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MSR
Main Street Research Portfolio holdings
AUM
$2.12B
1-Year Est. Return
67.44%
This Fund
S&P 500
This Quarter
Est. Return
+4.75%
1 Year Est. Return
+67.44%
3 Year Est. Return
+232.37%
5 Year Est. Return
+381.46%
10 Year Est. Return
+1,630.85%
AUM
$1.75B
AUM Growth
-$103M
(-5.5%)
Cap. Flow
-$128M
Cap. Flow
% of AUM
-7.35%
Top 10 Holdings %
Top 10 Hldgs %
45.32%
Holding
146
New
17
Increased
25
Reduced
77
Closed
17
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P Biotech ETF
XBI
|
+$41.3M |
| 2 |
Johnson & Johnson
JNJ
|
+$33.2M |
| 3 |
AstraZeneca
AZN
|
+$32.6M |
| 4 |
iShares MSCI South Korea ETF
EWY
|
+$32.5M |
| 5 |
Caterpillar
CAT
|
+$31.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$45.1M |
| 2 |
T-Mobile US
TMUS
|
+$37.8M |
| 3 |
Mercado Libre
MELI
|
+$37M |
| 4 |
Spotify
SPOT
|
+$35.2M |
| 5 |
Trane Technologies
TT
|
+$32.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 35.88% |
| 2 | Financials | 16.32% |
| 3 | Communication Services | 9.11% |
| 4 | Healthcare | 7.73% |
| 5 | Consumer Staples | 6.59% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1
NVIDIA
NVDA
$4.72T
| $111M | 6.36% |
595,844
-5,714
| -0.9% | -$1.06M |
|
2
Alphabet (Google) Class A
GOOGL
$4.08T
| $93.1M | 5.33% |
297,544
-2,300
| -0.8% | -$657K |
|
3
Microsoft
MSFT
$3.35T
| $81.3M | 4.65% |
168,207
+43
| +0% | +$21.5K |
|
4
iShares International Small Cap Equity Factor ETF
ISCF
$662M
| $79.1M | 4.53% |
1,907,800
+412,800
| +28% | +$16.9M |
|
5
Apple
AAPL
$4.9T
| $79.1M | 4.52% |
290,937
-60,378
| -17% | -$16.2M |
|
6
Palantir
PLTR
$293B
| $78.3M | 4.48% |
440,250
-15,243
| -3% | -$2.76M |
|
7
JPMorgan Chase
JPM
$933B
| $71.5M | 4.09% |
221,919
-2,804
| -1% | -$868K |
|
8
Broadcom
AVGO
$1.85T
| $71.1M | 4.07% |
205,395
-3,031
| -1% | -$1.08M |
|
9
TSMC
TSM
$2.09T
| $66.5M | 3.8% |
218,147
-2,724
| -1% | -$799K |
|
10
Visa
V
$673B
| $61.1M | 3.49% |
174,088
-3,005
| -2% | -$1.02M |
|
11
Robinhood
HOOD
$77.7B
| $60.2M | 3.44% |
532,399
-6,906
| -1% | -$898K |
|
12
Amazon
AMZN
$2.53T
| $60M | 3.43% |
259,849
-3,085
| -1% | -$706K |
|
13
Meta Platforms (Facebook)
META
$1.37T
| $57.1M | 3.27% |
86,547
-2,636
| -3% | -$1.76M |
|
14
McKesson
MCK
$101B
| $55.3M | 3.16% |
67,361
-1,531
| -2% | -$1.25M |
|
15
Costco
COST
$423B
| $53.8M | 3.08% |
62,366
-1,093
| -2% | -$990K |
|
|
16
State Street SPDR S&P Biotech ETF
XBI
$10.3B
| $44M | 2.51% |
+360,526
| New | +$41.3M |
|
17
ASML
ASML
$634B
| $42.9M | 2.46% |
40,118
-316
| -0.8% | -$330K |
|
18
Barclays
BCS
$93.4B
| $42.8M | 2.45% |
1,682,837
-12,148
| -0.7% | -$269K |
|
19
Amphenol
APH
$197B
| $40M | 2.29% |
295,357
-1,954
| -0.7% | -$261K |
|
20
SPDR Gold MiniShares Trust
GLDM
$27.9B
| $39.5M | 2.26% |
462,316
-4,548
| -1% | -$374K |
|
21
Walmart Inc
WMT
$884B
| $37.8M | 2.16% |
338,395
-2,490
| -0.7% | -$267K |
|
|
22
Johnson & Johnson
JNJ
$617B
| $37.1M | 2.12% |
179,318
+167,933
| +1,475% | +$33.2M |
|
23
Uber
UBER
$143B
| $36.5M | 2.09% |
446,905
-5,915
| -1% | -$533K |
|
24
Cameco
CCJ
$38.4B
| $34.9M | 2% |
381,868
+17,476
| +5% | +$1.57M |
|
|
25
iShares MSCI South Korea ETF
EWY
$22.5B
| $34.6M | 1.98% |
+355,461
| New | +$32.5M |
|
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Main Street Research's Q4 2025 Portfolio in Review
As of Q4 2025, Main Street Research held 146 positions worth $1.75B, down 5.5% from $1.85B the previous quarter. Its ten largest holdings account for 45% of the portfolio.
Main Street Research withdrew a net $128M in Q4 2025, closing 17 positions and reducing 77 holdings. Its most notable exit was Mercado Libre, an estimated $37M position sold in full.
By sector, the portfolio is most concentrated in Technology at 36% of assets, up from 36% a quarter earlier, followed by Financials and Communication Services.
Against the trend, Main Street Research opened a new position in State Street SPDR S&P Biotech ETF worth $44M.
- Main Street Research's largest Q4 2025 buy was State Street SPDR S&P Biotech ETF: 360,526 shares worth $44M.
- Main Street Research added most to Johnson & Johnson in Q4 2025, an estimated $33.2M increase.
- Main Street Research's biggest Q4 2025 reduction was Netflix, cutting an estimated $45.1M.
- Main Street Research fully exited Mercado Libre in Q4 2025, selling an estimated $37M.
- Main Street Research's ten largest holdings make up 45% of its $1.75B portfolio in Q4 2025.
- Main Street Research opened 17 new positions and closed 17 in Q4 2025.
- Main Street Research's portfolio value fell 5.5% quarter-over-quarter to $1.75B.
Based on Main Street Research's 13F filing for Q4 2025, filed 9 Feb 2026.