SEC holdings report of an institutional investment manager
What does WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC report holding?
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC reported holdings of $33.25 billion on Form 13F for the quarter ended 30 June 2026, ranked 242nd of 8,857 managers by reported value. The report was filed on .
The ten largest holdings of WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC, quarter ended 30 June 2026
Each bar is the value of one position, as WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC filed it for the quarter ended 30 June 2026. The 25 largest positions are under "The numbers behind the chart".
Observed .
Reported value
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC reported holdings of $33.25 billion on Form 13F for the quarter ended 30 June 2026, ranked 242nd of 8,857 managers by reported value.
In the quarter before, the quarter ended 31 March 2026, it reported $30.26 billion, so the value is up from then (+9.9%).
Its table has 403 entries, which make 403 positions when the lines of a security are summed.
The filing
Filed on for the quarter ended 30 June 2026; the manager is in CHICAGO, IL.
The SEC's accession number of the filing is 0001644956-26-000023. The filing is the manager's own. This page shows the value it states for its table and the lines of the table, summed.
As filed
Facts as filed with the SEC, and our arithmetic on them. Not investment advice.
Understanding the report of WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Where it stands today
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC reported $33.3 billion for the quarter ended 30 June 2026, ranked 242nd of 8,857 managers.
Where do these numbers come from?
An institutional investment manager that holds 100 million dollars or more of the securities Form 13F covers files a report with the SEC every quarter. This page shows the report of WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC for the quarter ended 30 June 2026.
Read more
The rank counts every manager that filed a holdings report for the quarter, by the total value its table states, the largest first.
The numbers behind the chart
What are the largest holdings of WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC?25 positions
| Issuer, as filed | Class | Value | Share of its value | Shares | Change from 31 March 2026 |
|---|---|---|---|---|---|
| TAIWAN SEMICONDUCTOR MANUFAC | SPONSORED ADS | $2.36B | 7.1% | 4.94M | −10.5% |
| NVIDIA CORPORATION | COM | $1.72B | 5.2% | 8.60M | −3.8% |
| ALPHABET INC | CAP STK CL A | $1.14B | 3.4% | 3.19M | +27.4% |
| APPLE INC | COM | $943M | 2.8% | 3.26M | −32.3% |
| BROADCOM INC | COM | $777M | 2.3% | 2.06M | −6.6% |
| MICROSOFT CORP | COM | $764M | 2.3% | 2.05M | −29.3% |
| META PLATFORMS INC | CL A | $535M | 1.6% | 950K | −6.2% |
| AMAZON COM INC | COM | $474M | 1.4% | 1.99M | −37.2% |
| MASTERCARD INCORPORATED | CL A | $471M | 1.4% | 918K | −13.4% |
| ADVANCED MICRO DEVICES INC | COM | $444M | 1.3% | 764K | −26.8% |
| APPLIED MATLS INC | COM | $360M | 1.1% | 498K | +1325.1% |
| GE AEROSPACE | COM NEW | $296M | 0.89% | 791K | New |
| ASTRAZENECA PLC | ORD | $283M | 0.85% | 1.51M | −22.0% |
| PRIMO BRANDS CORPORATION | CLASS A COM SHS | $279M | 0.84% | 11.4M | −12.5% |
| EVERPURE INC | CL A | $272M | 0.82% | 3.46M | +19.9% |
| AMPHENOL CORP | CL A | $271M | 0.81% | 1.54M | +42.5% |
| LINDE PLC | SHS | $262M | 0.79% | 505K | −20.6% |
| ONTO INNOVATION INC | COM | $252M | 0.76% | 665K | −31.0% |
| BORGWARNER INC | COM | $251M | 0.76% | 3.78M | +31.2% |
| CARLYLE GROUP INC | COM | $249M | 0.75% | 5.91M | −6.1% |
| ARGENX SE | SPONSORED ADR | $245M | 0.74% | 265K | −0.5% |
| MUELLER INDS INC | COM | $244M | 0.73% | 1.99M | −5.9% |
| MONSTER BEVERAGE CORP NEW | COM | $244M | 0.73% | 2.54M | −13.5% |
| F5 INC | COM | $244M | 0.73% | 586K | −9.8% |
| CREDICORP LTD | COM | $244M | 0.73% | 625K | +0.4% |
The table scrolls sideways; the first column stays in place.
Which positions are new in the quarter ended 30 June 2026?10 positions, the largest first
| Issuer, as filed | Class | Value |
|---|---|---|
| GE AEROSPACE | COM NEW | $296M |
| CROWDSTRIKE HLDGS INC | CL A | $215M |
| SEAGATE TECHNOLOGY HLDNGS PL | ORD SHS | $184M |
| CANADIAN NAT RES LTD MED TER | COM | $144M |
| FORGENT POWER SOLUTIONS INC | COM SHS CL A | $141M |
| PTC THERAPEUTICS INC | COM | $141M |
| ETSY INC | COM | $120M |
| REPLIGEN CORP | COM | $108M |
| HUDBAY MINERALS INC | COM | $99.5M |
| APPLIED OPTOELECTRONICS INC | COM | $74.7M |
Which positions were sold out since the quarter ended 31 March 2026?10 positions, the largest first
| Issuer, as filed | Class | Value then |
|---|---|---|
| COHERENT CORP | COM | $159M |
| VEEVA SYS INC | CL A COM | $113M |
| DOXIMITY INC | CL A | $113M |
| PLANET FITNESS MASTER ISSUER | CL A | $108M |
| POOL CORP | COM | $91.5M |
| ADVANCED DRAIN SYS INC DEL | COM | $89.9M |
| PARSONS CORP DEL | COM | $80.6M |
| TYLER TECHNOLOGIES INC | COM | $73.9M |
| INSPIRE MED SYS INC | COM | $58.7M |
| SPOTIFY TECHNOLOGY S A | SHS | $51.9M |
What did WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC report in each quarter?8 quarters
| Quarter ended | Filed | Value reported | Entries | Rank |
|---|---|---|---|---|
| $33.3B | 403 | 242 | ||
| $30.3B | 413 | 224 | ||
| $35.9B | 413 | 204 | ||
| $38.7B | 414 | 182 | ||
| $37.7B | 417 | 182 | ||
| $35.6B | 423 | 174 | ||
| $40.9B | 433 | 167 | ||
| $40.5B | 412 | 160 |
The table scrolls sideways; the first column stays in place.
What do these figures leave out, and where are they from?Limits and source
What this number cannot tell you
- A manager reports the value of its holdings on the last day of a quarter, within 45 days after it. A report that the manager amended is shown with the amendments applied.
- Values are as filed, in dollars. A manager that files a combination report includes the holdings of the managers it names, so the same holding can be in two reports.
- Only holdings that Form 13F covers are reported: US exchange-traded stocks and some funds, options and convertible bonds. Cash, most bonds and holdings abroad are not in a report.
- The table lists a position once for each security, class, and put or call: the lines of the manager's table are summed. A line for a put or call states the value of the shares the option covers, not what the option costs or is worth.
- A share is the value of a position as a part of the value of all the lines of the manager's table.
- Where a name as filed includes the trademarked name of a stock index, the page shows [index name] in its place.
- A position is new when the manager's table for the quarter before has no line for the security, and sold out when its table for this quarter has none. It says nothing about when a position was bought or sold: only the quarter ends are compared.
- A manager can ask the SEC to keep some of its holdings confidential for a time; those holdings are missing from its report until it discloses them.
Observed .
Page updated