SIMPLEX TRADING, LLC JSPR — JASPER THERAPEUTICS INC

Ownership history in SIMPLEX TRADING, LLC  ·  5 quarters on record

AI Ownership Summary

SIMPLEX TRADING, LLC reported JASPER THERAPEUTICS INC (JSPR) in 5 quarterly 13F filings from 2024 Q1 through 2026 Q1. The latest visible filing shows JSPR at 0.00% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this JSPR ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was SIMPLEX TRADING, LLC's position in JASPER THERAPEUTICS INC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2026 Q1

JSPR was reported at 0.00% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.0% in 2024 Q2

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2024 Q1 to 2026 Q1

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

JSPR stock page SIMPLEX TRADING, LLC fund profile SIMPLEX TRADING, LLC full holdings
How SIMPLEX TRADING, LLC held JSPR — position size vs. price
% of Fund (quarterly)    JSPR price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 5 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 ADDED — — — 29,273 +14,248 +94.8% 0.00% $26K 2026-05-14 $0.96
2025 Q2 ADDED — — — 15,025 +13,671 +1009.7% 0.00% $83K 2025-08-05 $2.98
2024 Q3 REDUCED 76.7% +11.4% ❌ 1,354 -4,467 -76.7% 0.00% $25K 2024-11-08 $24.53
2024 Q2 ADDED — — — 5,821 +2,063 +54.9% 0.00% $132K 2024-07-25 $21.26
2024 Q1 INITIATED — — — 3,758 — — 0.00% $110K 2024-04-25 $21.18

🏢 Other funds also holding JSPR

As of 2026 Q1 — sorted by position size

Lion Point Capital, LP 3Y 7Y 2.44% Velan Capital Investment Management LP 3Y 1.46% ACORN CAPITAL ADVISORS, LLC 0.35% KINGDON CAPITAL MANAGEMENT, L.L.C. 3Y 7Y 0.13% Knott David M Jr 3Y 0.08% Verdad Advisers, LP 3Y 0.07% Rock Springs Capital Management LP 3Y 7Y 0.06% DIKER MANAGEMENT LLC 3Y 7Y 0.03% Quarry LP 3Y 0.02% Soleus Capital Management, L.P. 3Y 0.01%

FAQ About SIMPLEX TRADING, LLC and JSPR

These are the practical questions this page is built to answer before you even open the full history table.

How long has SIMPLEX TRADING, LLC reported owning JSPR?

SIMPLEX TRADING, LLC reported JSPR across 5 quarterly 13F filings, from 2024 Q1 through 2026 Q1.

What was the largest reported JSPR position in SIMPLEX TRADING, LLC's portfolio?

The largest reported portfolio weight for JSPR was 0.00% in 2024 Q2.

What is the latest reported JSPR position on this page?

The most recent filing on this page is 2026 Q1, when SIMPLEX TRADING, LLC reported 29,273 shares, equal to 0.00% of portfolio, with an estimated market value of $26K.

What does the chart on this JSPR ownership page compare?

The chart compares SIMPLEX TRADING, LLC's quarterly JSPR portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did SIMPLEX TRADING, LLC time their JSPR position?

Based on 13F filing dates vs. subsequent JSPR price moves, SIMPLEX TRADING, LLC correctly timed 3 out of 4 reported position changes (75%). The annualised alpha on JSPR relative to SPY over the holding period was -5.7%.

← Back to SIMPLEX TRADING, LLC Holdings