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 | |
|---|---|---|---|---|---|---|
|
PRTY
3301
CALL
DELISTED
Party City Holdco Inc.
PRTY
| $733K | ﹤0.01% |
131,700
-126,700
| -49% | -$839K |
|
|
BRG
3302
PUT
DELISTED
Bluerock Residential Growth REIT, Inc.
BRG
| $733K | ﹤0.01% |
27,800
+15,300
| +122% | +$243K |
|
|
RDS.A
3303
CALL
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $732K | ﹤0.01% |
604,300
-70,300
| -10% | -$3.17M |
|
3304
CALL
Brown & Brown
BRO
$23.6B
| $730K | ﹤0.01% |
+10,400
| New | +$671K |
|
3305
PUT
Guardant Health
GH
$19.3B
| $730K | ﹤0.01% |
7,300
+4,800
| +192% | +$496K |
|
3306
Liberty Global Class C
LBTYK
$3.27B
| $730K | ﹤0.01% |
26,016
-1,376
| -5% | -$39.3K |
|
3307
Synaptics
SYNA
$4.55B
| $730K | ﹤0.01% |
2,522
-1,107
| -31% | -$264K |
|
|
PPL
3308
PPL Corp
PPL
$27.1B
| $729K | ﹤0.01% |
24,260
-593
| -2% | -$17.1K |
|
3309
Azenta
AZTA
$1.27B
| $728K | ﹤0.01% |
+7,063
| New | +$766K |
|
3310
CALL
Knowles
KN
$3.2B
| $728K | ﹤0.01% |
31,200
-400
| -1% | -$8.44K |
|
3311
PUT
RLJ Lodging Trust
RLJ
$1.9B
| $728K | ﹤0.01% |
+52,300
| New | +$735K |
|
3312
CALL
TMC The Metals Company
TMC
$1.64B
| $728K | ﹤0.01% |
+350,300
| New | +$1.06M |
|
3313
CALL
Guidewire Software
GWRE
$12.4B
| $726K | ﹤0.01% |
6,400
-5,200
| -45% | -$617K |
|
|
DFTX
3314
CALL
Definium Therapeutics
DFTX
$5.66B
| $726K | ﹤0.01% |
35,113
+27,113
| +339% | +$865K |
|
3315
Simmons First National
SFNC
$3.32B
| $725K | ﹤0.01% |
+24,524
| New | +$745K |
|
3316
CALL
Idexx Laboratories
IDXX
$43.9B
| $724K | ﹤0.01% |
1,100
-2,200
| -67% | -$1.38M |
|
3317
PUT
Protolabs
PRLB
$1.85B
| $724K | ﹤0.01% |
14,100
-9,400
| -40% | -$555K |
|
3318
CALL
Blink Charging
BLNK
$79.5M
| $723K | ﹤0.01% |
27,300
-62,100
| -69% | -$2M |
|
3319
Southwest Airlines
LUV
$22.2B
| $723K | ﹤0.01% |
16,880
-108,081
| -86% | -$5.07M |
|
3320
Universal Display
OLED
$3.81B
| $723K | ﹤0.01% |
+4,387
| New | +$723K |
|
3321
CALL
Revvity
RVTY
$12.1B
| $723K | ﹤0.01% |
3,600
-4,200
| -54% | -$759K |
|
|
TRVG
3322
PUT
trivago
TRVG
$382M
| $723K | ﹤0.01% |
66,380
+17,260
| +35% | +$208K |
|
|
ELMS
3323
DELISTED
Electric Last Mile Solutions, Inc. Class A Common stock
ELMS
| $722K | ﹤0.01% |
102,843
+65,045
| +172% | +$493K |
|
3324
CALL
Genesis Energy
GEL
$1.81B
| $720K | ﹤0.01% |
67,300
+20,900
| +45% | +$233K |
|
3325
CALL
Root
ROOT
$944M
| $720K | ﹤0.01% |
12,917
-5,677
| -31% | -$444K |
|
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.