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 | |
|---|---|---|---|---|---|---|---|
6526
PUT
Titan America SA
TTAM
$2.47B
| $39.2K | ﹤0.01% |
+2,100
| New | +$34.5K |
2026 Q2
0 quarters
|
|
6527
PUT
Watts Water Technologies
WTS
$12.3B
| $39.1K | ﹤0.01% |
+100
| New | +$31.2K |
2026 Q2
0 quarters
|
|
6528
CALL
InnovAge Holding
INNV
$1.26B
| $39.1K | ﹤0.01% |
+3,300
| New | +$27K |
2026 Q2
0 quarters
|
|
6529
Flywire
FLYW
$2.37B
| $39.1K | ﹤0.01% |
2,224
-23,624
| -91% | -$349K |
2025 Q1
5 quarters
|
|
6530
State Street SPDR Bloomberg 1-10 Year TIPS ETF
TIPX
$2.11B
| $39K | ﹤0.01% |
2,060
+1,584
| +333% | +$30.3K |
2025 Q4
2 quarters
|
|
6531
CALL
Dianthus Therapeutics
DNTH
$4.44B
| $39K | ﹤0.01% |
+400
| New | +$34.9K |
2026 Q2
0 quarters
|
|
6532
PUT
Arcturus Therapeutics
ARCT
$282M
| $39K | ﹤0.01% |
5,800
+3,100
| +115% | +$24.4K |
2020 Q3
23 quarters
|
|
6533
Bicara Therapeutics
BCAX
$1.12B
| $38.9K | ﹤0.01% |
+1,309
| New | +$29.2K |
2026 Q2
0 quarters
|
|
|
HUSE
6534
CALL
DELISTED
Strategy Shares US Market Rotation Strategy ETF
HUSE
| $38.8K | ﹤0.01% |
1,700
+1,600
| +1,600% | +$36.5K |
2024 Q1
9 quarters
|
|
6535
PUT
Impact Shares Womens Empowerment ETF Trading
WOMN
$59.3M
| $38.7K | ﹤0.01% |
2,100
-200
| -9% | -$8.41K |
2025 Q3
3 quarters
|
|
6536
PUT
AudioCodes
AUDC
$277M
| $38.7K | ﹤0.01% |
+4,000
| New | +$36.5K |
2026 Q2
0 quarters
|
|
6537
CALL
PepGen
PEPG
$172M
| $38.7K | ﹤0.01% |
21,500
+21,300
| +10,650% | +$34.6K |
2025 Q3
3 quarters
|
|
6538
CytomX Therapeutics
CTMX
$486M
| $38.6K | ﹤0.01% |
10,286
-238,152
| -96% | -$909K |
2025 Q4
2 quarters
|
|
6539
CALL
Sinclair Inc
SBGI
$866M
| $38.5K | ﹤0.01% |
2,700
-3,000
| -53% | -$43.2K |
2023 Q1
13 quarters
|
|
6540
CALL
Park-Ohio Holdings
PKOH
$628M
| $38.4K | ﹤0.01% |
+1,000
| New | +$30.7K |
2026 Q2
0 quarters
|
|
6541
NEOS Gold High Income ETF
IAUI
$547M
| $38.4K | ﹤0.01% |
793
-1,058
| -57% | -$58K |
2025 Q3
3 quarters
|
|
6542
CALL
Ingram Micro Holding
INGM
$6.55B
| $38.4K | ﹤0.01% |
1,400
-15,900
| -92% | -$447K |
2025 Q4
2 quarters
|
|
6543
Nano X Imaging
NNOX
$27M
| $38.3K | ﹤0.01% |
32,984
+7,945
| +32% | +$15K |
2025 Q1
5 quarters
|
|
6544
Arq
ARQ
$76M
| $38.3K | ﹤0.01% |
15,004
-6,977
| -32% | -$17.3K |
2025 Q4
2 quarters
|
|
6545
CALL
Data I/O
DAIO
$26M
| $38.2K | ﹤0.01% |
+9,700
| New | +$30.4K |
2026 Q2
0 quarters
|
|
6546
PUT
DELISTED
Webster Financial
WBS
| $38.2K | ﹤0.01% |
500
| – | – |
2025 Q4
2 quarters
|
|
6547
Smithfield Foods
SFD
$7.21B
| $38.2K | ﹤0.01% |
+1,575
| New | +$42.1K |
2026 Q2
0 quarters
|
|
6548
CALL
Deluxe
DLX
$1.06B
| $38.2K | ﹤0.01% |
1,600
-2,100
| -57% | -$54.7K |
2018 Q2
32 quarters
|
|
6549
PUT
Angel Studios
ANGX
$704M
| $38.2K | ﹤0.01% |
10,400
+300
| +3% | +$850 |
2025 Q4
2 quarters
|
|
6550
CALL
FerroAtlántica
GSM
$723M
| $38.2K | ﹤0.01% |
12,000
-15,600
| -57% | -$64.5K |
2020 Q4
22 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.