Boundary Creek Advisors LP In its 13F for Q1 2024 (holdings as of March 31, 2024, filed May 7, 2024), Boundary Creek Advisors LP reported 11 stock positions worth $146.8 million . Its top holding was Mativ (MATV) at 39.4% of the portfolio, followed by Mercer International (MERC, 30.9% ) and Brightstar Lottery (BRSL, 11.0% ). Compared with Q4 2023, it opened 2 new positions, sold out of 3, added to 3 and reduced 4. The biggest buy was Mativ (MATV, shares +159% ) and the biggest sale an exit from Hudbay Minerals (HBM).
Location TUCKAHOE, NY
CIK 0001771944
Portfolio Value $146.8M (Q1 2024) Holdings 11 stocks · $146.8M Holdings quarter Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024
Stock % Of Portfolio ▼ Shares Held Total Value Change vs Q4 2023 MATV Mativ Holdings Inc. 3,082,999 $57.8M Add +159.1% MERC Mercer International Inc. 4,555,180 $45.3M Add +12.7% BRSL Brightstar Lottery PLC filed as INTERNATIONAL GAME TECHNOLOG 716,254 $16.2M Add +36.6% AMBP Ardagh Metal Packaging SA 3,232,459 $11.1M No change KNX Knight-Swift Transportation 150,300 $8.3M New URBAN ONE INC 1,485,214 $3.0M Reduce -0.3% NGD New Gold Inc. 1,124,400 $1.9M No change BALY Bally's Corp. 91,449 $1.3M New GLATFELTER CORP 577,910 $1.2M Reduce -40.9% GFR Greenfire Resources Ltd. 89,080 $532K Reduce -64.7% URBAN ONE INC 104,756 $283K Reduce -10.0%
Options reported separately and not counted above: SPY puts ($523.1M), IWM puts ($410.1M), BA puts ($96.5M), DLR puts ($79.2M), EMN calls ($75.2M), SLVM puts ($61.7M), ABR puts ($59.7M), CHTR puts ($58.1M), BRSL calls ($45.8M), MATV calls ($28.1M), AL calls ($16.9M), JELD calls ($14.2M), and 5 more.
Other holdings (3): bonds, preferreds, convertibles and warrants · $7.1M (not counted above) Security Class Shares / Principal Value Change LENDINGTREE INC (TREE 0.5 07/15/25) NOTE 0.500% 7/1 · principal 7,600,000 $7.1M No change VEEAW Plum Acquisition I A -CW28 *W EXP 03/18/202 28,083 $11K No change SLNWF Selina Hospitality PLC-27 *W EXP 10/27/202 200,000 $2K No change
Total filed on the 13F, all lines: $153.9M.
Portfolio Sells Q4 2023 → Q1 2024 Portfolio Sells quarter Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024
Stock Change vs Q4 2023 % Of Portfolio Change To Portfolio ▲ HBM Hudbay Minerals Inc. Sold out 0.00% −9.85 LSXMK Liberty Media Corp.-Liber-New Sold out 0.00% −6.97 URBAN ONE INC Reduce -0.3% 2.06% −2.46 LLYVK Liberty Media Corp.-Liberty-C Sold out 0.00% −2.41 GLATFELTER CORP Reduce -40.9% 0.79% −0.85 GFR Greenfire Resources Ltd. Reduce -64.7% 0.36% −0.69 URBAN ONE INC Reduce -10.0% 0.19% −0.21
Portfolio Buys Q4 2023 → Q1 2024 Portfolio Buys quarter Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024
Stock Change vs Q4 2023 % Of Portfolio Change To Portfolio ▼ MATV Mativ Holdings Inc. Add +159.1% 39.37% +23.68 KNX Knight-Swift Transportation New 5.63% +5.63 BALY Bally's Corp. New 0.87% +0.87 BRSL Brightstar Lottery PLC Add +36.6% 11.02% −1.36 MERC Mercer International Inc. Add +12.7% 30.87% −2.12
Options Activity Q4 2023 → Q1 2024 Security Type Change vs Q4 2023 Underlying Shares Value ▼ SPY SS SPDR S&P 500 ETF Trust-US put Reduce -60.0% 1,000,000 $523.1M HYG Ishr Ibx Usd Hiyld CB ETF-Ui put Sold out 6,600,000 $510.8Mbefore exit IWM iShares Russell 2000 ETF put Add +30.0% 1,950,000 $410.1M BA The Boeing Co. put New 500,000 $96.5M DLR Digital Realty Trust Inc. put Reduce -35.3% 550,000 $79.2M EMN Eastman Chemical Co. call New 750,000 $75.2M SLVM Sylvamo Corp. put New 1,000,000 $61.7M ABR Arbor Realty Trust Inc. put Add +138.2% 4,506,800 $59.7M CHTR Charter Communications Inc. Class A put New 200,000 $58.1M MOS The Mosaic Co. call Sold out 1,401,000 $50.1Mbefore exit ACM Aecom put Sold out 500,000 $46.2Mbefore exit BRSL Brightstar Lottery PLC call Add +100.7% 2,027,500 $45.8M MATV Mativ Holdings Inc. call Reduce -42.5% 1,500,000 $28.1M RXO Rxo Inc. put Sold out 750,000 $17.4Mbefore exit AL Sumisho Air Lease Corp. call New 328,200 $16.9M JELD Jeld-Wen Holding Inc. call New 669,700 $14.2M BALY Bally's Corp. call Reduce -6.1% 1,014,000 $14.1M CDE Coeur Mining Inc. call Sold out 3,750,000 $12.2Mbefore exit CCL Carnival Corp. put Sold out 500,000 $9.3Mbefore exit MERC Mercer International Inc. call Reduce -48.6% 831,700 $8.3M DXC DXC Technology Co. call Sold out 250,000 $5.7Mbefore exit SIRI Sirius XM Holdings Inc. call Sold out 1,000,000 $5.5Mbefore exit MAIN Main Street Capital Corp. put New 100,000 $4.7M MPT Medical Properties Trust Inc. put New 1,000,000 $4.7M DLX Deluxe Corp. call Sold out 175,000 $3.8Mbefore exit OPTU Optimum Communications Inc. Class A call Reduce -55.6% 1,250,000 $3.3M HBM Hudbay Minerals Inc. call Sold out 290,600 $1.6Mbefore exit
Calls and puts are listed by the shares they cover; their value is not part of the stock holdings above.
Notes & Other Activity Q4 2023 → Q1 2024 Bonds, preferreds, convertibles and warrants; not part of the stock holdings or percentages above.
All Filings Quarter Positions 13F Reported Value Top Holdings Q2 2026 0 $0 Q1 2026 1 $15.3M GBTG Q4 2025 1 $20.9M GBTG Q3 2025 1 $22.9M GBTG Q2 2025 3 $39.9M SLSR, MATV, MERC Q1 2025 11 $109.7M SLSR, MERC, KNX, MATV, LEU Q4 2024 11 $149.4M MERC, MATV, KNX, SLSR, LEU Q3 2024 9 $152.7M MATV, MERC, SLSR, LEU, KNX Q2 2024 16 $203.0M MATV, MERC, KNX, AMBP, SLSR Q1 2024 11 $146.8M MATV, MERC, BRSL, AMBP, KNX