13FBOX
Main Street Research LLC · 13F Holdings
Options Calculator Rankings

Main Street Research LLC

No.1679 Data as of 2026Q2
Latest AUM (Q2 2026)
$2.12B
QoQ Change Q1 2026
+$400.0M+23.3%
Holdings
140
New Buys
13
Adds
67
Reduces
51
Exits
21
Unchanged
9
Holdings Value Trend
Holdings by Sector
Stock Ownership TrendPortfolio %Prev Q %Q2 2026 ValueQ2 2026 SharesPrev Q ValuePrev Q SharesShares ChangeAction
NVIDIA CORPORATIONNVDA
5.95%6.3%$126.1M630,053$108.3M620,776+9,277+1.49%Add
MICRON TECHNOLOGY INCMU
5.92%2.14%$125.4M108,636$36.9M109,109-473-0.43%Reduce
APPLE INCAAPL
5.55%5.96%$117.5M406,129$102.4M403,578+2,551+0.63%Add
ALPHABET INCGOOGL
5.35%5.22%$113.3M316,947$89.7M311,786+5,161+1.66%Add
TAIWAN SEMICONDUCTOR MANUFACTSM
5.15%4.39%$109.1M228,429$75.4M223,159+5,270+2.36%Add
CORNING INCGLW
4.75%3.07%$100.7M394,058$52.7M387,718+6,340+1.64%Add
SSTATE STREET SPDR S&P BIOTECH ETFXBI
4.31%4.22%$91.3M576,754$72.5M567,479+9,275+1.63%Add
IISHARES INTERNATIONAL SMALLCAP EQUITY FACTOR ETFISCF
4.14%4.76%$87.8M2.0M$81.9M2.0M+68,729+3.51%Add
ASML HLDG NVASML
3.98%3.2%$84.3M42,396$55.1M41,687+709+1.70%Add
BROADCOM INCAVGO
3.81%3.83%$80.8M213,841$65.7M212,402+1,439+0.68%Add
JPMORGAN CHASE & COJPM
3.5%3.83%$74.1M226,299$65.8M223,762+2,537+1.13%Add
IISHARES MSCI SOUTH KOREAETFEWY
3.44%2.59%$72.9M360,865$44.5M361,874-1,009-0.28%Reduce
CATERPILLAR INCCAT
3.1%2.52%$65.8M61,759$43.3M61,110+649+1.06%Add
AMAZON COM INCAMZN
3.09%3.26%$65.5M274,738$56.1M269,193+5,545+2.06%Add
GE VERNOVA INCGEV
2.82%2.57%$59.7M50,802$44.2M50,692+110+0.22%Add
AMPHENOL CORPAPH
2.57%2.21%$54.4M308,716$38.0M301,043+7,673+2.55%Add
JOHNSON & JOHNSONJNJ
2.26%2.66%$47.9M188,640$45.7M186,882+1,758+0.94%Add
ROYAL BK CDA COMRY
2.22%2.1%$47.0M227,136$36.0M222,568+4,568+2.05%Add
COSTCO WHOLESALE CORPORATIONCOST
2.1%2.68%$44.4M47,497$46.0M46,139+1,358+2.94%Add
BHP BILLITON LIMITED SPONSORED ADSBHP
2.08%2.2%$44.0M528,051$37.8M519,212+8,839+1.70%Add
BARCLAYS PLCBCS
2.06%1.05%$43.6M1.6M$18.0M850,971+770,519+90.55%Add
META PLATFORMS INCMETA
1.92%2.36%$40.7M72,187$40.6M70,962+1,225+1.73%Add
KEYSIGHT TECHNOLOGIES INCKEYS
1.9%1.86%$40.3M115,108$31.9M112,937+2,171+1.92%Add
CAMECO CORPCCJ
1.88%2.46%$39.9M391,529$42.3M389,077+2,452+0.63%Add
WALMART INCWMT
1.86%2.49%$39.5M348,650$42.9M344,869+3,781+1.10%Add
ASTRAZENECA PLCAZN
1.77%2.19%$37.4M197,417$37.6M190,644+6,773+3.55%Add
ROSS STORES INC COMROST
1.51%$32.1M150,755$00+150,755New Buy
TECHNIPFMC PLC COMFTI
1.29%$27.4M413,657$00+413,657New Buy
MICROSOFT CORPMSFT
1.22%1.45%$25.8M69,182$25.0M67,542+1,640+2.43%Add
PROCTER & GAMBLE COPG
1.05%1.27%$22.2M151,073$21.9M151,627-554-0.37%Reduce
MCKESSON CORP COMMCK
1.02%3.41%$21.5M28,475$58.6M67,774-39,299-57.99%Reduce
FAIR ISAAC CORPFICO
0.54%0.53%$11.4M9,580$9.0M8,464+1,116+13.19%Add
AAlphabet Inc Class CGOOG
0.38%0.39%$8.0M22,707$6.7M23,437-730-3.11%Reduce
PALO ALTOPANW
0.38%0.32%$8.0M23,343$5.5M34,024-10,681-31.39%Reduce
BERKSHIRE HATHAWAY INC DELBRK.B
0.28%0.33%$6.0M11,980$5.7M11,978+2+0.02%Add
ARISTA NETWORKS INCANET
0.28%0.25%$5.9M34,937$4.3M34,981-44-0.13%Reduce
TESLA INCTSLA
0.26%0.27%$5.4M12,943$4.6M12,337+606+4.91%Add
SCHWAB CHARLES CORPSCHW
0.2%0.25%$4.2M45,887$4.4M46,360-473-1.02%Reduce
WELLS FARGO CO NEWWFC
0.19%0.22%$4.0M48,542$3.7M46,882+1,660+3.54%Add
BERKSHIRE HATHAWAY INC CL ABRK.A
0.18%0.21%$3.7M5$3.6M500.00%Unchanged
IISHARES TRIXUS
0.18%0.19%$3.7M39,073$3.3M38,583+490+1.27%Add
ELI LILLY & COLLY
0.16%0.16%$3.3M2,746$2.7M2,908-162-5.57%Reduce
VISA INCV
0.15%0.18%$3.2M9,369$3.1M10,246-877-8.56%Reduce
EXXON MOBIL CORPXOM
0.14%0.24%$3.1M22,437$4.1M23,924-1,487-6.22%Reduce
AUTODESK INCADSK
0.13%0.2%$2.8M14,240$3.4M14,403-163-1.13%Reduce
IISHARES INCURTH
0.13%0.15%$2.7M13,511$2.7M14,742-1,231-8.35%Reduce
CHEVRON CORPORATIONCVX
0.13%0.2%$2.7M16,080$3.5M16,851-771-4.58%Reduce
SSTATE STR SPDR S&P 500 ETF TSPY
0.12%0.12%$2.6M3,485$2.1M3,263+222+6.80%Add
ABBVIE INCABBV
0.12%0.13%$2.4M9,721$2.2M10,258-537-5.23%Reduce
MCDONALDS CORPMCD
0.11%0.28%$2.4M8,913$4.8M15,483-6,570-42.43%Reduce

🧭 Institutional Sector Flow Heatmap

Net Outflow Net Inflow