diff --git a/package-lock.json b/package-lock.json
index c29b9607a76..415a3aa2003 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "material2-srcs",
-  "version": "5.0.2",
+  "version": "5.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1057,14 +1057,6 @@
                 }
               }
             },
-            "string_decoder": {
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-              "bundled": true,
-              "dev": true,
-              "requires": {
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-              }
-            },
             "string-width": {
               "version": "1.0.2",
               "bundled": true,
@@ -1075,6 +1067,14 @@
                 "strip-ansi": "3.0.1"
               }
             },
+            "string_decoder": {
+              "version": "1.0.3",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "safe-buffer": "5.1.1"
+              }
+            },
             "stringstream": {
               "version": "0.0.5",
               "bundled": true,
@@ -2125,14 +2125,6 @@
                 }
               }
             },
-            "string_decoder": {
-              "version": "1.0.3",
-              "bundled": true,
-              "dev": true,
-              "requires": {
-                "safe-buffer": "5.1.1"
-              }
-            },
             "string-width": {
               "version": "1.0.2",
               "bundled": true,
@@ -2143,6 +2135,14 @@
                 "strip-ansi": "3.0.1"
               }
             },
+            "string_decoder": {
+              "version": "1.0.3",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "safe-buffer": "5.1.1"
+              }
+            },
             "stringstream": {
               "version": "0.0.5",
               "bundled": true,
@@ -2616,6 +2616,16 @@
         "@types/node": "7.0.48"
       }
     },
+    "JSONStream": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.1.tgz",
+      "integrity": "sha1-cH92HgHa6eFvG8+TcDt4xwlmV5o=",
+      "dev": true,
+      "requires": {
+        "jsonparse": "1.3.1",
+        "through": "2.3.8"
+      }
+    },
     "a-sync-waterfall": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/a-sync-waterfall/-/a-sync-waterfall-1.0.0.tgz",
@@ -3623,6 +3633,7 @@
       "requires": {
         "anymatch": "1.3.2",
         "async-each": "1.0.1",
+        "fsevents": "1.1.3",
         "glob-parent": "2.0.0",
         "inherits": "2.0.3",
         "is-binary-path": "1.0.1",
@@ -4279,8 +4290,8 @@
       "integrity": "sha1-HxXOa4RPfKQUlcgZDAgzwwuLFpM=",
       "dev": true,
       "requires": {
-        "is-text-path": "1.0.1",
         "JSONStream": "1.3.1",
+        "is-text-path": "1.0.1",
         "lodash": "4.17.4",
         "meow": "3.7.0",
         "split2": "2.2.0",
@@ -6117,6 +6128,7 @@
       "dev": true,
       "requires": {
         "@google-cloud/functions-emulator": "1.0.0-alpha.27",
+        "JSONStream": "1.3.1",
         "archiver": "2.1.0",
         "chalk": "1.1.3",
         "cjson": "0.3.3",
@@ -6137,7 +6149,6 @@
         "inquirer": "0.12.0",
         "is": "3.2.1",
         "jsonschema": "1.2.0",
-        "JSONStream": "1.3.1",
         "jsonwebtoken": "7.4.3",
         "lodash": "4.17.4",
         "open": "0.0.5",
@@ -6512,6 +6523,910 @@
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
       "dev": true
     },
+    "fsevents": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.1.3.tgz",
+      "integrity": "sha512-WIr7iDkdmdbxu/Gh6eKEZJL6KPE74/5MEsf2whTOFNxbIoIixogroLdKYqB6FDav4Wavh/lZdzzd3b2KxIXC5Q==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "nan": "2.8.0",
+        "node-pre-gyp": "0.6.39"
+      },
+      "dependencies": {
+        "abbrev": {
+          "version": "1.1.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "ajv": {
+          "version": "4.11.8",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "co": "4.6.0",
+            "json-stable-stringify": "1.0.1"
+          }
+        },
+        "ansi-regex": {
+          "version": "2.1.1",
+          "bundled": true,
+          "dev": true
+        },
+        "aproba": {
+          "version": "1.1.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "are-we-there-yet": {
+          "version": "1.1.4",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "delegates": "1.0.0",
+            "readable-stream": "2.2.9"
+          }
+        },
+        "asn1": {
+          "version": "0.2.3",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "assert-plus": {
+          "version": "0.2.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
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+        "asynckit": {
+          "version": "0.4.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "aws-sign2": {
+          "version": "0.6.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
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+          "version": "1.6.0",
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+        "balanced-match": {
+          "version": "0.4.2",
+          "bundled": true,
+          "dev": true
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+        "bcrypt-pbkdf": {
+          "version": "1.0.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "tweetnacl": "0.14.5"
+          }
+        },
+        "block-stream": {
+          "version": "0.0.9",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "inherits": "2.0.3"
+          }
+        },
+        "boom": {
+          "version": "2.10.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "hoek": "2.16.3"
+          }
+        },
+        "brace-expansion": {
+          "version": "1.1.7",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "balanced-match": "0.4.2",
+            "concat-map": "0.0.1"
+          }
+        },
+        "buffer-shims": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true
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+        "code-point-at": {
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+          "bundled": true,
+          "dev": true
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+        "combined-stream": {
+          "version": "1.0.5",
+          "bundled": true,
+          "dev": true,
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+          }
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+          "bundled": true,
+          "dev": true
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+        "console-control-strings": {
+          "version": "1.1.0",
+          "bundled": true,
+          "dev": true
+        },
+        "core-util-is": {
+          "version": "1.0.2",
+          "bundled": true,
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+            "inherits": "2.0.3",
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+              "optional": true
+            }
+          }
+        },
+        "readable-stream": {
+          "version": "2.2.9",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "buffer-shims": "1.0.0",
+            "core-util-is": "1.0.2",
+            "inherits": "2.0.3",
+            "isarray": "1.0.0",
+            "process-nextick-args": "1.0.7",
+            "string_decoder": "1.0.1",
+            "util-deprecate": "1.0.2"
+          }
+        },
+        "request": {
+          "version": "2.81.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "aws-sign2": "0.6.0",
+            "aws4": "1.6.0",
+            "caseless": "0.12.0",
+            "combined-stream": "1.0.5",
+            "extend": "3.0.1",
+            "forever-agent": "0.6.1",
+            "form-data": "2.1.4",
+            "har-validator": "4.2.1",
+            "hawk": "3.1.3",
+            "http-signature": "1.1.1",
+            "is-typedarray": "1.0.0",
+            "isstream": "0.1.2",
+            "json-stringify-safe": "5.0.1",
+            "mime-types": "2.1.15",
+            "oauth-sign": "0.8.2",
+            "performance-now": "0.2.0",
+            "qs": "6.4.0",
+            "safe-buffer": "5.0.1",
+            "stringstream": "0.0.5",
+            "tough-cookie": "2.3.2",
+            "tunnel-agent": "0.6.0",
+            "uuid": "3.0.1"
+          }
+        },
+        "rimraf": {
+          "version": "2.6.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "glob": "7.1.2"
+          }
+        },
+        "safe-buffer": {
+          "version": "5.0.1",
+          "bundled": true,
+          "dev": true
+        },
+        "semver": {
+          "version": "5.3.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "set-blocking": {
+          "version": "2.0.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "signal-exit": {
+          "version": "3.0.2",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "sntp": {
+          "version": "1.0.9",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "hoek": "2.16.3"
+          }
+        },
+        "sshpk": {
+          "version": "1.13.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "asn1": "0.2.3",
+            "assert-plus": "1.0.0",
+            "bcrypt-pbkdf": "1.0.1",
+            "dashdash": "1.14.1",
+            "ecc-jsbn": "0.1.1",
+            "getpass": "0.1.7",
+            "jodid25519": "1.0.2",
+            "jsbn": "0.1.1",
+            "tweetnacl": "0.14.5"
+          },
+          "dependencies": {
+            "assert-plus": {
+              "version": "1.0.0",
+              "bundled": true,
+              "dev": true,
+              "optional": true
+            }
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "code-point-at": "1.1.0",
+            "is-fullwidth-code-point": "1.0.0",
+            "strip-ansi": "3.0.1"
+          }
+        },
+        "string_decoder": {
+          "version": "1.0.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "safe-buffer": "5.0.1"
+          }
+        },
+        "stringstream": {
+          "version": "0.0.5",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "ansi-regex": "2.1.1"
+          }
+        },
+        "strip-json-comments": {
+          "version": "2.0.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "tar": {
+          "version": "2.2.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "block-stream": "0.0.9",
+            "fstream": "1.0.11",
+            "inherits": "2.0.3"
+          }
+        },
+        "tar-pack": {
+          "version": "3.4.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "debug": "2.6.8",
+            "fstream": "1.0.11",
+            "fstream-ignore": "1.0.5",
+            "once": "1.4.0",
+            "readable-stream": "2.2.9",
+            "rimraf": "2.6.1",
+            "tar": "2.2.1",
+            "uid-number": "0.0.6"
+          }
+        },
+        "tough-cookie": {
+          "version": "2.3.2",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "punycode": "1.4.1"
+          }
+        },
+        "tunnel-agent": {
+          "version": "0.6.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "safe-buffer": "5.0.1"
+          }
+        },
+        "tweetnacl": {
+          "version": "0.14.5",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "uid-number": {
+          "version": "0.0.6",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "util-deprecate": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true
+        },
+        "uuid": {
+          "version": "3.0.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "verror": {
+          "version": "1.3.6",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "extsprintf": "1.0.2"
+          }
+        },
+        "wide-align": {
+          "version": "1.1.2",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "string-width": "1.0.2"
+          }
+        },
+        "wrappy": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true
+        }
+      }
+    },
     "fstream": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.11.tgz",
@@ -7930,13 +8845,6 @@
             }
           }
         },
-        "string_decoder": {
-          "version": "1.0.3",
-          "bundled": true,
-          "requires": {
-            "safe-buffer": "5.1.1"
-          }
-        },
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
@@ -7946,6 +8854,13 @@
             "strip-ansi": "3.0.1"
           }
         },
+        "string_decoder": {
+          "version": "1.0.3",
+          "bundled": true,
+          "requires": {
+            "safe-buffer": "5.1.1"
+          }
+        },
         "stringstream": {
           "version": "0.0.5",
           "bundled": true
@@ -10123,16 +11038,6 @@
       "integrity": "sha512-XDJApzBauMg0TinJNP4iVcJl99PQ4JbWKK7nwzpOIkAOVveDKgh/2xm41T3x7Spu4PWMhnnQpNJmUSIUgl6sKg==",
       "dev": true
     },
-    "JSONStream": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.1.tgz",
-      "integrity": "sha1-cH92HgHa6eFvG8+TcDt4xwlmV5o=",
-      "dev": true,
-      "requires": {
-        "jsonparse": "1.3.1",
-        "through": "2.3.8"
-      }
-    },
     "jsonwebtoken": {
       "version": "7.4.3",
       "resolved": "https://registry.npmjs.org/jsonwebtoken/-/jsonwebtoken-7.4.3.tgz",
@@ -14960,14 +15865,6 @@
       "resolved": "https://registry.npmjs.org/stream-shift/-/stream-shift-1.0.0.tgz",
       "integrity": "sha1-1cdSgl5TZ+eG944Y5EXqIjoVWVI="
     },
-    "string_decoder": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
-      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
-      "requires": {
-        "safe-buffer": "5.1.1"
-      }
-    },
     "string-format-obj": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/string-format-obj/-/string-format-obj-1.1.0.tgz",
@@ -14999,6 +15896,14 @@
         "strip-ansi": "3.0.1"
       }
     },
+    "string_decoder": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
+      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
     "stringify-entities": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/stringify-entities/-/stringify-entities-1.3.1.tgz",
diff --git a/src/lib/icon/icon-registry.ts b/src/lib/icon/icon-registry.ts
index f0b54dcef68..ef4a06acbcb 100644
--- a/src/lib/icon/icon-registry.ts
+++ b/src/lib/icon/icon-registry.ts
@@ -224,7 +224,7 @@ export class MatIconRegistry {
 
     return this._loadSvgIconFromConfig(new SvgIconConfig(safeUrl)).pipe(
       tap(svg => this._cachedIconsByUrl.set(url!, svg)),
-      map(svg => cloneSvg(svg))
+      map(svg => cloneSvg(svg)),
     );
   }
 
@@ -266,7 +266,7 @@ export class MatIconRegistry {
       // Fetch the icon from the config's URL, cache it, and return a copy.
       return this._loadSvgIconFromConfig(config).pipe(
         tap(svg => config.svgElement = svg),
-        map(svg => cloneSvg(svg))
+        map(svg => cloneSvg(svg)),
       );
     }
   }
@@ -305,12 +305,6 @@ export class MatIconRegistry {
             // necessarily fail.
             console.log(`Loading icon set URL: ${url} failed: ${err}`);
             return observableOf(null);
-          }),
-          tap(svg => {
-            // Cache the SVG element.
-            if (svg) {
-              iconSetConfig.svgElement = svg;
-            }
           })
         );
       });
@@ -362,8 +356,20 @@ export class MatIconRegistry {
    * from it.
    */
   private _loadSvgIconSetFromConfig(config: SvgIconConfig): Observable<SVGElement> {
-    // TODO: Document that icons should only be loaded from trusted sources.
-    return this._fetchUrl(config.url).pipe(map(svgText => this._svgElementFromString(svgText)));
+    // If the SVG for this icon set has already been parsed, do nothing.
+    if (config.svgElement) {
+      return observableOf(config.svgElement);
+    }
+
+    return this._fetchUrl(config.url).pipe(map(svgText => {
+      // It is possible that the icon set was parsed and cached by an earlier request, so parsing
+      // only needs to occur if the cache is yet unset.
+      if (!config.svgElement) {
+        config.svgElement = this._svgElementFromString(svgText);
+      }
+
+      return config.svgElement;
+    }));
   }
 
   /**
@@ -492,7 +498,7 @@ export class MatIconRegistry {
     // Observable. Figure out why and fix it.
     const req = this._httpClient.get(url, {responseType: 'text'}).pipe(
       finalize(() => this._inProgressUrlFetches.delete(url)),
-      share()
+      share(),
     );
 
     this._inProgressUrlFetches.set(url, req);
@@ -517,9 +523,9 @@ export const ICON_REGISTRY_PROVIDER = {
     [new Optional(), new SkipSelf(), MatIconRegistry],
     [new Optional(), HttpClient],
     DomSanitizer,
-    [new Optional(), DOCUMENT as InjectionToken<any>]
+    [new Optional(), DOCUMENT as InjectionToken<any>],
   ],
-  useFactory: ICON_REGISTRY_PROVIDER_FACTORY
+  useFactory: ICON_REGISTRY_PROVIDER_FACTORY,
 };
 
 /** Clones an SVGElement while preserving type information. */
diff --git a/src/lib/icon/icon.spec.ts b/src/lib/icon/icon.spec.ts
index 7ce8a94ca2e..2c0da31be02 100644
--- a/src/lib/icon/icon.spec.ts
+++ b/src/lib/icon/icon.spec.ts
@@ -207,6 +207,25 @@ describe('MatIcon', () => {
       verifyPathChildElement(svgChild, 'moo');
     });
 
+    it('should never parse the same icon set multiple times', () => {
+      // Normally we avoid spying on private methods like this, but the parsing is a private
+      // implementation detail that should not be exposed to the public API. This test, though,
+      // is important enough to warrant the brittle-ness that results.
+      spyOn(iconRegistry, '_svgElementFromString' as any).and.callThrough();
+
+      iconRegistry.addSvgIconSetInNamespace('farm', trust('farm-set-1.svg'));
+
+      // Requests for icons must be subscribed to in order for requests to be made.
+      iconRegistry.getNamedSvgIcon('pig', 'farm').subscribe(() => {});
+      iconRegistry.getNamedSvgIcon('cow', 'farm').subscribe(() => {});
+
+      http.expectOne('farm-set-1.svg').flush(FAKE_SVGS.farmSet1);
+
+      // _svgElementFromString is called once for each icon to create an empty SVG element
+      // and once to parse the full icon set.
+      expect((iconRegistry as any)._svgElementFromString).toHaveBeenCalledTimes(3);
+    });
+
     it('should allow multiple icon sets in a namespace', () => {
       iconRegistry.addSvgIconSetInNamespace('farm', trust('farm-set-1.svg'));
       iconRegistry.addSvgIconSetInNamespace('farm', trust('farm-set-2.svg'));