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 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$42.6M |
| 2 |
Shopify
SHOP
|
+$39.6M |
| 3 |
iShares China Large-Cap ETF
FXI
|
+$35.4M |
| 4 |
Verizon
VZ
|
+$34.1M |
| 5 |
KraneShares CSI China Internet ETF
KWEB
|
+$34.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
AMC Entertainment Holdings
AMC
|
+$49.5M |
| 2 |
GE Aerospace
GE
|
+$35.2M |
| 3 |
Carnival Corporation Ltd
CCL
|
+$30.5M |
| 4 |
Advanced Micro Devices
AMD
|
+$28.8M |
| 5 |
Micron Technology
MU
|
+$23.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.61% |
| 2 | Consumer Discretionary | 0.43% |
| 3 | Healthcare | 0.35% |
| 4 | Communication Services | 0.23% |
| 5 | Financials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6876
CALL
Warby Parker
WRBY
$3.28B
| $65K | ﹤0.01% |
+1,400
| New | +$72.8K |
|
|
TWNK
6877
PUT
DELISTED
Hostess Brands, Inc. Class A Common Stock
TWNK
| $65K | ﹤0.01% |
3,200
-30,800
| -91% | -$572K |
|
|
AJRD
6878
PUT
DELISTED
Aerojet Rocketdyne Holdings
AJRD
| $65K | ﹤0.01% |
1,400
-14,200
| -91% | -$625K |
|
6879
CALL
Aqua Metals
AQMS
$8.99M
| $64K | ﹤0.01% |
264
-27
| -9% | -$9.51K |
|
6880
Atara Biotherapeutics
ATRA
$75.5M
| $64K | ﹤0.01% |
164
+133
| +429% | +$56K |
|
|
BBU
6881
CALL
DELISTED
Brookfield Business Partners
BBU
| $64K | ﹤0.01% |
+2,181
| New | +$66.1K |
|
6882
PUT
Camtek
CAMT
$6.18B
| $64K | ﹤0.01% |
1,400
-10,400
| -88% | -$443K |
|
6883
PUT
CBAK Energy Technology Ltd
CBAT
$44.3M
| $64K | ﹤0.01% |
41,400
-50,400
| -55% | -$104K |
|
6884
CALL
Cyclerion Therapeutics
CYCN
$14.9M
| $64K | ﹤0.01% |
1,880
-1,190
| -39% | -$56.2K |
|
6885
PUT
Fresenius Medical Care
FMS
$13.8B
| $64K | ﹤0.01% |
+2,000
| New | +$65.8K |
|
6886
Inspired Entertainment
INSE
$184M
| $64K | ﹤0.01% |
+4,956
| New | +$65.4K |
|
6887
CALL
Liberty Energy
LBRT
$3.05B
| $64K | ﹤0.01% |
6,700
+5,200
| +347% | +$60.4K |
|
6888
PUT
Dorian LPG
LPG
$2.03B
| $64K | ﹤0.01% |
5,100
+1,900
| +59% | +$24K |
|
6889
CALL
Mustang Bio
MBIO
$4.32M
| $64K | ﹤0.01% |
52
+12
| +30% | +$19.4K |
|
6890
PUT
Mistras Group
MG
$484M
| $64K | ﹤0.01% |
8,700
-59,300
| -87% | -$521K |
|
6891
PUT
nVent Electric
NVT
$24.9B
| $64K | ﹤0.01% |
1,700
-3,700
| -69% | -$131K |
|
|
OTRK
6892
PUT
DELISTED
Ontrak
OTRK
| $64K | ﹤0.01% |
113
-211
| -65% | -$148K |
|
6893
CALL
Ovid Therapeutics
OVID
$414M
| $64K | ﹤0.01% |
20,000
-30,400
| -60% | -$104K |
|
6894
PUT
Patterson-UTI
PTEN
$3.98B
| $64K | ﹤0.01% |
7,600
+3,700
| +95% | +$31.9K |
|
6895
Sun Communities
SUI
$15.2B
| $64K | ﹤0.01% |
308
-1,252
| -80% | -$247K |
|
|
SVM
6896
Silvercorp Metals
SVM
$2.07B
| $64K | ﹤0.01% |
17,230
-59,310
| -77% | -$240K |
|
6897
PUT
Tronox
TROX
$932M
| $64K | ﹤0.01% |
2,700
-15,700
| -85% | -$376K |
|
6898
Xylem
XYL
$27.3B
| $64K | ﹤0.01% |
+542
| New | +$67.3K |
|
|
PRSU
6899
CALL
Pursuit Attractions and Hospitality Inc
PRSU
$1.39B
| $64K | ﹤0.01% |
1,500
-14,500
| -91% | -$662K |
|
|
DXYN
6900
PUT
DELISTED
Dixie Group Inc
DXYN
| $64K | ﹤0.01% |
11,300
+8,100
| +253% | +$44.1K |
|
Similar funds
Simplex Trading's Q4 2021 Portfolio in Review
As of Q4 2021, Simplex Trading held 12,077 positions worth $99B, down 7.5% from $107B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading withdrew a net $10.8B in Q4 2021, closing 1,645 positions and reducing 4,258 holdings. Its most notable exit was Carnival Corporation Ltd, an estimated $30.5M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.61% of assets, up from 0.49% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares China Large-Cap ETF worth $33M.
- Simplex Trading's largest Q4 2021 buy was iShares China Large-Cap ETF: 902,666 shares worth $33M.
- Simplex Trading added most to State Street Financial Select Sector SPDR ETF in Q4 2021, an estimated $42.6M increase.
- Simplex Trading's biggest Q4 2021 reduction was AMC Entertainment Holdings, cutting an estimated $49.5M.
- Simplex Trading fully exited Carnival Corporation Ltd in Q4 2021, selling an estimated $30.5M.
- Simplex Trading's ten largest holdings make up 33% of its $99B portfolio in Q4 2021.
- Simplex Trading opened 2,269 new positions and closed 1,645 in Q4 2021.
- Simplex Trading's portfolio value fell 7.5% quarter-over-quarter to $99B.
Based on Simplex Trading's 13F filing for Q4 2021, filed 4 Feb 2022.