Ioneer
IONR
23 hedge funds and large institutions have $2.36M invested in Ioneer in 2025 Q4 according to their latest regulatory filings, with 12 funds opening new positions, 4 increasing their positions, 4 reducing their positions, and 2 closing their positions.
500% more first-time investments, than exits
New positions opened: 12 | Existing positions closed: 2
304% more capital invested
Capital invested by funds: $583K → $2.36M (+$1.77M)
77% more funds holding
Funds holding: 13 → 23 (+10)
0.54% more ownership
Funds ownership: 0.2% → 0.74% (+0.54%)
0% more repeat investments, than reductions
Existing positions increased: 4 | Existing positions reduced: 4
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Marshall Wace
London,
United Kingdom
|
+$810K |
| 2 |
Citadel Advisors
Miami,
Florida
|
+$279K |
| 3 |
Morgan Stanley
New York
|
+$252K |
| 4 |
VF
Virtu Financial
New York
|
+$98.4K |
| 5 |
Millennium Management
New York
|
+$97.8K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Jane Street
New York
|
-$66.4K |
| 2 |
LPL Financial
San Diego,
California
|
-$50K |
| 3 |
Mariner
Overland Park,
Kansas
|
-$44.7K |
| 4 |
GWM
GK Wealth Management
Reno,
Nevada
|
-$37.9K |
| 5 |
EWA
EverSource Wealth Advisors
Birmingham,
Alabama
|
-$5.07K |
IONR Hedge Fund Activity: Q4 2025 in Review
23 of the 8,280 institutional investors tracked by Wall St. Rank reported a position in Ioneer (IONR) for Q4 2025, worth a combined $2.36M — up 304% from $583K a quarter earlier.
Buyers outnumbered sellers: 12 funds opened new IONR positions and 2 closed out — a net gain of 10 holders — while 4 added to existing stakes and 4 trimmed.
The largest buyer was Marshall Wace, opening a new position worth an estimated $810K. The largest seller was Jane Street, cutting an estimated $66.4K.
- 23 institutional investors held Ioneer (IONR) as of Q4 2025, up from 13 in Q3 2025.
- Funds reported $2.36M of Ioneer stock for Q4 2025, up 304% quarter-over-quarter.
- 12 funds opened new Ioneer positions in Q4 2025 and 2 closed out, a net change of +10 holders.
- The largest Ioneer buyer in Q4 2025 was Marshall Wace, an estimated $810K added.
- The largest Ioneer seller in Q4 2025 was Jane Street, an estimated $66.4K sold.
Based on aggregated 13F filings for Q4 2025.