Citadel Advisors
BLLN

Citadel Advisors’s BillionToOne Inc BLLN Stock Holding History

Citadel Advisors’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 		$2.59M Buy
21,600
+16,200
+300% +$1.48M ﹤0.01% 5985
2026
Q1 		$426K Buy
+5,400
New +$442K ﹤0.01% 9686

Other funds holding BLLN

ASP
Adams Street Partners Chicago, Illinois $443M AUM 49.46% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 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

Citadel Advisors's BLLN Position: Q2 2026 in Review

Citadel Advisors opened a new position in BillionToOne Inc (BLLN) in Q2 2026: 15,155 shares worth $1.82M. The stake represents ﹤0.01% of the portfolio and ranks #6767 among its holdings. This is a return to the name: Citadel Advisors previously reported a position in BLLN as recently as Q4 2025.

Citadel Advisors first reported a position in BLLN in Q4 2025 and has held it in 2 quarters since. The position peaked at $12.2M in Q4 2025. 156 funds tracked by Wall St. Rank hold BLLN as of Q2 2026.

  • Citadel Advisors held 15,155 shares of BillionToOne Inc worth $1.82M as of Q2 2026.
  • BillionToOne Inc was a new Citadel Advisors position in Q2 2026.
  • BillionToOne Inc made up ﹤0.01% of Citadel Advisors's portfolio in Q2 2026, its #6767 holding.
  • Citadel Advisors first reported a position in BillionToOne Inc in Q4 2025 and has held it in 2 quarters since.
  • Citadel Advisors's BillionToOne Inc position peaked at $12.2M in Q4 2025.
  • 156 funds tracked by Wall St. Rank held BillionToOne Inc as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.