Ballard Power Systems Inc.BLDP

3 13D/G filings 1 distinct filers 0 insider transactions (365d)

Post-Filing Returns · across 3 activist filings on this issuer

Median 30d

+0.7%

avg -1.5%

Median 60d

-29.1%

avg -30.3%

Median 90d

—

avg —

Median 180d

—

avg —

Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Activist filings

3 SCHEDULE 13D/A

Distinct filers

single filer

Insiders (365d)

0 buys · 0 sales

Latest short DTC

2.16

as of 2026-07-31

Filed	Form	Filer	Stake	Shares
2026-05-19	SCHEDULE 13D/A	Weichai Power Hong Kong International Development Co., Ltd	10.32%	31,102,826	view →
2026-05-15	SCHEDULE 13D/A	Weichai Power Hong Kong International Development Co., Ltd	11.61%	34,999,826	view →
2026-05-13	SCHEDULE 13D/A	Weichai Power Hong Kong International Development Co., Ltd	—	39,252,826	view →

Settlement	Short Interest	Days to Cover	% Δ vs prior
2026-07-31	16,558,574	2.16	-35.7%
2026-07-15	25,762,152	4.93	+4.4%
2026-06-30	24,683,785	3.39	+13.1%
2026-06-15	21,826,070	2.38	+2.9%
2026-05-29	21,206,521	1.53	-4.2%
2026-05-15	22,130,897	1.72	+5.3%
2026-04-30	21,027,098	4.58	+1.4%
2026-04-15	20,730,810	7.11	+0.8%
2026-03-31	20,570,804	5.84	-15.7%
2026-03-13	24,390,355	5.56	+2.9%
2026-02-27	23,703,882	12.91	-3.2%
2026-02-13	24,497,367	10.38	+3.2%

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