diff --git a/src/Corporation/ICorporation.ts b/src/Corporation/ICorporation.ts
new file mode 100644
index 000000000..775774458
--- /dev/null
+++ b/src/Corporation/ICorporation.ts
@@ -0,0 +1,61 @@
+import { Industry } from "./Industry";
+import { IPlayer } from "../PersonObjects/IPlayer";
+import { CorporationUnlockUpgrade } from "./data/CorporationUnlockUpgrades";
+import { CorporationUpgrade } from "./data/CorporationUpgrades";
+import { CorporationState } from "./CorporationState";
+
+export interface ICorporation {
+    name: string;
+
+    divisions: Industry[];
+
+    funds: any;
+    revenue: any;
+    expenses: any;
+    fundingRound: number;
+    public: boolean;
+    totalShares: number;
+    numShares: number;
+    shareSalesUntilPriceUpdate: number;
+    shareSaleCooldown: number;
+    issueNewSharesCooldown: number;
+    dividendPercentage: number;
+    dividendTaxPercentage: number;
+    issuedShares: number;
+    sharePrice: number;
+    storedCycles: number;
+
+    unlockUpgrades: number[];
+    upgrades: number[];
+    upgradeMultipliers: number[];
+
+    state: CorporationState;
+
+    addFunds(amt: number): void;
+    getState(): string;
+    storeCycles(numCycles: number): void;
+    process(player: IPlayer): void;
+    determineValuation(): number;
+    getTargetSharePrice(): number;
+    updateSharePrice(): void;
+    immediatelyUpdateSharePrice(): void;
+    calculateShareSale(numShares: number): [number, number, number];
+    convertCooldownToString(cd: number): string;
+    unlock(upgrade: CorporationUnlockUpgrade): void;
+    upgrade(upgrade: CorporationUpgrade): void;
+    getProductionMultiplier(): number;
+    getStorageMultiplier(): number;
+    getDreamSenseGain(): number;
+    getAdvertisingMultiplier(): number;
+    getEmployeeCreMultiplier(): number;
+    getEmployeeChaMultiplier(): number;
+    getEmployeeIntMultiplier(): number;
+    getEmployeeEffMultiplier(): number;
+    getSalesMultiplier(): number;
+    getScientificResearchMultiplier(): number;
+    getStarterGuide(player: IPlayer): void;
+    createUI(player: IPlayer): void;
+    rerender(player: IPlayer): void;
+    clearUI(): void;
+    toJSON(): any;
+}
\ No newline at end of file
diff --git a/src/Corporation/ui/CityTabs.tsx b/src/Corporation/ui/CityTabs.tsx
index 6e2255d8a..347d6b8e2 100644
--- a/src/Corporation/ui/CityTabs.tsx
+++ b/src/Corporation/ui/CityTabs.tsx
@@ -5,13 +5,15 @@ import { CityTab } from "./CityTab";
 import { ExpandNewCityPopup } from "./ExpandNewCityPopup";
 import { createPopup } from "../../ui/React/createPopup";
 import { IDivision } from "../IDivision";
+import { ICorporation } from "../ICorporation";
+import { CorporationRouting } from "./Routing";
 
 interface IProps {
-    routing: any;
+    routing: CorporationRouting;
     onClicks: {[key: string]: () => void};
     city: string; // currentCity
     cityStateSetter: (city: string) => void;
-    corp: any;
+    corp: ICorporation;
 }
 
 export function CityTabs(props: IProps): React.ReactElement {
diff --git a/src/Corporation/ui/HeaderTabs.tsx b/src/Corporation/ui/HeaderTabs.tsx
index 28d61c6c7..3dff46d4d 100644
--- a/src/Corporation/ui/HeaderTabs.tsx
+++ b/src/Corporation/ui/HeaderTabs.tsx
@@ -6,16 +6,20 @@ import { HeaderTab } from "./HeaderTab";
 import { IDivision } from "../IDivision";
 import { NewIndustryPopup } from "./NewIndustryPopup";
 import { createPopup } from "../../ui/React/createPopup";
+import { ICorporation } from "../ICorporation";
+import { CorporationRouting } from "./Routing";
+import { IPlayer } from "../../PersonObjects/IPlayer";
 
 interface IProps {
-    corp: any;
-    routing: any;
+    corp: ICorporation;
+    routing: CorporationRouting;
+    player: IPlayer;
 }
 
 export function HeaderTabs(props: IProps): React.ReactElement {
     function overviewOnClick(): void {
         props.routing.routeToOverviewPage();
-        props.corp.rerender();
+        props.corp.rerender(props.player);
     }
 
     function openNewIndustryPopup(): void {
@@ -41,7 +45,7 @@ export function HeaderTabs(props: IProps): React.ReactElement {
                         key={division.name}
                         onClick={() => {
                             props.routing.routeTo(division.name);
-                            props.corp.rerender();
+                            props.corp.rerender(props.player);
                         }}
                         text={division.name}
                     />)
diff --git a/src/Corporation/ui/Industry.tsx b/src/Corporation/ui/Industry.tsx
index e68fcd2d4..5254c3676 100644
--- a/src/Corporation/ui/Industry.tsx
+++ b/src/Corporation/ui/Industry.tsx
@@ -5,10 +5,12 @@ import React from "react";
 import { IndustryOffice } from "./IndustryOffice";
 import { IndustryOverview } from "./IndustryOverview";
 import { IndustryWarehouse } from "./IndustryWarehouse";
+import { ICorporation } from "../ICorporation";
+import { CorporationRouting } from "./Routing";
 
 interface IProps {
-    routing: any;
-    corp: any;
+    routing: CorporationRouting;
+    corp: ICorporation;
     currentCity: string;
 }
 
diff --git a/src/Corporation/ui/MainPanel.tsx b/src/Corporation/ui/MainPanel.tsx
index c1ca735da..aa353291a 100644
--- a/src/Corporation/ui/MainPanel.tsx
+++ b/src/Corporation/ui/MainPanel.tsx
@@ -11,10 +11,12 @@ import { OfficeSpace } from "../OfficeSpace";
 
 import { CityName } from "../../Locations/data/CityNames";
 import { IPlayer } from "../../PersonObjects/IPlayer";
+import { ICorporation } from "../ICorporation";
+import { CorporationRouting } from "./Routing";
 
 interface IProps {
-    corp: any;
-    routing: any;
+    corp: ICorporation;
+    routing: CorporationRouting;
     player: IPlayer;
 }
 
@@ -52,7 +54,7 @@ export function MainPanel(props: IProps): React.ReactElement {
             if (division.offices[cityName] instanceof OfficeSpace) {
                 onClicks[cityName] = () => {
                     setCity(cityName);
-                    props.corp.rerender();
+                    props.corp.rerender(props.player);
                 }
             }
         }
diff --git a/src/Corporation/ui/Overview.tsx b/src/Corporation/ui/Overview.tsx
index bd534175d..b44e58032 100644
--- a/src/Corporation/ui/Overview.tsx
+++ b/src/Corporation/ui/Overview.tsx
@@ -19,9 +19,10 @@ import { numeralWrapper } from "../../ui/numeralFormat";
 import { convertTimeMsToTimeElapsedString } from "../../../utils/StringHelperFunctions";
 import { createPopup } from "../../ui/React/createPopup";
 import { IPlayer } from "../../PersonObjects/IPlayer";
+import { ICorporation } from "../ICorporation";
 
 interface IProps {
-    corp: any;
+    corp: ICorporation;
     player: IPlayer;
 }
 
diff --git a/src/Corporation/ui/Root.tsx b/src/Corporation/ui/Root.tsx
index f41b93a27..f253e0157 100644
--- a/src/Corporation/ui/Root.tsx
+++ b/src/Corporation/ui/Root.tsx
@@ -4,17 +4,19 @@ import React from "react";
 import { HeaderTabs } from "./HeaderTabs";
 import { MainPanel } from "./MainPanel";
 import { IPlayer } from "../../PersonObjects/IPlayer";
+import { ICorporation } from "../ICorporation";
+import { CorporationRouting } from "./Routing";
 
 interface IProps {
-    corp: any;
-    routing: any;
+    corp: ICorporation;
+    routing: CorporationRouting;
     player: IPlayer;
 }
 
 export function CorporationRoot(props: IProps): React.ReactElement {
     return (
         <div>
-            <HeaderTabs corp={props.corp} routing={props.routing} />
+            <HeaderTabs corp={props.corp} routing={props.routing} player={props.player} />
             <MainPanel corp={props.corp} routing={props.routing} player={props.player} />
         </div>
     )