Company · Ownership research

CoastalSouth Bancshares, Inc. COSO

CIK 0001297107

Form 4 transactions dated Sep 1, 2023 to Sep 23, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through 2026-08-31.

Insider purchases & sales

Purchased: $3.57M
Sold: $283.09K

Sep 1, 2023 – Aug 31, 2026
Available records · partial months are marked ·

20267 of 7 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2026-08-31	Bruderer Ernst W. Director	Sale	$54.86K 2,000 shares sold	4.64% sold Direct holding	▾
2026-08-26	Bruderer Ernst W. Director	Sale	$55.00K 2,000 shares sold	4.43% sold Direct holding	▾
2026-08-18	Bruderer Ernst W. Director	Sale	$27.89K 1,000 shares sold	2.17% sold Direct holding	▾
2026-08-12	Bruderer Ernst W. Director	Sale	$27.56K 1,000 shares sold	2.12% sold Direct holding	▾
2026-05-06	Valduga Anthony P. CFO AND COO	Sale	$117.78K 4,558 shares sold	5.03% sold Direct holding	▾
2026-03-09	Stone Stephen R. PRESIDENT AND CEO · Director	Purchase	$4.83K 200 shares bought	0.17% added Direct holding	▾
2026-02-10	HIGH MICHAEL B Director	Purchase	$37.71K 1,500 shares bought	New holding Indirect holding	▾

Showing 7 / 7 record groups in 2026. The complete set is available through the API.

CoastalSouth Bancshares, Inc. · COSO

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{"ticker":"COSO","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.