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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
Cap. Flow
-$128M
Cap. Flow %
-7.35%
Top 10 Hldgs %
45.32%
Holding
146
New
17
Increased
25
Reduced
77
Closed
17

Top Buys

Rank Stock Value
1
XBI icon
State Street SPDR S&P Biotech ETF
XBI
+$41.3M
2
JNJ icon
Johnson & Johnson
JNJ
+$33.2M
3
AZN icon
AstraZeneca
AZN
+$32.6M
4
EWY icon
iShares MSCI South Korea ETF
EWY
+$32.5M
5
CAT icon
Caterpillar
CAT
+$31.4M

Top Sells

Rank Stock Value
1
NFLX icon
Netflix
NFLX
+$45.1M
2
TMUS icon
T-Mobile US
TMUS
+$37.8M
3
MELI icon
Mercado Libre
MELI
+$37M
4
SPOT icon
Spotify
SPOT
+$35.2M
5
TT icon
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
CVX icon
51
Chevron
CVX
$366B
$1.45M 0.08%
9,520
-7,281
-43% -$1.11M
MMM icon
52
3M
MMM
$93.9B
$1.29M 0.07%
8,059
-33
-0.4% -$5.4K
ISTB icon
53
iShares Core 1-5 Year USD Bond ETF
ISTB
$5.13B
$1.11M 0.06%
22,763
+1,535
+7% +$74.9K
RTX icon
54
RTX Corp
RTX
$300B
$1.01M 0.06%
5,496
-67
-1% -$11.6K
NFLX icon
55
Netflix
NFLX
$309B
$996K 0.06%
10,621
-418,599
-98% -$45.1M
CLX icon
56
Clorox
CLX
$12.8B
$920K 0.05%
9,125
-243
-3% -$26.4K
SCHI icon
57
Schwab 5-10 Year Corporate Bond ETF
SCHI
$11.5B
$884K 0.05%
38,493
+4,252
+12% +$98K
IVV icon
58
iShares Core S&P 500 ETF
IVV
$898B
$863K 0.05%
1,260
-190
-13% -$129K
QQQ icon
59
Invesco QQQ Trust
QQQ
$480B
$826K 0.05%
1,345
-250
-16% -$153K
MRK icon
60
Merck
MRK
$317B
$826K 0.05%
7,784
-1,486
-16% -$139K
IGLB icon
61
iShares 10+ Year Investment Grade Corporate Bond ETF
IGLB
$2.85B
$804K 0.05%
15,941
+1,776
+13% +$91.1K
BMY icon
62
Bristol-Myers Squibb
BMY
$130B
$789K 0.05%
14,620
-95
-0.6% -$4.57K
CSCO icon
63
Cisco
CSCO
$479B
$746K 0.04%
9,684
-788
-8% -$58.5K
AMD icon
64
Advanced Micro Devices
AMD
$786B
$733K 0.04%
3,422
-77
-2% -$17.3K
TMO icon
65
Thermo Fisher Scientific
TMO
$214B
$667K 0.04%
1,151
+155
+16% +$87.7K
SYK icon
66
Stryker
SYK
$129B
$649K 0.04%
1,843
+52
+3% +$18.9K
BAC icon
67
Bank of America
BAC
$442B
$611K 0.04%
11,118
-1,420
-11% -$75.1K
HSBC icon
68
HSBC
HSBC
$352B
$605K 0.03%
7,696
+338
+5% +$24.2K
ADP icon
69
Automatic Data Processing
ADP
$107B
$598K 0.03%
2,309
-169
-7% -$45K
ORCL icon
70
Oracle
ORCL
$416B
$591K 0.03%
3,031
-805
-21% -$192K
BSX icon
71
Boston Scientific
BSX
$69.2B
$574K 0.03%
6,023
-423
-7% -$41.5K
C icon
72
Citigroup
C
$231B
$553K 0.03%
4,740
-154
-3% -$16K
ACN icon
73
Accenture
ACN
$104B
$552K 0.03%
2,059
-425
-17% -$108K
NTES icon
74
NetEase
NTES
$82B
$550K 0.03%
4,000
-85
-2% -$12.1K
UNP icon
75
Union Pacific
UNP
$176B
$542K 0.03%
+2,342
New +$535K
1 2
3
4 5

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EF
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IVAV
Index Venture Associates VI St. Helier, Channel Islands, Jersey $2.11B AUM 13.76% 1-Year Est. Return
HJGA
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CF
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BWC
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SFS
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AAP
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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.