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 | |
|---|---|---|---|---|---|---|
|
SRG
4051
CALL
Seritage Growth Properties
SRG
$137M
| $421K | ﹤0.01% |
31,800
-83,800
| -72% | -$1.23M |
|
4052
CALL
Alamos Gold
AGI
$11.9B
| $420K | ﹤0.01% |
54,700
-167,700
| -75% | -$1.3M |
|
|
ARCH
4053
CALL
DELISTED
Arch Resources, Inc.
ARCH
| $420K | ﹤0.01% |
4,600
+800
| +21% | +$71K |
|
4054
CALL
Lufax Holding
LU
$1.33B
| $419K | ﹤0.01% |
18,650
-71,475
| -79% | -$1.87M |
|
4055
PUT
Brookfield Renewable
BEP
$9.54B
| $418K | ﹤0.01% |
11,700
+2,900
| +33% | +$107K |
|
4056
CALL
Compass Diversified
CODI
$757M
| $418K | ﹤0.01% |
13,700
-8,900
| -39% | -$270K |
|
4057
Designer Brands
DBI
$311M
| $418K | ﹤0.01% |
29,433
+21,403
| +267% | +$306K |
|
4058
Denali Therapeutics
DNLI
$3.77B
| $418K | ﹤0.01% |
+9,376
| New | +$444K |
|
4059
Nautilus Biotechnolgy
NAUT
$144M
| $418K | ﹤0.01% |
80,731
+78,291
| +3,209% | +$419K |
|
4060
Tower Semiconductor
TSEM
$21.2B
| $418K | ﹤0.01% |
10,545
-63,104
| -86% | -$2.19M |
|
|
RAD
4061
DELISTED
Rite Aid Corporation
RAD
| $418K | ﹤0.01% |
28,472
-22,684
| -44% | -$306K |
|
|
DOC
4062
PUT
DELISTED
PHYSICIANS REALTY TRUST
DOC
| $418K | ﹤0.01% |
22,200
-20,600
| -48% | -$380K |
|
4063
CALL
Marten Transport
MRTN
$1.22B
| $416K | ﹤0.01% |
+24,300
| New | +$402K |
|
4064
Clear Secure
YOU
$5.75B
| $416K | ﹤0.01% |
+13,289
| New | +$491K |
|
|
MAXR
4065
PUT
DELISTED
Maxar Technologies Inc. Common Stock
MAXR
| $416K | ﹤0.01% |
14,100
-8,000
| -36% | -$232K |
|
|
ELMS
4066
CALL
DELISTED
Electric Last Mile Solutions, Inc. Class A Common stock
ELMS
| $416K | ﹤0.01% |
59,300
-68,300
| -54% | -$518K |
|
4067
CALL
Fulcrum Therapeutics
FULC
$245M
| $415K | ﹤0.01% |
+23,500
| New | +$466K |
|
4068
PUT
Vermilion Energy
VET
$1.65B
| $415K | ﹤0.01% |
33,000
-26,300
| -44% | -$286K |
|
4069
PUT
WD-40
WDFC
$2.99B
| $415K | ﹤0.01% |
1,700
-2,200
| -56% | -$512K |
|
|
CNR
4070
PUT
Core Natural Resources Inc
CNR
$3.95B
| $415K | ﹤0.01% |
18,300
-51,000
| -74% | -$1.32M |
|
|
ARC
4071
CALL
DELISTED
ARC Document Solutions, Inc.
ARC
| $415K | ﹤0.01% |
118,800
+112,400
| +1,756% | +$338K |
|
|
AVDX
4072
CALL
DELISTED
AvidXchange
AVDX
| $414K | ﹤0.01% |
+27,500
| New | +$574K |
|
4073
PUT
MACOM Technology Solutions
MTSI
$17.5B
| $414K | ﹤0.01% |
5,300
-8,800
| -62% | -$635K |
|
4074
ProShares Ultra Silver
AGQ
$1.12B
| $413K | ﹤0.01% |
11,897
-2,286
| -16% | -$80.9K |
|
4075
CALL
Intellia Therapeutics
NTLA
$1.5B
| $413K | ﹤0.01% |
3,500
-55,900
| -94% | -$7M |
|
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.