Greenbrier Companies (GBX) Held by Superinvestors
GREENBRIER COMPANIES INC (GBX) is currently held by 3 superinvestors tracked by InsiderSet, with a combined reported market value of approximately $39.68M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Donald Smith & Co. is currently the largest disclosed institutional shareholder of GBX tracked by InsiderSet, reporting ownership valued at approximately $31.99M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $24.86M, representing an estimated loss of -22.28% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 100% of the total disclosed GBX value among the investors covered in this analysis. Major shareholders include Donald Smith & Co., Renaissance Technologies LLC, Cullen Value Fund, and several other long-term asset managers with concentrated positions in GREENBRIER COMPANIES INC (GBX).
This page ranks the largest institutional GBX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Donald Smith & Co. | Donald G. Smith | 0.57% | 652,672 | $31,987,455 | $24,860,276 | -$7,127,179 | -22.28% |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 142,800 | $6,998,628 | $5,439,252 | -$1,559,376 | -22.28% |
| Cullen Value Fund | Jim Cullen | 0.08% | 17,669 | $692,092 | $673,012 | -$19,080 | -2.76% |
Frequently asked questions about GBX
Who are the largest superinvestors holding GBX?
The largest superinvestors holding GBX in the latest SEC Form 13F filings include Donald Smith & Co., Renaissance Technologies LLC, and Cullen Value Fund. InsiderSet ranks these superinvestors by their latest reported GBX position.
What does the GBX superinvestors page include?
This page tracks GBX positions reported by a curated group of notable institutional investors and fund managers through SEC Form 13F. GREENBRIER COMPANIES INC (GBX) on this page reflects disclosed 13F holdings among those superinvestors, not every institutional shareholder of the stock.
How many superinvestors hold GBX?
InsiderSet currently tracks 3 superinvestors reporting GBX holdings in the latest available 13F data. This is the curated set on this page, not the total number of institutions that own GBX.
How much GBX stock do superinvestors hold?
Superinvestors tracked by InsiderSet disclosed approximately $39.68M in GBX holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value, and it covers the curated superinvestors on this page rather than every institutional filer.
When were GBX superinvestor holdings last updated?
The latest GBX superinvestor holdings on InsiderSet are based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time holdings.
Are superinvestor GBX holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by these superinvestors as of the end of the reporting quarter. A superinvestor may have changed its GBX position after the reporting date.
Are superinvestors buying or selling GBX?
Buying and selling can be analyzed by comparing GBX positions across consecutive 13F reporting periods. InsiderSet's GBX Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View GBX ownership changes.
How have superinvestor GBX holdings changed over time?
InsiderSet tracks GBX holdings among these superinvestors across multiple 13F reporting periods, so holder counts, reported value, and reported shares can be compared over time.