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 | |
|---|---|---|---|---|---|---|
|
NARI
3651
CALL
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $556K | ﹤0.01% |
6,100
+4,600
| +307% | +$394K |
|
|
DAY
3652
CALL
DELISTED
Dayforce
DAY
| $553K | ﹤0.01% |
5,300
+4,400
| +489% | +$505K |
|
3653
EyePoint Inc
EYPT
$1B
| $551K | ﹤0.01% |
45,096
+7,619
| +20% | +$103K |
|
3654
CALL
St. Joe Company
JOE
$3.57B
| $551K | ﹤0.01% |
10,600
-8,300
| -44% | -$402K |
|
|
SEGG
3655
CALL
Sports Entertainment Gaming Global Corp
SEGG
$13.3M
| $551K | ﹤0.01% |
+433
| New | +$848K |
|
|
MRC
3656
PUT
DELISTED
MRC Global
MRC
| $551K | ﹤0.01% |
+80,100
| New | +$627K |
|
3657
PUT
Navitas Semiconductor
NVTS
$2.44B
| $551K | ﹤0.01% |
+32,400
| New | +$485K |
|
3658
PUT
Silicon Motion
SIMO
$7.51B
| $551K | ﹤0.01% |
5,800
-51,800
| -90% | -$3.9M |
|
|
QLTB
3659
PUT
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $551K | ﹤0.01% |
5,800
+4,300
| +287% | +$409K |
|
3660
CALL
Evolent Health
EVH
$421M
| $550K | ﹤0.01% |
19,900
+9,400
| +90% | +$270K |
|
3661
CALL
ImmunityBio
IBRX
$7.3B
| $549K | ﹤0.01% |
90,400
+64,700
| +252% | +$486K |
|
3662
CALL
Progyny
PGNY
$2.41B
| $548K | ﹤0.01% |
10,900
-45,600
| -81% | -$2.55M |
|
3663
CVR Partners
UAN
$1.29B
| $548K | ﹤0.01% |
6,636
-6,603
| -50% | -$524K |
|
|
XIFR
3664
PUT
XPLR Infrastructure LP
XIFR
$1.11B
| $548K | ﹤0.01% |
6,500
-11,700
| -64% | -$979K |
|
|
ARI
3665
CALL
Apollo Commercial Real Estate
ARI
$881M
| $547K | ﹤0.01% |
41,600
+2,700
| +7% | +$39K |
|
3666
Energy Fuels
UUUU
$2.83B
| $547K | ﹤0.01% |
71,691
+30,592
| +74% | +$259K |
|
3667
CALL
Group 1 Automotive
GPI
$4.17B
| $546K | ﹤0.01% |
2,800
+1,900
| +211% | +$369K |
|
3668
Lamar Advertising Co
LAMR
$16.5B
| $546K | ﹤0.01% |
+4,509
| New | +$525K |
|
|
QLTB
3669
CALL
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $546K | ﹤0.01% |
6,400
+500
| +8% | +$42.7K |
|
3670
Curis
CRIS
$9.41M
| $545K | ﹤0.01% |
287
+162
| +130% | +$385K |
|
3671
PUT
Krystal Biotech
KRYS
$10.7B
| $545K | ﹤0.01% |
7,800
-23,700
| -75% | -$1.38M |
|
|
EXPR
3672
CALL
DELISTED
Express, Inc.
EXPR
| $545K | ﹤0.01% |
8,850
-7,430
| -46% | -$584K |
|
3673
CALL
Extra Space Storage
EXR
$32.2B
| $544K | ﹤0.01% |
2,400
-1,000
| -29% | -$198K |
|
3674
CALL
MasTec
MTZ
$24.7B
| $544K | ﹤0.01% |
5,900
-23,900
| -80% | -$2.18M |
|
3675
CALL
Perrigo
PRGO
$1.43B
| $544K | ﹤0.01% |
14,000
-8,800
| -39% | -$370K |
|
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.