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 | |
|---|---|---|---|---|---|---|
3976
CALL
Green Brick Partners
GRBK
$3.18B
| $445K | ﹤0.01% |
14,700
+14,600
| +14,600% | +$383K |
|
|
MRO
3977
DELISTED
Marathon Oil Corporation
MRO
| $445K | ﹤0.01% |
27,159
-177,704
| -87% | -$2.86M |
|
|
RFP
3978
CALL
DELISTED
Resolute Forest Products Inc.
RFP
| $445K | ﹤0.01% |
29,200
-72,900
| -71% | -$920K |
|
|
DS
3979
PUT
DELISTED
Drive Shack Inc.
DS
| $445K | ﹤0.01% |
311,200
+160,700
| +107% | +$354K |
|
3980
SandRidge Energy
SD
$485M
| $444K | ﹤0.01% |
42,450
+25,865
| +156% | +$307K |
|
3981
Boise Cascade
BCC
$2.83B
| $443K | ﹤0.01% |
6,226
+3,235
| +108% | +$209K |
|
3982
Thor Industries
THO
$4.13B
| $443K | ﹤0.01% |
4,274
-6,303
| -60% | -$684K |
|
|
GATO
3983
CALL
DELISTED
Gatos Silver, Inc.
GATO
| $443K | ﹤0.01% |
42,700
+31,500
| +281% | +$378K |
|
|
KC
3984
CALL
Kingsoft Cloud Holdings
KC
$3.03B
| $441K | ﹤0.01% |
28,000
+3,900
| +16% | +$83.8K |
|
3985
PUT
Sundial Growers
SNDL
$318M
| $441K | ﹤0.01% |
76,420
-52,570
| -41% | -$344K |
|
|
SEV
3986
CALL
DELISTED
Sono Group N.V. Common Shares
SEV
| $441K | ﹤0.01% |
+45,800
| New | +$690K |
|
3987
PUT
OptimizeRx
OPRX
$119M
| $440K | ﹤0.01% |
7,100
+900
| +15% | +$68.2K |
|
3988
PUT
Resources Connection
RGP
$136M
| $440K | ﹤0.01% |
24,700
+22,700
| +1,135% | +$401K |
|
3989
PUT
America Movil
AMX
$77.2B
| $439K | ﹤0.01% |
20,800
+18,800
| +940% | +$346K |
|
|
FPI
3990
CALL
Farmland Partners
FPI
$417M
| $439K | ﹤0.01% |
36,800
+16,200
| +79% | +$193K |
|
3991
Mercury Systems
MRCY
$5.97B
| $439K | ﹤0.01% |
7,987
+7,137
| +840% | +$361K |
|
3992
PUT
Omeros
OMER
$816M
| $439K | ﹤0.01% |
68,400
-83,000
| -55% | -$602K |
|
3993
CALL
Skillsoft
SKIL
$63.8M
| $439K | ﹤0.01% |
2,400
-8,000
| -77% | -$1.84M |
|
3994
CALL
Varonis Systems
VRNS
$5.13B
| $439K | ﹤0.01% |
9,000
+1,600
| +22% | +$91.1K |
|
|
SAFM
3995
CALL
DELISTED
Sanderson Farms Inc
SAFM
| $439K | ﹤0.01% |
2,300
+1,900
| +475% | +$358K |
|
|
DOC
3996
DELISTED
PHYSICIANS REALTY TRUST
DOC
| $439K | ﹤0.01% |
23,322
+19,571
| +522% | +$361K |
|
3997
Valvoline
VVV
$5.13B
| $438K | ﹤0.01% |
+11,772
| New | +$411K |
|
3998
PUT
Caleres
CAL
$447M
| $437K | ﹤0.01% |
19,300
+12,900
| +202% | +$308K |
|
3999
Community Health Systems
CYH
$393M
| $437K | ﹤0.01% |
32,876
+30,718
| +1,423% | +$386K |
|
4000
PUT
Global E Online
GLBE
$6.53B
| $437K | ﹤0.01% |
+6,900
| New | +$416K |
|
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.