IDEAYA 바이오사이언스, Inc.
US ˙ NasdaqGS ˙ US45166A1025

SecurityIDYA / IDEAYA Biosciences, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership1,860,453 shares
Latest Disclosed Value $ 61,990,332
Morgan Stanley reports 48.55% increase in ownership of IDYA / IDEAYA Biosciences, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 1,860,453 shares of IDEAYA Biosciences, Inc. (US:IDYA) valued at $61,990,294 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,252,404 shares of IDEAYA Biosciences, Inc.. This represents a change in shares of 48.55% during the quarter. The current value of the position is $52,632,215 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)
2026-05-15 2026-03-31 13F IDEAYA BIOSCIENCES COM 45166A102 1,860,453 608,049 48.55 61,990 43.18 0.0037
2026-05-27 2025-12-31 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 1,252,404 -327,949 -20.75 43,296 0.68 0.0003
2026-02-13 2025-12-31 13F IDEAYA BIOSCIENCES COM 45166A102 1,252,404 -327,949 43,296 0.0026
2026-05-27 2025-09-30 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 1,580,353 126,976 8.74 43,001 40.76 0.0026
2025-11-14 2025-09-30 13F IDEAYA BIOSCIENCES COM 45166A102 1,580,353 126,976 43,001 0.0026
2025-08-15 2025-06-30 13F IDEAYA BIOSCIENCES COM 45166A102 1,453,377 -233,211 -13.83 30,550 10.58 0.0020
2025-05-15 2025-03-31 13F IDEAYA BIOSCIENCES COM 45166A102 1,686,588 131,508 8.46 27,626 -30.87 0.0020
2025-05-15 2024-12-31 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 1,555,080 1,194,443 331.20 39,966 249.83 0.0028
2025-02-14 2024-12-31 13F IDEAYA BIOSCIENCES COM 45166A102 1,555,080 1,194,443 39,966 0.0028
2025-05-14 2024-09-30 13F/A-2 IDEAYA BIOSCIENCES COM 45166A102 360,637 -423,488 -54.01 11,425 -58.50 0.0008
2025-02-14 2024-09-30 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 360,637 -423,488 11,425 0.0008
2024-11-14 2024-09-30 13F IDEAYA BIOSCIENCES COM 45166A102 360,637 -423,488 11,425 0.0008
2025-05-14 2024-06-30 13F/A-2 IDEAYA BIOSCIENCES COM 45166A102 784,125 20,507 2.69 27,531 -17.84 0.0021
2024-10-17 2024-06-30 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 784,125 20,507 27,531 0.0021
2024-08-14 2024-06-30 13F IDEAYA BIOSCIENCES COM 45166A102 784,125 20,507 27,531 0.0021
2024-10-17 2024-03-31 13F/A-2 IDEAYA BIOSCIENCES COM 45166A102 763,618 -469,653 -38.08 33,508 -23.64 0.0027
2024-08-16 2024-03-31 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 763,618 -469,653 33,508 0.0027
2024-05-15 2024-03-31 13F IDEAYA BIOSCIENCES COM 45166A102 763,618 -469,653 33,508 0.0027
2024-08-16 2023-12-31 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 1,233,271 1,000,495 429.81 43,880 598.71 0.0039
2024-02-13 2023-12-31 13F IDEAYA BIOSCIENCES COM 45166A102 1,233,271 1,000,495 43,880 0.0039
2023-11-15 2023-09-30 13F IDEAYA BIOSCIENCES COM 45166A102 232,776 -119,790 -33.98 6,280 -24.20 0.0006
2023-08-14 2023-06-30 13F IDEAYA BIOSCIENCES COM 45166A102 352,566 261,814 288.49 8,285 564.93 0.0008
2023-05-15 2023-03-31 13F IDEAYA BIOSCIENCES COM 45166A102 90,752 32,635 56.15 1,246 18.10 0.0001
2023-02-14 2022-12-31 13F IDEAYA BIOSCIENCES COM 45166A102 58,117 9,085 18.53 1,056 44.13 0.0001
2022-11-14 2022-09-30 13F IDEAYA BIOSCIENCES COM 45166A102 49,032 -37,023 -43.02 732 -38.28 0.0001
2022-10-27 2022-06-30 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 86,055 -34,784 -28.79 1,186 -12.28 0.0002
2022-08-15 2022-06-30 13F IDEAYA BIOSCIENCES COM 45166A102 86,055 -34,784 1,186 0.0002
2022-10-27 2022-03-31 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 120,839 81,646 208.32 1,352 46.00 0.0002
2022-05-13 2022-03-31 13F IDEAYA BIOSCIENCES COM 45166A102 120,839 81,646 1,352 0.0002
2022-02-14 2021-12-31 13F IDEAYA BIOSCIENCES COM 45166A102 39,193 11,810 43.13 926 32.66 0.0001
2021-11-15 2021-09-30 13F IDEAYA BIOSCIENCES COM 45166A102 27,383 15,825 136.92 698 187.24 0.0001
2021-08-23 2021-06-30 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 11,558 11,327 4,903.46 243 3,950.00 0.0000
2021-08-16 2021-06-30 13F IDEAYA BIOSCIENCES COM 45166A102 11,558 11,327 243 0.0000
2021-05-17 2021-03-31 13F IDEAYA BIOSCIENCES COM 45166A102 231 -11,719 -98.07 6 -96.41 0.0000
2021-02-16 2020-12-31 13F IDEAYA BIOSCIENCES COM 45166A102 11,950 7,341 159.28 167 187.93 0.0000
2020-11-13 2020-09-30 13F IDEAYA BIOSCIENCES COM 45166A102 4,609 -2,107 -31.37 58 -39.58 0.0000
2020-08-14 2020-06-30 13F IDEAYA BIOSCIENCES COM 45166A102 6,716 6,192 1,181.68 96 4,700.00 0.0000
2020-05-26 2020-03-31 13F/A-1 IDEAYA BIOSCIENCES COM 45166A102 524 -376 -41.78 2 -71.43 0.0000
2020-05-15 2020-03-31 13F IDEAYA BIOSCIENCES COM 45166A102 524 -376 2 0.1536
2020-02-14 2019-12-31 13F IDEAYA BIOSCIENCES COM 45166A102 900 900 7 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.