diff --git a/src/kinds.jl b/src/kinds.jl
index 6de2f26a..4b24d98b 100644
--- a/src/kinds.jl
+++ b/src/kinds.jl
@@ -112,8 +112,11 @@ const _kind_names =
     "BEGIN_ASSIGNMENTS"
         "="
         "+="
+        "+%="
         "-="   # Also used for "−="
+        "-%="
         "*="
+        "*%="
         "/="
         "//="
         "|="
@@ -121,8 +124,11 @@ const _kind_names =
         "÷="
         "%="
         "<<="
+        "<<%="
         ">>="
+        ">>%="
         ">>>="
+        ">>>%="
         "\\="
         "&="
         ":="
@@ -623,7 +629,9 @@ const _kind_names =
     "BEGIN_PLUS"
         "\$"
         "+"
+        "+%"
         "-" # also used for "−"
+        "-%"
         "++"
         "⊕"
         "⊖"
@@ -684,6 +692,7 @@ const _kind_names =
     # Level 10
     "BEGIN_TIMES"
         "*"
+        "*%"
         "/"
         "÷"
         "%"
@@ -773,6 +782,9 @@ const _kind_names =
         "<<"
         ">>"
         ">>>"
+        "<<%"
+        ">>%"
+        ">>>%"
     "END_BITSHIFTS"
 
     # Level 13
diff --git a/src/tokenize.jl b/src/tokenize.jl
index 9c19c040..0085908a 100644
--- a/src/tokenize.jl
+++ b/src/tokenize.jl
@@ -796,11 +796,23 @@ function lex_greater(l::Lexer)
         if accept(l, '>')
             if accept(l, '=')
                 return emit(l, K">>>=")
+            elseif accept(l, '%')
+                if accept(l, '=')
+                    return emit(l, K">>>%=")
+                else
+                    return emit(l, K">>>%")
+                end
             else # >>>?, ? not a =
                 return emit(l, K">>>")
             end
         elseif accept(l, '=')
             return emit(l, K">>=")
+        elseif accept(l, '%')
+            if accept(l, "=")
+                return emit(l, K">>%=")
+            else
+                return emit(l, K">>%")
+            end
         else
             return emit(l, K">>")
         end
@@ -818,6 +830,12 @@ function lex_less(l::Lexer)
     if accept(l, '<')
         if accept(l, '=')
             return emit(l, K"<<=")
+        elseif accept(l, '%')
+            if accept(l, '=')
+                return emit(l, K"<<%=")
+            else
+                return emit(l, K"<<%")
+            end
         else # '<<?', ? not =, ' '
             return emit(l, K"<<")
         end
@@ -909,6 +927,12 @@ function lex_plus(l::Lexer)
         return emit(l, K"++")
     elseif accept(l, '=')
         return emit(l, K"+=")
+    elseif accept(l, '%')
+        if accept(l, '=')
+            return emit(l, K"+%=")
+        else
+            return emit(l, K"+%")
+        end
     end
     return emit(l, K"+")
 end
@@ -924,6 +948,12 @@ function lex_minus(l::Lexer)
         return emit(l, K"->")
     elseif accept(l, '=')
         return emit(l, K"-=")
+    elseif accept(l, '%')
+        if accept(l, '=')
+            return emit(l, K"-%=")
+        else
+            return emit(l, K"-%")
+        end
     end
     return emit(l, K"-")
 end
@@ -933,6 +963,12 @@ function lex_star(l::Lexer)
         return emit(l, K"Error**") # "**" is an invalid operator use ^
     elseif accept(l, '=')
         return emit(l, K"*=")
+    elseif accept(l, '%')
+        if accept(l, '=')
+            return emit(l, K"*%=")
+        else
+            return emit(l, K"*%")
+        end
     end
     return emit(l, K"*")
 end
diff --git a/test/fuzz_test.jl b/test/fuzz_test.jl
index 15bfa79d..aefe305e 100644
--- a/test/fuzz_test.jl
+++ b/test/fuzz_test.jl
@@ -77,9 +77,12 @@ const all_tokens = [
 
     "="
     "+="
+    "+%="
     "-="   # Also used for "−="
+    "-%="
     "−="
     "*="
+    "*%="
     "/="
     "//="
     "|="
@@ -87,8 +90,11 @@ const all_tokens = [
     "÷="
     "%="
     "<<="
+    "<<%="
     ">>="
+    ">>%="
     ">>>="
+    ">>>%="
     "\\="
     "&="
     ":="
@@ -560,7 +566,9 @@ const all_tokens = [
 
     "\$"
     "+"
+    "+%"
     "-" # also used for "−"
+    "-%"
     "−"
     "++"
     "⊕"
@@ -618,6 +626,7 @@ const all_tokens = [
     "¦"
 
     "*"
+    "*%"
     "/"
     "÷"
     "%"
@@ -701,8 +710,11 @@ const all_tokens = [
     "//"
 
     "<<"
+    "<<%"
     ">>"
+    ">>%"
     ">>>"
+    ">>>%"
 
     "^"
     "↑"
diff --git a/test/tokenize.jl b/test/tokenize.jl
index 26ab044a..c71a6139 100644
--- a/test/tokenize.jl
+++ b/test/tokenize.jl
@@ -166,6 +166,9 @@ end
 
 @testset "test added operators" begin
     @test tok("1+=2",  2).kind == K"+="
+    @test tok("1+%=2", 2).kind == K"+%="
+    @test tok("1-%=2", 2).kind == K"-%="
+    @test tok("1*%=2", 2).kind == K"*%="
     @test tok("1-=2",  2).kind == K"-="
     @test tok("1:=2",  2).kind == K":="
     @test tok("1*=2",  2).kind == K"*="
@@ -876,7 +879,7 @@ end
 
 @testset "new ops" begin
     ops = [
-        raw"= += -= *= /= //= \= ^= ÷= %= <<= >>= >>>= |= &= ⊻= ≔ ⩴ ≕ ~ := $="
+        raw"= += +%= -= -%= *= *%= /= //= \= ^= ÷= %= <<= <<%= >>= >>%= >>>= >>>%= |= &= ⊻= ≔ ⩴ ≕ ~ := $="
         raw"=>"
         raw"?"
         raw"← → ↔ ↚ ↛ ↞ ↠ ↢ ↣ ↦ ↤ ↮ ⇎ ⇍ ⇏ ⇐ ⇒ ⇔ ⇴ ⇶ ⇷ ⇸ ⇹ ⇺ ⇻ ⇼ ⇽ ⇾ ⇿ ⟵ ⟶ ⟷ ⟹ ⟺ ⟻ ⟼ ⟽ ⟾ ⟿ ⤀ ⤁ ⤂ ⤃ ⤄ ⤅ ⤆ ⤇ ⤌ ⤍ ⤎ ⤏ ⤐ ⤑ ⤔ ⤕ ⤖ ⤗ ⤘ ⤝ ⤞ ⤟ ⤠ ⥄ ⥅ ⥆ ⥇ ⥈ ⥊ ⥋ ⥎ ⥐ ⥒ ⥓ ⥖ ⥗ ⥚ ⥛ ⥞ ⥟ ⥢ ⥤ ⥦ ⥧ ⥨ ⥩ ⥪ ⥫ ⥬ ⥭ ⥰ ⧴ ⬱ ⬰ ⬲ ⬳ ⬴ ⬵ ⬶ ⬷ ⬸ ⬹ ⬺ ⬻ ⬼ ⬽ ⬾ ⬿ ⭀ ⭁ ⭂ ⭃ ⭄ ⭇ ⭈ ⭉ ⭊ ⭋ ⭌ ￩ ￫ ⇜ ⇝ ↜ ↝ ↩ ↪ ↫ ↬ ↼ ↽ ⇀ ⇁ ⇄ ⇆ ⇇ ⇉ ⇋ ⇌ ⇚ ⇛ ⇠ ⇢ ↷ ↶ ↺ ↻ -->"
@@ -886,10 +889,10 @@ end
         raw"<|"
         raw"|>"
         raw": .. … ⁝ ⋮ ⋱ ⋰ ⋯"
-        raw"$ + - ¦ | ⊕ ⊖ ⊞ ⊟ ++ ∪ ∨ ⊔ ± ∓ ∔ ∸ ≏ ⊎ ⊻ ⊽ ⋎ ⋓ ⧺ ⧻ ⨈ ⨢ ⨣ ⨤ ⨥ ⨦ ⨧ ⨨ ⨩ ⨪ ⨫ ⨬ ⨭ ⨮ ⨹ ⨺ ⩁ ⩂ ⩅ ⩊ ⩌ ⩏ ⩐ ⩒ ⩔ ⩖ ⩗ ⩛ ⩝ ⩡ ⩢ ⩣"
-        raw"* / ⌿ ÷ % & ⋅ ∘ × \ ∩ ∧ ⊗ ⊘ ⊙ ⊚ ⊛ ⊠ ⊡ ⊓ ∗ ∙ ∤ ⅋ ≀ ⊼ ⋄ ⋆ ⋇ ⋉ ⋊ ⋋ ⋌ ⋏ ⋒ ⟑ ⦸ ⦼ ⦾ ⦿ ⧶ ⧷ ⨇ ⨰ ⨱ ⨲ ⨳ ⨴ ⨵ ⨶ ⨷ ⨸ ⨻ ⨼ ⨽ ⩀ ⩃ ⩄ ⩋ ⩍ ⩎ ⩑ ⩓ ⩕ ⩘ ⩚ ⩜ ⩞ ⩟ ⩠ ⫛ ⊍ ▷ ⨝ ⟕ ⟖ ⟗"
+        raw"$ + +% - -% ¦ | ⊕ ⊖ ⊞ ⊟ ++ ∪ ∨ ⊔ ± ∓ ∔ ∸ ≏ ⊎ ⊻ ⊽ ⋎ ⋓ ⧺ ⧻ ⨈ ⨢ ⨣ ⨤ ⨥ ⨦ ⨧ ⨨ ⨩ ⨪ ⨫ ⨬ ⨭ ⨮ ⨹ ⨺ ⩁ ⩂ ⩅ ⩊ ⩌ ⩏ ⩐ ⩒ ⩔ ⩖ ⩗ ⩛ ⩝ ⩡ ⩢ ⩣"
+        raw"* *% / ⌿ ÷ % & ⋅ ∘ × \ ∩ ∧ ⊗ ⊘ ⊙ ⊚ ⊛ ⊠ ⊡ ⊓ ∗ ∙ ∤ ⅋ ≀ ⊼ ⋄ ⋆ ⋇ ⋉ ⋊ ⋋ ⋌ ⋏ ⋒ ⟑ ⦸ ⦼ ⦾ ⦿ ⧶ ⧷ ⨇ ⨰ ⨱ ⨲ ⨳ ⨴ ⨵ ⨶ ⨷ ⨸ ⨻ ⨼ ⨽ ⩀ ⩃ ⩄ ⩋ ⩍ ⩎ ⩑ ⩓ ⩕ ⩘ ⩚ ⩜ ⩞ ⩟ ⩠ ⫛ ⊍ ▷ ⨝ ⟕ ⟖ ⟗"
         raw"//"
-        raw"<< >> >>>"
+        raw"<< <<% >> >>% >>> >>>%"
         raw"^ ↑ ↓ ⇵ ⟰ ⟱ ⤈ ⤉ ⤊ ⤋ ⤒ ⤓ ⥉ ⥌ ⥍ ⥏ ⥑ ⥔ ⥕ ⥘ ⥙ ⥜ ⥝ ⥠ ⥡ ⥣ ⥥ ⥮ ⥯ ￪ ￬"
         raw"::"
         raw"."