Ticker · CUSIP 344437405

FONR

FONAR CORP
···Share
Holders (tracked)
2
Combined shares
336,347
Combined value
$6.24M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
232024Q12025Q4

SEC event timeline

3 events
  1. Ken Griffin (Citadel Advisors) opened position2026-02-17
    +20,631 shares · 2025Q4
    Position
  2. Renaissance Technologies added2026-02-12
    +7,100 shares · 2025Q4
    Position
  3. Renaissance Technologies trimmed2025-11-13
    −6,900 shares · 2025Q3
    Position

Insider activity

No insider transactions in the last 30 days.
View full insider history for FONR →

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.
New positions1
Added to1
Trimmed0
—
Exited0
—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
6
$11.6M
2022Q2
6
$9.1M
2022Q3
3
$7K
2022Q4
4
$1.9M
2023Q1
3
$1.6M
2023Q2
3
$2.4M
2023Q3
3
$2.1M
2023Q4
3
$2.4M
2024Q1
3
$2.9M
2024Q2
4
$7.5M
2024Q3
2
$5.6M
2024Q4
1
$4.7M
2025Q1
1
$4.3M
2025Q2
1
$4.7M
2025Q3
1
$4.6M
2025Q4
2
$6.2M

Who owns FONR

2 super-investors · 2025Q4
Tracked stake
336.3K
shares
Combined value
$6M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added1
#ManagerSharesValue
1Renaissance Technologies315.7K$6M
2Ken Griffin
Citadel Advisors
20.6K$383K

Recent moves

20 transactions
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