Alto Neuroscience, Inc.
US ˙ NYSE

SecurityANRO / Alto Neuroscience, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership473,403 shares
Latest Disclosed Value $ 10,642,099
Northern Trust Corp reports 0.20% decrease in ownership of ANRO / Alto Neuroscience, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 473,403 shares of Alto Neuroscience, Inc. (US:ANRO) valued at $10,642,099 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 474,373 shares of Alto Neuroscience, Inc.. This represents a change in shares of -0.20% during the quarter. The current value of the position is $8,644,339 USD.

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)
2026-05-14 2026-03-31 13F ALTO NEUROSCIENCE COM SHS 02157Q109 473,403 -970 -0.20 10,642 26.05 0.0003
2026-02-17 2025-12-31 13F ALTO NEUROSCIENCE COM SHS 02157Q109 474,373 13,088 2.84 8,444 355.39 0.0002
2025-11-14 2025-09-30 13F ALTO NEUROSCIENCE COM SHS 02157Q109 461,285 -2,059 -0.44 1,854 81.94 0.0001
2025-08-13 2025-06-30 13F ALTO NEUROSCIENCE COM SHS 02157Q109 463,344 -125,935 -21.37 1,019 -19.89 0.0001
2025-05-13 2025-03-31 13F ALTO NEUROSCIENCE COM SHS 02157Q109 589,279 2,144 0.37 1,273 -48.77 0.0002
2025-02-14 2024-12-31 13F ALTO NEUROSCIENCE COM SHS 02157Q109 587,135 390,190 198.12 2,484 10.21 0.0004
2024-11-13 2024-09-30 13F ALTO NEUROSCIENCE COM 02157Q109 196,945 175,911 836.32 2,253 905.80 0.0004
2024-08-14 2024-06-30 13F ALTO NEUROSCIENCE COM 02157Q109 21,034 4,647 28.36 225 -10.76 0.0000
2024-05-14 2024-03-31 13F ALTO NEUROSCIENCE COM 02157Q109 16,387 16,387 252 0.0000
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.