Boundary Creek Advisors LP In its 13F for Q2 2024 (holdings as of June 30, 2024, filed August 9, 2024), Boundary Creek Advisors LP reported 16 stock positions worth $203.0 million . Its top holding was Mativ (MATV) at 22.6% of the portfolio, followed by Mercer International (MERC, 18.0% ) and Knight-Swift Transportation (KNX, 9.9% ). Compared with Q1 2024, it opened 8 new positions, sold out of 3, added to 3 and reduced 3. The biggest buy was a new position in Solaris Resources (SLSR) and the biggest sale Mativ (MATV, shares −12% ).
Location TUCKAHOE, NY
CIK 0001771944
Portfolio Value $203.0M (Q2 2024) Holdings 16 stocks · $203.0M 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 Q1 2024 MATV Mativ Holdings Inc. 2,710,477 $46.0M Reduce -12.1% MERC Mercer International Inc. 4,288,901 $36.6M Reduce -5.8% KNX Knight-Swift Transportation 401,210 $20.0M Add +166.9% AMBP Ardagh Metal Packaging SA 5,633,666 $19.2M Add +74.3% SLSR Solaris Resources Inc. 6,224,400 $17.4M New BRSL Brightstar Lottery PLC filed as INTERNATIONAL GAME TECHNOLOG 684,635 $14.0M Reduce -4.4% BALY Bally's Corp. 991,027 $11.9M Add +983.7% LEU Centrus Energy Corp. Class A 244,867 $10.5M New VST Vistra Corp. 88,234 $7.6M New UIS Unisys Corp. 1,611,652 $6.7M New DNN Denison Mines Corp. 2,342,600 $4.7M New OI O-I Glass Inc. 247,539 $2.8M New URBAN ONE INC 1,485,214 $2.2M No change URG Ur-Energy Inc. 1,506,000 $2.1M New EU Encore Energy Corp. 324,600 $1.3M New URBAN ONE INC 104,756 $208K No change
Options reported separately and not counted above: SPY puts ($571.4M), IWM puts ($202.9M), KNX calls ($49.9M), MATV calls ($21.2M), JELD calls ($13.5M), MPT puts ($8.6M), MERC calls ($7.6M), CRK puts ($5.2M), AMBP calls ($2.6M), OPTU calls ($2.0M).
Other holdings (3): bonds, preferreds, convertibles and warrants · $7.0M (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 $7.0M No change SLNWF Selina Hospitality PLC-27 *W EXP 10/27/202 200,000 $3K No change VEEAW Plum Acquisition I A -CW28 *W EXP 03/18/202 28,083 $2K No change
Total filed on the 13F, all lines: $210.0M.
Portfolio Sells Q1 2024 → Q2 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 Q1 2024 % Of Portfolio Change To Portfolio ▲ MATV Mativ Holdings Inc. Reduce -12.1% 22.65% −16.72 MERC Mercer International Inc. Reduce -5.8% 18.04% −12.82 BRSL Brightstar Lottery PLC Reduce -4.4% 6.90% −4.12 NGD New Gold Inc. Sold out 0.00% −1.29 GLATFELTER CORP Sold out 0.00% −0.79 GFR Greenfire Resources Ltd. Sold out 0.00% −0.36
Portfolio Buys Q1 2024 → Q2 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 Q1 2024 % Of Portfolio Change To Portfolio ▼ SLSR Solaris Resources Inc. New 8.56% +8.56 LEU Centrus Energy Corp. Class A New 5.16% +5.16 BALY Bally's Corp. Add +983.7% 5.84% +4.98 KNX Knight-Swift Transportation Add +166.9% 9.87% +4.23 VST Vistra Corp. New 3.74% +3.74 UIS Unisys Corp. New 3.28% +3.28 DNN Denison Mines Corp. New 2.31% +2.31 AMBP Ardagh Metal Packaging SA Add +74.3% 9.44% +1.89 OI O-I Glass Inc. New 1.36% +1.36 URG Ur-Energy Inc. New 1.04% +1.04 EU Encore Energy Corp. New 0.63% +0.63
Options Activity Q1 2024 → Q2 2024 Security Type Change vs Q1 2024 Underlying Shares Value ▼ SPY SS SPDR S&P 500 ETF Trust-US put Add +5.0% 1,050,000 $571.4M IWM iShares Russell 2000 ETF put Reduce -48.7% 1,000,000 $202.9M BA The Boeing Co. put Sold out 500,000 $96.5Mbefore exit DLR Digital Realty Trust Inc. put Sold out 550,000 $79.2Mbefore exit EMN Eastman Chemical Co. call Sold out 750,000 $75.2Mbefore exit SLVM Sylvamo Corp. put Sold out 1,000,000 $61.7Mbefore exit ABR Arbor Realty Trust Inc. put Sold out 4,506,800 $59.7Mbefore exit CHTR Charter Communications Inc. Class A put Sold out 200,000 $58.1Mbefore exit KNX Knight-Swift Transportation call New 1,000,000 $49.9M BRSL Brightstar Lottery PLC call Sold out 2,027,500 $45.8Mbefore exit MATV Mativ Holdings Inc. call Reduce -16.7% 1,250,000 $21.2M AL Sumisho Air Lease Corp. call Sold out 328,200 $16.9Mbefore exit BALY Bally's Corp. call Sold out 1,014,000 $14.1Mbefore exit JELD Jeld-Wen Holding Inc. call Add +49.3% 1,000,000 $13.5M MPT Medical Properties Trust Inc. put Add +100.0% 2,000,000 $8.6M MERC Mercer International Inc. call Add +7.0% 890,300 $7.6M CRK Comstock Resources Inc. put New 500,000 $5.2M MAIN Main Street Capital Corp. put Sold out 100,000 $4.7Mbefore exit AMBP Ardagh Metal Packaging SA call New 754,100 $2.6M OPTU Optimum Communications Inc. Class A call Reduce -20.0% 1,000,000 $2.0M
Calls and puts are listed by the shares they cover; their value is not part of the stock holdings 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