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 | |
|---|---|---|---|---|---|---|
6176
CALL
Innovative Industrial Properties
IIPR
$1.7B
| $105K | ﹤0.01% |
400
-10,200
| -96% | -$2.62M |
|
6177
CALL
Invivyd
IVVD
$178M
| $105K | ﹤0.01% |
+14,500
| New | +$377K |
|
6178
iShares MBS ETF
MBB
$39.1B
| $105K | ﹤0.01% |
+981
| New | +$106K |
|
6179
CALL
Magnolia Oil & Gas
MGY
$5.62B
| $105K | ﹤0.01% |
5,600
| – | – |
|
6180
CALL
SFL Corp
SFL
$1.58B
| $105K | ﹤0.01% |
13,000
-15,800
| -55% | -$131K |
|
6181
CALL
Trinity Industries
TRN
$2.59B
| $105K | ﹤0.01% |
3,500
-19,800
| -85% | -$566K |
|
|
ONIT
6182
Onity Group
ONIT
$321M
| $105K | ﹤0.01% |
2,648
+1,563
| +144% | +$52.8K |
|
|
SQSP
6183
DELISTED
Squarespace, Inc.
SQSP
| $105K | ﹤0.01% |
3,564
+2,973
| +503% | +$108K |
|
|
CIO
6184
PUT
DELISTED
City Office REIT
CIO
| $104K | ﹤0.01% |
5,300
-9,700
| -65% | -$178K |
|
6185
Castor Maritime
CTRM
$20.1M
| $104K | ﹤0.01% |
+7,387
| New | +$152K |
|
6186
CALL
Dana Inc
DAN
$3.01B
| $104K | ﹤0.01% |
4,600
-9,900
| -68% | -$230K |
|
6187
PUT
Kite Realty
KRG
$5.56B
| $104K | ﹤0.01% |
4,800
+3,100
| +182% | +$66.3K |
|
|
LL
6188
CALL
DELISTED
LL Flooring Holdings, Inc.
LL
| $104K | ﹤0.01% |
6,100
-13,400
| -69% | -$236K |
|
|
MILE
6189
DELISTED
Metromile, Inc. Common Stock
MILE
| $104K | ﹤0.01% |
+47,831
| New | +$136K |
|
|
CNR
6190
PUT
DELISTED
Cornerstone Building Brands, Inc.
CNR
| $104K | ﹤0.01% |
6,000
-21,500
| -78% | -$334K |
|
6191
CALL
Akebia Therapeutics
AKBA
$346M
| $103K | ﹤0.01% |
45,600
-9,000
| -16% | -$24.5K |
|
6192
Altisource Portfolio Solutions
ASPS
$63.8M
| $103K | ﹤0.01% |
1,158
+68
| +6% | +$6.6K |
|
6193
Capricor Therapeutics
CAPR
$228M
| $103K | ﹤0.01% |
35,291
+18,431
| +109% | +$64.6K |
|
6194
CALL
Compugen
CGEN
$216M
| $103K | ﹤0.01% |
24,000
+15,800
| +193% | +$85.5K |
|
6195
PUT
DoubleVerify
DV
$1.84B
| $103K | ﹤0.01% |
3,100
+3,000
| +3,000% | +$100K |
|
6196
Establishment Labs
ESTA
$2.69B
| $103K | ﹤0.01% |
+1,533
| New | +$107K |
|
6197
CGI
GIB
$15B
| $103K | ﹤0.01% |
1,164
-929
| -44% | -$81.4K |
|
6198
MarineMax
HZO
$793M
| $103K | ﹤0.01% |
1,746
-14,824
| -89% | -$793K |
|
6199
PUT
Iridium Communications
IRDM
$5.13B
| $103K | ﹤0.01% |
2,500
-15,200
| -86% | -$614K |
|
6200
CALL
Ormat Technologies
ORA
$6.02B
| $103K | ﹤0.01% |
1,300
-13,900
| -91% | -$1.05M |
|
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.