diff --git a/P/PeriodicMatrices/Compat.toml b/P/PeriodicMatrices/Compat.toml
new file mode 100644
index 000000000000000..e0d0b38012b85c7
--- /dev/null
+++ b/P/PeriodicMatrices/Compat.toml
@@ -0,0 +1,13 @@
+[0]
+FFTW = "1"
+IRKGaussLegendre = "0.2"
+Interpolations = "0.15"
+LinearAlgebra = "1"
+Optim = "1.9.0-1"
+OrdinaryDiffEq = "5.72.2-6"
+PeriodicSchurDecompositions = "0.1.1-0.1"
+Primes = "0.5"
+QuadGK = "2.11.0-2"
+SLICOT_jll = "5.8.0-5"
+Symbolics = "4-6"
+julia = "1.10.0-1"
diff --git a/P/PeriodicMatrices/Deps.toml b/P/PeriodicMatrices/Deps.toml
new file mode 100644
index 000000000000000..3f51c9ee258673f
--- /dev/null
+++ b/P/PeriodicMatrices/Deps.toml
@@ -0,0 +1,12 @@
+[0]
+FFTW = "7a1cc6ca-52ef-59f5-83cd-3a7055c09341"
+IRKGaussLegendre = "58bc7355-f626-4c51-96f2-1f8a038f95a2"
+Interpolations = "a98d9a8b-a2ab-59e6-89dd-64a1c18fca59"
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+Optim = "429524aa-4258-5aef-a3af-852621145aeb"
+OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
+PeriodicSchurDecompositions = "e5aedecb-f6c0-4c91-b6ff-fbae4296f459"
+Primes = "27ebfcd6-29c5-5fa9-bf4b-fb8fc14df3ae"
+QuadGK = "1fd47b50-473d-5c70-9696-f719f8f3bcdc"
+SLICOT_jll = "545525a2-e20e-568b-b87f-b40a06098995"
+Symbolics = "0c5d862f-8b57-4792-8d23-62f2024744c7"
diff --git a/P/PeriodicMatrices/Package.toml b/P/PeriodicMatrices/Package.toml
new file mode 100644
index 000000000000000..184645417c00641
--- /dev/null
+++ b/P/PeriodicMatrices/Package.toml
@@ -0,0 +1,3 @@
+name = "PeriodicMatrices"
+uuid = "dd9cd634-6083-4ae5-8f2e-b983833de2bb"
+repo = "https://github.com/andreasvarga/PeriodicMatrices.jl.git"
diff --git a/P/PeriodicMatrices/Versions.toml b/P/PeriodicMatrices/Versions.toml
new file mode 100644
index 000000000000000..49f14358fdc84b4
--- /dev/null
+++ b/P/PeriodicMatrices/Versions.toml
@@ -0,0 +1,2 @@
+["0.1.0"]
+git-tree-sha1 = "f56ad293b9f7b9dbba76e34d1f1c072d5f47861b"
diff --git a/P/PeriodicMatrices/WeakCompat.toml b/P/PeriodicMatrices/WeakCompat.toml
new file mode 100644
index 000000000000000..2b1f2461f4972da
--- /dev/null
+++ b/P/PeriodicMatrices/WeakCompat.toml
@@ -0,0 +1,2 @@
+[0]
+ApproxFun = "0.13"
diff --git a/P/PeriodicMatrices/WeakDeps.toml b/P/PeriodicMatrices/WeakDeps.toml
new file mode 100644
index 000000000000000..4fac341bba727b5
--- /dev/null
+++ b/P/PeriodicMatrices/WeakDeps.toml
@@ -0,0 +1,2 @@
+[0]
+ApproxFun = "28f2ccd6-bb30-5033-b560-165f7b14dc2f"
diff --git a/Registry.toml b/Registry.toml
index fe4ddbcb2fc2ce8..78a327758c8bdbe 100644
--- a/Registry.toml
+++ b/Registry.toml
@@ -10055,6 +10055,7 @@ dd871ef8-c280-11e9-0edd-21d59c0cc143 = { name = "InterpolatedPDFs", path = "I/In
 dd9280a6-c536-421c-a236-ce8c2c5b1b8d = { name = "MultivariateDiscretization", path = "M/MultivariateDiscretization" }
 dd94201c-7435-5bf3-a1a1-33dc1dbf1631 = { name = "ZITSOL_1_jll", path = "jll/Z/ZITSOL_1_jll" }
 dd99e9e3-7471-40fc-b48d-a10501125371 = { name = "PowerFlowData", path = "P/PowerFlowData" }
+dd9cd634-6083-4ae5-8f2e-b983833de2bb = { name = "PeriodicMatrices", path = "P/PeriodicMatrices" }
 ddafc8f7-a63f-59b6-bd98-72f6e6fe0966 = { name = "log4cplus_jll", path = "jll/L/log4cplus_jll" }
 ddb6d928-2868-570f-bddf-ab3f9cf99eb6 = { name = "YAML", path = "Y/YAML" }
 ddbd5806-ef7f-4d49-a7ae-17d1ec4329d7 = { name = "SignalTablesInterface_GLMakie", path = "S/SignalTablesInterface_GLMakie" }