Tetragon Partners GP Ltd: MBX BIOSCIENCES INC (MBX): Quarterly 13F Position History
As of Q2 2026, Tetragon Partners GP Ltd reported 203,543 shares of MBX BIOSCIENCES INC (MBX), worth $11.2M and representing 1.8% of its 13F equity book. Quarter-over-quarter share count change: + 58,063 (+39.9%) . The position first appeared in Q3 2025 and has been disclosed across 4 13F-HR filings in Pactolio's tracked window.
- 203,543Shares Held (Latest Filing)
- $11.2MReported Market Value (Latest Filing)
- 1.8%Portfolio Weight (% of 13F Equity Book)
- +58,063Quarter-over-Quarter Share Change
- +$6.9MQuarter-over-Quarter Value Change
- 203,543Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 4 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q2 2026 | 203,543 | +58,063 | +39.9% | $11.2M | 1.8% | $55.2 |
| Q1 2026 | 145,480 | +2,153 | +1.5% | $4.3M | 0.9% | $29.9 |
| Q4 2025 | 143,327 | 34,513 | -19.4% | $4.5M | 1.0% | $31.5 |
| Q3 2025 | 177,840 | – | – | $3.1M | 0.5% | $17.5 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares, a quarter-end mark rather than the manager's cost basis. See the full methodology document for the normalization rules.
When did Tetragon Partners GP Ltd first disclose a MBX position in 13F-HR filings?
Tetragon Partners GP Ltd first reported MBX BIOSCIENCES INC (MBX) on its 13F-HR filing for the period ending 2025-09-30 (Q3 2025). The position has appeared on 4 reported quarters within Pactolio's tracked window.
What was Tetragon Partners GP Ltd's most recent quarter-over-quarter share-count change in MBX?
Between Q1 2026 and Q2 2026, Tetragon Partners GP Ltd added 58,063 shares of MBX (+39.9%), bringing the total reported position to 203,543 shares at a market value of $11.2M.
Does the implied price-per-share represent Tetragon Partners GP Ltd's cost basis in MBX?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.