Stephen Mandel

Summary

Stephen Mandel disclosed 34 positions in its latest 13F (2026 Q2), a portfolio value of ~$16.36B, across 7 sectors; top holdings NBIS, ASML, STX. This quarter: 13 new, 8 added, 13 trimmed, 15 closed. Data from public SEC 13F filings, delayed up to ~45 days.

Portfolio value$16.36B

Holdings34incl. options

Sectors7

Latest filing2026 Q2

New13$6.61B

Added8$1.35B

Trimmed13$2.74B

Sold15$3.72B

View original SEC filing

Guru playbook

This quarter at a glance

Balanced bookDiversifiedHigh turnover · active

Circle of competence (by value)

Technology21%

Consumer Discretionary6%

Materials5%

Biggest new buy

NBISNEBIUS GROUP N.V.

New buy · of book 7.2%

Biggest add

MDLNMEDLINE INC-CL A

Added +77.9%

Biggest exit

VSTVISTRA CORP

Exited · was ~$930.18M

⚠️ Tags are auto-derived from public 13F holdings.

Position-weight treemap

By share of portfolio value (2026 Q2, common stock only, top 25).

Sector breakdown

By value (positions with no sector fall under “Uncategorized”).

Public SEC 13F filings may appear up to 45 days after quarter-end; STOCK Act / OGE trade filings are generally due within 45 days but may be late. Partial data only — research, not investment advice.