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Custom Index Systems’s Aon AON Stock Holding History

Custom Index Systems’s Portfolio AON Stock Details AON Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$428K Buy
1,326
+498
+60% +$166K 0.19% 155
2025
Q4 		$292K Hold
828
– – 0.13% 199
2025
Q3 		$295K Hold
828
– – 0.09% 224
2025
Q2 		$295K Buy
828
+113
+16% +$40.9K 0.14% 196
2025
Q1 		$285K Buy
+715
New +$274K 0.14% 211

Other funds holding AON

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return
Dodge & Cox
Dodge & Cox San Francisco, California $182B AUM 14.68% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Custom Index Systems's AON Position: Q1 2026 in Review

Custom Index Systems increased its Aon (AON) stake by 60% in Q1 2026, buying an estimated $166K and bringing the position to 1,326 shares worth $428K. The position accounts for 0.19% of the portfolio, ranked #155.

Custom Index Systems first reported a position in AON in Q1 2025 and has held it in 5 quarters since. 1,252 funds tracked by Wall St. Rank hold AON as of Q1 2026.

  • Custom Index Systems held 1,326 shares of Aon worth $428K as of Q1 2026.
  • Custom Index Systems bought 498 Aon shares in Q1 2026, an estimated $166K.
  • Aon made up 0.19% of Custom Index Systems's portfolio in Q1 2026, its #155 holding.
  • Custom Index Systems first reported a position in Aon in Q1 2025 and has held it in 5 quarters since.
  • 1,252 funds tracked by Wall St. Rank held Aon as of Q1 2026.

Based on Custom Index Systems's 13F filing for Q1 2026, filed 29 Apr 2026.