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 | |
|---|---|---|---|---|---|---|
5651
ProShares UltraPro MidCap400
UMDD
$32.8M
| $145K | ﹤0.01% |
+4,148
| New | +$140K |
|
5652
PUT
Viking Therapeutics
VKTX
$3.8B
| $145K | ﹤0.01% |
31,600
-8,900
| -22% | -$49.9K |
|
|
WSR
5653
PUT
DELISTED
Whitestone REIT
WSR
| $145K | ﹤0.01% |
14,400
+10,500
| +269% | +$102K |
|
|
SEI
5654
Solaris Energy Infrastructure
SEI
$3.4B
| $145K | ﹤0.01% |
22,226
+10,814
| +95% | +$80.2K |
|
|
TACO
5655
DELISTED
Del Taco Restaurants, Inc. Common Stock
TACO
| $145K | ﹤0.01% |
11,660
-2,116
| -15% | -$20.4K |
|
|
RJET
5656
Republic Airways Holdings
RJET
$990M
| $144K | ﹤0.01% |
1,720
+1,150
| +202% | +$125K |
|
5657
CALL
Nkarta
NKTX
$154M
| $144K | ﹤0.01% |
9,400
+9,000
| +2,250% | +$154K |
|
5658
CALL
O-I Glass
OI
$1.14B
| $144K | ﹤0.01% |
12,000
-15,900
| -57% | -$202K |
|
5659
CALL
Viavi Solutions
VIAV
$9.31B
| $144K | ﹤0.01% |
8,200
+4,600
| +128% | +$72.9K |
|
|
VRNA
5660
PUT
DELISTED
Verona Pharma
VRNA
| $144K | ﹤0.01% |
21,500
+16,000
| +291% | +$81.7K |
|
|
ZGNX
5661
CALL
DELISTED
Zogenix, Inc.
ZGNX
| $144K | ﹤0.01% |
8,900
-51,300
| -85% | -$752K |
|
|
5662
Advanced Micro Devices
AMD
$790B
| $143K | ﹤0.01% |
1,000
-214,308
| -100% | -$28.8M |
|
5663
PUT
American Resources Corp
AREC
$217M
| $143K | ﹤0.01% |
79,700
-76,100
| -49% | -$159K |
|
5664
CALL
Central Pacific Financial
CPF
$1.02B
| $143K | ﹤0.01% |
5,100
+3,100
| +155% | +$84.8K |
|
5665
CALL
MiMedx Group
MDXG
$622M
| $143K | ﹤0.01% |
23,800
-10,000
| -30% | -$69.4K |
|
5666
Methode Electronics
MEI
$499M
| $143K | ﹤0.01% |
2,910
+1,094
| +60% | +$49.2K |
|
5667
CALL
Regency Centers
REG
$14.7B
| $143K | ﹤0.01% |
1,900
-14,500
| -88% | -$1.05M |
|
5668
Sensata Technologies
ST
$6.81B
| $143K | ﹤0.01% |
2,322
-847
| -27% | -$49.3K |
|
5669
PUT
Taboola.com
TBLA
$1.42B
| $143K | ﹤0.01% |
18,400
-27,700
| -60% | -$238K |
|
5670
PUT
West Fraser Timber
WFG
$5.2B
| $143K | ﹤0.01% |
1,500
+600
| +67% | +$51.9K |
|
5671
CALL
Wrap Technologies
WRAP
$106M
| $143K | ﹤0.01% |
36,500
-32,100
| -47% | -$169K |
|
|
SRCL
5672
CALL
DELISTED
Stericycle Inc
SRCL
| $143K | ﹤0.01% |
2,400
+2,200
| +1,100% | +$138K |
|
|
MMAT
5673
PUT
DELISTED
Meta Materials Inc. Common Stock
MMAT
| $143K | ﹤0.01% |
647
-1,924
| -75% | -$793K |
|
|
LTHM
5674
PUT
DELISTED
Livent Corporation
LTHM
| $143K | ﹤0.01% |
5,900
-4,800
| -45% | -$130K |
|
|
SEV
5675
PUT
DELISTED
Sono Group N.V. Common Shares
SEV
| $143K | ﹤0.01% |
+14,900
| New | +$224K |
|
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.