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Magnetar Capital Partners LP

CIK 1353085 · last filed 2026-08-14

Magnetar Capital Partners LP is a corporate insider who has filed 39 SEC Form 4 insider transactions across 5 companies since 2007. The most recent filing shows the insider sold $926.4M of CRWV on Aug 14, 2026. Across all open-market trades the lifetime net is −$6.79B, making them a net seller over the disclosed history. Current disclosed insider exposure totals $165.9M across reported positions. The firm reports its address in Evanston, IL. 174 SEC filings were submitted jointly with Supernova Management LLC.

"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

$165.92M

Companies

5

Total Filings

39

Lifetime Open-Market Net

-$6.79B

Filer Profile

Reported Address
1603 ORRINGTON AVE.
13TH FLOOR
EVANSTON, IL 60201
Phone
(847) 905-4400
State of Incorporation
DE
Formerly Known As
Magnetar Capital Partners LLC (2006–2006)
Related Filers
Supernova Management LLC — 174 joint filings, latest 2026-08-18
Magnetar Financial LLC — 168 joint filings, latest 2026-08-18
David J. Snyderman — 151 joint filings, latest 2026-08-18
CW Opportunity LLC — 1 joint filings, latest 2026-08-03
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
CRWV 10%+ Owner 1,954,824 $84.35 $164.89M -$6.74B 33 2026-08-14
WHLRP 10%+ Owner 108,973 $9.50 $1.04M -$85.4K 1 2026-04-09
Rithm Property Trust Inc. (AJXA) Delisted 10%+ Owner 156,400 $25.07 $3.92M -$39.21M 2 2022-07-28
KINTERA INC (UNCL) Delisted 10%+ Owner 3,971,990 — — -$2.40M 2 2008-05-19
ATLAS ENERGY, INC. (ATLS) Delisted 10%+ Owner 3,982,545 — — -$9.60M 1 2008-04-15

Recent Filings

39 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
2026-08-14 CRWV Sell (S) −8,591,484 -$926.41M EDGAR
2026-08-14 CRWV Sell (S) — $0 EDGAR
2026-08-14 CRWV Sell (S) — $0 EDGAR
2026-06-23 CRWV E — $0 EDGAR
2026-06-03 CRWV Sell (S) — $0 EDGAR
2026-05-08 CRWV Sell (S) −2,348,040 -$305.03M EDGAR
2026-05-08 CRWV Sell (S) −4,810,624 -$657.76M EDGAR
2026-05-08 CRWV Sell (S) — $0 EDGAR
2026-05-06 CRWV Sell (S) −1,397,748 -$178.46M EDGAR
2026-05-06 CRWV Sell (S) — $0 EDGAR
Showing 1–10 of 39
Page 1 of 4
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.