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 | |
|---|---|---|---|---|---|---|
7976
PUT
Dycom Industries
DY
$12.1B
| $28K | ﹤0.01% |
300
-2,200
| -88% | -$186K |
|
7977
Erie Indemnity
ERIE
$12.9B
| $28K | ﹤0.01% |
+147
| New | +$29.5K |
|
7978
CALL
Flotek Industries
FTK
$837M
| $28K | ﹤0.01% |
4,267
+217
| +5% | +$1.23K |
|
7979
PUT
Harvard Bioscience
HBIO
$27.5M
| $28K | ﹤0.01% |
410
+190
| +86% | +$13.5K |
|
7980
Hamilton Lane
HLNE
$4.92B
| $28K | ﹤0.01% |
+271
| New | +$27.8K |
|
7981
Herc Holdings
HRI
$4.84B
| $28K | ﹤0.01% |
185
-3,953
| -96% | -$698K |
|
7982
PUT
Ingredion
INGR
$6.26B
| $28K | ﹤0.01% |
300
-8,100
| -96% | -$779K |
|
7983
CALL
Lantheus
LNTH
$6.49B
| $28K | ﹤0.01% |
1,000
-9,300
| -90% | -$247K |
|
7984
CALL
908 Devices
MASS
$314M
| $28K | ﹤0.01% |
+1,100
| New | +$32.4K |
|
7985
Magnolia Oil & Gas
MGY
$5.99B
| $28K | ﹤0.01% |
1,522
-18,911
| -93% | -$375K |
|
7986
Neonode
NEON
$13.4M
| $28K | ﹤0.01% |
+3,213
| New | +$30.3K |
|
|
NOAH
7987
Noah Holdings
NOAH
$584M
| $28K | ﹤0.01% |
935
-37,118
| -98% | -$1.4M |
|
7988
PUT
Ouster
OUST
$2.43B
| $28K | ﹤0.01% |
550
-750
| -58% | -$48.7K |
|
7989
PUT
PDF Solutions
PDFS
$1.96B
| $28K | ﹤0.01% |
+900
| New | +$25K |
|
|
PDS
7990
CALL
Precision Drilling
PDS
$998M
| $28K | ﹤0.01% |
800
-18,200
| -96% | -$712K |
|
|
PINC
7991
CALL
DELISTED
Premier
PINC
| $28K | ﹤0.01% |
700
-8,700
| -93% | -$343K |
|
7992
CALL
FreightCar America
RAIL
$261M
| $28K | ﹤0.01% |
7,800
-2,300
| -23% | -$9.63K |
|
7993
PUT
Cartesian Therapeutics
RNAC
$219M
| $28K | ﹤0.01% |
290
-27
| -9% | -$2.9K |
|
7994
RenaissanceRe
RNR
$13.2B
| $28K | ﹤0.01% |
+171
| New | +$26.8K |
|
7995
CALL
Ryan Specialty Holdings
RYAN
$6.14B
| $28K | ﹤0.01% |
+700
| New | +$26.5K |
|
|
SA
7996
Seabridge Gold
SA
$2.77B
| $28K | ﹤0.01% |
1,728
-3,098
| -64% | -$55.4K |
|
7997
PUT
Sabesp
SBS
$19.2B
| $28K | ﹤0.01% |
20,110
-144,899
| -88% | -$188K |
|
|
SIFY
7998
CALL
Sify Technologies
SIFY
$1.06B
| $28K | ﹤0.01% |
1,467
-7,716
| -84% | -$157K |
|
7999
Soluna Holdings
SLNH
$200M
| $28K | ﹤0.01% |
+108
| New | +$31.5K |
|
8000
CALL
Simulations Plus
SLP
$371M
| $28K | ﹤0.01% |
600
+500
| +500% | +$23.6K |
|
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.