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 | |
|---|---|---|---|---|---|---|
|
OMDA
4351
PUT
Omada Health Inc
OMDA
$1.15B
| $268K | ﹤0.01% |
12,200
+6,000
| +97% | +$95.8K |
|
4352
PUT
CPS Technologies
CPSH
$72.7M
| $268K | ﹤0.01% |
48,500
+34,100
| +237% | +$200K |
|
4353
PUT
Pangaea Logistics
PANL
$526M
| $267K | ﹤0.01% |
41,100
| – | – |
|
4354
CALL
CytomX Therapeutics
CTMX
$586M
| $267K | ﹤0.01% |
71,200
-36,600
| -34% | -$140K |
|
4355
PUT
BCE
BCE
$19B
| $267K | ﹤0.01% |
12,400
-2,700
| -18% | -$64.8K |
|
4356
PUT
Sun Life Financial
SLF
$43.7B
| $267K | ﹤0.01% |
+3,400
| New | +$245K |
|
4357
CALL
Clearfield
CLFD
$415M
| $267K | ﹤0.01% |
6,700
+6,600
| +6,600% | +$242K |
|
4358
Grindr
GRND
$2.74B
| $267K | ﹤0.01% |
18,546
-432
| -2% | -$5.59K |
|
4359
PUT
Biohaven
BHVN
$1.98B
| $266K | ﹤0.01% |
17,900
-8,900
| -33% | -$95.8K |
|
4360
CALL
Healthcare Realty
HR
$6.14B
| $266K | ﹤0.01% |
13,200
-1,700
| -11% | -$33K |
|
4361
Invesco S&P SmallCap Energy ETF
PSCE
$102M
| $266K | ﹤0.01% |
4,842
+2,233
| +86% | +$134K |
|
4362
CALL
LegalZoom.com
LZ
$940M
| $266K | ﹤0.01% |
43,400
-30,900
| -42% | -$189K |
|
|
LITX
4363
Tradr 2X Long LITE Daily ETF
LITX
$281M
| $266K | ﹤0.01% |
7,699
-3,061
| -28% | -$129K |
|
4364
Hudbay
HBM
$12B
| $265K | ﹤0.01% |
+11,240
| New | +$284K |
|
4365
CALL
Personalis
PSNL
$1.73B
| $265K | ﹤0.01% |
19,800
+15,400
| +350% | +$125K |
|
4366
PUT
InfraCap MLP ETF
AMZA
$458M
| $265K | ﹤0.01% |
12,300
-100
| -0.8% | -$4.63K |
|
|
OPTU
4367
PUT
Optimum Communications Inc
OPTU
$385M
| $265K | ﹤0.01% |
182,900
+182,400
| +36,480% | +$227K |
|
4368
MarketAxess Holdings
MKTX
$5.77B
| $265K | ﹤0.01% |
+2,336
| New | +$333K |
|
4369
Applied Industrial Technologies
AIT
$12.3B
| $265K | ﹤0.01% |
+784
| New | +$241K |
|
4370
PUT
Agree Realty
ADC
$8.38B
| $265K | ﹤0.01% |
3,500
+1,400
| +67% | +$106K |
|
|
ADUR
4371
CALL
Aduro Clean Technologies
ADUR
$443M
| $265K | ﹤0.01% |
16,800
+14,700
| +700% | +$199K |
|
|
EFXT
4372
CALL
Enerflex
EFXT
$2.81B
| $265K | ﹤0.01% |
+10,800
| New | +$269K |
|
4373
CALL
Janux Therapeutics
JANX
$1.02B
| $264K | ﹤0.01% |
17,200
-37,400
| -68% | -$542K |
|
4374
CALL
Erie Indemnity
ERIE
$11.5B
| $264K | ﹤0.01% |
1,100
+800
| +267% | +$183K |
|
|
MOMO
4375
CALL
Hello Group
MOMO
$691M
| $263K | ﹤0.01% |
45,400
+5,600
| +14% | +$33.4K |
|
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.