William Blair & Company’s Waystar Holding Corp WAY Stock Holding History

William Blair & Company’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 Q2	$3.76M	Buy	183,189 +55,740	+44%	+$1.17M	0.01%	594
2026 Q1	$3.07M	Sell	127,449 -77,419	-38%	-$2.05M	0.01%	621
2025 Q4	$6.71M	Buy	204,868 +62,995	+44%	+$2.24M	0.02%	446
2025 Q3	$5.38M	Buy	141,873 +40,231	+40%	+$1.49M	0.01%	499
2025 Q2	$4.15M	Buy	101,642 +40,125	+65%	+$1.55M	0.01%	545
2025 Q1	$2.3M	Buy	61,517 +1,975	+3%	+$78.2K	0.01%	681
2024 Q4	$2.19M	Buy	59,542 +14,000	+31%	+$430K	0.01%	692
2024 Q3	$1.27M	Buy	+45,542	New	+$1.12M	﹤0.01%	835

Other funds holding WAY

EFM

EQT Fund Management Luxembourg $863M AUM 26.03% 1-Year Est. Return

Canada Pension Plan Investment Board Toronto Ontario, Ontario, Canada $181B AUM 41.77% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

BCI

Bain Capital Investors Boston, Massachusetts $4.82B AUM 35.43% 1-Year Est. Return

Advent International Boston, Massachusetts $17.7B AUM 5.23% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

GAM

Goldentree Asset Management New York $1.72B AUM 1.39% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Bank of Montreal Toronto, Ontario, Canada $304B AUM 35.64% 1-Year Est. Return

William Blair & Company's WAY Position: Q2 2026 in Review

William Blair & Company increased its Waystar Holding Corp (WAY) stake by 44% in Q2 2026, buying an estimated $1.17M and bringing the position to 183,189 shares worth $3.76M. The position accounts for 0.01% of the portfolio, ranked #594.

William Blair & Company first reported a position in WAY in Q3 2024 and has held it in 8 quarters since. The position peaked at $6.71M in Q4 2025. 301 funds tracked by Wall St. Rank hold WAY as of Q2 2026.

William Blair & Company held 183,189 shares of Waystar Holding Corp worth $3.76M as of Q2 2026.
William Blair & Company bought 55,740 Waystar Holding Corp shares in Q2 2026, an estimated $1.17M.
Waystar Holding Corp made up 0.01% of William Blair & Company's portfolio in Q2 2026, its #594 holding.
William Blair & Company first reported a position in Waystar Holding Corp in Q3 2024 and has held it in 8 quarters since.
William Blair & Company's Waystar Holding Corp position peaked at $6.71M in Q4 2025.
301 funds tracked by Wall St. Rank held Waystar Holding Corp as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.