# EDGAR Filing Document

**Accession Number:** 0000886163
**File Stem:** 0001193125-25-324830
**Filing Date:** 2025-12
**Character Count:** 5133
**Document Hash:** e08b6289d7d56b464812f23352855c59
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-324830.hdr.sgml**: 20251218

**ACCESSION NUMBER**: 0001193125-25-324830

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 12

**CONFORMED PERIOD OF REPORT**: 20251218

**ITEM INFORMATION**: Regulation FD Disclosure

**FILED AS OF DATE**: 20251218

**DATE AS OF CHANGE**: 20251218

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** LIGAND PHARMACEUTICALS INC
- **CENTRAL INDEX KEY:** 0000886163
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 770160744
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-33093
- **FILM NUMBER:** 251583213

**BUSINESS ADDRESS:**
- **STREET 1:** 3911 SORRENTO VALLEY BLVD
- **STREET 2:** SUITE 110
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92121
- **BUSINESS PHONE:** 858-550-7500

**MAIL ADDRESS:**
- **STREET 1:** 3911 SORRENTO VALLEY BLVD
- **STREET 2:** SUITE 110
- **CITY:** SAN DIEGO
- **STATE:** CA
- **ZIP:** 92121

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

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

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): December 18, 2025

## LIGAND PHARMACEUTICALS INCORPORATED

#### (Exact Name of Registrant as Specified in Its Charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-33093** | **77-0160744** |
| **(State or other jurisdiction of**<br> **incorporation or organization)** | **(Commission**<br> **File Number)** | **(I.R.S. Employer**<br> **Identification No.)** |
| **555 Heritage Drive, Suite 200** |  |  |
| **Jupiter** |  |  |
| **Florida** |  | **33458** |
| **(Address of principal executive offices)** |  | **(Zip Code)** |

---

(858) 550-7500

#### (Registrant's Telephone Number, Including Area Code)

#### N/A

#### (Former Name or Former Address, if Changed Since Last Report)
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:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ 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** | **Name of each exchange<br>on which registered** |
| Common Stock, par value $0.001 per share LGND | The Nasdaq Global Market |

---

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) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

---

| | |
|:---|:---|
| **Item 7.01** | **Regulation FD Disclosure.**  |

---

On December 18, 2025, Ligand Pharmaceuticals Incorporated ("Ligand") posted materials regarding its private placement investment in Athira Pharma, Inc. on its investor relations page and certain of its social media accounts.

Ligand announces material information to the public through filings with the Securities and Exchange Commission, the investor relations page on Ligand's website, available at https://www.ligand.com/, press releases, public conference calls, webcasts, Ligand's X (Twitter) account (@Ligand_LGND) and Ligand's LinkedIn page, in order to achieve broad, non-exclusionary distribution of information to the public and for complying with its disclosure obligations under Regulation FD.

The information disclosed by the foregoing channels could be deemed to be material information. As such, Ligand encourages investors, the media and others to follow the channels listed above and to review the information disclosed through such channels. Any updates to the list of disclosure channels through which Ligand announces information will be posted on the investor relations page on Ligand's website.

------

#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | **LIGAND PHARMACEUTICALS INCORPORATED** | **LIGAND PHARMACEUTICALS INCORPORATED** |
| Date: December 18, 2025 | By: | /s/ Andrew Reardon |
|  | Name: | Andrew Reardon |
|  | Title: | Chief Legal Officer and Secretary |

---