As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Ardelyx, Inc. The largest reported stake is Rubric Capital Management LP's, at 6.56%. 12 filings are on record since July 29, 2025 (Schedule 13G, August 14, 2026).
Sell to companies like Ardelyx, Inc? Enter your website and see 10 with a filed reason to buy from you this month. Free.
Opens in a new tab. No signup.
Key facts
- · Reporting person: Rubric Capital Management LP · Sole voting: 0 · Shared voting: 16,202,700 · Sole dispositive: 0 · Shared dispositive: 16,202,700 · SCHEDULE 13G, 2026-08-14
- · Reporting person: Integrated Core Strategies (US) LLC · Sole voting: 0 · Shared voting: 12,030,115 · Sole dispositive: 0 · Shared dispositive: 12,030,115 · SCHEDULE 13G/A, 2026-08-11
- · Reporting person: Janus Henderson Group Plc · Sole voting: 0 · Shared voting: 8,371,234 · Sole dispositive: 0 · Shared dispositive: 8,371,234 · SCHEDULE 13G/A, 2026-05-15
- · Reporting person: State Street Corporation · Sole voting: 0 · Shared voting: 12,897,628 · Sole dispositive: 0 · Shared dispositive: 13,604,307 · SCHEDULE 13G, 2026-05-12
- · Holder: Millennium Management LLC · Percent: 7.4% · SCHEDULE 13G/A
Ardelyx, Inc. has 12 Schedule 13D or 13G filings on record since 2025-07-29. 3 holders' latest filing reports 5% or more of common stock, $0.001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Rubric Capital Management LP | 6.56% | 16,202,700 | SCHEDULE 13G, 2026-08-14 | 2026-06-30 |
| Millennium Management LLC | 5.7% | 14,200,773 | SCHEDULE 13G/A, 2026-08-11 | 2026-06-30 |
| State Street Corporation | 5.5% | 13,604,307 | SCHEDULE 13G, 2026-05-12 | 2026-03-31 |
| Janus Henderson Group Plc | 3.4% | 8,371,234 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Millennium Management LLC | 3.2% | 7,671,987 | SCHEDULE 13G/A, 2025-10-28 | 2025-09-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
Holding shares or following this stake? See who's behind Ardelyx, Inc. and the warning signs.
Free to see. No signup.
Keep reading
More on Ardelyx, Inc. and the records around it.
Ardelyx, Inc. elsewhere on the record
Companies that share a holder
- Rubric Capital Management LP also filed stake reports on 32 other companies: Enovis Corporation (Aug 2026), MeiraGTx Holdings plc (Aug 2026), Mission Produce, Inc. (Aug 2026)
- Integrated Core Strategies (US) LLC also filed stake reports on 63 other companies: Infinite Eagle Acquisition Corp. (Nov 2026), Longeveron Inc. (Nov 2026), Edesa Biotech, Inc. (Nov 2026)
- JANUS HENDERSON GROUP PLC also filed stake reports on 104 other companies: SURGERY PARTNERS, INC. (Nov 2026), EYEPOINT, INC. (Sep 2026), TELEFLEX INCORPORATED (Sep 2026)
Watch Ardelyx, Inc.
Get an email when Ardelyx, Inc. files again: a new raise, a leadership change, a layoff or an IPO filing. One email first to confirm; nothing else until you click it. At most one a day, one click to stop. Free for up to 3 companies.
Want the whole picture on Ardelyx, Inc.?
Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
A Full Report on Ardelyx, Inc.: verified, sourced, every claim cited, ready in a few minutes. See pricing.
What the Full Report on Ardelyx, Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
12 cited sources found
Plus the sections for what you are deciding, which you pick after ordering.
A real finished report, first screen. Opens in a new tab.
Not ready to order yet? Keep this snapshot.
Sends this preview to you once; we won't add you to any list
Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Rubric Capital Management LP | 0 | 16,202,700 | 0 | 16,202,700 | SCHEDULE 13G, 2026-08-14 |
| David Rosen | 0 | 16,202,700 | 0 | 16,202,700 | SCHEDULE 13G, 2026-08-14 |
| Integrated Core Strategies (US) LLC | 0 | 12,030,115 | 0 | 12,030,115 | SCHEDULE 13G/A, 2026-08-11 |
| Millennium Management LLC | 0 | 14,200,773 | 0 | 14,200,773 | SCHEDULE 13G/A, 2026-08-11 |
| Millennium Group Management LLC | 0 | 14,200,773 | 0 | 14,200,773 | SCHEDULE 13G/A, 2026-08-11 |
| Israel A. Englander | 0 | 14,200,773 | 0 | 14,200,773 | SCHEDULE 13G/A, 2026-08-11 |
| State Street Corporation | 0 | 12,897,628 | 0 | 13,604,307 | SCHEDULE 13G, 2026-05-12 |
| Janus Henderson Group Plc | 0 | 8,371,234 | 0 | 8,371,234 | SCHEDULE 13G/A, 2026-05-15 |
The latest filing identifies Ardelyx, Inc. by CUSIP 039697107 and gives its principal executive office as 34175 ARDENWOOD BLVD., Fremont, CA 94555 (SCHEDULE 13G, 2026-08-14).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-29 | The Vanguard Group | 6.7% | SCHEDULE 13G/A |
| 2025-08-14 | Janus Henderson Group Plc | 6.3% | SCHEDULE 13G/A |
| 2025-10-28 | Millennium Management LLC | 3.2% | SCHEDULE 13G/A |
| 2025-11-14 | Janus Henderson Group Plc | 5.7% | SCHEDULE 13G/A |
| 2026-01-12 | Millennium Management LLC | 5.4% | SCHEDULE 13G |
| 2026-01-30 | The Vanguard Group | 7.81% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-27 | Millennium Management LLC | 7.4% | SCHEDULE 13G/A |
| 2026-05-12 | State Street Corporation | 5.5% | SCHEDULE 13G |
| 2026-05-15 | Janus Henderson Group Plc | 3.4% | SCHEDULE 13G/A |
| 2026-08-11 | Millennium Management LLC | 5.7% | SCHEDULE 13G/A |
| 2026-08-14 | Rubric Capital Management LP | 6.56% | SCHEDULE 13G |
Questions about who owns Ardelyx, Inc.
Who owns Ardelyx, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of Ardelyx, Inc.: Rubric Capital Management LP (6.56%, Schedule 13G, filed 2026-08-14), Millennium Management LLC (5.7%, Schedule 13G/A, filed 2026-08-11) and State Street Corporation (5.5%, Schedule 13G, filed 2026-05-12).
Who are the largest shareholders of Ardelyx, Inc.?
By the share each holder's latest filing reports, the largest holders of Ardelyx, Inc. on this page are Rubric Capital Management LP (6.56%), Millennium Management LLC (5.7%) and State Street Corporation (5.5%).
When did Rubric Capital Management LP buy into Ardelyx, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Rubric Capital Management LP on this page is the Schedule 13G, filed 2026-08-14, reporting 6.56%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Tools for this story
Each opens in a new tab, filled in for Ardelyx, Inc.. With no account yet, you sign up free and land on the result.
Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.