Ticker · CUSIP 077347300

BELFB

BEL FUSE INC

Technology·Electronic Components

···Share

Holders (tracked)

Combined shares

1,340,513

Combined value

$227.39M

Last close

$254.25

Quarter

2025Q4

Price is +49.9% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$254.25+184.16 (+262.74%)H $254.25 · L $65.61 · Avg Vol 153K

Position opened

Tracked holders · last 8 quarters

-1 vs previous quarter over the last 8.

SEC event timeline

12 events

Ken Griffin (Citadel Advisors) trimmed2026-02-17
−92,103 shares · 2025Q4
Position
AQR Capital Management added2026-02-17
+600 shares · 2025Q4
Position
Two Sigma Investments exited2026-02-17
−9,242 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) exited2026-02-17
−7,246 shares · 2025Q4
Position
T. Rowe Price added2026-02-17
+355,563 shares · 2025Q4
Position
Renaissance Technologies trimmed2026-02-12
−21,500 shares · 2025Q4
Position
Ken Fisher (Fisher Asset Mgmt) opened position2026-02-09
+251,608 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2025-11-14
−25,537 shares · 2025Q3
Position
Two Sigma Investments opened position2025-11-14
+9,242 shares · 2025Q3
Position
T. Rowe Price added2025-11-14
+325,724 shares · 2025Q3
Position
AQR Capital Management added2025-11-14
+812 shares · 2025Q3
Position
Renaissance Technologies trimmed2025-11-13
−30,600 shares · 2025Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for BELFB →

Follow-the-investor returns

If you'd copied each holder of BELFB…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Renaissance Technologies	2016Q1	$26.04	+876.5%	$58.8M
AQR Capital Management	2023Q4	$90.59	+180.7%	$1.2M
T. Rowe Price	2024Q2	$145.12	+75.2%	$212.1M
Ken Griffin (Citadel Advisors)	2021Q2	$149.58	+70.0%	$1.0M
Ken Griffin (Citadel Advisors)	2021Q2	$149.58	+70.0%	$1.0M
Ken Fisher (Fisher Asset Mgmt)	2024Q3	$162.38	+56.6%	$64.0M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions1

Ken Fisher (Fisher Asset Mgmt)
+251,608
$42.7M

Added to2

AQR Capital Management
+600
$102K
T. Rowe Price
+355,563
$60K

Trimmed2

Ken Griffin (Citadel Advisors)
−92,103
$15.6M
Renaissance Technologies
−21,500
$3.6M

Exited2

Two Sigma Investments
−9,242
$1.3M
Izzy Englander (Millennium Mgmt)
−7,246
$1.0M

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	9	1,703,418	$30.4M	—
2022Q2	10	1,638,465	$25.5M	+1
2022Q3	9	1,182,921	$29.9M	-1
2022Q4	10	1,058,973	$34.9M	+1
2023Q1	10	799,465	$30.0M	—
2023Q2	9	1,274,718	$73.2M	-1
2023Q3	9	1,264,706	$60.4M	—
2023Q4	7	1,246,521	$83.2M	-2
2024Q1	8	1,236,225	$74.6M	+1
2024Q2	7	1,195,904	$78.0M	-1
2024Q3	7	365,931	$28.7M	—
2024Q4	8	351,210	$29.0M	+1
2025Q1	5	338,016	$25.3M	-3
2025Q2	6	507,307	$49.6M	+1
2025Q3	7	855,733	$120.7M	+1
2025Q4	6	1,340,513	$227.4M	-1

Who owns BELFB

6 super-investors · 2025Q4

Tracked stake

1.34M

Combined value

$227M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New1Added2Trim3

#	Manager	Shares	Value	% of book	Last action
1	T. Rowe Price	834.3K	$142M	0.0%	Added+355.6K
2	Ken Fisher Fisher Asset Mgmt	251.6K	$43M	0.0%	New+251.6K
3	Renaissance Technologies	231.4K	$39M	0.1%	Trim−21.5K
4	Ken Griffin Citadel Advisors	14.5K	$2M	0.0%	Trim−92.1K
5	AQR Capital Management	4.8K	$822K	0.0%	Added+600
6	Ken Griffin Citadel Advisors	3.9K	$670K	0.0%	Trim−92.1K

Recent moves

20 transactions

TRIMKen Griffin (Citadel Advisors)
−92,103 · 2025Q4
ADDAQR Capital Management
+600 · 2025Q4
ADDT. Rowe Price
+355,563 · 2025Q4
SOLDTwo Sigma Investments
−9,242 · 2025Q4
SOLDIzzy Englander (Millennium Mgmt)
−7,246 · 2025Q4
TRIMRenaissance Technologies
−21,500 · 2025Q4
NEWKen Fisher (Fisher Asset Mgmt)
+251,608 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−25,537 · 2025Q3
ADDAQR Capital Management
+812 · 2025Q3
NEWTwo Sigma Investments
+9,242 · 2025Q3
ADDT. Rowe Price
+325,724 · 2025Q3
TRIMRenaissance Technologies
−30,600 · 2025Q3
ADDT. Rowe Price
+148,424 · 2025Q2
NEWIzzy Englander (Millennium Mgmt)
+32,783 · 2025Q2
TRIMAQR Capital Management
−581 · 2025Q2
TRIMRenaissance Technologies
−40,300 · 2025Q2
SOLDIzzy Englander (Millennium Mgmt)
−3,701 · 2025Q1
TRIMAQR Capital Management
−6,146 · 2025Q1
ADDRenaissance Technologies
+20,219 · 2025Q1
ADDT. Rowe Price
+547 · 2025Q1

Embed this chart

Paste this iframe anywhere to embed the live BELFB chart.

<iframe src="https://openstocks.me/embed/stocks/BELFB" width="100%" height="480" frameborder="0" loading="lazy" title="BELFB chart by OpenStocks" style="border:0;border-radius:12px;background:transparent"></iframe>

Preview: https://openstocks.me/embed/stocks/BELFB

Explore related topics