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 | |
|---|---|---|---|---|---|---|
5801
PUT
Rush Street Interactive
RSI
$2.93B
| $132K | ﹤0.01% |
8,000
-57,600
| -88% | -$1.09M |
|
|
SCWX
5802
CALL
DELISTED
SecureWorks Corp Class A Common Stock
SCWX
| $132K | ﹤0.01% |
8,300
+7,600
| +1,086% | +$139K |
|
|
SHLX
5803
PUT
DELISTED
Shell Midstream Partners, L.P.
SHLX
| $132K | ﹤0.01% |
11,500
-46,300
| -80% | -$546K |
|
|
LFC
5804
CALL
DELISTED
China Life Insurance Company Ltd.
LFC
| $132K | ﹤0.01% |
16,100
-76,400
| -83% | -$655K |
|
|
FST
5805
CALL
DELISTED
FAST Acquisition Corp.
FST
| $132K | ﹤0.01% |
13,000
-4,200
| -24% | -$48.8K |
|
5806
Ardmore Shipping
ASC
$692M
| $131K | ﹤0.01% |
38,882
+32,196
| +482% | +$124K |
|
5807
Eastern Bankshares
EBC
$5.38B
| $131K | ﹤0.01% |
+6,528
| New | +$135K |
|
5808
PUT
Extreme Networks
EXTR
$4.18B
| $131K | ﹤0.01% |
8,400
-38,100
| -82% | -$467K |
|
5809
PUT
The Honest Company
HNST
$422M
| $131K | ﹤0.01% |
16,300
+4,200
| +35% | +$36.9K |
|
|
LAND
5810
CALL
Gladstone Land Corp
LAND
$352M
| $131K | ﹤0.01% |
3,900
-3,500
| -47% | -$94.3K |
|
5811
PUT
Liberty Global Class C
LBTYK
$3.58B
| $131K | ﹤0.01% |
4,700
+400
| +9% | +$11.4K |
|
5812
Medallion Financial
MFIN
$247M
| $131K | ﹤0.01% |
22,636
+18,251
| +416% | +$151K |
|
5813
Myriad Genetics
MYGN
$301M
| $131K | ﹤0.01% |
4,782
+2,305
| +93% | +$66.8K |
|
5814
Qualys
QLYS
$5.56B
| $131K | ﹤0.01% |
+956
| New | +$122K |
|
5815
CALL
Hanover Insurance
THG
$7.93B
| $131K | ﹤0.01% |
1,000
| – | – |
|
5816
CALL
Frontier Group Holdings
ULCC
$1.85B
| $131K | ﹤0.01% |
9,700
+9,000
| +1,286% | +$138K |
|
|
ARCE
5817
DELISTED
Arco Platform Limited Class A Common Shares
ARCE
| $131K | ﹤0.01% |
+6,294
| New | +$122K |
|
5818
PUT
ABM Industries
ABM
$2.88B
| $130K | ﹤0.01% |
3,200
-10,900
| -77% | -$492K |
|
5819
CALL
American Resources Corp
AREC
$218M
| $130K | ﹤0.01% |
72,600
+66,400
| +1,071% | +$139K |
|
|
SRTA
5820
PUT
Strata Critical Medical Inc
SRTA
$486M
| $130K | ﹤0.01% |
14,800
-15,900
| -52% | -$151K |
|
|
CARM
5821
CALL
DELISTED
Carisma Therapeutics
CARM
| $130K | ﹤0.01% |
7,990
+1,925
| +32% | +$38.7K |
|
5822
Cue Biopharma
CUE
$113M
| $130K | ﹤0.01% |
385
+138
| +56% | +$53.4K |
|
5823
PUT
Dorchester Minerals
DMLP
$1.24B
| $130K | ﹤0.01% |
6,600
+5,400
| +450% | +$104K |
|
5824
Gran Tierra Energy
GTE
$245M
| $130K | ﹤0.01% |
17,136
+8,280
| +93% | +$67.4K |
|
5825
CALL
Immunic
IMUX
$194M
| $130K | ﹤0.01% |
1,360
+740
| +119% | +$66.6K |
|
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.