제론 주식회사
US ˙ NasdaqGS ˙ US3741631036

SecurityGERN / Geron Corporation
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership555,701 shares
Latest Disclosed Value $ 733,525
Alliancebernstein L.p. reports 43.84% increase in ownership of GERN / Geron Corporation

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 555,701 shares of Geron Corporation (US:GERN) valued at $827,994 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 386,341 shares of Geron Corporation. This represents a change in shares of 43.84% during the quarter. The current value of the position is $672,398 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 GERON COM 374163103 555,701 169,360 43.84 734 44.01 0.0002
2026-02-17 2025-12-31 13F GERON COM 374163103 386,341 -238,950 -38.21 510 -40.54 0.0002
2025-11-14 2025-09-30 13F GERON COM 374163103 625,291 0 0.00 857 -2.84 0.0003
2025-08-14 2025-06-30 13F GERON COM 374163103 625,291 0 0.00 882 -11.37 0.0003
2025-05-15 2025-03-31 13F GERON COM 374163103 625,291 0 0.00 994 -55.08 0.0004
2025-02-12 2024-12-31 13F GERON COM 374163103 625,291 -604,491 -49.15 2,214 -60.36 0.0008
2024-11-14 2024-09-30 13F GERON COM 374163103 1,229,782 630,491 105.21 5,583 119.80 0.0019
2024-08-14 2024-06-30 13F GERON COM 374163103 599,291 86,550 16.88 2,541 50.12 0.0009
2024-05-14 2024-03-31 13F GERON COM 374163103 512,741 0 0.00 1,692 56.52 0.0006
2024-02-14 2023-12-31 13F GERON COM 374163103 512,741 0 0.00 1,082 -0.55 0.0004
2023-11-14 2023-09-30 13F GERON COM 374163103 512,741 0 0.00 1,087 -33.92 0.0005
2023-08-15 2023-06-30 13F GERON COM 374163103 512,741 151,930 42.11 1,646 110.36 0.0007
2023-05-15 2023-03-31 13F GERON COM 374163103 360,811 17,300 5.04 783 -5.90 0.0003
2023-02-15 2022-12-31 13F GERON COM 374163103 343,511 -152,800 -30.79 831 -28.42 0.0004
2022-11-15 2022-09-30 13F GERON COM 374163103 496,311 -142,400 -22.29 1,161 17.27 0.0006
2022-08-15 2022-06-30 13F GERON COM 374163103 638,711 0 0.00 990 13.92 0.0005
2022-05-13 2022-03-31 13F GERON COM 374163103 638,711 -15,400 -2.35 869 8.90 0.0003
2022-02-14 2021-12-31 13F GERON COM 374163103 654,111 0 0.00 798 -10.94 0.0003
2021-11-10 2021-09-30 13F GERON COM 374163103 654,111 -18,100 -2.69 896 -5.49 0.0004
2021-07-30 2021-06-30 13F GERON COM 374163103 672,211 459,200 215.58 948 181.31 0.0004
2021-05-06 2021-03-31 13F GERON COM 374163103 213,011 0 0.00 337 -0.59 0.0001
2021-02-08 2020-12-31 13F GERON COM 374163103 213,011 2,500 1.19 339 -7.38 0.0002
2020-11-12 2020-09-30 13F GERON COM 374163103 210,511 -61,700 -22.67 366 -38.28 0.0002
2020-08-13 2020-06-30 13F GERON COM 374163103 272,211 42,300 18.40 593 116.42 0.0003
2020-05-14 2020-03-31 13F GERON COM 374163103 229,911 41,200 21.83 274 6.61 0.0002
2020-02-18 2019-12-31 13F GERON COM 374163103 188,711 0 0.00 257 2.39 0.0001
2019-11-14 2019-09-30 13F GERON COM 374163103 188,711 -32,900 -14.85 251 -19.55 0.0002
2019-08-14 2019-06-30 13F GERON COM 374163103 221,611 7,600 3.55 312 -12.11 0.0002
2019-05-14 2019-03-31 13F GERON COM 374163103 214,011 -52,600 -19.73 355 32.96 0.0002
2019-02-13 2018-12-31 13F GERON COM 374163103 266,611 39,700 17.50 267 -33.08 0.0002
2018-11-08 2018-09-30 13F GERON COM 374163103 226,911 0 0.00 399 -48.71 0.0003
2018-08-13 2018-06-30 13F GERON COM 374163103 226,911 12,500 5.83 778 -14.60 0.0005
2018-05-14 2018-03-31 13F GERON COM 374163103 214,411 34,100 18.91 911 180.31 0.0007
2018-02-13 2017-12-31 13F GERON COM 374163103 180,311 -15,600 -7.96 325 -23.89 0.0002
2017-11-13 2017-09-30 13F GERON COM 374163103 195,911 0 0.00 427 -21.36 0.0003
2017-08-10 2017-06-30 13F GERON COM 374163103 195,911 12,600 6.87 543 30.53 0.0004
2017-05-11 2017-03-31 13F GERON COM 374163103 183,311 -12,900 -6.57 416 2.46 0.0003
2017-02-13 2016-12-31 13F GERON COM 374163103 196,211 0 0.00 406 -8.35 0.0003
2016-11-10 2016-09-30 13F GERON COM 374163103 196,211 0 0.00 443 -15.78 0.0004
2016-08-11 2016-06-30 13F GERON COM 374163103 196,211 0 0.00 526 -8.20 0.0005
2016-05-13 2016-03-31 13F GERON COM 374163103 196,211 0 0.00 573 -39.68 0.0005
2016-02-16 2015-12-31 13F/A-1 GERON COM 374163103 196,211 0 0.00 950 75.28 0.0008
2016-02-12 2015-12-31 13F GERON COM 374163103 196,211 542
2015-11-13 2015-09-30 13F GERON COM 374163103 196,211 0 0.00 542 -35.48 0.0005
2015-08-14 2015-06-30 13F GERON COM 374163103 196,211 0 0.00 840 13.51 0.0007
2015-05-13 2015-03-31 13F GERON COM 374163103 196,211 0 0.00 740 15.99 0.0006
2015-02-13 2014-12-31 13F GERON COM 374163103 196,211 121,100 161.23 638 325.33 0.0005
2014-11-13 2014-09-30 13F GERON COM 374163103 75,111 0 0.00 150 -37.76 0.0001
2014-08-13 2014-06-30 13F GERON COM 374163103 75,111 -118,845 -61.27 241 -40.20 0.0002
2014-05-13 2014-03-31 13F GERON COM 374163103 193,956 -72 -0.04 403 -56.20 0.0003
2014-02-13 2013-12-31 13F GERON COM 374163103 194,028 73,773 61.35 920 128.29 0.0008
2013-11-14 2013-09-30 13F GERON COM 374163103 120,255 -19,754 -14.11 403 91.90 0.0004
2013-08-13 2013-06-30 13F GERON COM 374163103 140,009 140,009 210 0.0002
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.