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 | |
|---|---|---|---|---|---|---|
|
RAPT
4001
CALL
DELISTED
RAPT Therapeutics
RAPT
| $437K | ﹤0.01% |
1,488
-9,437
| -86% | -$2.52M |
|
4002
CALL
MarineMax
HZO
$758M
| $436K | ﹤0.01% |
7,400
+1,200
| +19% | +$64.2K |
|
|
RENT
4003
PUT
Rent the Runway
RENT
$120M
| $436K | ﹤0.01% |
+2,675
| New | +$713K |
|
4004
CALL
Adient
ADNT
$1.69B
| $435K | ﹤0.01% |
9,100
-59,200
| -87% | -$2.66M |
|
4005
CALL
National Beverage
FIZZ
$3.08B
| $435K | ﹤0.01% |
9,600
-36,000
| -79% | -$1.96M |
|
4006
Genius Sports
GENI
$1.93B
| $435K | ﹤0.01% |
57,277
-14,663
| -20% | -$198K |
|
4007
CALL
Holley
HLLY
$329M
| $435K | ﹤0.01% |
+33,500
| New | +$405K |
|
4008
ProShares UltraShort Bloomberg Natural Gas
KOLD
$118M
| $435K | ﹤0.01% |
+3,598
| New | +$327K |
|
|
NVEI
4009
PUT
DELISTED
Nuvei Corporation Subordinate Voting Shares
NVEI
| $435K | ﹤0.01% |
+6,700
| New | +$660K |
|
4010
Dole
DOLE
$1.37B
| $434K | ﹤0.01% |
+32,594
| New | +$456K |
|
4011
PUT
Aviat Networks
AVNW
$252M
| $433K | ﹤0.01% |
13,500
+7,700
| +133% | +$241K |
|
4012
iPath Bloomberg Commodity Index Total Return ETN due 12 June 2036
DJP
$801M
| $433K | ﹤0.01% |
15,114
+5,327
| +54% | +$156K |
|
|
IRD
4013
CALL
Opus Genetics
IRD
$278M
| $433K | ﹤0.01% |
116,100
+105,300
| +975% | +$422K |
|
|
LSXMK
4014
DELISTED
Liberty Media Corporation Series C Liberty SiriusXM Common Stock
LSXMK
| $433K | ﹤0.01% |
11,016
+2,708
| +33% | +$105K |
|
4015
CONMED
CNMD
$1.32B
| $432K | ﹤0.01% |
3,054
+2,135
| +232% | +$302K |
|
4016
CALL
Republic Services
RSG
$68.3B
| $432K | ﹤0.01% |
3,100
-6,000
| -66% | -$797K |
|
|
SAND
4017
PUT
DELISTED
Sandstorm Gold
SAND
| $432K | ﹤0.01% |
69,700
-36,900
| -35% | -$231K |
|
|
BHIL
4018
CALL
DELISTED
Benson Hill, Inc.
BHIL
| $432K | ﹤0.01% |
+1,694
| New | +$409K |
|
4019
Church & Dwight Co
CHD
$23.6B
| $431K | ﹤0.01% |
4,209
-21,678
| -84% | -$1.97M |
|
4020
CALL
RUM Group Inc
RUM
$1.58B
| $431K | ﹤0.01% |
+39,800
| New | +$421K |
|
4021
CALL
STAG Industrial
STAG
$7.45B
| $431K | ﹤0.01% |
9,000
-78,100
| -90% | -$3.4M |
|
4022
PUT
Algonquin Power & Utilities
AQN
$4.67B
| $430K | ﹤0.01% |
29,800
+24,700
| +484% | +$354K |
|
4023
PUT
Flex
FLEX
$38.1B
| $430K | ﹤0.01% |
31,185
-27,867
| -47% | -$377K |
|
4024
CALL
Harmonic Inc
HLIT
$1.15B
| $430K | ﹤0.01% |
36,600
+33,700
| +1,162% | +$347K |
|
|
GAN
4025
PUT
DELISTED
GAN Ltd
GAN
| $429K | ﹤0.01% |
46,700
+23,700
| +103% | +$290K |
|
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.