Main Street Research Portfolio holdings
Main Street Research is a wealth management firm that builds portfolios mainly from individual stocks and bonds around the world. Its founder, James E. Demmert, is chief investment officer and majority owner, and has written books on investing, including The Sustainable Endowment and Wall Street Lessons. Its Active Risk Management process places stop-loss orders on each security to limit losses in falling markets. Families and individuals get financial planning along with investment management, while foundations and institutions can also use the firm as an outside chief investment officer.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Ross Stores
ROST
|
+$33.9M |
| 2 |
TechnipFMC
FTI
|
+$29.3M |
| 3 |
Barclays
BCS
|
+$18.6M |
| 4 |
iShares International Small Cap Equity Factor ETF
ISCF
|
+$3.04M |
| 5 |
TSMC
TSM
|
+$2.14M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
SPDR Gold MiniShares Trust
GLDM
|
+$43.5M |
| 2 |
McKesson
MCK
|
+$31.2M |
| 3 |
Palantir
PLTR
|
+$21.3M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$7.53M |
| 5 |
Palo Alto Networks
PANW
|
+$2.44M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 42.89% |
| 2 | Miscellaneous | 12.86% |
| 3 | Financials | 9.02% |
| 4 | Communication Services | 7.71% |
| 5 | Industrials | 6.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
1
NVIDIA
NVDA
$4.94T
| $126M | 5.95% |
630,053
+9,277
| +1% | +$1.91M |
2019 Q4
26 quarters
|
|
2
Micron Technology
MU
$1T
| $125M | 5.92% |
108,636
-473
| -0.4% | -$355K |
2025 Q2
4 quarters
|
|
3
Apple
AAPL
$5.03T
| $118M | 5.55% |
406,129
+2,551
| +0.6% | +$730K |
2013 Q2
52 quarters
|
|
4
Alphabet (Google) Class A
GOOGL
$3.44T
| $113M | 5.35% |
316,947
+5,161
| +2% | +$1.86M |
2015 Q4
42 quarters
|
|
|
5
TSMC
TSM
$2.11T
| $109M | 5.15% |
228,429
+5,270
| +2% | +$2.14M |
2024 Q2
8 quarters
|
|
6
Corning
GLW
$106B
| $101M | 4.75% |
394,058
+6,340
| +2% | +$1.15M |
2026 Q1
1 quarter
|
|
7
State Street SPDR S&P Biotech ETF
XBI
$10.8B
| $91.3M | 4.31% |
576,754
+9,275
| +2% | +$1.25M |
2025 Q4
2 quarters
|
|
|
8
iShares International Small Cap Equity Factor ETF
ISCF
$700M
| $87.8M | 4.14% |
2,027,356
+68,729
| +4% | +$3.04M |
2025 Q3
3 quarters
|
|
9
ASML
ASML
$604B
| $84.3M | 3.98% |
42,396
+709
| +2% | +$1.13M |
2019 Q1
29 quarters
|
|
10
Broadcom
AVGO
$1.56T
| $80.8M | 3.81% |
213,841
+1,439
| +0.7% | +$577K |
2020 Q2
24 quarters
|
|
11
JPMorgan Chase
JPM
$895B
| $74.1M | 3.5% |
226,299
+2,537
| +1% | +$788K |
2023 Q2
12 quarters
|
|
12
iShares MSCI South Korea ETF
EWY
$22.4B
| $72.9M | 3.44% |
360,865
-1,009
| -0.3% | -$178K |
2025 Q4
2 quarters
|
|
13
Caterpillar
CAT
$286B
| $65.8M | 3.1% |
61,759
+649
| +1% | +$570K |
2020 Q2
24 quarters
|
|
14
Amazon
AMZN
$2.59T
| $65.5M | 3.09% |
274,738
+5,545
| +2% | +$1.39M |
2013 Q2
52 quarters
|
|
15
GE Vernova
GEV
$227B
| $59.7M | 2.82% |
50,802
+110
| +0.2% | +$112K |
2025 Q1
5 quarters
|
|
16
Amphenol
APH
$196B
| $54.4M | 2.57% |
617,432
+15,346
| +3% | +$1.11M |
2025 Q3
3 quarters
|
|
17
Johnson & Johnson
JNJ
$658B
| $47.9M | 2.26% |
188,640
+1,758
| +0.9% | +$410K |
2013 Q2
52 quarters
|
|
18
Royal Bank of Canada
RY
$281B
| $47M | 2.22% |
227,136
+4,568
| +2% | +$847K |
2026 Q1
1 quarter
|
|
19
Costco
COST
$449B
| $44.4M | 2.1% |
47,497
+1,358
| +3% | +$1.35M |
2013 Q2
52 quarters
|
|
20
BHP
BHP
$201B
| $44M | 2.08% |
528,051
+8,839
| +2% | +$734K |
2026 Q1
1 quarter
|
|
|
21
Barclays
BCS
$74.1B
| $43.6M | 2.06% |
1,621,490
+770,519
| +91% | +$18.6M |
2025 Q3
3 quarters
|
|
22
Meta Platforms (Facebook)
META
$1.6T
| $40.7M | 1.92% |
72,187
+1,225
| +2% | +$749K |
2023 Q2
12 quarters
|
|
23
Keysight
KEYS
$52.3B
| $40.3M | 1.9% |
115,108
+2,171
| +2% | +$740K |
2026 Q1
1 quarter
|
|
24
Cameco
CCJ
$33.5B
| $39.9M | 1.88% |
391,529
+2,452
| +0.6% | +$275K |
2025 Q3
3 quarters
|
|
25
Walmart Inc
WMT
$980B
| $39.5M | 1.86% |
348,650
+3,781
| +1% | +$469K |
2013 Q2
52 quarters
|
|
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Main Street Research's Q2 2026 Portfolio in Review
As of Q2 2026, Main Street Research held 161 positions worth $2.12B, up 23% from $1.72B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Main Street Research's Q2 2026 filing shows 13 new, 64 increased, 53 reduced and 21 closed positions. Its largest new stake was Ross Stores: 150,755 shares worth $32.1M. The largest sale was SPDR Gold MiniShares Trust, an estimated $43.5M.
By sector, the portfolio is most concentrated in Technology at 43% of assets, up from 38% a quarter earlier, followed by Miscellaneous and Financials.
- Main Street Research's largest Q2 2026 buy was Ross Stores: 150,755 shares worth $32.1M.
- Main Street Research added most to Barclays in Q2 2026, an estimated $18.6M increase.
- Main Street Research's biggest Q2 2026 reduction was McKesson, cutting an estimated $31.2M.
- Main Street Research fully exited SPDR Gold MiniShares Trust in Q2 2026, selling an estimated $43.5M.
- Main Street Research's ten largest holdings make up 49% of its $2.12B portfolio in Q2 2026.
- Main Street Research opened 13 new positions and closed 21 in Q2 2026.
- Main Street Research's portfolio value rose 23% quarter-over-quarter to $2.12B.
Based on Main Street Research's 13F filing for Q2 2026, filed 29 Jul 2026.