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 | |
|---|---|---|---|---|---|---|
|
ABMD
2226
DELISTED
Abiomed Inc
ABMD
| $1.66M | ﹤0.01% |
4,633
+3,988
| +618% | +$1.35M |
|
2227
CALL
Vertiv
VRT
$112B
| $1.66M | ﹤0.01% |
66,500
-59,800
| -47% | -$1.5M |
|
|
VMW
2228
DELISTED
VMware, Inc
VMW
| $1.66M | ﹤0.01% |
+14,331
| New | +$1.88M |
|
2229
PUT
Boyd Gaming
BYD
$6.47B
| $1.66M | ﹤0.01% |
25,300
-900
| -3% | -$57.1K |
|
2230
PUT
Arrowhead Research
ARWR
$12.1B
| $1.66M | ﹤0.01% |
25,000
+9,800
| +64% | +$673K |
|
2231
GSK
GSK
$103B
| $1.66M | ﹤0.01% |
30,066
+28,800
| +2,275% | +$1.5M |
|
|
SC
2232
CALL
DELISTED
SANTANDER CONSUMER USA HOLDINGS INC
SC
| $1.66M | ﹤0.01% |
39,400
+38,200
| +3,183% | +$1.6M |
|
2233
PUT
Reliance Steel & Aluminium
RS
$20.8B
| $1.65M | ﹤0.01% |
10,200
-15,700
| -61% | -$2.43M |
|
2234
CALL
Vipshop
VIPS
$6.84B
| $1.65M | ﹤0.01% |
197,000
-507,400
| -72% | -$5.31M |
|
2235
SentinelOne
S
$6.22B
| $1.65M | ﹤0.01% |
+32,740
| New | +$1.92M |
|
2236
CALL
Denison Mines
DNN
$2.63B
| $1.65M | ﹤0.01% |
1,205,400
+743,500
| +161% | +$1.22M |
|
2237
CALL
Mirion Technologies
MIR
$4.05B
| $1.65M | ﹤0.01% |
157,700
-221,600
| -58% | -$2.38M |
|
|
PR
2238
PUT
Permian Resources
PR
$17.9B
| $1.65M | ﹤0.01% |
276,200
-59,600
| -18% | -$406K |
|
2239
S&P Global
SPGI
$126B
| $1.65M | ﹤0.01% |
3,499
-30,393
| -90% | -$13.9M |
|
|
CTLT
2240
CALL
DELISTED
CATALENT, INC.
CTLT
| $1.65M | ﹤0.01% |
12,900
-13,400
| -51% | -$1.72M |
|
|
OSG
2241
Octave Specialty Group
OSG
$252M
| $1.65M | ﹤0.01% |
102,854
+101,894
| +10,614% | +$1.6M |
|
|
XLNX
2242
PUT
DELISTED
Xilinx Inc
XLNX
| $1.65M | ﹤0.01% |
358,200
+291,900
| +440% | +$57.6M |
|
2243
LyondellBasell Industries
LYB
$19.5B
| $1.65M | ﹤0.01% |
17,868
+9,939
| +125% | +$922K |
|
2244
Zscaler
ZS
$23B
| $1.65M | ﹤0.01% |
5,123
-19,423
| -79% | -$6.12M |
|
|
OTLY
2245
PUT
Oatly Group
OTLY
$417M
| $1.64M | ﹤0.01% |
10,325
+2,665
| +35% | +$589K |
|
|
BBL
2246
DELISTED
BHP Group Plc American Depositary Shares (Each representing two Ordinary Shares)
BBL
| $1.64M | ﹤0.01% |
27,497
+13,096
| +91% | +$714K |
|
|
SUM
2247
CALL
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $1.64M | ﹤0.01% |
41,595
-28,476
| -41% | -$1.04M |
|
|
MNDT
2248
CALL
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $1.64M | ﹤0.01% |
93,600
-172,500
| -65% | -$3.03M |
|
2249
Boeing
BA
$165B
| $1.64M | ﹤0.01% |
8,150
-55,868
| -87% | -$11.8M |
|
2250
Element Solutions
ESI
$9.12B
| $1.64M | ﹤0.01% |
+67,559
| New | +$1.59M |
|
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.