13FBOX
ARM HOLDINGS PLC · 13F Institutional Holdings
Options Calculator Rankings
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ARM HOLDINGS PLC

ARM
Institutions
13
Combined AUM (Q2 2026)
$1.81B
Combined Shares (Q2 2026)
5.1M
Overall Trend
Increase
All institutions combined
Basis: holder count and combined value / shares merge all share classes of the same company (e.g. Class A / C); each institution is counted once, and value & shares are the sum across classes.
📥 Inflow (Q1 2026→Q2 2026)
+643,018
6 institutions added · 1 new buys
Est. buy amount
📤 Outflow (Q1 2026→Q2 2026)
-579,200
7 institutions reduced · 1 exits
Est. sell amount
⚖️ Net Share Change
+63,818
Net Buy
💰 Est. Net Value
≈ —
est. price
Latest AUM (Q2 2026)
$1.81B
Institutions
13
New Buys
1
Adds
5
Reduces
6
Exits
1
Unchanged
1
Ownership TrendPortfolio %Prev Q %RankQ2 2026 ValueQ2 2026 SharesPrev Q ValuePrev Q SharesShares ChangeAction
IMC-Chicago, LLC
0.2%0.13%#3$839.2M2.4M$356.7M2.4M+8,900+0.38%Add
GROUP ONE TRADING LLC
0.37%0.24%#2$268.6M757,600$127.4M842,100-84,500-10.03%Reduce
Optiver Holding B.V.
0.06%0.01%#5$205.2M578,600$27.6M182,400+396,200+217.21%Add
SIMPLEX TRADING, LLC
0.11%0.06%#4$177.2M499,800$86.3M570,400-70,600-12.38%Reduce
JPMORGAN CHASE & CO
0.01%<0.01%#9$161.9M471,100$56.5M412,500+58,600+14.21%Add
SG Americas Securities, LLC
0.04%<0.01%#8$79.1M223,200$27379,800+143,400+179.70%Add
CMT Capital Markets Trading GmbH
0.56%0.29%#1$72.9M205,700$25.7M169,800+35,900+21.14%Add
Capital Markets Trading UK LLP
0.05%0.15%#6$4.8M13,500$10.0M66,000-52,500-79.55%Reduce
HRT FINANCIAL LP
0.01%0.1%#10$4.5M12,600$39.6M261,900-249,300-95.19%Reduce
DV Trading LLC
0.05%0.41%#7$1.4M3,900$17.5M115,700-111,800-96.63%Reduce
Marathon Trading Investment Management LLC
<0.01%0.03%#12$35,457100$1.3M8,300-8,200-98.80%Reduce
PIAR LLC
<0.01%#11$6,39018$00+18New Buy
OSAIC HOLDINGS, INC.
<0.01%<0.01%#13$3551$7,065100.00%Unchanged

🧭 Institutional Sector Flow Heatmap

Net Outflow Net Inflow