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 | |
|---|---|---|---|---|---|---|---|
8001
Forrester Research
FORR
$237M
| $6.43K | ﹤0.01% |
765
-21,785
| -97% | -$142K |
2026 Q1
1 quarter
|
|
8002
CALL
Essent Group
ESNT
$5.9B
| $6.43K | ﹤0.01% |
+100
| New | +$6.05K |
2026 Q2
0 quarters
|
|
|
8003
PUT
Essent Group
ESNT
$5.9B
| $6.43K | ﹤0.01% |
100
| – | – |
2025 Q2
4 quarters
|
|
8004
PUT
ChipMOS TECHNOLOGIES
IMOS
$1.93B
| $6.42K | ﹤0.01% |
+100
| New | +$5.29K |
2026 Q2
0 quarters
|
|
8005
CALL
LiveOne
LVO
$34.7M
| $6.4K | ﹤0.01% |
+1,000
| New | +$5.65K |
2026 Q2
0 quarters
|
|
8006
PUT
DMC Global
BOOM
$107M
| $6.39K | ﹤0.01% |
+1,100
| New | +$7.15K |
2026 Q2
0 quarters
|
|
8007
PUT
Journey Medical
DERM
$144M
| $6.37K | ﹤0.01% |
900
+300
| +50% | +$1.71K |
2025 Q4
2 quarters
|
|
8008
CALL
Red Violet
RDVT
$1.25B
| $6.37K | ﹤0.01% |
+100
| New | +$4.73K |
2026 Q2
0 quarters
|
|
8009
Schwab Crypto Thematic Natural Language Processing ETF
STCE
$175M
| $6.36K | ﹤0.01% |
91
-153
| -63% | -$10.8K |
2026 Q1
1 quarter
|
|
8010
CALL
Stereotaxis
STXS
$100M
| $6.36K | ﹤0.01% |
3,700
-7,700
| -68% | -$14.5K |
2024 Q4
6 quarters
|
|
8011
CALL
MDU Resources
MDU
$4.07B
| $6.36K | ﹤0.01% |
300
-100
| -25% | -$2.18K |
2023 Q3
11 quarters
|
|
8012
YieldMax Bitcoin Option Income Strategy ETF
YBIT
$59.2M
| $6.33K | ﹤0.01% |
349
+270
| +342% | +$6.11K |
2026 Q1
1 quarter
|
|
8013
JinkoSolar
JKS
$426M
| $6.33K | ﹤0.01% |
+377
| New | +$8.26K |
2026 Q2
0 quarters
|
|
8014
CALL
Shinhan Financial Group
SHG
$31.9B
| $6.32K | ﹤0.01% |
+100
| New | +$6.56K |
2026 Q2
0 quarters
|
|
8015
PUT
Annovis Bio
ANVS
$42.3M
| $6.32K | ﹤0.01% |
3,400
+2,100
| +162% | +$4.08K |
2023 Q4
10 quarters
|
|
8016
CALL
Citizens
CIA
$184M
| $6.31K | ﹤0.01% |
+1,100
| New | +$5.97K |
2026 Q2
0 quarters
|
|
8017
CALL
Brixmor Property Group
BRX
$8.67B
| $6.31K | ﹤0.01% |
200
-2,500
| -93% | -$76.3K |
2018 Q2
32 quarters
|
|
8018
Energy Recovery
ERII
$340M
| $6.3K | ﹤0.01% |
699
-9,381
| -93% | -$89.2K |
2025 Q4
2 quarters
|
|
8019
PUT
Neonode
NEON
$12.6M
| $6.3K | ﹤0.01% |
6,700
+3,600
| +116% | +$5.34K |
2024 Q2
8 quarters
|
|
8020
CALL
AirSculpt Technologies
AIRS
$90.1M
| $6.3K | ﹤0.01% |
1,400
-30,900
| -96% | -$125K |
2025 Q3
3 quarters
|
|
8021
PUT
ReposiTrak
TRAK
$135M
| $6.3K | ﹤0.01% |
+700
| New | +$6.4K |
2026 Q2
0 quarters
|
|
8022
PUT
Sprott Junior Gold Miners ETF
SGDJ
$290M
| $6.29K | ﹤0.01% |
100
-500
| -83% | -$44K |
2025 Q1
5 quarters
|
|
8023
Zepp Health
ZEPP
$39M
| $6.28K | ﹤0.01% |
1,206
-7,445
| -86% | -$77.9K |
2025 Q4
2 quarters
|
|
8024
PUT
St. Joe Company
JOE
$3.95B
| $6.26K | ﹤0.01% |
100
-400
| -80% | -$26.2K |
2023 Q3
11 quarters
|
|
8025
iShares US Financials ETF
IYF
$3.87B
| $6.25K | ﹤0.01% |
+49
| New | +$6.08K |
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.