Company: PAGP
Filing Date: 2025-04-11
Form Type: DEFA14A
Source: 0001104659-25-033939
Chunk: 0

Company: PLAINS GP HOLDINGS LP
Filing Date: 2025-04-11
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934 (Amendment No. )</div>

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

| ¨ | Preliminary Proxy Statement |

| ¨ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |

| ¨ | Definitive Proxy Statement |

| x | Definitive Additional Materials |

| ¨ | Soliciting Material under §240.14a-12 |

<div align='center'>PLAINS GP HOLDINGS, L.P.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other
than the Registrant)</div>

Payment of Filing Fee (Check the appropriate box):

| x | No fee required. |

| ¨ | Fee paid previously with preliminary materials. |

| ¨ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0 -11. |