Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6626
CALL
Lufax Holding
LU
$1.08B
| $35K | ﹤0.01% |
26,500
+2,600
| +11% | +$4.42K |
|
|
CEPU
6627
Central Puerto
CEPU
$2.11B
| $35K | ﹤0.01% |
2,352
+959
| +69% | +$14.5K |
|
|
BMNU
6628
T-REX 2X Long BMNR Daily Target ETF
BMNU
$400M
| $34.9K | ﹤0.01% |
5,225
+2,409
| +86% | +$38.7K |
|
6629
Opko Health
OPK
$1.22B
| $34.8K | ﹤0.01% |
23,233
+15,913
| +217% | +$20.3K |
|
|
SJT
6630
San Juan Basin Royalty Trust
SJT
$138M
| $34.8K | ﹤0.01% |
10,850
+4,359
| +67% | +$17.5K |
|
6631
UNIFI
UFI
$132M
| $34.8K | ﹤0.01% |
7,332
+2,864
| +64% | +$11.4K |
|
|
MAZE
6632
Maze Therapeutics
MAZE
$1.46B
| $34.8K | ﹤0.01% |
1,166
-44
| -4% | -$1.15K |
|
6633
The Bancorp
TBBK
$2.73B
| $34.8K | ﹤0.01% |
555
-453
| -45% | -$26K |
|
6634
Hyatt Hotels
H
$15.6B
| $34.7K | ﹤0.01% |
+179
| New | +$31.4K |
|
|
RDNW
6635
CALL
RideNow Group
RDNW
$228M
| $34.6K | ﹤0.01% |
5,200
| – | – |
|
6636
CALL
Descartes Systems
DSGX
$6.76B
| $34.6K | ﹤0.01% |
+500
| New | +$35.7K |
|
6637
PUT
LivePerson
LPSN
$38.2M
| $34.6K | ﹤0.01% |
18,200
+400
| +2% | +$962 |
|
|
EVMN
6638
CALL
Evommune Inc
EVMN
$445M
| $34.6K | ﹤0.01% |
+2,600
| New | +$60.4K |
|
6639
PUT
Genius Sports
GENI
$2B
| $34.5K | ﹤0.01% |
5,700
-1,400
| -20% | -$7.25K |
|
6640
Compass Minerals
CMP
$1.06B
| $34.5K | ﹤0.01% |
1,107
+869
| +365% | +$24.6K |
|
6641
PUT
Middleby
MIDD
$5.05B
| $34.4K | ﹤0.01% |
+200
| New | +$30.1K |
|
6642
VanEck Biotech ETF
BBH
$479M
| $34.3K | ﹤0.01% |
+169
| New | +$31.8K |
|
|
SPCL
6643
Defiance Daily 2X Space ETF
SPCL
$15.8M
| $34.3K | ﹤0.01% |
+740
| New | +$25.6K |
|
6644
CALL
STAG Industrial
STAG
$7.27B
| $34.3K | ﹤0.01% |
900
-800
| -47% | -$30.6K |
|
6645
Euronet Worldwide
EEFT
$2.76B
| $34.2K | ﹤0.01% |
+467
| New | +$32.6K |
|
6646
Cooper-Standard Automotive
CPS
$483M
| $34.2K | ﹤0.01% |
1,263
-4,464
| -78% | -$131K |
|
6647
CALL
CarGurus
CARG
$3.01B
| $34.1K | ﹤0.01% |
1,000
-500
| -33% | -$16.2K |
|
6648
Ocean Power Technologies
OPTT
$50.6M
| $34K | ﹤0.01% |
129,786
-22,529
| -15% | -$7.64K |
|
6649
PUT
Turning Point Brands
TPB
$1.51B
| $33.9K | ﹤0.01% |
400
-500
| -56% | -$41.5K |
|
6650
PUT
State Street
STT
$53.4B
| $33.9K | ﹤0.01% |
200
-100
| -33% | -$15.4K |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.