AnaptysBio, Inc.
MX ˙ BMV ˙ US0327241065
SecurityMX:ANAB / AnaptysBio, Inc.
InstitutionBlackRock, Inc.
Latest Disclosed Ownership1,900,844 shares
Ownership 6.20%
BlackRock, Inc. ownership in ANAB / AnaptysBio, Inc.

2025-04-17 - BlackRock, Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 1,900,844 shares of AnaptysBio, Inc. (MX:ANAB). This represents 6.2 percent ownership of the company. In their previous filing dated 2025-02-05 , BlackRock, Inc. had reported owning 2,548,468 shares, indicating a decrease of -25.41 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2025-04-17 2025-04-17 13G/A 2,548,468 1,900,844 -25.41 6.20 -26.19
2025-02-05 2025-02-05 13G/A 1,799,823 2,548,468 41.60 8.40 23.53
2024-01-26 2024-01-26 13G/A 1,856,266 1,799,823 -3.04 6.80 4.62
2023-02-01 2023-02-01 13G/A 1,865,288 1,856,266 -0.48 6.50 -4.41
2022-02-03 2022-02-03 13G/A 1,907,834 1,865,288 -2.23 6.80 -2.86
2021-01-29 2021-01-29 13G/A 2,048,614 1,907,834 -6.87 7.00 -7.89
2021-01-29 2021-01-29 13G/A 1,907,834 1,907,834 0.00 7.00 0.00
2020-02-05 2020-02-05 13G/A 1,816,825 2,048,614 12.76 7.60 11.76
2019-02-04 2019-02-04 13G/A 1,393,305 1,816,825 30.40 6.80 15.25
2018-02-01 2018-02-01 13G 1,393,305 5.90

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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 ANAPTYSBIO COM 032724106 1,681,380 -53,050 -3.06 93,249 10.90 0.0001
2026-02-12 2025-12-31 13F ANAPTYSBIO COM 032724106 1,734,430 12,106 0.70 84,085 59.44 0.0014
2025-11-12 2025-09-30 13F ANAPTYSBIO COM 032724106 1,722,324 -64,610 -3.62 52,738 32.94 0.0009
2025-08-12 2025-06-30 13F ANAPTYSBIO COM 032724106 1,786,934 -389,664 -17.90 39,670 -1.96 0.0008
2025-05-02 2025-03-31 13F ANAPTYSBIO COM 032724106 2,176,598 -371,870 -14.59 40,463 19.92 0.0008
2025-02-07 2024-12-31 13F ANAPTYSBIO COM 032724106 2,548,468 368,279 16.89 33,742 -53.80 0.0007
2024-11-13 2024-09-30 13F ANAPTYSBIO COM 032724106 2,180,189 410,245 23.18 73,036 64.67 0.0015
2024-08-13 2024-06-30 13F ANAPTYSBIO COM 032724106 1,769,944 49,893 2.90 44,355 14.51 0.0010
2024-05-10 2024-03-31 13F ANAPTYSBIO COM 032724106 1,720,051 -79,772 -4.43 38,736 0.47 0.0009
2024-02-13 2023-12-31 13F ANAPTYSBIO COM 032724106 1,799,823 -24,069 -1.32 38,552 17.69 0.0010
2023-11-13 2023-09-30 13F ANAPTYSBIO COM 032724106 1,823,892 -813 -0.04 32,757 -11.74 0.0009
2023-08-11 2023-06-30 13F ANAPTYSBIO COM 032724106 1,824,705 -70,789 -3.73 37,115 -10.02 0.0010
2023-05-12 2023-03-31 13F ANAPTYSBIO COM 032724106 1,895,494 39,228 2.11 41,246 -28.30 0.0012
2023-02-13 2022-12-31 13F ANAPTYSBIO COM 032724106 1,856,266 88,469 5.00 57,526 27.56 0.0018
2022-11-14 2022-09-30 13F ANAPTYSBIO COM 032724106 1,767,797 -6,101 -0.34 45,096 25.24 0.0015
2022-08-12 2022-06-30 13F ANAPTYSBIO COM 032724106 1,773,898 -49,497 -2.71 36,009 -20.18 0.0012
2022-05-12 2022-03-31 13F ANAPTYSBIO COM 032724106 1,823,395 -41,893 -2.25 45,110 -30.41 0.0012
2022-02-10 2021-12-31 13F ANAPTYSBIO COM 032724106 1,865,288 -5,889 -0.31 64,819 27.73 0.0017
2021-11-09 2021-09-30 13F ANAPTYSBIO COM 032724106 1,871,177 19,273 1.04 50,746 5.68 0.0014
2021-08-11 2021-06-30 13F ANAPTYSBIO COM 032724106 1,851,904 -244,234 -11.65 48,020 6.31 0.0013
2021-05-07 2021-03-31 13F ANAPTYSBIO COM 032724106 2,096,138 188,304 9.87 45,171 10.13 0.0013
2021-02-05 2020-12-31 13F ANAPTYSBIO COM 032724106 1,907,834 -22,586 -1.17 41,017 44.06 0.0013
2020-11-06 2020-09-30 13F ANAPTYSBIO COM 032724106 1,930,420 -157,644 -7.55 28,473 -38.96 0.0011
2020-08-14 2020-06-30 13F ANAPTYSBIO COM 032724106 2,088,064 57,394 2.83 46,647 62.57 0.0019
2020-05-01 2020-03-31 13F ANAPTYSBIO COM 032724106 2,030,670 -17,944 -0.88 28,694 -13.80 0.0014
2020-02-13 2019-12-31 13F ANAPTYSBIO COM 032724106 2,048,614 -38,949 -1.87 33,289 -54.43 0.0013
2019-11-08 2019-09-30 13F ANAPTYSBIO COM 032724106 2,087,563 37,173 1.81 73,045 -36.86 0.0031
2019-08-22 2019-06-30 13F/A-1 ANAPTYSBIO COM 032724106 2,050,390 242,187 13.39 115,681 -12.42 0.0049
2019-08-13 2019-06-30 13F ANAPTYSBIO COM 032724106 2,050,390 242,187 115,681
2019-05-09 2019-03-31 13F ANAPTYSBIO COM 032724106 1,808,203 -8,622 -0.47 132,089 13.97 0.0059
2019-02-08 2018-12-31 13F ANAPTYSBIO COM 032724106 1,816,825 189,685 11.66 115,894 -28.61 0.0059
2018-11-09 2018-09-30 13F ANAPTYSBIO COM 032724106 1,627,140 162,516 11.10 162,341 56.03 0.0070
2018-08-09 2018-06-30 13F ANAPTYSBIO COM 032724106 1,464,624 41,507 2.92 104,046 -29.76 0.0048
2018-05-09 2018-03-31 13F ANAPTYSBIO COM 032724106 1,423,117 29,812 2.14 148,119 5.55 0.0071
2018-02-09 2017-12-31 13F ANAPTYSBIO COM 032724106 1,393,305 710,574 104.08 140,334 488.13 0.0067
2017-11-14 2017-09-30 13F ANAPTYSBIO COM 032724106 682,731 380,575 125.95 23,861 229.98 0.0012
2017-08-10 2017-06-30 13F ANAPTYSBIO COM 032724106 302,156 53,937 21.73 7,231 4.98 0.0004
2017-05-12 2017-03-31 13F ANAPTYSBIO COM 032724106 248,219 248,219 6,888 0.0004
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.