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Of the 9 tracked institutions holding MBX, 3 have a 3-year clone track record — 3 of them beat the S&P. Average holder's clone alpha: +4.5pt. It's a gauge of who owns the name, not just how many.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
Among the 9 tracked institutional investors we monitor, MBX (MBX BIOSCIENCES INC) is held with a combined value of $427.80M across 14,228,575 shares. The largest holder is WELLINGTON MANAGEMENT GROUP LLP with a position worth $95.28M (0.02% of their portfolio). 7 funds increased their holdings. 2 funds reduced their position.
Total Institutional Value
$427.80M
Total Shares Held
14,228,575
Institutional Holders
9
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | WELLINGTON MANAGEMENT GROUP LLP | $95.28M | 0.02% | -4.7% |
| 2 | BlackRock, Inc. | $87.80M | 0.00% | +0.7% |
| 3 | FMR LLC | $87.66M | 0.00% | +18550.3% |
| 4 | VANGUARD GROUP INC | $57.33M | 0.00% | +8.4% |
| 5 | PRICE T ROWE ASSOCIATES INC /MD/ | $30.72M | 0.00% | +22.4% |
| 6 | CITADEL ADVISORS LLC | $27.85M | 0.02% | +15.2% |
| 7 | STATE STREET CORP | $23.50M | 0.00% | +17.0% |
| 8 | MILLENNIUM MANAGEMENT LLC | $16.85M | 0.01% | +22.2% |
| 9 | AQR CAPITAL MANAGEMENT LLC | $817.50K | 0.00% | -12.8% |
As of the latest SEC 13F filings, WELLINGTON MANAGEMENT GROUP LLP is the largest institutional holder of MBX with a position worth $95.28M, representing 0.02% of their portfolio. In total, 9 institutional investors hold MBX with a combined value of $427.80M.
Institutional investors hold $427.80M worth of MBX stock across 9 positions. The largest institutional holder is WELLINGTON MANAGEMENT GROUP LLP with $95.28M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MBX, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their MBX positions.
Last Close
$61.30
2026-07-27
YTD
+100.7%
92% of 52-week range
