Plug Power Inc.
MX ˙ BMV ˙ US72919P2020
SecurityMX:PLUG / Plug Power Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership1,880,835 shares
Latest Disclosed Value $ 4,250,676
Rhumbline Advisers reports 11.05% increase in ownership of PLUG / Plug Power Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 1,880,835 shares of Plug Power Inc. (MX:PLUG) valued at $4,250,676 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,693,644 shares of Plug Power Inc.. This represents a change in shares of 11.05% during the quarter.

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)
2026-05-12 2026-03-31 13F PLUG POWER INC COM COM 72919P202 1,880,835 187,191 11.05 4,251 27.40 0.0036
2026-02-13 2025-12-31 13F PLUG POWER INC COM COM 72919P202 1,693,644 -116,235 -6.42 3,336 -20.89 0.0027
2025-11-06 2025-09-30 13F PLUG POWER INC COM COM 72919P202 1,809,879 436,502 31.78 4,217 106.11 0.0034
2025-08-12 2025-06-30 13F PLUG POWER INC COM COM 72919P202 1,373,377 251,033 22.37 2,046 35.05 0.0018
2025-05-29 2025-03-31 13F/A-1 PLUG POWER INC COM COM 72919P202 1,122,344 -149,332 -11.74 1,515 -44.05 0.0014
2025-04-08 2025-03-31 13F PLUG POWER INC COM COM 72919P202 1,122,344 -149,332 1,515 0.0014
2025-05-29 2024-12-31 13F/A-1 PLUG POWER INC COM COM 72919P202 1,271,676 -229,812 -15.31 2,709 -20.19 0.0024
2025-01-30 2024-12-31 13F PLUG POWER INC COM COM 72919P202 1,271,676 -229,812 2,709 0.0024
2024-11-12 2024-09-30 13F PLUG POWER INC COM COM 72919P202 1,501,488 205,441 15.85 3,393 12.39 0.0031
2024-08-01 2024-06-30 13F PLUG POWER INC COM COM 72919P202 1,296,047 638,761 97.18 3,020 33.52 0.0028
2024-05-09 2024-03-31 13F PLUG POWER INC COM COM 72919P202 657,286 -151,493 -18.73 2,261 -37.87 0.0022
2024-02-08 2023-12-31 13F PLUG POWER INC COM COM 72919P202 808,779 57,933 7.72 3,639 -36.23 0.0038
2023-11-09 2023-09-30 13F PLUG POWER INC COM COM 72919P202 750,846 -65,903 -8.07 5,706 -32.76 0.0066
2023-08-08 2023-06-30 13F PLUG POWER INC COM COM 72919P202 816,749 224,962 38.01 8,486 141,333.33 0.0095
2023-05-11 2023-03-31 13F PLUG POWER INC COM COM 72919P202 591,787 8,886 1.52 7 -99.92 0.0086
2023-02-14 2022-12-31 13F PLUG POWER INC COM COM 72919P202 582,901 16,182 2.86 7,210 -39.45 0.0097
2022-11-10 2022-09-30 13F PLUG POWER INC COM COM 72919P202 566,719 45,488 8.73 11,907 37.86 0.0177
2022-08-11 2022-06-30 13F PLUG POWER INC COM COM 72919P202 521,231 30,485 6.21 8,637 -38.48 0.0126
2022-05-12 2022-03-31 13F PLUG POWER INC COM COM 72919P202 490,746 -19,875 -3.89 14,040 -2.60 0.0181
2022-02-10 2021-12-31 13F PLUG POWER INC COM COM 72919P202 510,621 13,389 2.69 14,415 13.51 0.0177
2021-11-12 2021-09-30 13F PLUG POWER INC COM COM 72919P202 497,232 -793 -0.16 12,699 -25.42 0.0172
2021-08-05 2021-06-30 13F PLUG POWER INC COM COM 72919P202 498,025 -5,630 -1.12 17,027 -5.67 0.0223
2021-05-06 2021-03-31 13F PLUG POWER INC COM COM 72919P202 503,655 28,789 6.06 18,051 12.10 0.0245
2021-02-10 2020-12-31 13F PLUG POWER INC COM COM 72919P202 474,866 61,035 14.75 16,103 190.20 0.0222
2020-11-12 2020-09-30 13F PLUG POWER INC COM COM 72919P202 413,831 -57,040 -12.11 5,549 43.53 0.0087
2020-08-13 2020-06-30 13F PLUG POWER INC COM COM 72919P202 470,871 104,628 28.57 3,866 198.07 0.0065
2020-05-06 2020-03-31 13F PLUG POWER INC COM COM 72919P202 366,243 63,314 20.90 1,297 35.53 0.0027
2020-02-05 2019-12-31 13F PLUG POWER INC COM COM 72919P202 302,929 5,034 1.69 957 22.22 0.0016
2019-10-23 2019-09-30 13F PLUG POWER INC COM COM 72919P202 297,895 -275 -0.09 783 16.69 0.0014
2019-08-14 2019-06-30 13F PLUG POWER INC COM COM 72919P202 298,170 17,576 6.26 671 -0.30 0.0013
2019-05-01 2019-03-31 13F PLUG POWER INC COM COM 72919P202 280,594 -3,614 -1.27 673 91.19 0.0013
2019-01-31 2018-12-31 13F PLUG POWER INC COM COM 72919P202 284,208 89,744 46.15 352 -5.63 0.0008
2018-11-07 2018-09-30 13F PLUG POWER INC COM COM 72919P202 194,464 -14,000 -6.72 373 -11.40 0.0007
2018-08-06 2018-06-30 13F PLUG POWER INC COM COM 72919P202 208,464 8,014 4.00 421 11.08 0.0008
2018-05-02 2018-03-31 13F PLUG POWER INC COM COM 72919P202 200,450 -4,670 -2.28 379 -21.69 0.0008
2018-02-09 2017-12-31 13F PLUG POWER INC COM COM 72919P202 205,120 -39,928 -16.29 484 -24.37 0.0010
2017-11-06 2017-09-30 13F PLUG POWER INC COM COM 72919P202 245,048 3,300 1.37 640 29.82 0.0014
2017-08-02 2017-06-30 13F PLUG POWER INC COM COM 72919P202 241,748 28,442 13.33 493 67.69 0.0011
2017-05-02 2017-03-31 13F PLUG POWER INC COM COM 72919P202 213,306 8,143 3.97 294 19.51 0.0007
2017-01-27 2016-12-31 13F PLUG POWER INC COM COM 72919P202 205,163 24,468 13.54 246 -20.39 0.0006
2016-11-08 2016-09-30 13F PLUG POWER INC COM COM 72919P202 180,695 2,750 1.55 309 -6.65 0.0009
2016-08-11 2016-06-30 13F PLUG POWER INC COM COM 72919P202 177,945 -26,810 -13.09 331 -21.19 0.0010
2016-05-02 2016-03-31 13F PLUG POWER INC COM COM 72919P202 204,755 9,500 4.87 420 1.94 0.0013
2016-02-03 2015-12-31 13F PLUG POWER INC COM COM 72919P202 195,255 12,255 6.70 412 22.99 0.0013
2015-11-04 2015-09-30 13F PLUG POWER INC COM COM 72919P202 183,000 5,605 3.16 335 -22.99 0.0011
2015-08-04 2015-06-30 13F PLUG POWER INC COM COM 72919P202 177,395 -48,160 -21.35 435 -25.51 0.0014
2015-05-12 2015-03-31 13F PLUG POWER INC COM COM 72919P202 225,555 9,500 4.40 584 -9.88 0.0017
2015-02-06 2014-12-31 13F PLUG POWER INC COM COM 72919P202 216,055 12,855 6.33 648 -30.55 0.0019
2014-11-12 2014-09-30 13F PLUG POWER INC COM COM 72919P202 203,200 5,610 2.84 933 0.86 0.0028
2014-08-06 2014-06-30 13F PLUG POWER INC COM COM 72919P202 197,590 197,590 925 0.0027
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.