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 | |
|---|---|---|---|---|---|---|---|
8876
PUT
Streamex Corp
STEX
$51.2M
| $765 | ﹤0.01% |
900
-6,000
| -87% | -$6.21K |
2025 Q3
3 quarters
|
|
8877
PUT
Metalla Royalty & Streaming
MTA
$682M
| $761 | ﹤0.01% |
100
-500
| -83% | -$3.54K |
2025 Q4
2 quarters
|
|
8878
Citius Pharmaceuticals
CTXR
$11.1M
| $759 | ﹤0.01% |
+1,256
| New | +$850 |
2026 Q2
0 quarters
|
|
8879
CALL
Mativ Holdings
MATV
$666M
| $757 | ﹤0.01% |
+100
| New | +$861 |
2026 Q2
0 quarters
|
|
|
8880
PUT
Mativ Holdings
MATV
$666M
| $757 | ﹤0.01% |
+100
| New | +$861 |
2026 Q2
0 quarters
|
|
8881
iShares MSCI Switzerland ETF
EWL
$2.92B
| $754 | ﹤0.01% |
12
-9
| -43% | -$554 |
2026 Q1
1 quarter
|
|
8882
InvenTrust Properties
IVT
$2.35B
| $743 | ﹤0.01% |
+21
| New | +$690 |
2026 Q2
0 quarters
|
|
8883
CALL
LuxExperience B.V.
LUXE
$1.31B
| $743 | ﹤0.01% |
+100
| New | +$799 |
2026 Q2
0 quarters
|
|
|
8884
PUT
LuxExperience B.V.
LUXE
$1.31B
| $743 | ﹤0.01% |
100
-500
| -83% | -$3.99K |
2023 Q3
11 quarters
|
|
8885
PUT
Stoneridge
SRI
$167M
| $732 | ﹤0.01% |
+100
| New | +$686 |
2026 Q2
0 quarters
|
|
8886
CALL
Real REMAX Group Inc. Common Stock
REAX
$347M
| $727 | ﹤0.01% |
40
-1,840
| -98% | -$37.4K |
2024 Q4
6 quarters
|
|
8887
Workiva
WK
$4.67B
| $727 | ﹤0.01% |
+15
| New | +$773 |
2026 Q2
0 quarters
|
|
8888
GraniteShares YieldBOOST QQQ ETF
TQQY
$5.2M
| $727 | ﹤0.01% |
56
+1
| +2% | +$13 |
2026 Q1
1 quarter
|
|
|
8889
CALL
DELISTED
Citius Pharmaceuticals, Inc. Warrant
CTXRW
| $726 | ﹤0.01% |
1,200
-41,300
| -97% | -$25K |
2025 Q2
4 quarters
|
|
8890
DELISTED
Olaplex Holdings
OLPX
| $725 | ﹤0.01% |
354
-125,619
| -100% | -$256K |
2025 Q4
2 quarters
|
|
8891
PUT
Global Water Resources
GWRS
$228M
| $724 | ﹤0.01% |
100
| – | – |
2025 Q3
3 quarters
|
|
8892
OptimizeRx
OPRX
$172M
| $720 | ﹤0.01% |
+126
| New | +$724 |
2026 Q2
0 quarters
|
|
8893
U-Haul Holding Co
UHAL
$10.8B
| $719 | ﹤0.01% |
+11
| New | +$603 |
2026 Q2
0 quarters
|
|
|
ABVE
8894
DELISTED
Above Food Ingredients Inc
ABVE
| $718 | ﹤0.01% |
+7,980
| New | +$5.11K |
2026 Q2
0 quarters
|
|
8895
Valaris
VAL
$6.76B
| $703 | ﹤0.01% |
84
| – | – |
2025 Q4
2 quarters
|
|
8896
Wrap Technologies
WRAP
$75.4M
| $701 | ﹤0.01% |
544
-13,775
| -96% | -$19.4K |
2024 Q4
6 quarters
|
|
8897
enGene Therapeutics
ENGN
$105M
| $690 | ﹤0.01% |
+399
| New | +$1.63K |
2026 Q2
0 quarters
|
|
8898
WaFd
WAFD
$2.18B
| $690 | ﹤0.01% |
18
-284
| -94% | -$10K |
2026 Q1
1 quarter
|
|
8899
SkyAI Inc
SKYA
$125M
| $688 | ﹤0.01% |
620
+164
| +36% | +$263 |
2025 Q4
2 quarters
|
|
8900
PUT
Blend Labs
BLND
$277M
| $684 | ﹤0.01% |
+400
| New | +$638 |
2026 Q2
0 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.