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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
SBOW
3326
DELISTED
SilverBow Resources, Inc.
SBOW
| $499K | ﹤0.01% |
17,148
-30,205
| -64% | -$747K |
|
3327
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.32B
| $497K | ﹤0.01% |
10,815
-22,080
| -67% | -$1.01M |
|
|
KC
3328
CALL
Kingsoft Cloud Holdings
KC
$2.97B
| $497K | ﹤0.01% |
81,500
+21,100
| +35% | +$126K |
|
3329
Ovintiv
OVV
$16.6B
| $497K | ﹤0.01% |
13,081
-48,502
| -79% | -$1.75M |
|
3330
PUT
VeriSign
VRSN
$24.8B
| $497K | ﹤0.01% |
2,200
-11,500
| -84% | -$2.54M |
|
3331
PUT
BCE
BCE
$19.8B
| $496K | ﹤0.01% |
10,900
+2,300
| +27% | +$107K |
|
3332
Haleon
HLN
$43.8B
| $496K | ﹤0.01% |
59,275
-15,732
| -21% | -$134K |
|
|
CD
3333
DELISTED
Chindata Group Holdings Limited American Depositary Shares
CD
| $496K | ﹤0.01% |
69,409
+61,533
| +781% | +$393K |
|
3334
PUT
Cal-Maine
CALM
$4.2B
| $495K | ﹤0.01% |
11,000
-8,800
| -44% | -$437K |
|
3335
CALL
SiTime
SITM
$15.7B
| $495K | ﹤0.01% |
4,200
-500
| -11% | -$54.5K |
|
3336
Schrodinger
SDGR
$1.14B
| $494K | ﹤0.01% |
+9,899
| New | +$334K |
|
3337
Allegro MicroSystems
ALGM
$8.72B
| $493K | ﹤0.01% |
+10,933
| New | +$443K |
|
3338
LivaNova
LIVN
$4.43B
| $492K | ﹤0.01% |
9,580
+8,089
| +543% | +$380K |
|
3339
Concentrix
CNXC
$1.5B
| $489K | ﹤0.01% |
6,059
-12,638
| -68% | -$1.18M |
|
3340
CALL
GXO Logistics
GXO
$6.13B
| $489K | ﹤0.01% |
7,800
-19,900
| -72% | -$1.12M |
|
3341
CALL
Kodak
KODK
$788M
| $489K | ﹤0.01% |
105,900
+52,700
| +99% | +$222K |
|
3342
PUT
Medifast
MED
$110M
| $488K | ﹤0.01% |
5,300
-8,700
| -62% | -$775K |
|
3343
PUT
CVB Financial
CVBF
$3.97B
| $487K | ﹤0.01% |
+36,700
| New | +$506K |
|
3344
Microvision
MVIS
$88.8M
| $487K | ﹤0.01% |
+106,416
| New | +$372K |
|
3345
PUT
Tidewater
TDW
$3.91B
| $487K | ﹤0.01% |
8,800
-300
| -3% | -$13.7K |
|
3346
CALL
Workiva
WK
$3.13B
| $487K | ﹤0.01% |
4,800
+2,200
| +85% | +$212K |
|
3347
AerSale
ASLE
$307M
| $486K | ﹤0.01% |
33,087
+32,027
| +3,021% | +$514K |
|
3348
Ginkgo Bioworks
DNA
$487M
| $486K | ﹤0.01% |
6,535
+6,442
| +6,927% | +$381K |
|
|
CIM
3349
CALL
Chimera Investment
CIM
$1.05B
| $484K | ﹤0.01% |
27,967
+9,967
| +55% | +$159K |
|
|
SYNH
3350
PUT
DELISTED
Syneos Health, Inc. Class A Common Stock
SYNH
| $484K | ﹤0.01% |
11,500
+7,000
| +156% | +$283K |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.