James G Coulter and 2 Others Buys $950K of Sionna Therapeutics Inc (SION) — SEC Form 4, Jul 01, 2025

Open-Market Net Purchase · SEC Form 4
+$950,400

Equity position changed by +0.9%

Reporting Owners
James G Coulter
10%+
Jon Winkelried
10%+
Tpg Gp A, LLC
10%+
TXN 2025-06-27 · FILED 2025-07-01
Equity Position 6.74M sh 6,684,962 → 6,744,962
Equity Change +0.9% shares held after vs before
Filing Lag 2 business days within 2-day SEC deadline
Form 4 · Statement of Changes in Beneficial Ownership

Sionna Therapeutics Inc

SION CIK 0002036042
All Sionna Therapeutics Inc insider activity
Filing Date
2025-07-01
Report Date
2025-06-27
Accession No.
0001999371-25-008631
Accepted At
2025-07-01 21:03 UTC
Reporting Owners
Name Relationship
James G Coulter CIK 0001099776
10% Owner
Jon Winkelried CIK 0001366946
10% Owner
Tpg Gp A, LLC CIK 0001903793
10% Owner
James G Coulter at Sionna Therapeutics Inc Full insider history
Bought (12 mo) —
Sold (12 mo) $10,000,000
More from this insider at Sionna Therapeutics Inc
2026-01-26 Sell -$10,000,000 View
2025-02-12 Buy +$20,250,000 View
All filings by this insider at Sionna Therapeutics Inc
Non-Derivative Securities Transactions
Title Date Type Shares Price Net Total Post-Txn Ownership
Common StockF1F2F3F4 2025-06-27 P - Purchase 60,000 A $15.84 +$950,400 6,744,962 Indirect See Explanation of Responses
Footnotes (4)
F1
Each of James G. Coulter and Jon Winkelried own entities that control TPG GP A, LLC (together with Messrs. Coulter and Winkelried, the "Reporting Persons"), which is the managing member of each of (i) TPG Group Holdings (SBS) Advisors, LLC, which is the general partner of TPG Group Holdings (SBS), L.P., and (ii) Alabama Investments (Parallel) GP, LLC, which is the general partner of each of (a) Alabama Investments (Parallel), LP, (b) Alabama Investments (Parallel) Founder A, LP and (c) Alabama Investments (Parallel) Founder G, LP, which, collectively with TPG Group Holdings (SBS), L.P., Alabama Investments (Parallel), LP and Alabama Investments (Parallel) Founder A, LP, holds 100% of the shares of Class B common stock (which represents a majority of the combined voting power of the common stock) of TPG Inc. Show more
F2
TPG Inc. is the sole member of TPG GPCo, LLC, which is the sole member of TPG Holdings II-A, LLC, which is the general partner of TPG Operating Group II, L.P., which is the sole member of TPG Holdings I-A, LLC, which is the general partner of TPG Operating Group I, L.P., which is the sole member of The Rise Fund GenPar Advisors, LLC, which is the general partner of The Rise Fund GenPar, L.P., which is the managing member of The Rise Fund SPV GP, LLC, which is the general partner of each of The Rise Fund Sling, L.P., which directly holds 5,536,598 shares of Common Stock ("Common Stock") of Sionna Therapeutics, Inc. (the "Issuer"), and The Rise Fund Sling II, L.P. (together with The Rise Fund Sling, L.P., the "TPG Funds"), which directly holds 1,208,364 shares of Common Stock. Show more
F3
Because of the relationship between the Reporting Persons and the TPG Funds, the Reporting Persons may be deemed to beneficially own the securities reported herein to the extent of the greater of their respective direct or indirect pecuniary interests in the profits or capital accounts of the TPG Funds. Each of the TPG Funds and each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such TPG Fund's or such Reporting Person's pecuniary interest therein, if any. Show more
F4
Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), this filing shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owners of any equity securities in excess of their respective pecuniary interests. Show more
Remarks

5. The Reporting Persons are jointly filing this Form 4 pursuant to Rule 16a-3(j) under the Exchange Act. 6. Gerald Neugebauer is signing on behalf of Messrs. Coulter and Winkelried pursuant to authorization and designation letters dated January 10, 2024, which were previously filed with the Securities and Exchange Commission.

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Related filings at Sionna Therapeutics Inc

Institutional Holders
13F holders · Jun 30, 2026 145 institutional managers reporting a position
Largest by reported value
  1. Ra Capital Management, L.P. $436M
  2. Tpg Gp A, Llc $286M
  3. Viking Global Investors Lp $141M
5%+ Holders · 13D/G 6 filers

Latest Schedule 13D/G per filer; stakes the filer reported closed are left out.

Other insiders at Sionna Therapeutics Inc
All Sionna Therapeutics Inc insider activity
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