diff --git a/src/Corporation/Actions.ts b/src/Corporation/Actions.ts
index a548c8735..d044867e8 100644
--- a/src/Corporation/Actions.ts
+++ b/src/Corporation/Actions.ts
@@ -94,7 +94,7 @@ export function SellMaterial(mat: Material, amt: string, price: string): void {
     throw new Error("Invalid value or expression for sell price field: " + e);
   }
 
-  if (temp == null || isNaN(parseFloat(temp))) {
+  if (temp == null || isNaN(parseFloat(temp)) || parseFloat(temp) < 0) {
     throw new Error("Invalid value or expression for sell price field");
   }
 
@@ -117,13 +117,13 @@ export function SellMaterial(mat: Material, amt: string, price: string): void {
       throw new Error("Invalid value or expression for sell price field: " + e);
     }
 
-    if (tempQty == null || isNaN(parseFloat(tempQty))) {
+    if (tempQty == null || isNaN(parseFloat(tempQty)) || parseFloat(tempQty) < 0) {
       throw new Error("Invalid value or expression for sell price field");
     }
 
     mat.sllman[0] = true;
     mat.sllman[1] = q; //Use sanitized input
-  } else if (isNaN(parseFloat(amt))) {
+  } else if (isNaN(parseFloat(amt)) || parseFloat(amt) < 0) {
     throw new Error("Invalid value for sell quantity field! Must be numeric or 'MAX'");
   } else {
     let q = parseFloat(amt);
@@ -153,7 +153,7 @@ export function SellProduct(product: Product, city: string, amt: string, price:
     } catch (e) {
       throw new Error("Invalid value or expression for sell quantity field: " + e);
     }
-    if (temp == null || isNaN(parseFloat(temp))) {
+    if (temp == null || isNaN(parseFloat(temp)) || parseFloat(temp) < 0) {
       throw new Error("Invalid value or expression for sell quantity field.");
     }
     product.sCost = price; //Use sanitized price
@@ -182,7 +182,7 @@ export function SellProduct(product: Product, city: string, amt: string, price:
       throw new Error("Invalid value or expression for sell price field: " + e);
     }
 
-    if (temp == null || isNaN(parseFloat(temp))) {
+    if (temp == null || isNaN(parseFloat(temp)) || parseFloat(temp) < 0) {
       throw new Error("Invalid value or expression for sell price field");
     }
     if (all) {
@@ -195,7 +195,7 @@ export function SellProduct(product: Product, city: string, amt: string, price:
       product.sllman[city][0] = true;
       product.sllman[city][1] = qty; //Use sanitized input
     }
-  } else if (isNaN(parseFloat(amt))) {
+  } else if (isNaN(parseFloat(amt)) || parseFloat(amt) < 0) {
     throw new Error("Invalid value for sell quantity field! Must be numeric");
   } else {
     let qty = parseFloat(amt);
@@ -239,7 +239,7 @@ export function SetSmartSupplyUseLeftovers(warehouse: Warehouse, material: Mater
 }
 
 export function BuyMaterial(material: Material, amt: number): void {
-  if (isNaN(amt)) {
+  if (isNaN(amt) || amt < 0) {
     throw new Error(`Invalid amount '${amt}' to buy material '${material.name}'`);
   }
   material.buy = amt;
diff --git a/src/Corporation/ui/PurchaseMaterialModal.tsx b/src/Corporation/ui/PurchaseMaterialModal.tsx
index 28d1482a0..114e53940 100644
--- a/src/Corporation/ui/PurchaseMaterialModal.tsx
+++ b/src/Corporation/ui/PurchaseMaterialModal.tsx
@@ -30,7 +30,7 @@ function BulkPurchaseText(props: IBulkPurchaseTextProps): React.ReactElement {
         <Typography color={"error"}>Not enough warehouse space to purchase this amount</Typography>
       </>
     );
-  } else if (isNaN(cost)) {
+  } else if (isNaN(cost) || parsedAmt < 0) {
     return (
       <>
         <Typography color={"error"}>Invalid put for Bulk Purchase amount</Typography>
@@ -68,7 +68,7 @@ function BulkPurchase(props: IBPProps): React.ReactElement {
       return;
     }
 
-    if (isNaN(amount)) {
+    if (isNaN(amount) || amount < 0) {
       dialogBoxCreate("Invalid input amount");
     } else {
       const cost = amount * props.mat.bCost;
diff --git a/src/NetscriptFunctions/Corporation.ts b/src/NetscriptFunctions/Corporation.ts
index 469e1157d..9bf06d1fd 100644
--- a/src/NetscriptFunctions/Corporation.ts
+++ b/src/NetscriptFunctions/Corporation.ts
@@ -55,9 +55,10 @@ import { CorporationUpgrades } from "../Corporation/data/CorporationUpgrades";
 import { EmployeePositions } from "../Corporation/EmployeePositions";
 import { calculateIntelligenceBonus } from "../PersonObjects/formulas/intelligence";
 import { Industry } from "../Corporation/Industry";
-import { IndustryStartingCosts } from "../Corporation/IndustryData";
+import { IndustryResearchTrees, IndustryStartingCosts } from "../Corporation/IndustryData";
 import { CorporationConstants } from "../Corporation/data/Constants";
 import { IndustryUpgrades } from "../Corporation/IndustryUpgrades";
+import { ResearchMap } from "../Corporation/ResearchMap";
 
 export function NetscriptCorporation(
   player: IPlayer,
@@ -129,7 +130,7 @@ export function NetscriptCorporation(
 
   function getInvestmentOffer(): InvestmentOffer {
     const corporation = getCorporation();
-    if (corporation.fundingRound >= CorporationConstants.FundingRoundShares.length || corporation.fundingRound >= CorporationConstants.FundingRoundMultiplier.length) 
+    if (corporation.fundingRound >= CorporationConstants.FundingRoundShares.length || corporation.fundingRound >= CorporationConstants.FundingRoundMultiplier.length || corporation.public) 
       return {
         funds: 0,
         shares: 0,
@@ -149,7 +150,7 @@ export function NetscriptCorporation(
 
   function acceptInvestmentOffer(): boolean {
     const corporation = getCorporation();
-    if (corporation.fundingRound >= CorporationConstants.FundingRoundShares.length || corporation.fundingRound >= CorporationConstants.FundingRoundMultiplier.length) return false;
+    if (corporation.fundingRound >= CorporationConstants.FundingRoundShares.length || corporation.fundingRound >= CorporationConstants.FundingRoundMultiplier.length || corporation.public) return false;
     const val = corporation.determineValuation();
     const percShares = CorporationConstants.FundingRoundShares[corporation.fundingRound];
     const roundMultiplier = CorporationConstants.FundingRoundMultiplier[corporation.fundingRound];
@@ -161,6 +162,33 @@ export function NetscriptCorporation(
     return true;
   }
 
+  function goPublic(numShares: number): boolean {
+    const corporation = getCorporation();
+    const initialSharePrice = corporation.determineValuation() / corporation.totalShares;
+    if (isNaN(numShares)) throw new Error("Invalid value for number of issued shares");
+    if (numShares < 0) throw new Error("Invalid value for number of issued shares");
+    if (numShares > corporation.numShares) throw new Error("You don't have that many shares to issue!");
+    corporation.public = true;
+    corporation.sharePrice = initialSharePrice;
+    corporation.issuedShares = numShares;
+    corporation.numShares -= numShares;
+    corporation.addFunds(numShares * initialSharePrice);
+    return true;
+  }
+
+  function getResearchCost(division: IIndustry, researchName: string): number {
+    const researchTree = IndustryResearchTrees[division.type];
+    if (researchTree === undefined) throw new Error(`No research tree for industry '${division.type}'`);
+    const allResearch = researchTree.getAllNodes();
+    if (!allResearch.includes(researchName)) throw new Error(`No research named '${researchName}'`);
+    const research = ResearchMap[researchName];
+    return research.cost;
+  }
+
+  function hasResearched(division: IIndustry, researchName: string): boolean {
+    return division.researched[researchName] === undefined ? false : division.researched[researchName] as boolean;
+  }
+
   function getCorporation(): ICorporation {
     const corporation = player.corporation;
     if (corporation === null) throw new Error("cannot be called without a corporation");
@@ -239,6 +267,7 @@ export function NetscriptCorporation(
         thisCycleExpenses: division.thisCycleExpenses,
         upgrades: division.upgrades,
         cities: cities,
+        products: division.products === undefined ? [] : Object.keys(division.products),
       };
   }
 
@@ -286,6 +315,8 @@ export function NetscriptCorporation(
         name: material.name,
         qty: material.qty,
         qlt: material.qlt,
+        prod: material.prd,
+        sell: material.sll,
       };
     },
     getProduct: function (adivisionName: any, aproductName: any): NSProduct {
@@ -299,6 +330,8 @@ export function NetscriptCorporation(
         cmp: product.cmp,
         pCost: product.pCost,
         sCost: product.sCost,
+        cityData: product.data,
+        developmentProgress: product.prog,
       };
     },
     purchaseWarehouse: function (adivisionName: any, acityName: any): void {
@@ -363,6 +396,7 @@ export function NetscriptCorporation(
       const cityName = helper.string("buyMaterial", "cityName", acityName);
       const materialName = helper.string("buyMaterial", "materialName", amaterialName);
       const amt = helper.number("buyMaterial", "amt", aamt);
+      if (amt < 0) throw new Error("Invalid value for ammount field! Must be numeric and grater than 0");
       const material = getMaterial(divisionName, cityName, materialName);
       BuyMaterial(material, amt);
     },
@@ -449,19 +483,31 @@ export function NetscriptCorporation(
   };
 
   const officeAPI: OfficeAPI = {
-    getHireAdVertCost: function (adivisionName: string): number {
-      checkAccess("hireAdVert", 8);
-      const divisionName = helper.string("hireAdVert", "divisionName", adivisionName);
+    getHireAdVertCost: function (adivisionName: any): number {
+      checkAccess("getHireAdVertCost", 8);
+      const divisionName = helper.string("getHireAdVertCost", "divisionName", adivisionName);
       const division = getDivision(divisionName);
       const upgrade = IndustryUpgrades[1];
       return upgrade[1] * Math.pow(upgrade[2], division.upgrades[1]);
     },
-    getHireAdVertCount: function (adivisionName: string): number {
-      checkAccess("hireAdVert", 8);
-      const divisionName = helper.string("hireAdVert", "divisionName", adivisionName);
+    getHireAdVertCount: function (adivisionName: any): number {
+      checkAccess("getHireAdVertCount", 8);
+      const divisionName = helper.string("getHireAdVertCount", "divisionName", adivisionName);
       const division = getDivision(divisionName);
       return division.upgrades[1]
     },
+    getResearchCost: function (adivisionName: any, aresearchName: any): number {
+      checkAccess("getResearchCost", 8);
+      const divisionName = helper.string("getResearchCost", "divisionName", adivisionName);
+      const researchName = helper.string("getResearchCost", "researchName", aresearchName);
+      return getResearchCost(getDivision(divisionName), researchName);
+    },
+    hasResearched: function (adivisionName: any, aresearchName: any): boolean {
+      checkAccess("hasResearched", 8);
+      const divisionName = helper.string("hasResearched", "divisionName", adivisionName);
+      const researchName = helper.string("hasResearched", "researchName", aresearchName);
+      return hasResearched(getDivision(divisionName), researchName);
+    },
     assignJob: function (adivisionName: any, acityName: any, aemployeeName: any, ajob: any): Promise<void> {
       checkAccess("assignJob", 8);
       const divisionName = helper.string("assignJob", "divisionName", adivisionName);
@@ -485,6 +531,7 @@ export function NetscriptCorporation(
       const divisionName = helper.string("upgradeOfficeSize", "divisionName", adivisionName);
       const cityName = helper.string("upgradeOfficeSize", "cityName", acityName);
       const size = helper.number("upgradeOfficeSize", "size", asize);
+      if (size < 0) throw new Error("Invalid value for size field! Must be numeric and grater than 0");
       const office = getOffice(divisionName, cityName);
       const corporation = getCorporation();
       UpgradeOfficeSize(corporation, office, size);
@@ -494,6 +541,7 @@ export function NetscriptCorporation(
       const divisionName = helper.string("throwParty", "divisionName", adivisionName);
       const cityName = helper.string("throwParty", "cityName", acityName);
       const costPerEmployee = helper.number("throwParty", "costPerEmployee", acostPerEmployee);
+      if (costPerEmployee < 0) throw new Error("Invalid value for Cost Per Employee field! Must be numeric and grater than 0");
       const office = getOffice(divisionName, cityName);
       const corporation = getCorporation();
       return netscriptDelay(
@@ -588,6 +636,7 @@ export function NetscriptCorporation(
       checkAccess("expandCity");
       const divisionName = helper.string("expandCity", "divisionName", adivisionName);
       const cityName = helper.string("expandCity", "cityName", acityName);
+      if (!CorporationConstants.Cities.includes(cityName)) throw new Error("Invalid city name");
       const corporation = getCorporation();
       const division = getDivision(divisionName);
       NewCity(corporation, division, cityName);
@@ -611,6 +660,7 @@ export function NetscriptCorporation(
     issueDividends: function (apercent: any): void {
       checkAccess("issueDividends");
       const percent = helper.number("issueDividends", "percent", apercent);
+      if (percent < 0 || percent > 100) throw new Error("Invalid value for Cost Per Employee field! Must be numeric, grater than 0, and less than 100");
       const corporation = getCorporation();
       IssueDividends(corporation, percent);
     },
@@ -641,27 +691,33 @@ export function NetscriptCorporation(
         divisions: corporation.divisions.map((division): NSDivision => getSafeDivision(division)),
       };
     },
-    createCorporation: function (corporationName: string, selfFund = true): boolean {
+    createCorporation: function (acorporationName: string, selfFund = true): boolean {
+      const corporationName = helper.string("createCorporation", "corporationName", acorporationName);
       return createCorporation(corporationName, selfFund);
     },
-    hasUnlockUpgrade: function (upgradeName: string): boolean {
+    hasUnlockUpgrade: function (aupgradeName: any): boolean {
       checkAccess("hasUnlockUpgrade");
+      const upgradeName = helper.string("hasUnlockUpgrade", "upgradeName", aupgradeName);
       return hasUnlockUpgrade(upgradeName);
     },
-    getUnlockUpgradeCost: function (upgradeName: string): number {
+    getUnlockUpgradeCost: function (aupgradeName: any): number {
       checkAccess("getUnlockUpgradeCost");
+      const upgradeName = helper.string("getUnlockUpgradeCost", "upgradeName", aupgradeName);
       return getUnlockUpgradeCost(upgradeName);
     },
-    getUpgradeLevel: function (upgradeName: string): number {
+    getUpgradeLevel: function (aupgradeName: any): number {
       checkAccess("hasUnlockUpgrade");
+      const upgradeName = helper.string("getUpgradeLevel", "upgradeName", aupgradeName);
       return getUpgradeLevel(upgradeName);
     },
-    getUpgradeLevelCost: function (upgradeName: string): number {
+    getUpgradeLevelCost: function (aupgradeName: any): number {
       checkAccess("getUpgradeLevelCost");
+      const upgradeName = helper.string("getUpgradeLevelCost", "upgradeName", aupgradeName);
       return getUpgradeLevelCost(upgradeName);
     },
-    getExpandIndustryCost: function (industryName: string): number {
+    getExpandIndustryCost: function (aindustryName: any): number {
       checkAccess("getExpandIndustryCost");
+      const industryName = helper.string("getExpandIndustryCost", "industryName", aindustryName);
       return getExpandIndustryCost(industryName);
     },
     getExpandCityCost: function(): number {
@@ -676,5 +732,10 @@ export function NetscriptCorporation(
       checkAccess("acceptInvestmentOffer");
       return acceptInvestmentOffer();
     },
+    goPublic(anumShares: any): boolean {
+      checkAccess("acceptInvestmentOffer");
+      const numShares = helper.number("goPublic", "numShares", anumShares);
+      return goPublic(numShares);
+    },
   };
 }
diff --git a/src/ScriptEditor/NetscriptDefinitions.d.ts b/src/ScriptEditor/NetscriptDefinitions.d.ts
index 14b88ea97..f0750bae8 100644
--- a/src/ScriptEditor/NetscriptDefinitions.d.ts
+++ b/src/ScriptEditor/NetscriptDefinitions.d.ts
@@ -6145,13 +6145,27 @@ export interface OfficeAPI {
    * @param divisionName - Name of the division
    * @returns Cost
    */
-  getHireAdVertCost(adivisionName: string): number;
+  getHireAdVertCost(divisionName: string): number;
   /**
    * Get the number of times you have Hired AdVert
    * @param divisionName - Name of the division
    * @returns Number of times you have Hired AdVert
    */
   getHireAdVertCount(adivisionName: string): number;
+  /**
+   * Get the cost to unlock research
+   * @param divisionName - Name of the division
+   * @param cityName - Name of the city
+   * @returns cost
+   */
+  getResearchCost(divisionName: string, researchName: string): number;
+  /**
+   * Gets if you have unlocked a research
+   * @param divisionName - Name of the division
+   * @param cityName - Name of the city
+   * @returns true is unlocked, false if not
+   */
+  hasResearched(divisionName: string, researchName: string): boolean;
 }
 
 /**
@@ -6395,6 +6409,12 @@ export interface Corporation extends WarehouseAPI, OfficeAPI {
    * @returns An offer of investment
    */
   acceptInvestmentOffer(): boolean;
+  /**
+   * Go public
+   * @param numShares number of shares you would like to issue for your IPO
+   * @returns true if you successfully go public, false if not
+   */
+  goPublic(numShares: number): boolean;
   /**
    * Get corporation data
    * @returns Corporation data
@@ -6507,6 +6527,12 @@ interface Product {
   pCost: number;
   /** Sell cost, can be "MP+5" */
   sCost: string | number;
+  /** Data refers to the production, sale, and quantity of the products 
+   * These values are specific to a city 
+   * For each city, the data is [qty, prod, sell] */
+   cityData: {[key: string]:number[]};
+  /** Creation progress - A number betwee 0-100 representing percentage */
+  developmentProgress: number;
 }
 
 /**
@@ -6520,6 +6546,10 @@ interface Material {
   qty: number;
   /** Quality of the material */
   qlt: number;
+  /** Amount of material produced  */
+  prod: number;
+  /** Amount of material sold  */
+  sell: number;
 }
 
 /**
@@ -6607,6 +6637,8 @@ interface Division {
   upgrades: number[];
   /** Cities in which this division has expanded */
   cities: string[];
+  /** Products developed by this division */
+  products: string[];
 }
 
 /**