Diameter Capital Partners LP: MASTERBRAND INC (MBC): Quarterly 13F Position History
As of Q2 2026, Diameter Capital Partners LP reported 4,779,445 shares of MASTERBRAND INC (MBC), worth $49.2M and representing 5.2% of its 13F equity book. Quarter-over-quarter share count change: + 3,233,874 (+209.2%) . The position first appeared in Q2 2025 and has been disclosed across 5 13F-HR filings in Pactolio's tracked window.
- 4,779,445Shares Held (Latest Filing)
- $49.2MReported Market Value (Latest Filing)
- 5.2%Portfolio Weight (% of 13F Equity Book)
- +3,233,874Quarter-over-Quarter Share Change
- +$36.3MQuarter-over-Quarter Value Change
- 6,010,410Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 5 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q2 2026 | 4,779,445 | +3,233,874 | +209.2% | $49.2M | 5.2% | $10.3 |
| Q1 2026 | 1,545,571 | 4,464,839 | -74.3% | $12.8M | 2.5% | $8.3 |
| Q4 2025 | 6,010,410 | +950,000 | +18.8% | $66.4M | 6.9% | $11.0 |
| Q3 2025 | 5,060,410 | +4,060,410 | +406.0% | $66.6M | 7.0% | $13.2 |
| Q2 2025 | 1,000,000 | – | – | $10.9M | 3.0% | $10.9 |
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 Diameter Capital Partners LP first disclose a MBC position in 13F-HR filings?
Diameter Capital Partners LP first reported MASTERBRAND INC (MBC) on its 13F-HR filing for the period ending 2025-06-30 (Q2 2025). The position has appeared on 5 reported quarters within Pactolio's tracked window.
What was Diameter Capital Partners LP's most recent quarter-over-quarter share-count change in MBC?
Between Q1 2026 and Q2 2026, Diameter Capital Partners LP added 3,233,874 shares of MBC (+209.2%), bringing the total reported position to 4,779,445 shares at a market value of $49.2M.
Does the implied price-per-share represent Diameter Capital Partners LP's cost basis in MBC?
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.