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 | |
|---|---|---|---|---|---|---|
5726
CALL
Ooma
OOMA
$637M
| $86.5K | ﹤0.01% |
4,500
-1,800
| -29% | -$30.9K |
|
5727
CALL
Federal Realty Investment Trust
FRT
$10.2B
| $86.4K | ﹤0.01% |
700
-5,900
| -89% | -$686K |
|
5728
iShares MBS ETF
MBB
$39.5B
| $86.4K | ﹤0.01% |
+914
| New | +$86.4K |
|
|
ORLA
5729
DELISTED
Orla Mining
ORLA
| $86.4K | ﹤0.01% |
8,821
-41,722
| -83% | -$555K |
|
|
XXRP
5730
Teucrium 2x Long Daily XRP ETF
XXRP
$148M
| $86.2K | ﹤0.01% |
4,189
+2,588
| +162% | +$90.8K |
|
|
INV
5731
PUT
Innventure Inc
INV
$93.9M
| $86.2K | ﹤0.01% |
17,000
+8,900
| +110% | +$52.3K |
|
5732
CALL
TFI International
TFII
$11.3B
| $86.1K | ﹤0.01% |
600
-2,100
| -78% | -$296K |
|
5733
PUT
STAAR Surgical
STAA
$1.18B
| $86.1K | ﹤0.01% |
3,000
-800
| -21% | -$22.2K |
|
5734
PUT
Mirion Technologies
MIR
$4.12B
| $86.1K | ﹤0.01% |
4,800
+400
| +9% | +$7.42K |
|
5735
iShares S&P 500 Value ETF
IVE
$50.1B
| $86.1K | ﹤0.01% |
+379
| New | +$84.7K |
|
5736
PUT
Cerence
CRNC
$386M
| $86K | ﹤0.01% |
7,600
-14,100
| -65% | -$138K |
|
5737
CALL
Microbot Medical
MBOT
$96.7M
| $86K | ﹤0.01% |
44,100
-12,400
| -22% | -$25.3K |
|
5738
PUT
American Public Education
APEI
$830M
| $85.9K | ﹤0.01% |
1,600
-200
| -11% | -$11K |
|
5739
AnaptysBio
ANAB
$1.68B
| $85.5K | ﹤0.01% |
+1,267
| New | +$76.8K |
|
5740
PUT
Future Fuel
FF
$231M
| $85.4K | ﹤0.01% |
18,900
+11,100
| +142% | +$47.8K |
|
5741
PUT
Boise Cascade
BCC
$2.76B
| $85.4K | ﹤0.01% |
1,100
-400
| -27% | -$29.7K |
|
5742
CALL
Lightbridge
LTBR
$284M
| $85.3K | ﹤0.01% |
9,700
+5,100
| +111% | +$57.4K |
|
5743
PUT
Fortrea Holdings
FTRE
$1.68B
| $85.3K | ﹤0.01% |
4,900
+4,700
| +2,350% | +$63.5K |
|
5744
Anavex Life Sciences
AVXL
$265M
| $85.2K | ﹤0.01% |
32,889
-14,978
| -31% | -$44.3K |
|
5745
CALL
ProShares UltraShort Industrials
SIJ
$6.24M
| $85.1K | ﹤0.01% |
6,400
+3,200
| +100% | +$57.1K |
|
5746
ASP Isotopes
ASPI
$644M
| $85K | ﹤0.01% |
13,664
-47,984
| -78% | -$282K |
|
5747
AtriCure
ATRC
$2.62B
| $84.9K | ﹤0.01% |
3,034
+522
| +21% | +$14.7K |
|
5748
CALL
Hamilton Insurance Group
HG
$3.51B
| $84.8K | ﹤0.01% |
2,500
-17,900
| -88% | -$561K |
|
5749
CALL
State Street
STT
$53.4B
| $84.8K | ﹤0.01% |
500
-400
| -44% | -$61.7K |
|
5750
CALL
Getty Images
GETY
$98.1M
| $84.7K | ﹤0.01% |
98,500
+90,900
| +1,196% | +$78.7K |
|
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.