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 | |
|---|---|---|---|---|---|---|
8176
BJ's Restaurants
BJRI
$1.47B
| $23K | ﹤0.01% |
+682
| New | +$24.3K |
|
8177
CALL
Clear Channel Outdoor Holdings
CCO
$1.22B
| $23K | ﹤0.01% |
7,100
+3,600
| +103% | +$11.2K |
|
8178
PUT
Cognex
CGNX
$9.62B
| $23K | ﹤0.01% |
300
-97,300
| -100% | -$7.85M |
|
8179
PUT
Conduent
CNDT
$253M
| $23K | ﹤0.01% |
4,400
-10,500
| -70% | -$62.7K |
|
8180
CALL
CytomX Therapeutics
CTMX
$690M
| $23K | ﹤0.01% |
5,500
+4,900
| +817% | +$28.7K |
|
8181
PUT
Ducommun
DCO
$2.56B
| $23K | ﹤0.01% |
+500
| New | +$23.9K |
|
8182
DiaMedica Therapeutics
DMAC
$341M
| $23K | ﹤0.01% |
6,350
-9,991
| -61% | -$39.2K |
|
8183
PUT
Vaalco Energy
EGY
$562M
| $23K | ﹤0.01% |
7,400
-22,600
| -75% | -$75K |
|
8184
CALL
Genmab
GMAB
$17.5B
| $23K | ﹤0.01% |
600
-1,900
| -76% | -$79.2K |
|
|
8185
PUT
Genmab
GMAB
$17.5B
| $23K | ﹤0.01% |
+600
| New | +$25K |
|
|
GOCO
8186
PUT
DELISTED
GoHealth
GOCO
| $23K | ﹤0.01% |
420
-1,533
| -78% | -$102K |
|
|
GRFS
8187
CALL
Grifois
GRFS
$5.55B
| $23K | ﹤0.01% |
2,100
-400
| -16% | -$4.91K |
|
8188
CALL
Great Southern Bancorp
GSBC
$878M
| $23K | ﹤0.01% |
+400
| New | +$23K |
|
8189
CALL
ICU Medical
ICUI
$4.16B
| $23K | ﹤0.01% |
100
| – | – |
|
|
8190
PUT
ICU Medical
ICUI
$4.16B
| $23K | ﹤0.01% |
100
-200
| -67% | -$46.7K |
|
8191
INmune Bio
INMB
$44.9M
| $23K | ﹤0.01% |
2,310
-5,056
| -69% | -$74.9K |
|
8192
iShares Core S&P Total US Stock Market ETF
ITOT
$92.3B
| $23K | ﹤0.01% |
218
+198
| +990% | +$20.7K |
|
8193
Korro Bio
KRRO
$145M
| $23K | ﹤0.01% |
+91
| New | +$27.7K |
|
8194
CALL
Quaker Houghton
KWR
$2.58B
| $23K | ﹤0.01% |
100
| – | – |
|
8195
PUT
MediWound
MDWD
$184M
| $23K | ﹤0.01% |
+1,429
| New | +$29.7K |
|
8196
NanoViricides
NNVC
$39.3M
| $23K | ﹤0.01% |
+6,287
| New | +$28.6K |
|
8197
NWPX Infrastructure Inc
NWPX
$1.19B
| $23K | ﹤0.01% |
+737
| New | +$20.3K |
|
8198
iShares S&P 100 ETF
OEF
$19.5B
| $23K | ﹤0.01% |
+108
| New | +$22.9K |
|
8199
PUT
OFS Capital
OFS
$46.2M
| $23K | ﹤0.01% |
+2,200
| New | +$24.2K |
|
|
OPRA
8200
PUT
Opera Ltd
OPRA
$1.68B
| $23K | ﹤0.01% |
3,300
-500
| -13% | -$4.08K |
|
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.