Helen Torley - 06 Oct 2026 Form 4 Insider Report for HALOZYME THERAPEUTICS, INC. (HALO)

Reporting relationship: PRESIDENT AND CEO, Director
Issuer ticker: HALO
Reported as of: 06 Oct 2026
Net transaction value: -$6,610,501
SEC form: 4
Accepted by SEC: 08 Oct 2026, 19:56:19 UTC
Prior SEC filing: 11 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ James R. Oehler, Attorney-in-Fact

Key filing fact

Helen Torley filed Form 4 for HALOZYME THERAPEUTICS, INC. (HALO) on 08 Oct 2026.

Key facts

This page summarizes Helen Torley's Form 4 filing for HALOZYME THERAPEUTICS, INC. (HALO).
18 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 08 Oct 2026, 19:56.

Change

Previous filing in this sequence was filed on 11 Sep 2026.
Current net transaction value: -$6,610,501.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001528185 Primary reporting owner

Torley Helen

Relationship: PRESIDENT AND CEO, Director
Address: C/O HALOZYME THERAPEUTICS, INC., 12390 EL CAMINO REAL, SAN DIEGO
Signature: /s/ James R. Oehler, Attorney-in-Fact
Signature date: 08 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

HALO transaction

Common Stock

Options Exercise

Transaction value
Shares: +20,000
Change %: +2.6%
Price: $18.41^*
Shares after: 787,780
Date: 06 Oct 2026
Ownership: Direct
Footnotes: F1

HALO transaction

Common Stock

Sale

Transaction value: $248,175
Shares: -2,300
Change %: -0.29%
Price: $107.90
Shares after: 785,480
Date: 06 Oct 2026
Ownership: Direct
Footnotes: F1, F2

HALO transaction

Common Stock

Sale

Transaction value: $656,004
Shares: -6,000
Change %: -0.76%
Price: $109.33
Shares after: 779,480
Date: 06 Oct 2026
Ownership: Direct
Footnotes: F1, F3

HALO transaction

Common Stock

Sale

Transaction value: $1,090,119
Shares: -9,920
Change %: -1.3%
Price: $109.89
Shares after: 769,560
Date: 06 Oct 2026
Ownership: Direct
Footnotes: F1, F4

HALO transaction

Common Stock

Sale

Transaction value: $197,245
Shares: -1,780
Change %: -0.23%
Price: $110.81
Shares after: 767,780
Date: 06 Oct 2026
Ownership: Direct
Footnotes: F1, F5

HALO transaction

Common Stock

Options Exercise

Transaction value
Shares: +20,000
Change %: +2.6%
Price: $18.41^*
Shares after: 787,780
Date: 07 Oct 2026
Ownership: Direct
Footnotes: F1

HALO transaction

Common Stock

Sale

Transaction value: $954,867
Shares: -8,600
Change %: -1.1%
Price: $111.03
Shares after: 779,180
Date: 07 Oct 2026
Ownership: Direct
Footnotes: F1, F6

HALO transaction

Common Stock

Sale

Transaction value: $1,151,942
Shares: -10,300
Change %: -1.3%
Price: $111.84
Shares after: 768,880
Date: 07 Oct 2026
Ownership: Direct
Footnotes: F1, F7

HALO transaction

Common Stock

Sale

Transaction value: $101,502
Shares: -900
Change %: -0.12%
Price: $112.78
Shares after: 767,980
Date: 07 Oct 2026
Ownership: Direct
Footnotes: F1, F8

HALO transaction

Common Stock

Sale

Transaction value: $22,739
Shares: -200
Change %: -0.03%
Price: $113.69
Shares after: 767,780
Date: 07 Oct 2026
Ownership: Direct
Footnotes: F1, F9

HALO transaction

Common Stock

Options Exercise

Transaction value
Shares: +20,000
Change %: +2.6%
Price: $18.41^*
Shares after: 787,780
Date: 08 Oct 2026
Ownership: Direct
Footnotes: F1

HALO transaction

Common Stock

Sale

Transaction value: $520,341
Shares: -4,810
Change %: -0.61%
Price: $108.18
Shares after: 782,970
Date: 08 Oct 2026
Ownership: Direct
Footnotes: F1, F10

HALO transaction

Common Stock

Sale

Transaction value: $336,526
Shares: -3,090
Change %: -0.39%
Price: $108.91
Shares after: 779,880
Date: 08 Oct 2026
Ownership: Direct
Footnotes: F1, F11

HALO transaction

Common Stock

Sale

Transaction value: $1,308,940
Shares: -11,900
Change %: -1.5%
Price: $110.00
Shares after: 767,980
Date: 08 Oct 2026
Ownership: Direct
Footnotes: F1, F12

HALO transaction

Common Stock

Sale

Transaction value: $22,102
Shares: -200
Change %: -0.03%
Price: $110.51
Shares after: 767,780
Date: 08 Oct 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

HALO transaction Derivative

Option to Purchase Common Stock

Options Exercise

Transaction value
Shares: -20,000
Change %: -25%
Price: $18.41^*
Shares after: 61,552
Date: 06 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 20,000
Exercise price: $18.41
Footnotes: F1, F13

HALO transaction Derivative

Option to Purchase Common Stock

Options Exercise

Transaction value
Shares: -20,000
Change %: -32%
Price: $18.41^*
Shares after: 41,552
Date: 07 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 20,000
Exercise price: $18.41
Footnotes: F1, F13

HALO transaction Derivative

Option to Purchase Common Stock

Options Exercise

Transaction value
Shares: -20,000
Change %: -48%
Price: $18.41^*
Shares after: 21,552
Date: 08 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 20,000
Exercise price: $18.41
Footnotes: F1, F13

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 13 footnotes

Footnote F1

The options exercised and sales reported on this Form 4 were made pursuant to a written trading plan adopted by the Reporting Person on December 3, 2025 in accordance with Rule 10b5-1. The sales of common shares reported on this Form 4 represent shares that were acquired following exercise of stock options with a ten-year term expiring in February 2028.

Footnote F2

Represents a weighted average sales price per share. The shares were sold at prices ranging from $107.480 to $108.290. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F3

Represents a weighted average sales price per share. The shares were sold at prices ranging from $108.530 to $109.520. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F4

Represents a weighted average sales price per share. The shares were sold at prices ranging from $109.530 to $110.510. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F5

Represents a weighted average sales price per share. The shares were sold at prices ranging from $110.530 to $111.210. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F6

Represents a weighted average sales price per share. The shares were sold at prices ranging from $110.360 to $111.350. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F7

Represents a weighted average sales price per share. The shares were sold at prices ranging from $111.380 to $112.360. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F8

Represents a weighted average sales price per share. The shares were sold at prices ranging from $112.400 to $113.190. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F9

Represents a weighted average sales price per share. The shares were sold at prices ranging from $113.590 to $113.860. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F10

Represents a weighted average sales price per share. The shares were sold at prices ranging from $107.480 to $108.475. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F11

Represents a weighted average sales price per share. The shares were sold at prices ranging from $108.480 to $109.470. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F12

Represents a weighted average sales price per share. The shares were sold at prices ranging from $109.510 to $110.500. The Reporting Person has provided to the issuer, and will provide to any security holder of the issuer or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.

Footnote F13

Grant to Reporting Person of options, exercisable over a 4-year period measured from the date of grant, 25% after 12 months, then 1/48th of the Option Shares per month thereafter. The date of grant was February 14, 2018.