MBX BIOSCIENCES INC (MBX) is held by 92 institutional investors that disclose positions via SEC 13F filings. The largest disclosed holder is WELLINGTON MANAGEMENT GROUP LLP as of Q1 2026.

Are institutions buying or selling MBX?

In Q1 2026, 58 institutions opened or increased positions in MBX BIOSCIENCES INC while 38 reduced or exited — a net buying quarter.

What is the Smart Money Verdict on MBX?

The Smart Money Verdict combines four independent sources (institutional 13F activity, insider trades, activist filings, and congressional trades) into a single assessment for MBX BIOSCIENCES INC.

How many hedge funds hold MBX?

92 institutional investors report holding MBX BIOSCIENCES INC (MBX) as of Q1 2026, based on SEC 13F filings.

Is institutional money flowing into MBX?

As of Q1 2026, tracked institutions in MBX BIOSCIENCES INC show 58 buyers versus 38 sellers — net inflows.

MBX BIOSCIENCES INC

MBX·55287L101·US·Common Stock·Healthcare - Biotechnology-Activist

Holders

Avg rating(16 Elite)

$664.1M

Total Value

60% (100)

Fund Consensus

58 buying - 38 selling

Smart Money Verdict

View all

Held by 92 funds

16 elite

Who's Trading

Activist

FMR LLC11.2%Jul 8, 2026

Activist

Wellington Management Group LLP10.5%Jul 8, 2026

ActivistPBParadigm BioCapital Advisors LP5.2%Jun 24, 2026

InsiderASAzoulay SalomonExercise 55K shMay 8, 2026

InsiderASAzoulay SalomonExercise 15K shMay 8, 2026

InsiderASAzoulay SalomonSell $2.1MMay 8, 2026

InsiderASAzoulay SalomonSell $575KMay 8, 2026

InsiderHKHawryluk P. KentSell $18KMay 6, 2026

InsiderASAzoulay SalomonSell $7KMay 6, 2026

Activist

FMR LLC6.2%May 6, 2026

View all insider trades View all activist filings

13F: Mar 31, 2026Insider & Congress: Updated regularly

Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
WELLINGTON MANAGEMENT GROUP LLP	Decreased	3.2M(-4.7%)	$95.3M	0.0%	+194.01%	0
BlackRock, Inc.	Increased	2.9M(+0.7%)	$87.8M	0.0%	+183.74%	30
FMR LLC	Increased	2.9M(+186x)	$87.7M	0.0%	+100.51%	48
Polar Capital Holdings Plc	New	1.6M	$48.4M	0.2%	+99.90%	48
VAVANGUARD CAPITAL MANAGEMENT LLC	New	1.5M	$44.1M	0.0%	+99.90%	40
PRICE T ROWE ASSOCIATES INC /MD/	Increased	1M(+22.4%)	$30.7M	0.0%	+163.28%	35
DRIEHAUS CAPITAL MANAGEMENT LLC	Decreased	1M(-27.7%)	$30.4M	0.2%	+181.89%	0
CITADEL ADVISORS LLC	Increased	932,833(+15.2%)	$27.8M	0.0%	+211.46%	33
Woodline Partners LP	Decreased	900,063(-10.0%)	$26.9M	0.1%	+236.94%	0
STATE STREET CORP	Increased	787,208(+17.0%)	$23.5M	0.0%	+150.86%	33
GEODE CAPITAL MANAGEMENT, LLC	Increased	670,385(+3.2%)	$20M	0.0%	+190.87%	29
MILLENNIUM MANAGEMENT LLC	Increased	564,415(+22.1%)	$16.8M	0.0%	+264.67%	34
GOLDMAN SACHS GROUP INC	Increased	457,945(+38.0%)	$13.7M	0.0%	+185.19%	37
UBS Group AG	Increased	346,914(+23.4%)	$10.4M	0.0%	+114.29%	34
Candriam S.C.A.	New	294,374	$8.8M	0.0%	+99.90%	38
VPVANGUARD PORTFOLIO MANAGEMENT LLC	New	293,295	$8.8M	0.0%	+99.90%	38
DED. E. Shaw & Co., Inc.	Decreased	288,889(-57.0%)	$8.6M	0.0%	+97.57%	0
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	Decreased	214,908(-3.3%)	$6.4M	0.0%	+197.87%	0
NORTHERN TRUST CORP	Increased	210,575(+10.3%)	$6.3M	0.0%	+181.10%	30
VFVANGUARD FIDUCIARY TRUST CO	New	170,154	$5.1M	0.0%	+99.90%	37