Company · Ownership research

Spero Therapeutics, Inc. SPRO

CIK 0001701108

Form 4 transactions dated Nov 1, 2023 to Nov 15, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through Nov 10, 2026.

Insider purchases & sales

Purchased: $0.00
Sold: $1.27M

Nov 1, 2023 – Nov 10, 2026
Available records · partial months are marked ·

202410 of 13 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Nov 8, 2024	Rajavelu Esther CFO & CBO	Sale	$22.42K 17,245 shares sold	4.35% sold Direct holding	▾
Nov 7, 2024	Rajavelu Esther CFO & CBO	Sale	$30.59K 23,351 shares sold	5.56% sold Direct holding	▾
Aug 27, 2024	Mahadevia Ankit Director	Sale	$7.98K 5,912 shares sold	0.77% sold Direct holding	▾
Aug 27, 2024	Keutzer Timothy Chief Operating Officer	Sale	$2.99K 2,213 shares sold	0.41% sold Direct holding	▾
Aug 27, 2024	Shukla Sath CEO & President	Sale	$3.72K 2,757 shares sold	0.24% sold Direct holding	▾
Aug 5, 2024	Shukla Sath CEO and President	Sale	$23.11K 17,641 shares sold	1.52% sold Direct holding	▾
Aug 2, 2024	Shukla Sath CEO and President	Sale	$19.54K 14,800 shares sold	1.26% sold Direct holding	▾
Feb 5, 2024	Shukla Sath CEO and President · Director	Sale10b5-1 footnote	$65.38K 45,093 shares sold	3.69% sold Direct holding	▾
Feb 2, 2024	Keutzer Timothy Chief Operating Officer	Sale	$42.12K 30,971 shares sold	5.48% sold Direct holding	▾
Feb 2, 2024	Mahadevia Ankit Director	Sale	$87.40K 63,795 shares sold	7.89% sold Direct holding	▾

Showing 13 / 13 record groups in 2024. The complete set is available through the API.

Spero Therapeutics, Inc. · SPRO

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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 13 of 13 purchase / sale groups and 14 of 14 other groups; the totals and the monthly series cover the whole window.

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{"action":"list","ticker":"SPRO","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. 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.