This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/GATX/capital-change-brief"
Use Arkolith's capital_change_brief for GATX. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | STATE FARM MUTUAL AUTOMOBILE INSURANCE CO | $926.7M | 5.4M | —Held | Q1 2026 | |
| 2 | BlackRock, Inc. | $767.2M | 4.5M | ▲+3.1% Added · +137K sh | Q1 2026 | |
| 3 | EARNEST PARTNERS LLC | $446.5M | 2.6M | ▼−3.2% Reduced · −88K sh | Q1 2026 | |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | $344.1M | 2.0M | ▲New +2.0M sh | Q1 2026 | |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $269.7M | 1.6M | ▲New +1.6M sh | Q1 2026 | |
| 6 | DIMENSIONAL FUND ADVISORS LP | $251.1M | 1.5M | ▼−0.8% Reduced · −11K sh | Q1 2026 | |
| 7 | STATE STREET CORP | $225.4M | 1.3M | ▲+2.7% Added · +35K sh | Q1 2026 | |
| 8 | AMERICAN CENTURY COMPANIES INC | $215.4M | 1.3M | ▼−1.3% Reduced · −17K sh | Q1 2026 | |
| 9 | GAMCO INVESTORS, INC. ET AL | $188.0M | 1.1M | ▼−8.1% Reduced · −97K sh | Q1 2026 | |
| 10 | BANK OF AMERICA CORP /DE/ | $171.7M | 1.0M | ▲+0.8% Added · +8K sh | Q1 2026 | |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | $156.3M | 915K | ▲+3.4% Added · +30K sh | Q1 2026 | |
| 12 | GABELLI FUNDS LLC | $144.4M | 845K | ▼−7.5% Reduced · −68K sh | Q1 2026 | |
| 13 | SEI INVESTMENTS CO | $130.5M | 764K | ▼−0.7% Reduced · −5K sh | Q1 2026 | |
| 14 | VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. | $113.9M | 643K | ▲+7.6% Added · +45K sh | Q2 2026 | |
| 15 | NORTHERN TRUST CORP | $104.0M | 609K | ▲+1.7% Added · +10K sh | Q1 2026 | |
| 16 | ALLIANCEBERNSTEIN L.P. | $98.4M | 580K | ▼−5.2% Reduced · −32K sh | Q1 2026 | |
| 17 | FMR LLC | $93.5M | 548K | ▲+60% Added · +206K sh | Q1 2026 | |
| 18 | NORGES BANK | $86.2M | 508K | ▲+33% Added · +127K sh | Q4 2025 | |
| 19 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $72.5M | 425K | ▼−0.9% Reduced · −4K sh | Q1 2026 | |
| 20 | MORGAN STANLEY | $53.9M | 316K | ▲+2.9% Added · +9K sh | Q1 2026 | |
| 21 | Ensign Peak Advisors, Inc | $53.3M | 312K | ▼−22% Reduced · −89K sh | Q1 2026 | |
| 22 | Bank of New York Mellon Corp | $50.9M | 298K | ▼−1.1% Reduced · −3K sh | Q1 2026 | |
| 23 | VANGUARD FIDUCIARY TRUST CO | $39.7M | 233K | ▲New +233K sh | Q1 2026 | |
| 24 | AMERIPRISE FINANCIAL INC | $38.1M | 223K | ▼−1.5% Reduced · −3K sh | Q1 2026 | |
| 25 | GOLDMAN SACHS GROUP INC | $35.3M | 207K | ▼−17% Reduced · −43K sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| May 1, 2026 | Arvia Anne L | Director | Grant (A) | 124 | $24K |
| May 1, 2026 | Aigotti Diane | Director | Grant (A) | 71 | $14K |
| May 1, 2026 | Bausch Shelley J | Director | Grant (A) | 128 | $25K |
| May 1, 2026 | YOVOVICH PAUL G | Director | Grant (A) | 136 | $27K |
| May 1, 2026 | REAM JAMES B | Director | Grant (A) | 169 | $33K |
| May 1, 2026 | Holmes John McClain III | Director | Grant (A) | 129 | $25K |
| May 1, 2026 | WETHERBEE ROBERT S | Director | Grant (A) | 115 | $22K |
| May 1, 2026 | Stanley Adam L. | Director | Grant (A) | 30 | $6K |
| Apr 24, 2026 | Arvia Anne L | Director | Grant (A) | 731 | $0 |
| Apr 24, 2026 | Bausch Shelley J | Director | Grant (A) | 731 | $0 |
| Apr 24, 2026 | Aigotti Diane | Director | Grant (A) | 731 | $0 |
| Apr 24, 2026 | REAM JAMES B | Director | Grant (A) | 731 | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 129 funds | $48.8B |
| ELI LILLY & COLLY | 129 funds | $14.2B |
| BROADCOM INCAVGO | 128 funds | $24.4B |
| NVIDIA CORPNVDA | 127 funds | $65.4B |
| AMAZON.COM INCAMZN | 127 funds | $35.4B |
| JPMORGAN CHASE & COJPM | 127 funds | $16.9B |
| META PLATFORMS INC-CLASS AMETA | 126 funds | $20.6B |
| COSTCO WHOLESALE CORPCOST | 126 funds | $9.0B |
| MASTERCARD INC - AMA | 126 funds | $8.7B |
| CHEVRON CORPCVX | 126 funds | $8.3B |
| APPLE INCAAPL | 125 funds | $59.5B |
| ALPHABET INC-CL AGOOGL | 125 funds | $31.8B |
Ranked by how many of GATX's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for GATX. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes. Every panel above is one call to the Arkolith API & MCP server.