Intertwined　supply　network　(ISN)　is　a　complex　system　consisting　of　multiple　interconnected　supply　chains　orchestrated　by　different　focal　firms.　The　inherent　interconnectedness　of　an　ISN　makes　it　vulnerable　to　localized　disruptions,　which　can　propagate　through　intricate　supplier-buyer　relationships,　causing　unpredictable　disruption　ripple　effects　that　exacerbate　vulnerabilities.　While　existing　literature　provides　valuable　insights　into　the　vulnerability　of　supply　networks　with　a　single　focal　firm,　less　attention　has　been　given　to　ISN　comprising　multiple　competing　focal　firms.　This　study　proposes　an　agent-based　model　to　simulate　the　diffusion　of　disruption　ripple　effects　in　a　realistic　ISN.　The　model　is　used　to　assess　the　relative　effects　of　firms＇　structural　and　operational　attributes　on　vulnerability　and　to　compare　the　effectiveness　of　three　mainstream　resilience　strategies-resistance,　adaptation,　and　recovery-in　mitigating　the　overall　vulnerability　of　ISN.　Furthermore,　the　interaction　of　resilience　strategies　initiated　by　different　focal　firms　in　the　ISN　is　explored.　The　results　suggest　that　focal　firms　should　prioritize　their　own　structural　attributes　and　those　of　their　neighboring　firms　to　address　vulnerabilities　effectively.　Moreover,　focal　firms　can　identify　partners　with　higher　reciprocity　and　engage　in　cooperation　for　resilience　investment.　This　study　contributes　to　the　understanding　of　ISN　vulnerability　and　provides　practical　insights　for　developing　effective　resilience　strategies　in　complex　supply　networks.