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 | |
|---|---|---|---|---|---|---|
|
NSTG
3001
CALL
DELISTED
NanoString Technologies, Inc.
NSTG
| $675K | ﹤0.01% |
166,900
+161,600
| +3,049% | +$1.19M |
|
3002
CALL
LGI Homes
LGIH
$1.4B
| $674K | ﹤0.01% |
5,000
+500
| +11% | +$60K |
|
3003
PUT
Xerox
XRX
$357M
| $674K | ﹤0.01% |
45,300
-31,300
| -41% | -$458K |
|
3004
PUT
Alkami Technology
ALKT
$1.9B
| $673K | ﹤0.01% |
41,100
+3,400
| +9% | +$46.9K |
|
3005
CALL
Amplify Junior Silver Miners ETF
SILJ
$3.29B
| $673K | ﹤0.01% |
55,700
-80,900
| -59% | -$842K |
|
3006
PUT
Red Robin
RRGB
$136M
| $672K | ﹤0.01% |
48,600
+45,400
| +1,419% | +$609K |
|
3007
CALL
Clover Health Investments
CLOV
$2.25B
| $671K | ﹤0.01% |
748,300
+196,200
| +36% | +$174K |
|
3008
PUT
Avery Dennison
AVY
$12.5B
| $670K | ﹤0.01% |
3,900
+3,400
| +680% | +$581K |
|
3009
CALL
Loews
L
$24.4B
| $670K | ﹤0.01% |
11,300
+3,000
| +36% | +$174K |
|
3010
CALL
Navient
NAVI
$809M
| $670K | ﹤0.01% |
36,100
+24,600
| +214% | +$404K |
|
3011
Barclays
BCS
$96.3B
| $669K | ﹤0.01% |
85,175
+75,819
| +810% | +$587K |
|
3012
CALL
Acadia Pharmaceuticals
ACAD
$4.35B
| $668K | ﹤0.01% |
27,900
-300
| -1% | -$6.67K |
|
3013
CALL
Amplify Energy
AMPY
$155M
| $665K | ﹤0.01% |
98,300
+21,700
| +28% | +$151K |
|
3014
Macerich
MAC
$7.41B
| $663K | ﹤0.01% |
+58,886
| New | +$600K |
|
3015
PUT
SandRidge Energy
SD
$496M
| $663K | ﹤0.01% |
43,500
-13,200
| -23% | -$194K |
|
3016
CALL
Teekay
TK
$974M
| $663K | ﹤0.01% |
109,900
-30,800
| -22% | -$180K |
|
3017
PUT
Hartford Financial Services
HIG
$38.4B
| $662K | ﹤0.01% |
9,200
+6,600
| +254% | +$463K |
|
3018
PUT
Noodles & Co
NDLS
$84M
| $661K | ﹤0.01% |
24,450
-13,238
| -35% | -$432K |
|
3019
PUT
IMAX
IMAX
$2.47B
| $660K | ﹤0.01% |
38,900
-2,300
| -6% | -$43.6K |
|
3020
Vuzix
VUZI
$193M
| $660K | ﹤0.01% |
129,575
+79,953
| +161% | +$354K |
|
3021
CALL
Ryan Specialty Holdings
RYAN
$5.59B
| $659K | ﹤0.01% |
14,700
-35,800
| -71% | -$1.51M |
|
|
LKFT
3022
CALL
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.84B
| $658K | ﹤0.01% |
16,200
-45,400
| -74% | -$1.85M |
|
3023
CALL
Rocket Lab Corp
RKLB
$41.8B
| $658K | ﹤0.01% |
109,700
-88,300
| -45% | -$405K |
|
|
SBDS
3024
PUT
DELISTED
Solo Brands Inc
SBDS
| $658K | ﹤0.01% |
2,908
-75
| -3% | -$18.6K |
|
3025
Huntington Bancshares
HBAN
$34.7B
| $657K | ﹤0.01% |
+60,986
| New | +$652K |
|
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.