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 | |
|---|---|---|---|---|---|---|
7826
CALL
MacroGenics
MGNX
$280M
| $8.32K | ﹤0.01% |
1,800
-3,600
| -67% | -$13.6K |
|
7827
CALL
Waterstone Financial
WSBF
$387M
| $8.29K | ﹤0.01% |
400
-1,900
| -83% | -$35.4K |
|
7828
PUT
ANI Pharmaceuticals
ANIP
$1.64B
| $8.28K | ﹤0.01% |
+100
| New | +$8.02K |
|
7829
DocGo
DCGO
$39.8M
| $8.26K | ﹤0.01% |
16,009
-2,942
| -16% | -$1.76K |
|
7830
CALL
Phreesia
PHR
$679M
| $8.23K | ﹤0.01% |
800
-6,600
| -89% | -$61.3K |
|
7831
CALL
Malibu Boats
MBUU
$549M
| $8.23K | ﹤0.01% |
300
-200
| -40% | -$5.32K |
|
7832
PUT
Pampa Energía
PAM
$4.55B
| $8.21K | ﹤0.01% |
100
-100
| -50% | -$8.33K |
|
7833
Crescent Capital BDC
CCAP
$382M
| $8.21K | ﹤0.01% |
752
+474
| +171% | +$5.79K |
|
7834
Tradr 2X Long Innovation ETF
TARK
$17.4M
| $8.21K | ﹤0.01% |
171
-2,697
| -94% | -$119K |
|
7835
Shenandoah Telecom
SHEN
$697M
| $8.2K | ﹤0.01% |
544
-1,095
| -67% | -$17.2K |
|
|
HTT
7836
CALL
High Templar Tech Ltd
HTT
$405M
| $8.19K | ﹤0.01% |
3,200
+3,000
| +1,500% | +$7.82K |
|
7837
CALL
Neuronetics
STIM
$219M
| $8.19K | ﹤0.01% |
6,300
+1,100
| +21% | +$1.6K |
|
7838
Essex Property Trust
ESS
$17.9B
| $8.16K | ﹤0.01% |
28
+23
| +460% | +$6.18K |
|
7839
Timberland Bancorp
TSBK
$361M
| $8.15K | ﹤0.01% |
+182
| New | +$7.53K |
|
7840
Schwab 1000 Index ETF
SCHK
$5.89B
| $8.15K | ﹤0.01% |
+226
| New | +$7.89K |
|
7841
Aterian
ATER
$11.2M
| $8.15K | ﹤0.01% |
+6,172
| New | +$6.4K |
|
|
FINV
7842
PUT
FinVolution Group
FINV
$800M
| $8.14K | ﹤0.01% |
1,700
+800
| +89% | +$3.96K |
|
7843
PUT
Veru
VERU
$45M
| $8.14K | ﹤0.01% |
2,600
+1,400
| +117% | +$3.57K |
|
7844
PUT
Geospace Technologies
GEOS
$69.6M
| $8.12K | ﹤0.01% |
1,200
+200
| +20% | +$1.72K |
|
7845
Teleflex
TFX
$5.86B
| $8.11K | ﹤0.01% |
64
-160
| -71% | -$20.5K |
|
7846
CALL
Madison Square Garden
MSGE
$3.66B
| $8.09K | ﹤0.01% |
+100
| New | +$6.82K |
|
|
SNBR
7847
CALL
DELISTED
Sleep Number
SNBR
| $8.08K | ﹤0.01% |
336,600
+336,300
| +112,100% | +$564K |
|
7848
CALL
Duluth Holdings
DLTH
$172M
| $8.06K | ﹤0.01% |
1,800
+1,200
| +200% | +$4.33K |
|
7849
PUT
InflaRx
IFRX
$327M
| $8.06K | ﹤0.01% |
+3,600
| New | +$6.76K |
|
7850
CALL
CareCloud
CCLD
$94.8M
| $8.06K | ﹤0.01% |
3,800
+2,300
| +153% | +$5.95K |
|
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.