T. Rowe Price Associates
BLLN

T. Rowe Price Associates’s BillionToOne Inc BLLN Stock Holding History

T. Rowe Price Associates’s Portfolio BLLN Stock Details BLLN Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$121M Buy
1,010,322
+272,804
+37% +$24.9M 0.01% 647
2026
Q1 		$58.2M Buy
737,518
+252,235
+52% +$20.6M 0.01% 733
2025
Q4 		$39.7M Buy
+485,283
New +$49.2M ﹤0.01% 875

Other funds holding BLLN

ASP
Adams Street Partners Chicago, Illinois $443M AUM 49.46% 1-Year Est. Return
Baillie Gifford & Co
Baillie Gifford & Co Edinburgh, United Kingdom $110B AUM 4.8% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
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
BAMCO Inc
BAMCO Inc New York $66.6B AUM 7.35% 1-Year Est. Return
WA
Wasatch Advisors Salt Lake City, Utah $15.3B AUM 25.06% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return

T. Rowe Price Associates's BLLN Position: Q2 2026 in Review

T. Rowe Price Associates increased its BillionToOne Inc (BLLN) stake by 37% in Q2 2026, buying an estimated $24.9M and bringing the position to 1,010,322 shares worth $121M. The position accounts for 0.01% of the portfolio, ranked #647.

T. Rowe Price Associates first reported a position in BLLN in Q4 2025 and has held it in 3 quarters since. 157 funds tracked by Wall St. Rank hold BLLN as of Q2 2026.

  • T. Rowe Price Associates held 1,010,322 shares of BillionToOne Inc worth $121M as of Q2 2026.
  • T. Rowe Price Associates bought 272,804 BillionToOne Inc shares in Q2 2026, an estimated $24.9M.
  • BillionToOne Inc made up 0.01% of T. Rowe Price Associates's portfolio in Q2 2026, its #647 holding.
  • T. Rowe Price Associates first reported a position in BillionToOne Inc in Q4 2025 and has held it in 3 quarters since.
  • 157 funds tracked by Wall St. Rank held BillionToOne Inc as of Q2 2026.

Based on T. Rowe Price Associates's 13F filing for Q2 2026, filed 14 Aug 2026.