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 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 $1.02B AUM

Canada Pension Plan Investment Board Toronto Ontario, Ontario, Canada $155B AUM 29.93% 1-Year Est. Return

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

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

BCI

Bain Capital Investors Boston, Massachusetts $3.27B AUM 3.23% 1-Year Est. Return

Advent International Boston, Massachusetts $4.24B AUM 4.24% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Neuberger Berman Group New York $131B AUM 28.36% 1-Year Est. Return

GAM

Goldentree Asset Management New York $1.69B AUM 10.69% 1-Year Est. Return

William Blair & Company's WAY Position: Q1 2026 in Review

William Blair & Company reduced its Waystar Holding Corp (WAY) stake by 38% in Q1 2026, selling an estimated $2.05M and leaving 127,449 shares worth $3.07M. The position accounts for 0.01% of the portfolio, ranked #621.

William Blair & Company first reported a position in WAY in Q3 2024 and has held it in 7 quarters since. The position peaked at $6.71M in Q4 2025. 307 funds tracked by Wall St. Rank hold WAY as of Q1 2026.

William Blair & Company held 127,449 shares of Waystar Holding Corp worth $3.07M as of Q1 2026.
William Blair & Company sold 77,419 Waystar Holding Corp shares in Q1 2026, an estimated $2.05M.
Waystar Holding Corp made up 0.01% of William Blair & Company's portfolio in Q1 2026, its #621 holding.
William Blair & Company first reported a position in Waystar Holding Corp in Q3 2024 and has held it in 7 quarters since.
William Blair & Company's Waystar Holding Corp position peaked at $6.71M in Q4 2025.
307 funds tracked by Wall St. Rank held Waystar Holding Corp as of Q1 2026.

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