William John Sempolinski
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William John Sempolinski’s GRAIL Inc GRAL Stock Holding History

William John Sempolinski’s Portfolio GRAL Stock Details GRAL Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q3 		$1.9M Buy
13,525
+6,375
+89% +$506K 0.73% 31
2026
Q2 		$488K Buy
+7,150
New +$421K 0.2% 71
2026
Q1 		– Sell
-17,975
Closed -$1.54M – 99
2025
Q4 		$1.54M Buy
+17,975
New +$1.55M 0.76% 29

Other funds holding GRAL

BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $161B AUM 86.05% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
Morgan Stanley
Morgan Stanley New York $1.96T AUM 27.49% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return
Arbiter Partners Capital Management
Arbiter Partners Capital Management New York $235M AUM 94.74% 1-Year Est. Return
Jefferies Financial Group
Jefferies Financial Group New York $13.5B AUM 36.68% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.21T AUM

William John Sempolinski's GRAL Position: Q3 2026 in Review

William John Sempolinski increased its GRAIL Inc (GRAL) stake by 89% in Q3 2026, buying an estimated $506K and bringing the position to 13,525 shares worth $1.9M. The position accounts for 0.73% of the portfolio, ranked #31.

William John Sempolinski first reported a position in GRAL in Q4 2025 and has held it in 3 quarters since. 344 funds tracked by Wall St. Rank hold GRAL as of Q3 2026.

  • William John Sempolinski held 13,525 shares of GRAIL Inc worth $1.9M as of Q3 2026.
  • William John Sempolinski bought 6,375 GRAIL Inc shares in Q3 2026, an estimated $506K.
  • GRAIL Inc made up 0.73% of William John Sempolinski's portfolio in Q3 2026, its #31 holding.
  • William John Sempolinski first reported a position in GRAIL Inc in Q4 2025 and has held it in 3 quarters since.
  • 344 funds tracked by Wall St. Rank held GRAIL Inc as of Q3 2026.

Based on William John Sempolinski's 13F filing for Q3 2026, filed 20 Oct 2026.