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 | |
|---|---|---|---|---|---|---|---|
8801
DELISTED
Liberty Broadband Class A
LBRDA
| $1.1K | ﹤0.01% |
+33
| New | +$1.28K |
2026 Q2
0 quarters
|
|
8802
PUT
Cibus
CBUS
$108M
| $1.1K | ﹤0.01% |
800
| – | – |
2026 Q1
1 quarter
|
|
8803
PUT
Cars.com
CARS
$586M
| $1.09K | ﹤0.01% |
100
-1,500
| -94% | -$15.2K |
2025 Q3
3 quarters
|
|
8804
PUT
BrightSpire Capital
BRSP
$463M
| $1.09K | ﹤0.01% |
+200
| New | +$1.15K |
2026 Q2
0 quarters
|
|
8805
Greenlight Captial
GLRE
$493M
| $1.08K | ﹤0.01% |
67
-6,279
| -99% | -$108K |
2025 Q3
3 quarters
|
|
8806
CALL
Aware
AWRE
$18.9M
| $1.08K | ﹤0.01% |
800
+300
| +60% | +$400 |
2025 Q3
3 quarters
|
|
8807
Artivion
AORT
$1.14B
| $1.08K | ﹤0.01% |
+48
| New | +$1.34K |
2026 Q2
0 quarters
|
|
8808
CALL
HUTCHMED
HCM
$2.5B
| $1.08K | ﹤0.01% |
100
-1,100
| -92% | -$13.9K |
2025 Q4
2 quarters
|
|
8809
First Trust Nasdaq Artificial Intelligence and Robotics ETF
ROBT
$752M
| $1.07K | ﹤0.01% |
19
-29
| -60% | -$1.55K |
2025 Q2
4 quarters
|
|
8810
PUT
Entera Bio
ENTX
$508M
| $1.06K | ﹤0.01% |
+600
| New | +$751 |
2026 Q2
0 quarters
|
|
8811
ProShares S&P 500 High Income ETF
ISPY
$1.15B
| $1.06K | ﹤0.01% |
+22
| New | +$1.03K |
2026 Q2
0 quarters
|
|
8812
Niu Technologies
NIU
$145M
| $1.05K | ﹤0.01% |
523
-12,200
| -96% | -$32.3K |
2024 Q3
7 quarters
|
|
8813
PUT
Gevo
GEVO
$287M
| $1.05K | ﹤0.01% |
700
-700
| -50% | -$1.23K |
2021 Q2
20 quarters
|
|
8814
CALL
Lands' End
LE
$283M
| $1.05K | ﹤0.01% |
100
-31,600
| -100% | -$363K |
2026 Q1
1 quarter
|
|
8815
LuxExperience B.V.
LUXE
$1.31B
| $1.05K | ﹤0.01% |
141
-104
| -42% | -$831 |
2024 Q3
7 quarters
|
|
8816
CALL
Varex Imaging
VREX
$782M
| $1.04K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8817
PUT
ALX Oncology
ALXO
$162M
| $1.03K | ﹤0.01% |
500
-29,900
| -98% | -$53.5K |
2023 Q4
10 quarters
|
|
8818
CALL
DELISTED
Olaplex Holdings
OLPX
| $1.02K | ﹤0.01% |
500
-100
| -17% | -$204 |
2025 Q2
4 quarters
|
|
8819
PUT
Spok Holdings
SPOK
$215M
| $1.02K | ﹤0.01% |
100
-100
| -50% | -$1.09K |
2022 Q4
14 quarters
|
|
8820
CALL
Canary Litecoin ETF
LTCC
$7.38M
| $1.02K | ﹤0.01% |
100
| – | – |
2025 Q4
2 quarters
|
|
8821
Invesco S&P SmallCap 600 Pure Growth ETF
RZG
$118M
| $1.02K | ﹤0.01% |
+14
| New | +$902 |
2026 Q2
0 quarters
|
|
8822
PUT
DELISTED
Maxeon Solar Technologies
MAXN
| $1.01K | ﹤0.01% |
3,900
+100
| +3% | +$136 |
2026 Q1
1 quarter
|
|
8823
Proshares Ultra XRP ETF
UXRP
$38.7M
| $1.01K | ﹤0.01% |
102
+47
| +85% | +$792 |
2025 Q3
3 quarters
|
|
8824
PUT
Silvercrest Asset Management
SAMG
$79.2M
| $1.01K | ﹤0.01% |
+100
| New | +$1.22K |
2026 Q2
0 quarters
|
|
8825
CALL
Savers
SVV
$1.44B
| $1.01K | ﹤0.01% |
100
-3,100
| -97% | -$26.9K |
2024 Q4
6 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.