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SCHEDULE 13D/A Filed 2026-05-15 Event 2026-05-14 SEC 0001213900-26-057369 →

Weichai Power Hong Kong International Development Co., Ltd Ballard Power Systems Inc. BLDP

Stake: 11.61% Shares: 34,999,826 CUSIP: 058586108 Class: Common Shares

Item 4 — Purpose of Transaction

Item 4 of the Schedule 13D is hereby amended in its entirety as follows: The information contained in Item 3 above is herein incorporated by reference. The Reporting Persons acquired securities of the Issuer for investment purposes. Investor Rights Agreement Pursuant to the Investor Rights Agreement, for so long as Weichai Hong Kong beneficially owns a number of Common Shares that is equal to at least 15% of the total outstanding Common Shares of the Issuer, Weichai Hong Kong will be entitled to designate two (2) individuals for appointment or election to the Issuer's board of directors (the "Board"). Such directors appointed by Weichai Hong Kong must resign within 10 business days after Weichai Hong Kong ceases to beneficially own at least 15% of the total outstanding Common Shares of the Issuer. As of May 8, 2026, Weichai Hong Kong beneficially owned less than 15% of the total outstanding Common Shares of the Issuer. As a result, Michael Chen and Huajie Wang, two directors appointed by Weichai Hong Kong, have resigned from the Board, effective as of May 13, 2026, as disclosed on the Issuer's Form 6-K filed with the SEC on May 15, 2026. As of the date hereof, no director of the Issuer is appointed by Weichai Hong Kong. The Investor Rights Agreement also contains restrictions on dispositions which prohibit Weichai Hong Kong from selling or transferring the Subscription Shares for a period of two (2) years following the Closing Date, subject to customary exceptions for transfers to affiliates and participation in material transactions involving the Issuer. Such restrictions on disposition have expired as of November 12, 2020. The Investor Rights Agreement also contains customary standstill restrictions which prohibit Weichai Hong Kong from acquiring beneficial ownership of additional Common Shares or taking other specified actions with respect to the Issuer for two (2) years following the Closing Date. Such standstill restrictions have expired as of November 12, 2020. The Investor Rights Agreement also provides Weichai Hong Kong with anti-dilution rights to maintain its ownership position in the Issuer, pursuant to which Weichai Hong Kong has a right to purchase a pro rata portion of any new issue of securities, or at-the-market offering of securities, issued by the Issuer, including Common Share and convertible share (excluding certain excepted issuances). Such anti-dilution rights are effective as long as Weichai Hong Kong owns 10% or more of Ballard's Common Shares, but will expire when Weichai Hong Kong's shareholding falls below 10%. The Investor Rights Agreement also provides a superior proposal right pursuant to which the Issuer must notify Weichai Hong Kong if it receives an acquisition proposal from a third party which will constitute a change of control transaction and determines it could constitute a transaction that it recommends to its shareholders. Within 20 business days upon notice, Weichai Hong Kong has a right to submit a superior proposal to compete against the third-party offer, or it will choose to support the proposed transaction. The foregoing descriptions of the Weichai Subscription Agreement, the Investor Rights Agreement, and the transactions contemplated thereby, are not intended to be complete and are qualified in their entirety by reference to the Weichai Subscription Agreement, the original Investor Rights Agreement, and the amended and restated Investor Rights Agreement, copies of which are filed as Exhibit B, C, F hereto, respectively, and which are incorporated herein by reference. In their capacity as a significant shareholder of the Issuer, the Reporting Persons review and intend to continue to review, on an ongoing and continuing basis, their investment in the Issuer. Depending upon the factors discussed below and subject to applicable law and the terms of the Weichai Subscription Agreement and the Investor Rights Agreement, the Reporting Persons may from time to time acquire additional securities of the Issuer or sell or otherwise dispose of some or all of their securities of the Issuer. Subject to applicable law and the terms of the Weichai Subscription Agreement and Investor Rights Agreement, any transactions that the Reporting Persons may pursue may be made at any time and from time to time, with or without prior notice, and will depend upon a variety of factors, including, without limitation, current and anticipated future trading prices of the securities of the Issuer, the financial condition, results of operations and prospects of the Issuer, general economic, financial market and industry conditions, other investment and business opportunities available to the Reporting Persons, tax considerations and other factors. Specifically, on May 8, 2026, Weichai Hong Kong filed a Form 144 with the SEC, which relates to its proposed sale of up to 15,028,886 Common Shares in accordance with Rule 144. Weichai Hong Kong has sold and intends to continue to sell Common Shares in

Cross-References

Insider Activity (last 365d)
0 transactions
0 buys · 0 sales · 0 awards/exercises
Issuer Cluster
3 13D/G filings on this issuer
2 other filings besides this one
Filer Track Record
3 filings by this filer
2 other filings in the data moat
Short Interest · settle 2026-04-30
DTC 4.58
21,027,098 shares short · +1.4% vs prior

Other 13D/G Filings on Ballard Power Systems Inc.

FiledFormFilerStakeShares
2026-05-19 SCHEDULE 13D/A Weichai Power Hong Kong International Development Co., Ltd 10.32% 31,102,826 view →
2026-05-13 SCHEDULE 13D/A Weichai Power Hong Kong International Development Co., Ltd 39,252,826 view →

Other Filings by Weichai Power Hong Kong International Development Co., Ltd

FiledFormIssuerStakeShares
2026-05-19 SCHEDULE 13D/A Ballard Power Systems Inc. 10.32% 31,102,826 view →
2026-05-13 SCHEDULE 13D/A Ballard Power Systems Inc. 39,252,826 view →

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