William Blair Investment Management
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William Blair Investment Management’s Waystar Holding Corp WAY Stock Holding History

William Blair Investment Management’s Portfolio WAY Stock Details WAY Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-5,282,220
Closed -$173M – 459
2025
Q4 		$173M Buy
5,282,220
+19,033
+0.4% +$678K 0.48% 50
2025
Q3 		$200M Buy
5,263,187
+23,822
+0.5% +$883K 0.52% 49
2025
Q2 		$214M Buy
5,239,365
+1,011,940
+24% +$39M 0.57% 39
2025
Q1 		$158M Buy
+4,227,425
New +$167M 0.44% 63

Other funds holding WAY

EFM
EQT Fund Management Luxembourg $863M AUM 26.03% 1-Year Est. Return
Canada Pension Plan Investment Board
Canada Pension Plan Investment Board Toronto Ontario, Ontario, Canada $181B AUM 41.77% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Bain Capital Investors
Bain Capital Investors Boston, Massachusetts $4.82B AUM 35.43% 1-Year Est. Return
Advent International
Advent International Boston, Massachusetts $17.7B AUM 5.23% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Neuberger Berman Group
Neuberger Berman Group New York $150B AUM 40.08% 1-Year Est. Return
GAM
Goldentree Asset Management New York $1.72B AUM 1.39% 1-Year Est. Return

William Blair Investment Management's WAY Position: Q1 2026 in Review

William Blair Investment Management sold out of Waystar Holding Corp (WAY) in Q1 2026, closing a stake of 5,282,220 shares — an estimated $173M sold.

William Blair Investment Management first reported a position in WAY in Q1 2025 and held it in 4 quarters. The position peaked at $214M in Q2 2025. 307 funds tracked by Wall St. Rank hold WAY as of Q1 2026.

  • William Blair Investment Management reported no remaining Waystar Holding Corp position as of Q1 2026 after selling out during the quarter.
  • William Blair Investment Management sold 5,282,220 Waystar Holding Corp shares in Q1 2026, an estimated $173M.
  • William Blair Investment Management first reported a position in Waystar Holding Corp in Q1 2025 and held it in 4 quarters.
  • William Blair Investment Management's Waystar Holding Corp position peaked at $214M in Q2 2025.
  • 307 funds tracked by Wall St. Rank held Waystar Holding Corp as of Q1 2026.

Based on William Blair Investment Management's 13F filing for Q1 2026, filed 8 May 2026.