XTX Topco’s BillionToOne Inc BLLN Stock Holding History

XTX Topco’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	$2.18M	Buy	18,152 +4,973	+38%	+$454K	0.03%	1036
2026 Q1	$1.04M	Sell	13,179 -7,499	-36%	-$614K	0.02%	1379
2025 Q4	$1.69M	Buy	+20,678	New	+$2.1M	0.04%	674

Other funds holding BLLN

ASP

Adams Street Partners Chicago, Illinois $443M AUM 49.46% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Baillie Gifford & Co Edinburgh, United Kingdom $110B AUM 4.8% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Neuberger Berman Group New York $150B AUM 40.08% 1-Year Est. Return

BAMCO Inc New York $66.6B AUM 7.35% 1-Year Est. Return

Wasatch Advisors Salt Lake City, Utah $15.3B AUM 25.06% 1-Year Est. Return

Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

XTX Topco's BLLN Position: Q2 2026 in Review

XTX Topco increased its BillionToOne Inc (BLLN) stake by 38% in Q2 2026, buying an estimated $454K and bringing the position to 18,152 shares worth $2.18M. The position accounts for 0.03% of the portfolio, ranked #1036.

XTX Topco first reported a position in BLLN in Q4 2025 and has held it in 3 quarters since. 156 funds tracked by Wall St. Rank hold BLLN as of Q2 2026.

XTX Topco held 18,152 shares of BillionToOne Inc worth $2.18M as of Q2 2026.
XTX Topco bought 4,973 BillionToOne Inc shares in Q2 2026, an estimated $454K.
BillionToOne Inc made up 0.03% of XTX Topco's portfolio in Q2 2026, its #1036 holding.
XTX Topco first reported a position in BillionToOne Inc in Q4 2025 and has held it in 3 quarters since.
156 funds tracked by Wall St. Rank held BillionToOne Inc as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.