WILLIAM BLAIR INVESTMENT MANAGEMENT, LLCWILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Institutional investor · Portfolio as of Q1 2026

SEC EDGAR SourceSEC Filings

Top Holdings413 positions

Activity:
Stock
Shares
Value
Weight
Avg Buy
Est. P&L
Held
Conviction
TSMTSM
ADR

TAIWAN SEMICONDUCTOR MANUFAC

5.5M$1.9B6.2%$49.26+781.18%
30 qtrssince 2018-Q4
Decreased
0

NVIDIA CORPORATION

8.9M$1.6B5.2%$117.25+79.92%
20 qtrssince 2021-Q2
Decreased
0

APPLE INC

4.8M$1.2B4.0%$216.91+45.37%
8 qtrssince 2024-Q2
Decreased
0

MICROSOFT CORP

2.9M$1.1B3.5%$254.17+51.51%
30 qtrssince 2018-Q4
Decreased
0

ALPHABET INC

2.5M$720.2M2.4%$243.59+46.63%
30 qtrssince 2018-Q4
Decreased
0

BROADCOM INC

2.2M$681.4M2.3%$177.43+125.43%
8 qtrssince 2024-Q2
Decreased
0

AMAZON COM INC

3.2M$658.9M2.2%$125.35+95.73%
30 qtrssince 2018-Q4
Decreased
0

META PLATFORMS INC

1M$579.6M1.9%$531.25+25.97%
30 qtrssince 2018-Q4
Decreased
0

MASTERCARD INCORPORATED

1.1M$530M1.8%$306.90+71.63%
30 qtrssince 2018-Q4
Decreased
0

ASTRAZENECA PLC

1.9M$377.3M1.2%$201.76-14.94%
1 qtr
New
71

LINDE PLC

636,338$315.5M1.0%$365.32+45.02%
13 qtrssince 2023-Q1
Decreased
0

CARLYLE GROUP INC

6.3M$304.9M1.0%$33.04+35.30%
14 qtrssince 2022-Q4
Decreased
0

COSTCO WHOLESALE CORPORATION

302,468$301.4M1.0%$491.82+86.30%
30 qtrssince 2018-Q4
Decreased
0
ITUBITUB
Preferred

ITAU UNIBANCO HLDG S A

31.7M$265.6M0.9%$5.63+53.08%
17 qtrssince 2022-Q1
Decreased
0

TWIST BIOSCIENCE CORP

5.3M$250.4M0.8%$41.17+120.17%
25 qtrssince 2020-Q1
Decreased
0

SERVICENOW INC

2.4M$248M0.8%$146.26-26.35%
12 qtrssince 2023-Q2
Increased
48

PRIMO BRANDS CORPORATION

13.1M$245.8M0.8%$28.32-15.30%
6 qtrssince 2024-Q4
Increased
45

MUELLER INDS INC

2.1M$233.8M0.8%$85.04-32.98%
6 qtrssince 2024-Q4
Increased
51

INTUIT

533,736$230.8M0.8%$445.72-38.31%
30 qtrssince 2018-Q4
Increased
52

MONSTER BEVERAGE CORP NEW

2.9M$212.7M0.7%$61.17+59.22%
13 qtrssince 2023-Q1
Decreased
0
Showing 20 of 413 results.393 more with Pro.PROUpgrade to see all →
$30.3B
AUM
413
Positions
Q1 2026
Filing
Rating · 2.0
Quarterly Portfolio Change
+1%Q4'24$40.9B-13%Q1'25$35.6B+6%Q2'25$37.7B+3%Q3'25$38.7B-7%Q4'25$35.9B-16%Q1'26$30.3B
Activity profile
$ moved · Q1'26
New18%Increased13%Decreased55%Exited15%
Composition
Equity vs derivatives
Equity100%Puts0%Calls0%
Holding period
Avg 3.8 years
<1Q6%1-4Q17%1-2Y12%2Y+64%

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC manages $30.3B across 413 positions as of Q1 2026. Top holdings: TSM (6.2%), NVDA (5.2%), AAPL (4.0%). Fund DNA: Steady Compounder. HoldingsIntel Rating: 2/5.0.

Q1 2026 Summary

Active quarter - 47 new positions, 47 exits, 156 increased. Top move: AZN (NEW, conviction 71). Portfolio: $30.3B across 413 positions.

Top holdings by portfolio weight

Total AUM$30B
TSM6.16%
NVDA5.15%
AAPL4.04%
MSFT3.54%
GOOGL2.38%
AVGO2.25%
AMZN2.18%
META1.92%
MA1.75%
AZN1.25%
Other1.04%

Portfolio allocation by GICS sector

Sectors11
Technology36.16%
Healthcare12.60%
Industrials11.70%
Financial Services11.56%
Consumer Cyclical10.12%
Communication Services4.96%
Consumer Defensive4.22%
Basic Materials3.95%
Energy2.11%
Real Estate1.36%
Other1.26%

Behavioral investing profile

7-dimension quality assessment
Below Average(2.0 / 5.0)
Track Record64
Conviction41
Concentration46
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Position Outcomes

Best and worst performing positions by estimated return

Cost basis estimates based on full filing history using quarter-end prices. Actual transaction prices are not disclosed in 13F filings.

Accumulation Streaks

Positions with 2+ consecutive quarters of increases - persistent directional conviction.

Security
7Q
DFINDFINDONNELLEY FINL SOLUTIONS INC
Q3 2024 Q1 2026+226,446 shares+$6.7M
6Q
PWPPWPPERELLA WEINBERG PARTNERS
Q4 2024 Q1 2026+2.9M shares+$50.7M
6Q
PRCTPRCTPROCEPT BIOROBOTICS CORP
Q4 2024 Q1 2026+211,807 shares-$6.4M

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Data sourced from SEC EDGAR 13F filings. Not financial advice. Full disclaimer

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