.03%2043,6803.92%
SBUX56,133$6,005,0000.04%0.05%205-31,863-36.21%
BLK7,735$5,581,0000.03%0.03%20600.00%
TROW36,785$5,569,0000.03%0.03%20700.00%
APO99,310$4,864,0000.03%0.02%20834,33552.84%
TSE86,720$4,441,0000.03%20986,720New
LULU12,431$4,326,0000.03%0.26%210-107,566-89.64%
AMT19,115$4,291,0000.03%0.69%211-421,955-95.67%
BBY40,125$4,004,0000.02%0.03%21200.00%
PCTY18,840$3,879,0000.02%0.13%213-102,755-84.51%
SBAC13,570$3,829,0000.02%0.53%214-245,363-94.76%
TDOC17,800$3,559,0000.02%0.03%21500.00%
MTN12,140$3,387,0000.02%0.02%21600.00%
RUSHA77,950$3,229,0000.02%0.02%21725,98350.00%
STZ13,418$2,939,0000.02%0.02%218-14-0.10%
NXST25,560$2,791,0000.02%0.16%219-246,588-90.61%
RJF26,730$2,557,0000.02%0.01%22000.00%
MRTN147,249$2,537,0000.02%0.02%22100.00%
PFPT18,320$2,499,0000.01%0.26%222-363,071-95.20%
IT14,370$2,302,0000.01%0.01%22300.00%
DIS8,936$1,619,0000.01%0.01%224-328-3.54%
IART22,980$1,492,0000.01%0.01%22500.00%
COST3,517$1,325,0000.01%0.01%226-1,269-26.51%
TEAM4,770$1,116,0000.01%0.00%22779019.85%
TMUS8,019$1,081,0000.01%0.70%228-943,123-99.16%
JNJ6,850$1,078,0000.01%2296,850New
CUTR42,680$1,029,0000.01%0.01%23000.00%
GDX24,130$869,0000.01%23124,130New
CSX9,530$865,0000.01%0.00%23200.00%
MRK10,469$856,0000.01%0.04%233-64,030-85.95%
SBNY5,940$804,0000.00%0.00%23400.00%
JPM6,300$801,0000.00%2356,300New
NSA16,500$594,0000.00%0.00%23600.00%
SLV21,990$540,0000.00%23721,990New
KAI3,740$527,0000.00%2383,740New
TRNO8,840$517,0000.00%0.00%23900.00%
PAGS9,010$512,0000.00%2409,010New
CASY2,730$488,0000.00%2412,730New
CMI2,140$486,0000.00%2422,140New
MCB12,700$461,0000.00%24312,700New
BIIB1,813$444,0000.00%0.00%244-19-1.04%
BABA1,893$441,0000.00%0.00%24500.00%
PCG26,200$326,0000.00%24626,200New
VTR4,442$218,0000.00%2474,442New
CHTR0.84%Sold All207,701-100%
ALGN0.83%Sold All390,861-100%
DBX0.50%Sold All3,987,158-100%
SGEN0.50%Sold All392,016-100%
JBHT0.43%Sold All529,107-100%
MMC0.42%Sold All565,558-100%
CAT0.41%Sold All421,316-100%
ST0.37%Sold All1,319,583-100%
PCRX0.36%Sold All912,775-100%
KBH0.34%Sold All1,382,251-100%
SQ0.31%Sold All298,983-100%
FMC0.28%Sold All409,369-100%
STOR0.22%Sold All1,247,937-100%
REXR0.21%Sold All712,509-100%
MYOK0.21%Sold All237,991-100%
UNF0.20%Sold All166,251-100%
ELS0.16%Sold All391,333-100%
GO0.12%Sold All486,069-100%
ENV0.12%Sold All241,658-100%
SKY0.12%Sold All674,411-100%
GBT0.08%Sold All217,850-100%
DIOD0.07%Sold All194,289-100%
FAF0.03%Sold All96,420-100%
STRA0.01%Sold All12,260-100%
FTAC0.00%Sold All58,170-100%
HLT0.00%Sold All6,003-100%
WWD0.00%Sold All6,020-100%
SIVB0.00%Sold All1,900-100%
ALB0.00%Sold All4,820-100%
DPZ0.00%Sold All930-100%
0.00%Sold All7,250-100%
0.00%Sold All9,200-100%
AGEN0.00%Sold All53,780-100%