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Adage Capital Management, L.P.

CIK 1535978 · last filed 2025-10-17

Adage Capital Management, L.P. is a corporate insider who has filed 2 SEC Form 4 insider transactions across 2 companies since 2025. The most recent filing shows the insider sold $99.6M of PRAX on Oct 17, 2025. Across all open-market trades the lifetime net is +$105.3M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $694.0M across reported positions. The firm reports its address in Boston, MA. 7 SEC filings were submitted jointly with Robert Atchinson.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$694.04M

Companies

2

Total Filings

2

Lifetime Open-Market Net

$105.32M

Filer Profile

Reported Address
200 CLARENDON STREET, 52ND FLOOR
BOSTON, MA 02116
Phone
(617) 867-2800
State of Incorporation
DE
Related Filers
Robert Atchinson — 7 joint filings, latest 2025-10-17
Phillip Gross — 7 joint filings, latest 2025-10-17
Tango Therapeutics, Inc. — 5 joint filings, latest 2026-08-12
ADAGE CAPITAL PARTNERS GP, L.L.C. — 1 joint filings, latest 2023-07-10
Adage Capital Partners, L.P. — 1 joint filings, latest 2023-07-10
Amalgamated Financial Corp. — 1 joint filings, latest 2024-11-12
Inozyme Pharma, Inc. — 1 joint filings, latest 2025-08-12
Perella Weinberg Partners — 1 joint filings, latest 2024-11-12
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
PRAX 10%+ Owner 2,359,116 $281.04 $663.01M $99.59M 1 2025-10-17
SLDB 10%+ Owner 4,248,084 $7.30 $31.03M $5.73M 1 2025-02-19

Recent Filings

2 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2025-10-17 PRAX Sell (S) +941,730 $99.59M EDGAR
2025-02-19 SLDB Buy (P) +757,635 $5.73M EDGAR
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.