Rivian Automotive, Inc.
MX ˙ BMV ˙ US76954A1034
SecurityMX:RIVN / Rivian Automotive, Inc.
InstitutionTriumph Capital Management
Latest Disclosed Ownership113,727 shares
Latest Disclosed Value $ 1,711,591
Triumph Capital Management reports 18.03% increase in ownership of RIVN / Rivian Automotive, Inc.

On May 13, 2026 - Triumph Capital Management filed a 13F-HR form disclosing ownership of 113,727 shares of Rivian Automotive, Inc. (MX:RIVN) valued at $1,711,591 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 96,358 shares of Rivian Automotive, Inc.. This represents a change in shares of 18.03% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 113,727 17,369 18.03 1,712 -9.90 0.3484
2026-02-12 2025-12-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 96,358 -9,768 -9.20 1,899 21.97 0.4103
2025-12-23 2025-09-30 13F/A-1 RIVIAN AUTOMOTIVE COM CL A 76954A103 106,126 36,806 53.10 1,558 63.55 0.4178
2025-11-17 2025-09-30 13F RIVIAN AUTOMOTIVE INC COM CL A Stock 76954A103 106,126 36,806 1,558 0.3724
2025-12-29 2025-06-30 13F/A-1 RIVIAN AUTOMOTIVE COM CL A 76954A103 69,320 -9,224 -11.74 952 -2.56 0.2859
2025-07-09 2025-06-30 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 69,320 -9,224 952 0.2859
2025-05-06 2025-03-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 78,544 20,860 36.16 978 27.38 0.3257
2025-02-14 2024-12-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 57,684 20,651 55.76 767 84.82 0.2626
2025-02-14 2024-09-30 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 37,033 37,033 416 0.1481
2023-10-31 2023-09-30 13F RIVIAN AUTOMOTIVE INC COM CL A COM 76954A103 0 -11,609 -100.00 0 -100.00
2023-08-03 2023-06-30 13F RIVIAN AUTOMOTIVE INC COM CL A COM 76954A103 11,609 11,609 193 0.0877
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.