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 | Held Since | |
|---|---|---|---|---|---|---|---|
7326
PUT
Zentalis Pharmaceuticals
ZNTL
$209M
| $15.5K | ﹤0.01% |
3,200
+600
| +23% | +$2.4K |
2026 Q1
1 quarter
|
|
7327
CALL
Brainsway
BWAY
$453M
| $15.5K | ﹤0.01% |
+1,000
| New | +$15.1K |
2026 Q2
0 quarters
|
|
7328
CALL
IRSA Inversiones y Representaciones
IRS
$1.24B
| $15.4K | ﹤0.01% |
1,000
+900
| +900% | +$13.7K |
2026 Q1
1 quarter
|
|
7329
NPK International
NPKI
$925M
| $15.4K | ﹤0.01% |
969
+694
| +252% | +$10.5K |
2025 Q4
2 quarters
|
|
7330
PUT
Anixa Biosciences
ANIX
$104M
| $15.4K | ﹤0.01% |
+5,500
| New | +$15.3K |
2026 Q2
0 quarters
|
|
7331
CALL
GrowGeneration
GRWG
$83.1M
| $15.4K | ﹤0.01% |
10,400
-41,500
| -80% | -$58.8K |
2025 Q2
4 quarters
|
|
7332
CALL
Patria Investments
PAX
$1.92B
| $15.4K | ﹤0.01% |
1,400
-2,500
| -64% | -$29.8K |
2021 Q1
21 quarters
|
|
7333
PUT
BCP Investment Corp
BCIC
$73.6M
| $15.3K | ﹤0.01% |
2,100
+1,900
| +950% | +$14.6K |
2025 Q4
2 quarters
|
|
7334
Precision BioSciences
DTIL
$183M
| $15.3K | ﹤0.01% |
1,942
-1,570
| -45% | -$11K |
2025 Q4
2 quarters
|
|
7335
Magnachip Semiconductor
MX
$180M
| $15.3K | ﹤0.01% |
3,225
+3,078
| +2,094% | +$14.9K |
2026 Q1
1 quarter
|
|
7336
PUT
Southern Missouri Bancorp
SMBC
$792M
| $15.2K | ﹤0.01% |
200
+100
| +100% | +$6.91K |
2026 Q1
1 quarter
|
|
7337
CALL
Beacon Financial Corp
BBT
$2.52B
| $15.2K | ﹤0.01% |
500
+200
| +67% | +$5.99K |
2026 Q1
1 quarter
|
|
7338
PUT
Insulet
PODD
$10.3B
| $15.2K | ﹤0.01% |
+100
| New | +$16.7K |
2026 Q2
0 quarters
|
|
7339
CALL
DELISTED
Siren ETF Trust Siren NexGen Economy ETF
BLCN
| $15.2K | ﹤0.01% |
600
-100
| -14% | -$2.48K |
2025 Q2
4 quarters
|
|
7340
Welltower
WELL
$171B
| $15.2K | ﹤0.01% |
+67
| New | +$14.2K |
2026 Q2
0 quarters
|
|
7341
PUT
Raymond James Financial
RJF
$30.3B
| $15.2K | ﹤0.01% |
+100
| New | +$15.2K |
2026 Q2
0 quarters
|
|
7342
CALL
Nano X Imaging
NNOX
$29.3M
| $15.2K | ﹤0.01% |
13,100
-5,900
| -31% | -$11.1K |
2020 Q3
23 quarters
|
|
7343
Forward Industries Inc
FWDI
$519M
| $15.2K | ﹤0.01% |
+3,593
| New | +$16K |
2026 Q2
0 quarters
|
|
7344
Coherus Oncology
CHRS
$156M
| $15.1K | ﹤0.01% |
10,820
-33,582
| -76% | -$54.8K |
2025 Q1
5 quarters
|
|
7345
CALL
Janus Henderson Small Cap Growth Alpha ETF
JSML
$354M
| $15.1K | ﹤0.01% |
300
+200
| +200% | +$16.7K |
2024 Q3
7 quarters
|
|
7346
PUT
Idacorp
IDA
$8.14B
| $15.1K | ﹤0.01% |
100
-16,800
| -99% | -$2.42M |
2024 Q1
9 quarters
|
|
7347
PUT
Playboy Inc
PLBY
$131M
| $15.1K | ﹤0.01% |
12,400
-23,600
| -66% | -$35.8K |
2021 Q1
21 quarters
|
|
7348
PUT
Seadrill
SDRL
$3.27B
| $15.1K | ﹤0.01% |
400
-100
| -20% | -$4.66K |
2026 Q1
1 quarter
|
|
7349
PUT
JinkoSolar
JKS
$440M
| $15.1K | ﹤0.01% |
900
-600
| -40% | -$13.1K |
2021 Q2
20 quarters
|
|
7350
CALL
Newmark Group
NMRK
$2.09B
| $15.1K | ﹤0.01% |
1,000
-200
| -17% | -$3.05K |
2025 Q4
2 quarters
|
|
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.