1. Global POSCO Family 0 Screen: Bid running status Menu path: BIDDING/Bidding running/Bid running status Description: View Bid Running Status ScreenProcesses and functionalities Click BIDDING on first page Clicking Bid running status will display the list of bids being underway ※ Special notes 0 2 1 Materials 3. Bidding 1 2

2. Global POSCO Family 1 Screen Description: Display bidding list (bids participated by logged-in suppliers only will be displayed: bids of other suppliers will not be displayed) Clicking bid No. will display detailed bid information and it will allow submitting a quote Case nameName of a bid: clicking it will display detailed bid information and will allow quote submission Bid beginning dateDate when bidding will begin Day and hour for bid closingBid end day: after the bid closing hour, quotes cannot be submitted RFQ No.RFQ number (RFQ: Request For Quotation) Bid No.Number of a bid When bidding is done in a Round format, put Round number after the bid number e.g., Q10080020-1 (1 Round), Q10080020-2 (2 Round) Bidding methodDisplay bidding method - Sealed bidding: Compare supplier quote prices and determine a successful bidder Bid continues until the target price is reached - Negotiation: Bidding is done through negotiations Unit price entry methodMethod with which successful bidder is determined - Total amount system: Based on the total amount, supplier that presented lowest price will be determined as final bidder - Item by Item: Supplier that presented lowest price by item will be determined as final bidder StatusShow bidding status - Scheduled: bidding has not begun yet: detailed bidding information can be checked - In Progress: bidding is in progress: quotes can be submitted - Completed: bidding deadline has passed and buyer has not decided successful/failed bid - Contract awarded (or Successful Bid): bidding deadline has passed and buyer awarded a contract - Bidding failed: bidding deadline has passed and buyer turned down bids - Emergency Suspension: buyer suspended bid submission - Simple Estimation: buyer launches a bid to estimate item price supplier can help buyer survey prices by submitting fake quotes - Partially Won: contract has been awarded to partial items - Draw Lots: when quote prices are the same, drawing lots can be used to determine a successful bidder: when this appears, it will be settled by lots

3. Global POSCO Family 2 Screen: Bidding Detail (Scheduled) Menu path: BIDDING/Bidding running/Bid running status Description: Search Bidding StatusProcesses and functionalities Click BIDDING on first page Clicking Bid running status will display list of bids being submitted ※ Special notes 2 2 1 Materials 1 2 3. Bidding

4. Global POSCO Family 3 Screen Description: Can check detailed information about bidding method, bidding conditions, bidding time and purchase item set by buyer If buyer required bidding participation application, suppliers must fill out application form to participate in bidding If buyer required non-disclosure agreement, suppliers must sign non-disclosure agreement to participate in bidding Suppliers must sign bidding notice form to fill out tender document Bidding methodDisplay bidding method - Sealed bidding: Compare supplier quotes to award a bid. If it does not reach buyer’s target price, bidding starts again - Negotiation: Bidding is done through negotiations Bid typesBid type that determines whom to award a contract - Total amount system: Based on the total amount, supplier that presented lowest price will be determined as final bidder - Item by Item: Supplier that presented lowest price by item will be determined as final bidder Longest roundNumber of rounds that can be run longest: buyer fails a bid and receives quotes again in the next round and determines whom to award a contract (number of most rounds that can be run at this point) Cut OffNumber of suppliers that will be dropped when the next round is up Closing day and hour for bidding (Date and time when bid participation application finish) Time and date when bidding participation application closes If buyer required bidding participation application, suppliers must submit bidding participation application form before the deadline: if not, participating in bidding will be prohibited Bid day and hourBidding start date/time and end date/time Main currencyBase currency that can be used to compare quote prices presented by suppliers Currencies allowedCurrencies that are allowed for suppliers to use when submitting quotes Added conditionsAdditional conditions to a bid that buyer set - Total cost (price, non-price) purchase (not used) - Awarding of multiple bids allowed Other bidding termsOther terms regarding bidding

5. Global POSCO Family 4 Screen: Bidding Detail (In Progress) Menu path: BIDDING/Bidding running/Bid running status Description: Tender Creation ScreenProcesses and functionalities Click Case name on Bid running status list Click Prepare bid Read bidding instructions When pressing OK, bid instruction agreement pop-up window will appear Scroll down the agreement and check Agreed and press Confirm to see bid document page - Continued in the next slide ※ Special notes 4 2 1 Materials 1 3 4 5 2 4 3 5 3. Bidding

6. Global POSCO Family 55 Screen: Bidding Detail (In Progress) Menu path: BIDDING/Bidding running/Bid running status Description: Bid Creation ScreenProcesses and functionalities Select a currency Check delivery due date and quantity (move the scroll bar to the right) Insert bid unit price Confirm the bid price (it will be calculated automatically) Click Interim saving to save the bid Click Finalize bidding to save the bid document - Continued in the next page ※ Special notes: bid price is the total of each item (unit price X bid price) 3. Bidding Materials 1 2 3 4 5 1 2 3 4 5 6 6

7. Global POSCO Family 6 Screen Description: Fill out bid document and click Finalize bidding to submit a bid paper Until the bid closing time, bid document can be modified (even after the bid document is submitted, modification can be done if is before the bid closing time) Bid documents cannot be submitted after the bid closing time Bid PriceCurrency allowed for bidding: when the currency is changed, inserted bid unit price will be initialized Bid price will be calculated automatically (inserted unit price X quantity) Supplier commentsAdd comments to buyer Use Attach file button to send files to buyer Due dateDelivery due date: if buyer set in a way that delivery due date can be changed, supplier can present a due date QuantityPurchase quantity: when buyer set in a way quantity can be changed, supplier can present a quantity Bid unit priceInsert unit price: inserted unit price will have a comma every thousand won Delivery method - General - Courier Service

8. Global POSCO Family 77 Screen: Bidding Detail (In Progress) Menu path: BIDDING/Bidding running/Bid running status Description: Bid Creation ScreenProcesses and functionalities Click Finalize bidding Sanctioned supplier list will appear; click POSCO-Mexico list of suppliers sanctioned for unfair practices After checking the sanctioned supplier list, click The above details are confirmed - Continued in the next slide ※ Special notes 3. Bidding Materials 1 2 3 1 2 3 POSCO-Mexico

9. Global POSCO Family 88 Screen: Bidding Detail (In Progress) Menu path: BIDDING/Bidding running/Bid running status Description: Bid Creation ScreenProcesses and functionalities Check the sanctioned supplier list and click The above details will be confirmed When a pop-up opens confirming on sanctioned supplier, click Not included Click Participate in bidding after agreeing on the POSCO-Mexico sanction criteria compliance pop-up When bid completion pop-up appears, click OK When normal processing pop-up appears, click OK ※ Special notes 3. Bidding Materials 3 4 5 3 4 5 6 7 6 7 POSCO-Mexico

10. Global POSCO Family 9 Screen: Bidding Detail (In Progress) Menu path: BIDDING/Bidding running/Bid running status Description: Bid Creation ScreenProcesses and functionalities Click OK on “It has been duly processed,” and processed bid result will appear Bid information and purchase item list can be exported to an excel sheet ※ Special notes 9 3. Bidding Materials 8 9 7 8 9 9

11. Global POSCO Family 10 Screen: Bidding Detail (Contract awarded) Menu path: BIDDING/Bidding running/Bid running status Description: Contract Award ResultProcesses and functionalities When the bid fails, 2 nd Round of bidding begins When a final bidder is determined, clicking a case name will display contract-winning supplier and bid price Clicking Export on Purchase items table will enable bid contents to be downloaded in an excel format ※ Special notes: details of failed bids will not be accessible 10 3. Bidding 1 Materials 2 3 2 1 3

12. Global POSCO Family 11 Screen: Bidding Detail (Drawing lots) Menu path: BIDDING/Bidding running/Bid running status Description: Drawing Lots ScreenProcesses and functionalities Click Bid running status and list of bids will appear Click a bid case name if the Status is Draw Lots Click Drawing lots selection - Continued in the next slide ※ Special notes 11 3. Bidding 1 2 3 Drawing Lots 2 1 3

13. Global POSCO Family 12 Screen: Bidding Detail (Drawing lots) Menu path: BIDDING/Bidding running/Bid running status Description: Drawing Lots ScreenProcesses and functionalities Select a lot in the Drawing selection box and a flash screen will appear Click Check or Confirm Click Register and complete drawing lots setting ※ Special notes 12 3. Bidding 4 5 6 Drawing Lots 45 6

14. Global POSCO Family 13 Screen Description: When there are more than two suppliers that presented the same bid price, lots drawing will be used to determine the final bidder Suppliers will draw lots at a time buyer set Lots drawing result can be checked after the time buyer set Bidders/manufacturersSuppliers who need to draw lots StartSet a time for drawing lots to start for each supplier ClosingSet a time for drawing lots to end for each supplier Drawing selectionA list of lots to select from: after selecting a lot, click Check or Confirm After registering, a selected lot will be displayed Register buttonSave lots drawing settings and finish

15. Global POSCO Family 14 Screen: Bidding Detail (Drawing lots) Menu path: BIDDING/Bidding running/Bid running status Description: Drawing Lots Result ScreenProcesses and functionalities Click a case name on the Bid running status list Click View drawing lots results on detailed bidding screen Clicking View drawing lots result will display flash page showing drawing lots result and a successful bidder Click Confirm to accept the result ※ Special notes 14 3. Bidding 1 2 3 Drawing Lots 1 2 3 4 4

16. Global POSCO Family 15 Screen: Search bidding history Menu path: BIDDING/Query of statistics/Query of bidding participation history Description: Screen to Search Bidding History of Participated Suppliers Processes and functionalities Search participated bids and their details Set search terms and click Search - Query subject: Contract All/Successful Bid - Bid types: Bidding/Negotiation - Query period: from ~ to Click Case name to see details of a bid ※ Special notes : 3. Bidding 1 2 3 2 1 3 Common

17. Global POSCO Family 16 Screen: ITB Menu path: BIDDING/Bidding running/ITB Description: ITB List ScreenProcesses and functionalities Click ITB menu to move to ITB list screen Click Case name to check for details ※ Special notes 3. Bidding 1 2 1 2 Equipment/Construction

18. Global POSCO Family 17 Screen: ITB Menu path: BIDDING/Bidding running/ITB Description: Detailed ITB Search ScreenProcesses and functionalities Check ITB contents Click Confirm and send Buyer whether or not ITB has been searched/viewed ※ Special notes 3. Bidding Equipment/Construction 1 2 2 1

19. Global POSCO Family 18 Screen Description: For facility item purchase, buyer must send ITB before bidding When buyer set specification briefing date and venue, attend the briefing and learn about purchase items Create and submit specifications for purchase items before specification quote submission date Specification/site briefingIndicate briefing time and venue for purchase items Quote spec submission day and hour Last day when quote specifications for purchase items need to be submitted Quote spec submission place Venue where quote specifications for purchase items need to be submitted Bid scheduled day and hour Date and time when bidding is scheduled to take place Other termsMessages that buyer want to send to supplier are displayed Attached fileClicking this button will display a list of files that buyer wants to send to supplier