Rivian Automotive, Inc.
MX ˙ BMV ˙ US76954A1034
SecurityMX:RIVN / Rivian Automotive, Inc.
InstitutionQuadrature Capital Ltd
Latest Disclosed Ownership257,662 shares
Latest Disclosed Value $ 3,877,813
Quadrature Capital Ltd reports 2.97% increase in ownership of RIVN / Rivian Automotive, Inc.

On May 15, 2026 - Quadrature Capital Ltd filed a 13F-HR form disclosing ownership of 257,662 shares of Rivian Automotive, Inc. (MX:RIVN) valued at $3,877,813 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 250,224 shares of Rivian Automotive, Inc.. This represents a change in shares of 2.97% 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)
2026-05-15 2026-03-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 257,662 7,438 2.97 3,878 -21.37 0.0461
2026-02-17 2025-12-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 250,224 -436,197 -63.55 4,932 -51.03 0.0503
2025-11-13 2025-09-30 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 686,421 686,421 10,070 0.1191
2025-08-13 2025-06-30 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 0 -103,963 -100.00 0 -100.00
2025-05-13 2025-03-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 103,963 -195,879 -65.33 1,294 -67.57 0.0287
2025-02-13 2024-12-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 299,842 -510,718 -63.01 3,991 -79.03 0.0800
2024-02-13 2023-12-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 810,560 810,560 19,024 0.3563
2023-08-14 2023-06-30 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 0 -128,085 -100.00 0 -100.00
2023-05-15 2023-03-31 13F RIVIAN AUTOMOTIVE COM CL A 76954A103 128,085 128,085 1,981 0.0578
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.