Company · Ownership research

CoastalSouth Bancshares, Inc. COSO

CIK 0001297107

Form 4 transactions dated Nov 1, 2023 to Nov 8, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through Nov 4, 2026.

Insider purchases & sales

Purchased: $3.58M
Sold: $450.59K

Nov 1, 2023 – Nov 4, 2026
Available records · partial months are marked ·

202610 of 10 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Oct 23, 2026	Bruderer Ernst W. Director	Sale	$167.49K 6,000 shares sold	14.59% sold Direct holding	▾
Aug 31, 2026	Bruderer Ernst W. Director	Sale	$54.86K 2,000 shares sold	4.64% sold Direct holding	▾
Aug 26, 2026	Bruderer Ernst W. Director	Sale	$55.00K 2,000 shares sold	4.43% sold Direct holding	▾
Aug 18, 2026	Bruderer Ernst W. Director	Sale	$27.89K 1,000 shares sold	2.17% sold Direct holding	▾
Aug 12, 2026	Bruderer Ernst W. Director	Sale	$27.56K 1,000 shares sold	2.12% sold Direct holding	▾
Aug 7, 2026	MACLEOD JAMES S Director	Purchase	$6.70K 238 shares bought	0.12% added Direct holding	▾
Aug 6, 2026	MACLEOD JAMES S Director	Purchase	$2.65K 96 shares bought	0.05% added Direct holding	▾
May 6, 2026	Valduga Anthony P. CFO AND COO	Sale	$117.78K 4,558 shares sold	5.03% sold Direct holding	▾
Mar 9, 2026	Stone Stephen R. PRESIDENT AND CEO · Director	Purchase	$4.83K 200 shares bought	0.17% added Direct holding	▾
Feb 10, 2026	HIGH MICHAEL B Director	Purchase	$37.71K 1,500 shares bought	New holding Indirect holding	▾

Showing 10 / 10 record groups in 2026. The complete set is available through the API.

CoastalSouth Bancshares, Inc. · COSO

Follow the people behind the trades.

Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and reach other datasets through the Akkru API.

Download CSV
Earlier filings
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 10 of 10 purchase / sale groups and 29 of 29 other groups; the totals and the monthly series cover the whole window.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

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

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

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. Share totals are on today's split-adjusted basis. 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.