Company: PACB
Filing Date: 2025-02-07
Form Type: 8-K/A
Source: 0001299130-25-000027
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Company: PACIFIC BIOSCIENCES OF CALIFORNIA, INC.
Filing Date: 2025-02-07
Form: 8-K/A
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, DC 20549

#### FORM 8-K/A

#### Amendment No. 1

### CURRENT REPORT

#### Pursuant to Section 13 or 15(d) of

#### The Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported)

#### January 24, 2025

#### Pacific Biosciences of California, Inc.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Delaware                     |     | 001-34899   |     | 16-1590339         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission 
 File Number |     | -IRS Employer      
 Identification No. |

#### 1305 O’Brien Drive

#### Menlo Park, California 94025
<div align='center'>(Address of principal executive offices) (Zip Code)

( 650) 521-8000

(Registrant’s telephone number, including area code)

(Former name or former address, if changed since last report)</div>

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

| o |     | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)                  |
| o |     | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)                 |
| o |     | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |
| o |     | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

Securities registered pursuant to Section 12(b) of the Act:

| Title of each class                      |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Common Stock, par value $0.001 per share |     | PACB              |     | The NASDAQ Stock Market LLC               |

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter