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 | |
|---|---|---|---|---|---|---|
|
CTXS
651
PUT
DELISTED
Citrix Systems Inc
CTXS
| $13.7M | 0.01% |
145,200
+89,000
| +158% | +$8.13M |
|
652
CALL
Dollar Tree
DLTR
$22.6B
| $13.7M | 0.01% |
97,600
-26,400
| -21% | -$3.21M |
|
|
COUP
653
CALL
DELISTED
Coupa Software Incorporated
COUP
| $13.7M | 0.01% |
86,700
-19,200
| -18% | -$3.95M |
|
654
CALL
Western Digital
WDC
$192B
| $13.7M | 0.01% |
277,830
-824,494
| -75% | -$35.8M |
|
655
CALL
Teck Resources
TECK
$29.3B
| $13.6M | 0.01% |
473,400
+231,600
| +96% | +$6.35M |
|
656
CALL
Paychex
PAYX
$39.4B
| $13.6M | 0.01% |
99,800
+21,200
| +27% | +$2.62M |
|
657
PUT
Constellation Brands
STZ
$22.1B
| $13.6M | 0.01% |
54,000
-123,700
| -70% | -$28.2M |
|
658
PUT
Linde
LIN
$234B
| $13.5M | 0.01% |
39,000
+16,500
| +73% | +$5.35M |
|
659
PUT
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.14B
| $13.5M | 0.01% |
120,500
+78,500
| +187% | +$6.09M |
|
660
AstraZeneca
AZN
$261B
| $13.5M | 0.01% |
+115,598
| New | +$13.6M |
|
661
CALL
Take-Two Interactive
TTWO
$42.7B
| $13.5M | 0.01% |
75,700
+41,100
| +119% | +$7.16M |
|
662
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$107M
| $13.4M | 0.01% |
341,300
+18,400
| +6% | +$499K |
|
663
PUT
Akamai
AKAM
$17.1B
| $13.3M | 0.01% |
114,000
+27,700
| +32% | +$3.05M |
|
664
PUT
NXP Semiconductors
NXPI
$70B
| $13.3M | 0.01% |
58,500
+4,200
| +8% | +$893K |
|
|
WBA
665
DELISTED
Walgreens Boots Alliance
WBA
| $13.3M | 0.01% |
255,353
+92,093
| +56% | +$4.46M |
|
666
PUT
US Bancorp Series B Preferred Stock
USB.PRH
$744M
| $13.3M | 0.01% |
236,900
-42,300
| -15% | -$1.03M |
|
667
PUT
EOG Resources
EOG
$77.5B
| $13.3M | 0.01% |
149,200
+64,200
| +76% | +$5.77M |
|
668
CALL
Cboe Global Markets
CBOE
$29.8B
| $13.2M | 0.01% |
101,200
+52,400
| +107% | +$6.76M |
|
669
PUT
Bunge Global
BG
$23.7B
| $13.2M | 0.01% |
141,000
+52,400
| +59% | +$4.68M |
|
|
NBIS
670
CALL
Nebius Group N.V.
NBIS
$56.1B
| $13.2M | 0.01% |
217,500
+68,600
| +46% | +$5.05M |
|
671
Upstart Holdings
UPST
$2.64B
| $13.1M | 0.01% |
86,851
+5,889
| +7% | +$1.47M |
|
672
PUT
Rio Tinto
RIO
$149B
| $13.1M | 0.01% |
196,100
-15,400
| -7% | -$997K |
|
673
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$246M
| $13.1M | 0.01% |
280,500
+1,800
| +0.6% | +$90.2K |
|
674
General Motors
GM
$73B
| $13M | 0.01% |
221,760
+185,164
| +506% | +$10.8M |
|
675
CALL
DexCom
DXCM
$27.2B
| $13M | 0.01% |
96,800
-14,800
| -13% | -$2.13M |
|
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.