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Super Investors BLAIR WILLIAM & CO/IL
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BLAIR WILLIAM & CO/IL

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

Portfolio value
$38.4B
Positions
1998
Quarter ended
June 30, 2026
Filed
August 11, 2026

Reported portfolio value by quarter (53 quarters reported)

$66.9B $10.6B
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q2 26

$50.6B in Q2 2013 → $38.4B now. Hover for any quarter.

Holdings

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

Holding % of portfolio Activity Shares Value
Apple Inc 4.3% Trimmed 3.4% 5,731,525 $1.66B
Amazon Com Inc 3.6% Trimmed 3.0% 5,875,124 $1.4B
Microsoft Corp 3.3% Trimmed 1.6% 3,442,574 $1.28B
Nvidia Corporation 2.8% Trimmed 1.0% 5,374,424 $1.08B
Alphabet Inc 2.7% Trimmed 2.7% 2,953,724 $1.04B
Alphabet Inc 2.2% Trimmed 1.4% 2,402,621 $859M
Ge Vernova Inc 2.0% Trimmed 0.7% 659,673 $775M
Jpmorgan Chase & Co 1.9% Trimmed 1.6% 2,270,360 $743M
SS State Str SPDR S&P 500 ETF T 1.6% Added 0.3% 848,034 $633M
Visa Inc 1.6% Trimmed 0.2% 1,841,604 $632M
Costco Wholesale Corporation 1.3% Added 0.7% 524,692 $491M
IL Idexx Labs Inc 1.3% Trimmed 2.9% 918,556 $484M
Amphenol Corp 1.2% Trimmed 0.6% 2,504,409 $442M
Mastercard Incorporated 1.1% Trimmed 8.8% 842,350 $433M
IE Invesco Exchange Traded Fd T 1.1% Added 18% 1,982,392 $422M
Palo Alto Networks Inc 1.1% Trimmed 6.0% 1,226,519 $418M
EL Eli Lilly & Co 1.1% Added 7.1% 347,098 $416M
Meta Platforms Inc 1.0% Trimmed 7.0% 670,881 $378M
VI Vanguard Intl Equity Index F 1.0% Added 7.5% 4,479,218 $375M
Micron Technology Inc 0.9% Trimmed 4.9% 315,878 $365M
IT Ishares Tr 0.9% Trimmed 0.2% 484,704 $363M
Fastenal Co 0.9% Added 0.5% 7,407,059 $356M
Broadcom Inc 0.9% Added 1.2% 929,716 $351M
Abbvie Inc 0.8% Trimmed 3.5% 1,287,857 $324M
VT Vanguard Tax-managed Fds 0.8% Added 11% 4,291,023 $306M
Bwx Technologies Inc 0.8% Added 8.2% 1,556,417 $303M
VI Vanguard Index Fds 0.8% Added 5.5% 419,372 $288M
Arista Networks Inc 0.7% Added 39% 1,604,716 $273M
VI Vanguard Index Fds 0.7% Added 5.7% 1,232,497 $269M
IQ Invesco Qqq Tr 0.7% Added 15% 359,219 $265M
Walmart Inc 0.7% Trimmed 4.4% 2,270,879 $257M
Home Depot Inc 0.6% Trimmed 8.4% 697,590 $246M
Johnson & Johnson 0.6% Added 0.1% 956,262 $243M
BH Berkshire Hathaway Inc Del 0.6% Trimmed 2.4% 483,586 $242M
Everpure Inc 0.6% Added 4.5% 3,048,094 $240M
Ecolab Inc 0.6% Trimmed 1.4% 854,294 $238M
Watsco Inc 0.6% Trimmed 3.2% 564,024 $235M
American Express Co 0.6% Trimmed 1.9% 680,321 $230M
Progressive Corp 0.6% Trimmed 15% 1,034,104 $226M
Servicenow Inc 0.6% Added 24% 2,240,030 $222M
Transdigm Group Inc 0.6% Trimmed 0.8% 164,960 $220M
Stryker Corporation 0.6% Trimmed 19% 684,392 $215M
IT Ishares Tr 0.5% Added 12% 701,051 $211M
CH Crowdstrike Hldgs Inc 0.5% Added 7.9% 272,235 $208M
Uber Technologies Inc 0.5% Trimmed 15% 2,794,590 $202M
VI Vanguard Index Fds 0.5% Added 42% 528,525 $196M
Aaon Inc 0.5% Trimmed 5.5% 1,533,434 $195M
Boeing Co 0.5% Trimmed 4.7% 878,396 $190M
DD Danaher Corp Del 0.5% Trimmed 25% 971,095 $185M
Cintas Corp 0.5% Added 9.2% 1,063,530 $181M
VS Vanguard Specialized Funds 0.4% Added 4.5% 718,567 $170M
QS Quanta Svcs Inc 0.4% Trimmed 0.5% 224,665 $162M
Intuitive Surgical Inc 0.4% Trimmed 6.5% 397,640 $158M
Marvell Technology Inc 0.4% Trimmed 27% 530,549 $158M
IE Intercontinental Exchange In 0.4% Trimmed 19% 1,283,754 $158M
Goldman Sachs Group Inc 0.4% Trimmed 5.8% 147,217 $149M
Curtiss Wright Corp 0.4% Added 11% 185,609 $141M
Rockwell Automation Inc 0.4% Trimmed 0.6% 282,332 $140M
Rbc Bearings Inc 0.4% Trimmed 0.9% 215,880 $139M
IB International Business Machs 0.4% Trimmed 6.3% 486,008 $137M

Showing top 60 of 1998 positions.

Timeline of changes

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

Q2 2026

quarter ended June 30, 2026 · filed August 11, 2026

Company Action Shares changed Value of change % of portfolio
Exxon Mobil Corp Exited −946,386 −$161M —
VI Vanguard Index Fds Added +1,276,220 +$110M 0.3%
HI Honeywell Intl Inc New +454,384 +$102M 0.3%
HA Honeywell Aerospace Inc New +454,071 +$100M 0.3%
IT Ishares Tr Added +707,575 +$87.9M 0.3%
Kla Corp Added +256,312 +$77.3M 0.2%
Arista Networks Inc Added +453,489 +$77M 0.7%
HI Honeywell Intl Inc Exited −295,831 −$66.9M —
IE Invesco Exchange Traded Fd T Added +301,788 +$64.2M 1.1%
DD Danaher Corp Del Trimmed −325,709 −$62M 0.5%

Showing the 10 largest of 1858 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 08, 2026

Company Action Shares changed Value of change % of portfolio
IE Invesco Exchange Traded Fd T Added +1,130,618 +$217M 0.9%
VI Vanguard Intl Equity Index F Added +1,457,190 +$109M 0.9%
QS Quanta Svcs Inc Added +145,549 +$79.9M 0.4%
CA Clearwater Analytics Hldgs I Trimmed −3,295,378 −$77.9M —
Workday Inc Trimmed −574,666 −$74.7M 0.1%
Tyler Technologies Inc Trimmed −185,480 −$63.5M 0.2%
Applovin Corp Trimmed −154,488 −$61.5M 0.2%
Uber Technologies Inc Trimmed −807,962 −$58.1M 0.7%
SG SPDR Gold Tr Added +131,532 +$56.6M 0.5%
Procore Technologies Inc Trimmed −967,748 −$55.2M —

Showing the 10 largest of 1799 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 17, 2026

Company Action Shares changed Value of change % of portfolio
Servicenow Inc Added +1,815,759 +$278M 0.9%
Netflix Inc Added +1,346,463 +$126M 0.4%
Fiserv Inc Trimmed −1,366,438 −$91.8M 0.1%
CA Clearwater Analytics Hldgs I Trimmed −3,761,687 −$90.7M 0.2%
Costar Group Inc Trimmed −1,104,950 −$74.3M 0.4%
Zoetis Inc Trimmed −393,192 −$49.5M 0.3%
Pool Corp Trimmed −207,737 −$47.5M —
Bwx Technologies Inc Added +248,598 +$43M 0.7%
Watsco Inc Trimmed −124,516 −$42M 0.6%
Meta Platforms Inc Added +57,345 +$37.9M 1.3%

Showing the 10 largest of 1735 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 12, 2025

Company Action Shares changed Value of change % of portfolio
Applovin Corp Added +163,210 +$117M 0.6%
Cyberark Software Ltd Trimmed −164,657 −$79.6M —
Meta Platforms Inc Added +102,259 +$75.1M 1.3%
Servicenow Inc Added +71,293 +$65.6M 1.0%
Adobe Inc Trimmed −172,058 −$60.7M 0.4%
CA Clearwater Analytics Hldgs I Added +3,245,986 +$58.5M 0.3%
Microsoft Corp Trimmed −89,598 −$46.4M 5.0%
Workday Inc Trimmed −184,186 −$44.3M 0.6%
Aaon Inc Trimmed −460,778 −$43.1M 0.5%
Pool Corp Trimmed −133,013 −$41.2M 0.2%

Showing the 10 largest of 1651 changes.

Q2 2025

quarter ended June 30, 2025 · filed July 24, 2025

Company Action Shares changed Value of change % of portfolio
Fastenal Co Added +3,530,339 +$148M 0.8%
Ge Vernova Inc Added +279,604 +$148M 0.9%
Block Inc Trimmed −1,364,093 −$92.7M 0.1%
OA Oreilly Automotive Inc Added +1,006,559 +$90.7M 0.3%
IT Ishares Tr Trimmed −693,955 −$43M 0.1%
Zoetis Inc Trimmed −260,409 −$40.6M 0.7%
AP Accenture PLC Ireland Trimmed −133,923 −$40M 0.5%
Boeing Co Added +180,247 +$37.8M 0.4%
GH Generac Hldgs Inc Trimmed −253,597 −$36.3M 0.1%
Cloudflare Inc Added +180,604 +$35.4M 0.1%

Showing the 10 largest of 1620 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 09, 2025

Company Action Shares changed Value of change % of portfolio
Meta Platforms Inc Added +173,886 +$100M 1.0%
Aaon Inc Added +1,007,906 +$78.7M 0.5%
Ge Vernova Inc Added +222,607 +$68M 0.3%
Intuit Trimmed −109,813 −$67.4M 0.5%
Pool Corp Trimmed −190,741 −$60.7M 0.5%
Zoetis Inc Trimmed −347,906 −$57.3M 0.9%
Danaher Corporation Trimmed −274,101 −$56.2M 0.9%
WM Waste Mgmt Inc Del Added +199,949 +$46.3M 0.2%
SC Schwab Charles Corp Trimmed −566,974 −$44.4M 0.2%
Qualcomm Inc Added +288,257 +$44.3M 0.3%

Showing the 10 largest of 1615 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 12, 2025

Company Action Shares changed Value of change % of portfolio
Palo Alto Networks Inc Added +657,597 +$120M 0.7%
Arista Networks Inc New +837,152 +$92.5M 0.3%
Block Inc Added +982,699 +$83.5M 0.4%
Arista Networks Inc Exited −213,162 −$81.8M —
Blackrock Inc New +52,623 +$53.9M 0.2%
CA Clearwater Analytics Hldgs I Added +1,710,141 +$47.1M 0.1%
Nvidia Corporation Added +347,775 +$46.7M 2.0%
Bwx Technologies Inc Added +384,323 +$42.8M 0.1%
Boeing Co Added +226,135 +$40M 0.2%
Dexcom Inc Trimmed −509,462 −$39.6M 0.5%

Showing the 10 largest of 1621 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 12, 2024

Company Action Shares changed Value of change % of portfolio
Cintas Corp Added +738,377 +$152M 0.6%
Broadcom Inc Added +610,129 +$105M 0.3%
Dexcom Inc Trimmed −1,557,310 −$104M 0.5%
Nvidia Corporation Added +779,849 +$94.7M 1.7%
Aaon Inc Added +607,465 +$65.5M 0.4%
Starbucks Corp Trimmed −452,040 −$44.1M 0.4%
CH Crowdstrike Hldgs Inc Trimmed −151,068 −$42.4M 0.1%
Blackrock Inc Exited −53,332 −$42M —
Costar Group Inc Trimmed −546,902 −$41.3M 0.9%
PS Pure Storage Inc Added +769,040 +$38.6M 0.5%

Showing the 10 largest of 1626 changes.

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