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BI

Barton Investment Management

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$807M
Positions
58
Quarter ended
September 30, 2026
Filed
October 27, 2026

Reported portfolio value by quarter (54 quarters reported)

$1.22B $193M
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q3 26

$193M in Q2 2013 → $807M now. Hover for any quarter.

Holdings

As reported for the quarter ended September 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Shopify Inc 27.6% Trimmed 5.0% 1,501,272 $223M
Netflix Inc. 19.5% Trimmed 1.2% 2,257,376 $157M
Amazon Com Inc 14.7% Trimmed 2.5% 474,759 $118M
Okta Inc 5.3% Trimmed 3.9% 205,957 $43.1M
Global E Online Ltd 5.0% Trimmed 7.7% 1,005,523 $39.9M
Equinix Inc 3.9% Trimmed 2.8% 31,019 $31.4M
Gitlab Inc 3.4% Added 19% 573,679 $27.1M
Klaviyo Inc 2.6% Added 7.5% 1,350,490 $21.2M
Blue Owl Capital Inc 2.4% Added 0.2% 2,109,550 $19.2M
Gfl Environmental Inc 2.1% Trimmed 1.8% 408,082 $17.1M
Microsoft Corp 1.6% Added 1.6% 24,796 $12.7M
American Tower Corp 1.5% Trimmed 2.8% 74,912 $12.3M
Apple Inc 1.0% Trimmed 1.3% 24,532 $8.17M
BH Berkshire Hathaway Inc Del 0.9% Unchanged 10 $7.47M
Qualcomm Inc 0.9% Trimmed 0.2% 37,980 $6.99M
Alphabet Inc 0.8% Trimmed 0.6% 19,155 $6.59M
BH Berkshire Hathaway Cl B 0.6% Unchanged 10,255 $5.11M
Royalty Pharma PLC 0.6% Added 190% 87,029 $5.08M
PH Paypal Hldgs Inc 0.6% Trimmed 14% 85,692 $4.5M
Symbotic Inc 0.5% Added 75% 93,734 $3.94M
VI Vanguard Index Fds 0.5% Trimmed 4.9% 10,095 $3.78M
Johnson & Johnson 0.5% Trimmed 1.3% 13,976 $3.7M
Alphabet Inc 0.4% Unchanged 10,635 $3.62M
Blackline Inc 0.3% Trimmed 39% 77,185 $2.05M
IE Invesco Exch Traded Fd Tr Ii 0.2% Trimmed 2.7% 18,959 $2M
Abbvie Inc 0.2% Unchanged 7,578 $1.98M
VS Vanguard Scottsdale Fds 0.2% Added 6.7% 27,669 $1.59M
SS Schwab Strategic Tr 0.2% New 62,420 $1.49M
PT Price T Rowe Group Inc 0.2% Trimmed 2.8% 13,640 $1.42M
Exxonmobil Holdings Corp 0.2% New 8,105 $1.32M
Merck & Co Inc 0.1% Unchanged 8,158 $1.19M
Costco Wholesale Corporation 0.1% Unchanged 1,024 $932K
Nvidia Corporation 0.1% Added 1.9% 3,941 $900K
Oracle Corp 0.1% Unchanged 5,785 $794K
Abbott Laboratories 0.1% Unchanged 7,858 $777K
Adobe Inc 0.1% Unchanged 3,200 $768K
CS Cisco Sys Inc 0.1% Added 3.5% 5,260 $566K
SS State Str SPDR S&P 500 ETF T 0.1% Trimmed 13% 729 $556K
DW Disney Walt Co 0.1% Unchanged 5,289 $555K
SS Schwab Strategic Tr 0.1% Added 0.3% 16,890 $507K
Vertiv Holdings Co 0.1% Unchanged 1,980 $478K
Dell Technologies Inc 0.1% Unchanged 875 $471K
Meta Platforms Inc 0.1% Unchanged 629 $456K
American Express Co 0.1% Unchanged 1,460 $444K
Intel Corp 0.1% Trimmed 13% 3,385 $407K
Twilio Inc 0.0% Unchanged 1,315 $385K
AD Automatic Data Processing In 0.0% Unchanged 1,400 $361K
Advanced Micro Devices Inc 0.0% Trimmed 15% 565 $346K
Broadcom Inc 0.0% Unchanged 965 $339K
NT Northern Tr Corp 0.0% Trimmed 11% 2,001 $339K
Qxo Inc 0.0% Added 0.6% 27,670 $323K
Bill Holdings Inc 0.0% Trimmed 20% 7,482 $318K
Analog Devices Inc 0.0% Unchanged 735 $292K
AH Asml Hldg Nv 0.0% Unchanged 150 $272K
Pfizer Inc 0.0% Added 0.1% 9,495 $271K
VI Vanguard Index Fds 0.0% Unchanged 1,235 $267K
Walmart Inc 0.0% Unchanged 2,535 $263K
VE Vaneck ETF Trust 0.0% Unchanged 410 $250K

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q3 2026

quarter ended September 30, 2026 · filed October 27, 2026

Company Action Shares changed Value of change % of portfolio
Shopify Inc Trimmed −79,329 −$11.8M 27.6%
Electronic Arts Inc Exited −43,695 −$8.96M —
Gitlab Inc Added +93,223 +$4.4M 3.4%
Global E Online Ltd Trimmed −83,811 −$3.33M 5.0%
Royalty Pharma PLC Added +56,983 +$3.33M 0.6%
Amazon Com Inc Trimmed −12,073 −$3.01M 14.7%
Netflix Inc. Trimmed −26,279 −$1.83M 19.5%
Okta Inc Trimmed −8,302 −$1.74M 5.3%
Symbotic Inc Added +40,274 +$1.69M 0.5%
SS Schwab Strategic Tr New +62,420 +$1.49M 0.2%

Showing the 10 largest of 40 changes.

Q2 2026

quarter ended June 30, 2026 · filed July 20, 2026

Company Action Shares changed Value of change % of portfolio
AL Air Lease Corp Exited −340,033 −$22.1M —
Netflix Inc. Trimmed −59,307 −$4.23M 22.1%
Klaviyo Inc Added +206,556 +$3.12M 2.6%
Shopify Inc Trimmed −22,358 −$2.55M 24.4%
Amazon Com Inc Trimmed −10,406 −$2.48M 15.7%
Gitlab Inc Trimmed −74,487 −$2.27M 2.0%
Okta Inc Trimmed −12,317 −$1.68M 4.0%
Equinix Inc Trimmed −939 −$979K 4.5%
Blackline Inc Trimmed −32,667 −$917K 0.5%
Symbotic Inc Added +16,647 +$748K 0.3%

Showing the 10 largest of 38 changes.

Q1 2026

quarter ended March 31, 2026 · filed April 20, 2026

Company Action Shares changed Value of change % of portfolio
Klaviyo Inc Added +380,010 +$7.39M 2.6%
Shopify Inc Trimmed −37,467 −$4.44M 23.8%
AL Air Lease Corp Trimmed −63,213 −$4.11M 2.8%
Netflix Inc. Trimmed −28,755 −$2.76M 28.3%
Equinix Inc Trimmed −2,416 −$2.37M 4.0%
IE Invesco Exch Traded Fd Tr Ii New +20,430 +$2.16M 0.3%
Okta Inc Trimmed −24,310 −$1.91M 2.2%
Amazon Com Inc Trimmed −8,438 −$1.76M 13.0%
Qualcomm Inc Trimmed −10,281 −$1.32M 0.6%
Electronic Arts Inc Trimmed −5,370 −$1.09M 1.1%

Showing the 10 largest of 40 changes.

Q4 2025

quarter ended December 31, 2025 · filed January 21, 2026

Company Action Shares changed Value of change % of portfolio
Netflix Inc Added +2,129,406 +$200M 24.0%
Klaviyo Inc Added +275,053 +$8.93M 2.3%
Shopify Inc Trimmed −44,363 −$7.14M 28.5%
AL Air Lease Corp Trimmed −69,971 −$4.49M 2.8%
Amazon Com Inc Trimmed −7,011 −$1.62M 12.6%
Apple Inc Trimmed −2,927 −$796K 0.7%
Microsoft Corp Trimmed −1,314 −$635K 1.3%
Equinix Inc Trimmed −597 −$457K 2.9%
Blue Owl Capital Inc Added +29,980 +$448K 3.1%
PH Paypal Hldgs Inc Trimmed −6,954 −$406K 0.7%

Showing the 10 largest of 32 changes.

Q3 2025

quarter ended September 30, 2025 · filed October 21, 2025

Company Action Shares changed Value of change % of portfolio
Klaviyo Inc New +394,989 +$10.9M 1.1%
AL Air Lease Corp Trimmed −121,806 −$7.75M 3.1%
Shopify Inc Trimmed −33,577 −$4.99M 25.5%
Netflix Inc Trimmed −3,277 −$3.93M 29.6%
Symbotic Inc New +30,425 +$1.64M 0.2%
Equinix Inc Trimmed −1,809 −$1.42M 2.9%
Amazon Com Inc Trimmed −3,758 −$825K 11.5%
Blackline Inc Trimmed −12,160 −$646K 0.9%
PH Paypal Hldgs Inc Trimmed −7,139 −$479K 0.8%
SS Schwab Strategic Tr New +16,800 +$443K —

Showing the 10 largest of 26 changes.

Q2 2025

quarter ended June 30, 2025 · filed July 21, 2025

Company Action Shares changed Value of change % of portfolio
Gitlab Inc Added +124,930 +$5.64M 2.6%
Netflix Inc Trimmed −3,944 −$5.28M 34.1%
AL Air Lease Corp Trimmed −73,395 −$4.29M 3.6%
Blackline Inc Trimmed −48,977 −$2.77M 1.0%
Global E Online Ltd Added +42,610 +$1.43M 3.8%
Shopify Inc Trimmed −10,010 −$1.15M 20.5%
Amazon Com Inc Trimmed −3,452 −$757K 11.7%
Okta Inc Trimmed −6,586 −$658K 2.6%
AT American Tower Corp New Trimmed −2,830 −$625K 1.9%
Electronic Arts Inc Trimmed −3,785 −$604K 0.8%

Showing the 10 largest of 24 changes.

Q1 2025

quarter ended March 31, 2025 · filed April 11, 2025

Company Action Shares changed Value of change % of portfolio
Netflix Inc Trimmed −51,073 −$47.6M 28.6%
Amazon Com Inc Trimmed −78,929 −$15M 12.2%
Shopify Inc Trimmed −144,621 −$13.8M 20.3%
Gitlab Inc Added +103,605 +$4.87M 2.5%
Blackline Inc Trimmed −50,093 −$2.43M 1.3%
Blue Owl Capital Inc Added +76,575 +$1.53M 4.7%
VS Vanguard Scottsdale Fds New +24,919 +$1.46M 0.2%
Global E Online Ltd Added +34,080 +$1.21M 4.5%
PH Paypal Hldgs Inc Trimmed −9,815 −$640K 1.1%
Electronic Arts Inc Trimmed −4,295 −$621K 1.0%

Showing the 10 largest of 28 changes.

Q4 2024

quarter ended December 31, 2024 · filed January 27, 2025

Company Action Shares changed Value of change % of portfolio
Gitlab Inc Added +167,290 +$9.43M 2.0%
Blackline Inc Trimmed −129,754 −$7.88M 1.8%
Netflix Inc Trimmed −5,711 −$5.09M 28.4%
Shopify Inc Trimmed −22,140 −$2.35M 21.1%
Okta Inc Trimmed −21,894 −$1.73M 2.2%
VS Vanguard Scottsdale Fds Exited −23,469 −$1.39M —
Amazon Com Inc Trimmed −5,290 −$1.16M 13.9%
Electronic Arts Inc Trimmed −5,165 −$756K 0.9%
Apple Inc Trimmed −2,150 −$538K 0.8%
AL Air Lease Corp Trimmed −8,545 −$412K 3.5%

Showing the 10 largest of 30 changes.

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