Diameter Capital Partners LP: ARDAGH METAL PACKAGING S A (AMBP): Quarterly 13F Position History
As of Q1 2026, Diameter Capital Partners LP reported 4,467,420 shares of ARDAGH METAL PACKAGING S A (AMBP), worth $18.1M and representing 3.5% of its 13F equity book. Quarter-over-quarter share count change: 908,946 (-16.9%) . The position first appeared in Q3 2021 and has been disclosed across 19 13F-HR filings in Pactolio's tracked window.
- 4,467,420Shares Held (Latest Filing)
- $18.1MReported Market Value (Latest Filing)
- 3.5%Portfolio Weight (% of 13F Equity Book)
- 908,946Quarter-over-Quarter Share Change
- -$4.0MQuarter-over-Quarter Value Change
- 5,805,216Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 19 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 4,467,420 | 908,946 | -16.9% | $18.1M | 3.5% | $4.0 |
| Q4 2025 | 5,376,366 | +286,553 | +5.6% | $22.0M | 2.3% | $4.1 |
| Q3 2025 | 5,089,813 | +3,215,692 | +171.6% | $20.3M | 2.1% | $4.0 |
| Q2 2025 | 1,874,121 | 2,750,000 | -59.5% | $8.0M | 2.2% | $4.3 |
| Q1 2025 | 4,624,121 | +250,000 | +5.7% | $14.0M | 3.3% | $3.0 |
| Q4 2024 | 4,374,121 | +400,000 | +10.1% | $13.2M | 2.5% | $3.0 |
| Q3 2024 | 3,974,121 | 916,062 | -18.7% | $15.0M | 3.2% | $3.8 |
| Q2 2024 | 4,890,183 | 0 | — | $16.6M | 3.9% | $3.4 |
| Q1 2024 | 4,890,183 | +980,300 | +25.1% | $16.8M | 2.8% | $3.4 |
| Q4 2023 | 3,909,883 | +2,257,762 | +136.7% | $15.0M | 3.7% | $3.8 |
| Q3 2023 | 1,652,121 | 97,353 | -5.6% | $5.2M | 2.0% | $3.1 |
| Q2 2023 | 1,749,474 | 0 | — | $6.6M | 2.8% | $3.8 |
| Q1 2023 | 1,749,474 | 632,000 | -26.5% | $7.1B | 4.5% | $4080.0 |
| Q4 2022 | 2,381,474 | 3,423,742 | -59.0% | $11.5B | 3.2% | $4810.0 |
| Q3 2022 | 5,805,216 | +132,599 | +2.3% | $28.1M | 6.7% | $4.8 |
| Q2 2022 | 5,672,617 | +1,166,050 | +25.9% | $34.6M | 7.1% | $6.1 |
| Q1 2022 | 4,506,567 | 519,485 | -10.3% | $36.6M | 4.4% | $8.1 |
| Q4 2021 | 5,026,052 | +2,026,052 | +67.5% | $45.4M | 4.2% | $9.0 |
| Q3 2021 | 3,000,000 | — | — | $29.9M | 3.5% | $10.0 |
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, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Diameter Capital Partners LP first disclose a AMBP position in 13F-HR filings?
Diameter Capital Partners LP first reported ARDAGH METAL PACKAGING S A (AMBP) on its 13F-HR filing for the period ending 2021-09-30 (Q3 2021). The position has appeared on 19 reported quarters within Pactolio's tracked window.
What was Diameter Capital Partners LP's most recent quarter-over-quarter share-count change in AMBP?
Between Q4 2025 and Q1 2026, Diameter Capital Partners LP reduced its AMBP position by 908,946 shares (-16.9%), leaving 4,467,420 shares at a market value of $18.1M.
Does the implied price-per-share represent Diameter Capital Partners LP's cost basis in AMBP?
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.