William Blair Investment Management 13F Holdings & Latest Moves
William Blair Investment Management reported a 13F portfolio worth $30.26B as of Q1 2026. Latest 13F moves (filed May 8, 2026): 5 new positions, 16 added, 43 reduced. Largest change by value: reduced $TSM ($2.64B held).
- 13F value (Q1 2026)
- $30.26B
- New positions
- 5
- Added / reduced
- 16 / 43
- Sold out
- 0
Top buys and sells in the latest 13F
Biggest new and added positions
| Filed | Ticker | Move | Change | Shares held | Value held | 1W | 1M | 6M | Story |
|---|---|---|---|---|---|---|---|---|---|
| $AZN | Added | +1.90M (+4027.06%) | 1.94M | $368.27M | -0.7% | -0.7% | — | ||
| $AZN | Added | +1.90M (+4027.06%) | 1.94M | $354.02M | -0.7% | -0.7% | — | ||
| $PRMB | Added | +428.77K (+3.40%) | 13.06M | $319.09M | — | ||||
| $PRMB | Added | +428.77K (+3.40%) | 13.06M | $307.34M | — | ||||
| $MLI | Added | +329.82K (+18.53%) | 2.11M | $291.33M | -3.1% | -5.1% | — |
Biggest reduced and exited positions
| Filed | Ticker | Move | Change | Shares held | Value held | 1W | 1M | 6M | Story |
|---|---|---|---|---|---|---|---|---|---|
| $TSM | Reduced | -467.07K (-7.80%) | 5.52M | $2.64B | -1.8% | +3.7% | — | ||
| $NVDA | Reduced | -1.69M (-15.87%) | 8.94M | $1.77B | +4.7% | -2.9% | — | ||
| $AAPL | Reduced | -631.89K (-11.61%) | 4.81M | $1.38B | +2.4% | +2.9% | — | ||
| $MSFT | Reduced | -593.52K (-17%) | 2.90M | $1.07B | +1.6% | -0.6% | — | ||
| $GOOGL | Reduced | -650.37K (-20.61%) | 2.50M | $893.14M | -1.0% | -9.3% | — |
New positions in the latest 13F
Added positions in the latest 13F
| Filed | Ticker | Move | Change | Shares held | Value held | 1W | 1M | 6M | Story |
|---|---|---|---|---|---|---|---|---|---|
| $AZN | Added | +1.90M (+4027.06%) | 1.94M | $368.27M | -0.7% | -0.7% | — | ||
| $AZN | Added | +1.90M (+4027.06%) | 1.94M | $354.02M | -0.7% | -0.7% | — | ||
| $PRMB | Added | +428.77K (+3.40%) | 13.06M | $319.09M | — | ||||
| $PRMB | Added | +428.77K (+3.40%) | 13.06M | $307.34M | — | ||||
| $MLI | Added | +329.82K (+18.53%) | 2.11M | $291.33M | -3.1% | -5.1% | — | ||
| $STRL | Added | +282.17K (+683.97%) | 323.42K | $271.47M | +0.5% | +5.6% | — | ||
| $FFIV | Added | +99.68K (+18.12%) | 649.95K | $270.35M | +2.4% | +11.9% | — | ||
| $MLI | Added | +329.82K (+18.53%) | 2.11M | $259.14M | -3.1% | -5.1% | — | ||
| $ARGX | Added | +42.40K (+18.96%) | 266.07K | $246.85M | +2.2% | +12.8% | — | ||
| $ARGX | Added | +42.40K (+18.96%) | 266.07K | $239.18M | +2.2% | +12.8% | — | ||
| $NOW | Added | +222.83K (+10.37%) | 2.37M | $232.12M | +4.3% | +25.2% | — | ||
| $NXT | Added | +259.69K (+19.06%) | 1.62M | $209.41M | +14.6% | -0.2% | — | ||
| $RRX | Added | +78.21K (+10.30%) | 837.49K | $199.48M | -8.0% | -1.9% | Read | ||
| $HALO | Added | +683.02K (+37.06%) | 2.53M | $197.71M | +4.7% | +10.3% | Read | ||
| $CHRW | Added | +604.16K (+138.09%) | 1.04M | $196.44M | -4.6% | +10.1% | Read | ||
| $NXT | Added | +259.69K (+19.06%) | 1.62M | $194.18M | +14.6% | -0.2% | Read |
Reduced positions in the latest 13F
| Filed | Ticker | Move | Change | Shares held | Value held | 1W | 1M | 6M | Story |
|---|---|---|---|---|---|---|---|---|---|
| $TSM | Reduced | -467.07K (-7.80%) | 5.52M | $2.64B | -1.8% | +3.7% | — | ||
| $NVDA | Reduced | -1.69M (-15.87%) | 8.94M | $1.77B | +4.7% | -2.9% | — | ||
| $AAPL | Reduced | -631.89K (-11.61%) | 4.81M | $1.38B | +2.4% | +2.9% | — | ||
| $MSFT | Reduced | -593.52K (-17%) | 2.90M | $1.07B | +1.6% | -0.6% | — | ||
| $GOOGL | Reduced | -650.37K (-20.61%) | 2.50M | $893.14M | -1.0% | -9.3% | — | ||
| $AVGO | Reduced | -335.05K (-13.21%) | 2.20M | $826.92M | -1.1% | -7.8% | — | ||
| $AMZN | Reduced | -1.22M (-27.89%) | 3.16M | $760.98M | -3.1% | -10.1% | — | ||
| $AMD | Reduced | -296.95K (-22.17%) | 1.04M | $588.95M | -6.8% | +7.7% | — | ||
| $META | Reduced | -173.65K (-14.63%) | 1.01M | $570.68M | +0.8% | -4.0% | — | ||
| $MA | Reduced | -24.30K (-2.24%) | 1.06M | $544.75M | -0.3% | -2.0% | — | ||
| $TWST | Reduced | -684.71K (-11.50%) | 5.27M | $542.15M | -13.5% | +23.2% | — | ||
| $TWST | Reduced | -684.71K (-11.50%) | 5.27M | $390.33M | -13.5% | +23.2% | — | ||
| $ONTO | Reduced | -762.37K (-44.15%) | 964.21K | $368.03M | -4.5% | -5.5% | — | ||
| $LIN | Reduced | -7.13K (-1.11%) | 636.34K | $330.22M | +2.6% | +2.1% | — | ||
| $LIN | Reduced | -7.13K (-1.11%) | 636.34K | $327.99M | +2.6% | +2.1% | — | ||
| $LSCC | Reduced | -81.54K (-3.84%) | 2.04M | $312.61M | — | ||||
| $LSCC | Reduced | -81.54K (-3.84%) | 2.04M | $290.18M | — | ||||
| $SNOW | Reduced | -219.47K (-16.29%) | 1.13M | $283.74M | +3.3% | +57.7% | — | ||
| $COST | Reduced | -26K (-7.92%) | 302.47K | $282.95M | +4.0% | -3.4% | — | ||
| $MNST | Reduced | -826K (-21.96%) | 2.94M | $282.14M | +0.9% | +2.5% | — | ||
| $CG | Reduced | -830.79K (-11.65%) | 6.30M | $280.71M | -5.2% | -13.3% | — | ||
| $UNH | Reduced | -88.98K (-11.67%) | 673.26K | $279.83M | +3.7% | +7.0% | — | ||
| $MNST | Reduced | -826K (-21.96%) | 2.94M | $270.13M | +0.9% | +2.5% | — | ||
| $CG | Reduced | -830.79K (-11.65%) | 6.30M | $265.34M | -5.2% | -13.3% | — | ||
| $COHR | Reduced | -204.92K (-23.47%) | 668.14K | $263.56M | +14.1% | +19.9% | — | ||
| $BAP | Reduced | -144.72K (-18.86%) | 622.69K | $242.59M | -4.3% | +1.4% | — | ||
| $A | Reduced | -267.25K (-12.95%) | 1.80M | $236.75M | -3.4% | +14.8% | — | ||
| $A | Reduced | -267.25K (-12.95%) | 1.80M | $233.18M | -3.4% | +14.8% | — | ||
| $BAP | Reduced | -144.72K (-18.86%) | 622.69K | $229.39M | -4.3% | +1.4% | — | ||
| $CRS | Reduced | -66.66K (-15.96%) | 350.90K | $216.45M | -4.4% | +16.7% | — | ||
| $NVT | Reduced | -141.28K (-10.27%) | 1.23M | $209.28M | -0.6% | -3.6% | — | ||
| $GTX | Reduced | -296.59K (-4.89%) | 5.76M | $208.78M | +6.8% | +11.5% | Read | ||
| $TRU | Reduced | -1.07M (-27.09%) | 2.89M | $208.57M | -8.0% | -4.3% | Read | ||
| $NVT | Reduced | -141.28K (-10.27%) | 1.23M | $204.63M | -0.6% | -3.6% | Read | ||
| $ORLY | Reduced | -771.47K (-25.88%) | 2.21M | $203.52M | -4.8% | -4.2% | — | ||
| $TLN | Reduced | -44.19K (-7.76%) | 525.21K | $201.82M | -13.5% | -5.6% | Read | ||
| $ORLY | Reduced | -771.47K (-25.88%) | 2.21M | $199.25M | -4.8% | -4.2% | Read | ||
| $CRS | Reduced | -66.66K (-15.96%) | 350.90K | $197.36M | -4.4% | +16.7% | Read | ||
| $IDXX | Reduced | -89.70K (-20.33%) | 351.62K | $196.09M | -5.6% | +0.2% | Read | ||
| $CAVA | Reduced | -25.28K (-1.04%) | 2.39M | $195.99M | -3.2% | -7.3% | — | ||
| $BWXT | Reduced | -125.82K (-11.36%) | 981.78K | $194.30M | -0.3% | -8.6% | Read | ||
| $IDXX | Reduced | -89.70K (-20.33%) | 351.62K | $193.92M | -5.6% | +0.2% | — | ||
| $CIEN | Reduced | -700.01K (-63.72%) | 398.58K | $190.65M | +1.2% | -14.9% | Read |
All tracked 13F moves by William Blair Investment Management
| Filed | Ticker | Move | Change | Shares held | Value held | 1W | 1M | 6M | Story |
|---|---|---|---|---|---|---|---|---|---|
| $TLN | Reduced | -44.19K (-7.76%) | 525.21K | $201.82M | -13.5% | -5.6% | Read | ||
| $TSM | Reduced | -467.07K (-7.80%) | 5.52M | $2.64B | -1.8% | +3.7% | — | ||
| $MA | Reduced | -24.30K (-2.24%) | 1.06M | $544.75M | -0.3% | -2.0% | — | ||
| $LSCC | Reduced | -81.54K (-3.84%) | 2.04M | $290.18M | — | ||||
| $LIN | Reduced | -7.13K (-1.11%) | 636.34K | $330.22M | +2.6% | +2.1% | — | ||
| $LIN | Reduced | -7.13K (-1.11%) | 636.34K | $327.99M | +2.6% | +2.1% | — | ||
| $LSCC | Reduced | -81.54K (-3.84%) | 2.04M | $312.61M | — | ||||
| $GTX | Reduced | -296.59K (-4.89%) | 5.76M | $208.78M | +6.8% | +11.5% | Read | ||
| $COST | Reduced | -26K (-7.92%) | 302.47K | $282.95M | +4.0% | -3.4% | — | ||
| $CAVA | Reduced | -25.28K (-1.04%) | 2.39M | $195.99M | -3.2% | -7.3% | — | ||
| $SYNA | New | +1.59M | 1.59M | $197.06M | +2.2% | +8.4% | — | ||
| $POWI | New | +2.38M | 2.38M | $199.41M | -0.1% | +4.9% | Read | ||
| $P | New | +2.88M | 2.88M | $227.03M | +3.9% | -5.6% | — | ||
| $BWA | New | +2.88M | 2.88M | $196.43M | +3.1% | +24.0% | — | ||
| $AKAM | New | +1.62M | 1.62M | $194.47M | +2.1% | -4.0% | — | ||
| $UNH | Reduced | -88.98K (-11.67%) | 673.26K | $279.83M | +3.7% | +7.0% | — | ||
| $TWST | Reduced | -684.71K (-11.50%) | 5.27M | $390.33M | -13.5% | +23.2% | — | ||
| $TWST | Reduced | -684.71K (-11.50%) | 5.27M | $542.15M | -13.5% | +23.2% | — | ||
| $TRU | Reduced | -1.07M (-27.09%) | 2.89M | $208.57M | -8.0% | -4.3% | Read | ||
| $CG | Reduced | -830.79K (-11.65%) | 6.30M | $265.34M | -5.2% | -13.3% | — | ||
| $SNOW | Reduced | -219.47K (-16.29%) | 1.13M | $283.74M | +3.3% | +57.7% | — | ||
| $ORLY | Reduced | -771.47K (-25.88%) | 2.21M | $199.25M | -4.8% | -4.2% | Read | ||
| $ONTO | Reduced | -762.37K (-44.15%) | 964.21K | $368.03M | -4.5% | -5.5% | — | ||
| $ORLY | Reduced | -771.47K (-25.88%) | 2.21M | $203.52M | -4.8% | -4.2% | — | ||
| $NVT | Reduced | -141.28K (-10.27%) | 1.23M | $204.63M | -0.6% | -3.6% | Read | ||
| $NVDA | Reduced | -1.69M (-15.87%) | 8.94M | $1.77B | +4.7% | -2.9% | — | ||
| $NVT | Reduced | -141.28K (-10.27%) | 1.23M | $209.28M | -0.6% | -3.6% | — | ||
| $MNST | Reduced | -826K (-21.96%) | 2.94M | $282.14M | +0.9% | +2.5% | — | ||
| $MNST | Reduced | -826K (-21.96%) | 2.94M | $270.13M | +0.9% | +2.5% | — | ||
| $MSFT | Reduced | -593.52K (-17%) | 2.90M | $1.07B | +1.6% | -0.6% | — | ||
| $META | Reduced | -173.65K (-14.63%) | 1.01M | $570.68M | +0.8% | -4.0% | — | ||
| $IDXX | Reduced | -89.70K (-20.33%) | 351.62K | $196.09M | -5.6% | +0.2% | Read | ||
| $IDXX | Reduced | -89.70K (-20.33%) | 351.62K | $193.92M | -5.6% | +0.2% | — | ||
| $CRS | Reduced | -66.66K (-15.96%) | 350.90K | $197.36M | -4.4% | +16.7% | Read | ||
| $BAP | Reduced | -144.72K (-18.86%) | 622.69K | $242.59M | -4.3% | +1.4% | — | ||
| $COHR | Reduced | -204.92K (-23.47%) | 668.14K | $263.56M | +14.1% | +19.9% | — | ||
| $CIEN | Reduced | -700.01K (-63.72%) | 398.58K | $190.65M | +1.2% | -14.9% | Read | ||
| $CG | Reduced | -830.79K (-11.65%) | 6.30M | $280.71M | -5.2% | -13.3% | — | ||
| $CRS | Reduced | -66.66K (-15.96%) | 350.90K | $216.45M | -4.4% | +16.7% | — | ||
| $BWXT | Reduced | -125.82K (-11.36%) | 981.78K | $194.30M | -0.3% | -8.6% | Read | ||
| $AVGO | Reduced | -335.05K (-13.21%) | 2.20M | $826.92M | -1.1% | -7.8% | — | ||
| $BAP | Reduced | -144.72K (-18.86%) | 622.69K | $229.39M | -4.3% | +1.4% | — | ||
| $AAPL | Reduced | -631.89K (-11.61%) | 4.81M | $1.38B | +2.4% | +2.9% | — | ||
| $AMZN | Reduced | -1.22M (-27.89%) | 3.16M | $760.98M | -3.1% | -10.1% | — | ||
| $GOOGL | Reduced | -650.37K (-20.61%) | 2.50M | $893.14M | -1.0% | -9.3% | — | ||
| $A | Reduced | -267.25K (-12.95%) | 1.80M | $236.75M | -3.4% | +14.8% | — | ||
| $AMD | Reduced | -296.95K (-22.17%) | 1.04M | $588.95M | -6.8% | +7.7% | — | ||
| $A | Reduced | -267.25K (-12.95%) | 1.80M | $233.18M | -3.4% | +14.8% | — | ||
| $STRL | Added | +282.17K (+683.97%) | 323.42K | $271.47M | +0.5% | +5.6% | — | ||
| $NOW | Added | +222.83K (+10.37%) | 2.37M | $232.12M | +4.3% | +25.2% | — | ||
| $RRX | Added | +78.21K (+10.30%) | 837.49K | $199.48M | -8.0% | -1.9% | Read | ||
| $PRMB | Added | +428.77K (+3.40%) | 13.06M | $307.34M | — | ||||
| $PRMB | Added | +428.77K (+3.40%) | 13.06M | $319.09M | — | ||||
| $NXT | Added | +259.69K (+19.06%) | 1.62M | $194.18M | +14.6% | -0.2% | Read | ||
| $NXT | Added | +259.69K (+19.06%) | 1.62M | $209.41M | +14.6% | -0.2% | — | ||
| $MLI | Added | +329.82K (+18.53%) | 2.11M | $259.14M | -3.1% | -5.1% | — | ||
| $MLI | Added | +329.82K (+18.53%) | 2.11M | $291.33M | -3.1% | -5.1% | — | ||
| $HALO | Added | +683.02K (+37.06%) | 2.53M | $197.71M | +4.7% | +10.3% | Read | ||
| $FFIV | Added | +99.68K (+18.12%) | 649.95K | $270.35M | +2.4% | +11.9% | — | ||
| $CHRW | Added | +604.16K (+138.09%) | 1.04M | $196.44M | -4.6% | +10.1% | Read | ||
| $AZN | Added | +1.90M (+4027.06%) | 1.94M | $354.02M | -0.7% | -0.7% | — | ||
| $AZN | Added | +1.90M (+4027.06%) | 1.94M | $368.27M | -0.7% | -0.7% | — | ||
| $ARGX | Added | +42.40K (+18.96%) | 266.07K | $239.18M | +2.2% | +12.8% | — | ||
| $ARGX | Added | +42.40K (+18.96%) | 266.07K | $246.85M | +2.2% | +12.8% | — |
13F reports are filed quarterly, up to 45 days after the quarter ends, so they show past holdings. 1W / 1M / 6M = how the stock moved after the filing.
Stocks William Blair Investment Management holds or traded
Frequently asked questions
What did William Blair Investment Management buy and sell in its latest 13F?
It opened or added to $AZN, $AZN, $PRMB, $PRMB and $MLI; it cut or exited $TSM, $NVDA, $AAPL, $MSFT and $GOOGL.
Data comes from public SEC Form 4 and 13F filings and STOCK Act disclosures. Dates are the trade or filing date reported. This page is for research only and is not investment advice.
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