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 | |
|---|---|---|---|---|---|---|
|
NSLR
5026
CALL
Neostellar Capital Corp
NSLR
$205M
| $155K | ﹤0.01% |
12,400
+7,200
| +138% | +$94.8K |
|
5027
PUT
Arteris
AIP
$1.14B
| $155K | ﹤0.01% |
3,200
+2,700
| +540% | +$86.4K |
|
5028
CALL
Rhythm Pharmaceuticals
RYTM
$6.59B
| $155K | ﹤0.01% |
1,400
-2,100
| -60% | -$190K |
|
5029
CALL
UGI
UGI
$7.75B
| $155K | ﹤0.01% |
4,500
+700
| +18% | +$24.7K |
|
5030
Dianthus Therapeutics
DNTH
$4.88B
| $155K | ﹤0.01% |
1,594
-281
| -15% | -$24.5K |
|
5031
CALL
Cingulate
CING
$71.4M
| $155K | ﹤0.01% |
+28,400
| New | +$143K |
|
5032
CALL
Monte Rosa Therapeutics
GLUE
$1B
| $155K | ﹤0.01% |
6,400
-17,900
| -74% | -$338K |
|
5033
Equitable Holdings
EQH
$14.2B
| $155K | ﹤0.01% |
3,527
-3,611
| -51% | -$151K |
|
5034
CALL
Anterix
ATEX
$1.55B
| $154K | ﹤0.01% |
1,500
-12,900
| -90% | -$757K |
|
5035
CALL
Warner Music
WMG
$14.4B
| $154K | ﹤0.01% |
5,700
-78,400
| -93% | -$2.33M |
|
5036
PUT
Host Hotels & Resorts
HST
$15.4B
| $154K | ﹤0.01% |
6,500
-171,600
| -96% | -$3.83M |
|
5037
SiriusPoint
SPNT
$2.89B
| $154K | ﹤0.01% |
+6,414
| New | +$147K |
|
5038
Sun Communities
SUI
$13.6B
| $154K | ﹤0.01% |
1,283
+1,186
| +1,223% | +$148K |
|
5039
PUT
Chefs' Warehouse
CHEF
$4.55B
| $154K | ﹤0.01% |
1,600
-700
| -30% | -$54.2K |
|
5040
CALL
Microvision
MVIS
$44.7M
| $154K | ﹤0.01% |
31,333
-10,060
| -24% | -$83K |
|
5041
Remitly
RELY
$4.54B
| $153K | ﹤0.01% |
6,848
-57,116
| -89% | -$1.17M |
|
|
PEW
5042
GrabAGun Digital Holdings
PEW
$61.7M
| $153K | ﹤0.01% |
67,299
+35,272
| +110% | +$97.8K |
|
|
GRID
5043
PUT
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$11.9B
| $153K | ﹤0.01% |
800
+300
| +60% | +$56.3K |
|
5044
CALL
Urban Edge Properties
UE
$2.5B
| $153K | ﹤0.01% |
6,700
+6,500
| +3,250% | +$143K |
|
5045
PUT
First Industrial Realty Trust
FR
$8.11B
| $153K | ﹤0.01% |
2,500
+2,000
| +400% | +$124K |
|
5046
CALL
Diodes
DIOD
$4.48B
| $153K | ﹤0.01% |
1,400
-11,600
| -89% | -$1.18M |
|
5047
AbCellera Biologics
ABCL
$4.8B
| $153K | ﹤0.01% |
19,500
-181,736
| -90% | -$888K |
|
5048
UMB Financial
UMBF
$10B
| $153K | ﹤0.01% |
1,071
+809
| +309% | +$104K |
|
5049
indie Semiconductor
INDI
$686M
| $153K | ﹤0.01% |
+34,048
| New | +$136K |
|
5050
PUT
Brookdale Senior Living
BKD
$2.62B
| $153K | ﹤0.01% |
9,500
+5,500
| +138% | +$74.8K |
|
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.