Pacific Biosciences of California, Inc.
US ˙ NasdaqGS ˙ US69404D1081

SecurityPACB / Pacific Biosciences of California, Inc.
InstitutionBlackRock, Inc.
Latest Disclosed Ownership22,865,948 shares
Ownership 7.70%
BlackRock, Inc. ownership in PACB / Pacific Biosciences of California, Inc.

2025-04-17 - BlackRock, Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 22,865,948 shares of Pacific Biosciences of California, Inc. (US:PACB). This represents 7.7 percent ownership of the company. In their previous filing dated 2024-01-24 , BlackRock, Inc. had reported owning 24,642,666 shares, indicating a decrease of -7.21 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 24,642,666 22,865,948 -7.21 7.70 -16.30
2024-01-24 2024-01-24 13G/A 18,534,459 24,642,666 32.96 9.20 12.20
2023-02-03 2023-02-03 13G/A 16,569,244 18,534,459 11.86 8.20 9.33
2022-02-03 2022-02-03 13G/A 15,115,490 16,569,244 9.62 7.50 -7.41
2021-01-29 2021-01-29 13G/A 12,033,320 15,115,490 25.61 8.10 2.53
2020-02-10 2020-02-10 13G/A 11,256,330 12,033,320 6.90 7.90 3.95
2019-02-11 2019-02-11 13G/A 8,155,624 11,256,330 38.02 7.60 8.57
2018-01-29 2018-01-29 13G/A 8,499,826 8,155,624 -4.05 7.00 -23.91
2017-01-25 2017-01-25 13G/A 6,259,216 8,499,826 35.80 9.20 13.58
2016-01-27 2016-01-27 13G/A 6,259,216 8.10
2015-01-09 2015-01-09 13G/A 7,382,305 10.30
2014-01-10 2014-01-10 13G 6,821,277 10.30

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 PACIFIC BIOSCIENCES CALIF IN COM 69404D108 25,267,429 1,922,459 8.24 33,353 -23.60 0.0006
2026-02-12 2025-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 23,344,970 649,218 2.86 43,655 50.28 0.0007
2025-11-12 2025-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 22,695,752 42,878 0.19 29,051 3.42 0.0005
2025-08-12 2025-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 22,652,874 -802,378 -3.42 28,090 1.49 0.0005
2025-05-02 2025-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 23,455,252 -1,139,521 -4.63 27,677 -38.51 0.0006
2025-02-07 2024-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 24,594,773 1,342,091 5.77 45,008 13.86 0.0009
2024-11-13 2024-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 23,252,682 -356,006 -1.51 39,530 22.22 0.0008
2024-08-13 2024-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 23,608,688 213,704 0.91 32,344 -63.13 0.0007
2024-05-10 2024-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 23,394,984 -1,247,682 -5.06 87,731 -63.71 0.0020
2024-02-13 2023-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 24,642,666 1,966,160 8.67 241,745 27.67 0.0062
2023-11-13 2023-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 22,676,506 1,853,603 8.90 189,349 -31.63 0.0054
2023-08-11 2023-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 20,822,903 621,003 3.07 276,945 18.38 0.0076
2023-05-12 2023-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 20,201,900 1,666,520 8.99 233,938 54.29 0.0069
2023-02-13 2022-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 18,535,380 626,824 3.50 151,619 45.84 0.0048
2022-11-14 2022-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 17,908,556 -473,105 -2.57 103,959 27.96 0.0035
2022-08-12 2022-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 18,381,661 1,772,308 10.67 81,246 -46.25 0.0026
2022-05-12 2022-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 16,609,353 40,109 0.24 151,146 -55.42 0.0041
2022-02-10 2021-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 16,569,244 436,273 2.70 339,007 -17.76 0.0086
2021-11-09 2021-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 16,132,971 -56,461 -0.35 412,197 -27.19 0.0115
2021-08-11 2021-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 16,189,432 -303,683 -1.84 566,145 3.05 0.0158
2021-05-07 2021-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 16,493,115 1,377,625 9.11 549,386 40.12 0.0161
2021-02-05 2020-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 15,115,490 696,299 4.83 392,094 175.51 0.0125
2020-11-06 2020-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 14,419,191 1,075,613 8.06 142,316 209.14 0.0053
2020-08-14 2020-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 13,343,578 508,752 3.96 46,036 17.21 0.0018
2020-05-01 2020-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 12,834,826 801,506 6.66 39,275 -36.50 0.0019
2020-02-13 2019-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 12,033,320 189,902 1.60 61,851 1.21 0.0024
2019-11-08 2019-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 11,843,418 145,062 1.24 61,111 -13.66 0.0026
2019-08-22 2019-06-30 13F/A-1 PACIFIC BIOSCIENCES CALIF IN COM 69404D108 11,698,356 559,753 5.03 70,776 -12.11 0.0030
2019-08-13 2019-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 11,698,356 559,753 70,776
2019-05-09 2019-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 11,138,603 -117,727 -1.05 80,531 -3.32 0.0036
2019-02-08 2018-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 11,256,330 1,283,490 12.87 83,298 54.39 0.0042
2018-11-09 2018-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 9,972,840 330,666 3.43 53,953 57.62 0.0023
2018-08-09 2018-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 9,642,174 849,435 9.66 34,230 89.92 0.0016
2018-05-09 2018-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 8,792,739 637,115 7.81 18,023 -16.29 0.0009
2018-02-09 2017-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 8,155,624 -1,219,392 -13.01 21,531 -56.25 0.0010
2017-11-14 2017-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 9,375,016 1,715,524 22.40 49,219 80.50 0.0025
2017-08-10 2017-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 7,659,492 -345,980 -4.32 27,268 -34.11 0.0014
2017-05-12 2017-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 8,005,472 7,859,853 5,397.55 41,387 7,384.09 0.0023
2017-02-10 2016-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 145,619 -793 -0.54 553 -57.85 0.0008
2016-11-08 2016-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 146,412 11,910 8.85 1,312 38.69 0.0019
2016-08-10 2016-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 134,502 -27,540 -17.00 946 -31.35 0.0014
2016-05-10 2016-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 162,042 16,693 11.48 1,378 -27.82 0.0022
2016-02-11 2015-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 145,349 -12,038 -7.65 1,909 231.42 0.0028
2015-11-13 2015-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 157,387 72,966 86.43 576 18.52 0.0009
2015-08-07 2015-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 84,421 83,000 5,840.96 486 5,975.00 0.0007
2015-05-13 2015-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 1,421 0 0.00 8 -27.27 0.0000
2015-02-09 2014-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 1,421 0 0.00 11 57.14 0.0000
2014-10-29 2014-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 1,421 0 0.00 7 -22.22 0.0000
2014-08-06 2014-06-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 1,421 0 0.00 9 12.50 0.0000
2014-05-02 2014-03-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 1,421 293 25.98 8 33.33 0.0000
2014-02-12 2013-12-31 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 1,128 0 0.00 6 0.00 0.0000
2013-11-12 2013-09-30 13F PACIFIC BIOSCIENCES CALIF IN COM 69404D108 1,128 1,128 6 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.