ALDEYRA THERAPEUTICS INC (ALDX) Stock Institutional Trading Activity


ALDEYRA THERAPEUTICS INC (ALDX) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2025Renaissance Technologies LLCBuy152,700350,000$1,813,000
Q3 2025Renaissance Technologies LLCBuy84,500197,300$1,029,906
Q2 2025Renaissance Technologies LLCSell-3,800112,800$432,024
Q1 2025Renaissance Technologies LLCSell-50,500116,600$670,450
Q4 2024Renaissance Technologies LLCBuy59,700167,100$833,829
Q3 2024Renaissance Technologies LLCSell-395,900107,400$578,886
Q2 2024Renaissance Technologies LLCSell-224,390503,300$1,665,923
Q1 2024Renaissance Technologies LLCBuy427,690727,690$2,380
Q4 2023Renaissance Technologies LLCBuy78,200300,000$1,053
Q3 2023Renaissance Technologies LLCSell-83,556221,800$1,482
Q2 2023Renaissance Technologies LLCBuy57,956305,356$2,562
Q1 2023Renaissance Technologies LLCBuy33,900247,400$2,457
Q4 2022Renaissance Technologies LLCSell-164,800213,500$1,486
Q3 2022Renaissance Technologies LLCSell-135,800378,300$2,020
Q2 2022Renaissance Technologies LLCBuy460,300514,100$2,051
Q4 2020Renaissance Technologies LLCSell-25,81853,800$369
Q2 2020Renaissance Technologies LLCSell-516,78279,618$332
Q1 2020Renaissance Technologies LLCBuy517,200596,400$1,473
Q4 2019Renaissance Technologies LLCSell-11,00079,200$460
Q2 2019Renaissance Technologies LLCBuy78,20090,200$541
Q4 2018Renaissance Technologies LLCBuy70012,000$100
Q3 2018Renaissance Technologies LLCSell-19,30011,300$156
Q1 2018Renaissance Technologies LLCSell-31,50030,600$230
Q4 2017Renaissance Technologies LLCSell-23,10062,100$422
Q3 2017Renaissance Technologies LLCBuy29,90085,200$613
Q2 2017Renaissance Technologies LLCBuy29,00055,300$257
Q1 2017Renaissance Technologies LLCBuy26,30026,300$132

Frequently asked questions about ALDX activity

  • Which institutional owners are buying ALDX?

    Institutional owners buying ALDX include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in ALDX activity?

    "Buy" means an investor increased their reported position in ALDX compared to the prior reporting period. This reflects growing exposure to ALDEYRA THERAPEUTICS INC (ALDX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in ALDX increasing?

    Institutional interest in ALDX can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.