John Rogers - Ariel Investments,
Period:    Q1 2026
Portfolio date:    31 Mar 2026
No. of stocks:    106
Portfolio value:    $8,934,260,435
Holdings Activity Buys Sells    History
Holding/activity history for  Rubicon Technology Inc (RBCN)
Period Shares % of Portfolio Activity % Change to Portfolio Reported Price Value Filing
2021   Q3 0 0.00 Sell 100.00% <0.01 SEC
2021   Q2 21,551 <0.01 Reduce 59.94% <0.01 $9.51 $205,000 SEC
2021   Q1 53,798 0.01 Reduce 7.06% <0.01 $10.32 $555,000 SEC
2020   Q4 57,886 0.01 Add 1.40% <0.01 $9.05 $524,000 SEC
2020   Q3 57,087 0.01 $8.50 $485,000 SEC
2020   Q2 57,087 0.01 Reduce 14.24% <0.01 $8.13 $464,000 SEC
2020   Q1 66,568 0.01 Reduce 14.74% <0.01 $7.72 $514,000 SEC
2019   Q4 78,078 0.01 Reduce 27.72% <0.01 $8.33 $650,000 SEC
2019   Q3 108,015 0.01 Reduce 25.67% <0.01 $9.57 $1,034,000 SEC
2019   Q2 145,316 0.02 $8.30 $1,206,000 SEC
2019   Q1 145,316 0.01 Add 0.47% $8.07 $1,173,000 SEC
2018   Q4 144,635 0.02 Reduce 35.65% <0.01 $7.90 $1,143,000 SEC
2018   Q3 224,775 0.02 Add 4.51% <0.01 $8.98 $2,018,000 SEC
2018   Q2 215,083 0.02 Add 37.74% <0.01 $7.89 $1,697,000 SEC
2018   Q1 156,147 0.01 Reduce 14.59% <0.01 $6.95 $1,085,000 SEC
2017   Q4 182,827 0.02 Add 2.72% <0.01 $7.98 $1,459,000 SEC
2017   Q3 177,992 0.02 Reduce 1.28% <0.01 $8.26 $1,470,000 SEC
2017   Q2 180,297 0.02 Buy 0.02 $9.26 $1,670,000 SEC