Erik Ostrowski - 29 Jun 2026 Form 4 Insider Report for Akebia Therapeutics, Inc. (AKBA)

Reporting relationship: SVP, CFO, CBO & Treasurer
Issuer ticker: AKBA
Reported as of: 29 Jun 2026
Net transaction value: -$62,181
SEC form: 4
Accepted by SEC: 01 Jul 2026, 16:34:14 UTC
Prior SEC filing: 04 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Carolyn M. Rucci, attorney-in-fact for Erik Ostrowski

Key filing fact

Erik Ostrowski filed Form 4 for Akebia Therapeutics, Inc. (AKBA) on 01 Jul 2026.

Key facts

This page summarizes Erik Ostrowski's Form 4 filing for Akebia Therapeutics, Inc. (AKBA).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 01 Jul 2026, 16:34.

Change

Previous filing in this sequence was filed on 04 Feb 2026.
Current net transaction value: -$62,181.

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 0001762507 Primary reporting owner

Ostrowski Erik

Relationship: SVP, CFO, CBO & Treasurer
Address: C/O AKEBIA THERAPEUTICS, INC, 245 FIRST ST., CAMBRIDGE
Signature: /s/ Carolyn M. Rucci, attorney-in-fact for Erik Ostrowski
Signature date: 01 Jul 2026

Reported non-derivative transactions

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

AKBA transaction

Common Stock

Sale

Transaction value: $62,181
Shares: -56,019
Change %: -8.3%
Price: $1.11
Shares after: 616,616
Date: 29 Jun 2026
Ownership: Direct
Footnotes: F1

^* 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 1 footnote

Footnote F1

This sale represents an automatic "sell to cover" transaction to cover tax withholding obligations in connection with the vesting of restricted stock units granted on June 28, 2024. The sale was effected pursuant to durable automatic sell-to-cover instructions adopted by the reporting person on September 8, 2025.