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 | |
|---|---|---|---|---|---|---|
5001
PUT
Steven Madden
SHOO
$3.17B
| $107K | ﹤0.01% |
3,300
-4,000
| -55% | -$133K |
|
|
STR
5002
CALL
DELISTED
Sitio Royalties
STR
| $107K | ﹤0.01% |
4,100
+500
| +14% | +$12.8K |
|
5003
CALL
W&T Offshore
WTI
$525M
| $107K | ﹤0.01% |
27,900
-25,600
| -48% | -$110K |
|
5004
CALL
Astrana Health
ASTH
$1.81B
| $107K | ﹤0.01% |
3,400
+2,300
| +209% | +$78.9K |
|
|
VGR
5005
DELISTED
Vector Group Ltd.
VGR
| $107K | ﹤0.01% |
8,376
+4,904
| +141% | +$60.5K |
|
|
OLK
5006
DELISTED
Olink Holding AB (publ) American Depositary Shares
OLK
| $107K | ﹤0.01% |
+5,752
| New | +$119K |
|
|
SIEN
5007
DELISTED
Sientra, Inc.
SIEN
| $107K | ﹤0.01% |
36,681
+22,074
| +151% | +$39.3K |
|
5008
CALL
Actinium Pharmaceuticals
ATNM
$26.3M
| $106K | ﹤0.01% |
14,400
+9,400
| +188% | +$80K |
|
|
BLD
5009
PUT
DELISTED
TopBuild
BLD
| $106K | ﹤0.01% |
400
-600
| -60% | -$132K |
|
5010
Cal-Maine
CALM
$4.43B
| $106K | ﹤0.01% |
2,363
-4,316
| -65% | -$214K |
|
5011
PUT
Encore Capital Group
ECPG
$2.01B
| $106K | ﹤0.01% |
2,200
+800
| +57% | +$38.9K |
|
5012
Frontdoor
FTDR
$5.27B
| $106K | ﹤0.01% |
+3,348
| New | +$99.7K |
|
5013
Grocery Outlet
GO
$904M
| $106K | ﹤0.01% |
+3,468
| New | +$101K |
|
5014
PUT
Voyager Therapeutics
VYGR
$181M
| $106K | ﹤0.01% |
9,300
-24,000
| -72% | -$248K |
|
5015
PUT
Werner Enterprises
WERN
$2.2B
| $106K | ﹤0.01% |
2,400
+1,800
| +300% | +$80.9K |
|
|
ATYR
5016
CALL
aTyr Pharma
ATYR
$47.4M
| $106K | ﹤0.01% |
49,500
+46,000
| +1,314% | +$100K |
|
|
PDCO
5017
DELISTED
Patterson Companies, Inc.
PDCO
| $106K | ﹤0.01% |
3,210
+1,224
| +62% | +$33.7K |
|
|
LL
5018
DELISTED
LL Flooring Holdings, Inc.
LL
| $106K | ﹤0.01% |
27,759
+17,723
| +177% | +$68.5K |
|
|
BVH
5019
CALL
DELISTED
Bluegreen Vacations Holding Corporation
BVH
| $106K | ﹤0.01% |
+3,000
| New | +$90.2K |
|
5020
Beam Global
BEEM
$21.7M
| $105K | ﹤0.01% |
10,205
-4,001
| -28% | -$43.8K |
|
5021
PUT
Dynagas LNG Partners
DLNG
$130M
| $105K | ﹤0.01% |
42,200
-5,600
| -12% | -$14.7K |
|
5022
Denison Mines
DNN
$2.43B
| $105K | ﹤0.01% |
84,762
-19,135
| -18% | -$21.3K |
|
5023
CALL
CGI
GIB
$15.4B
| $105K | ﹤0.01% |
1,000
-2,100
| -68% | -$214K |
|
5024
CALL
Liberty Energy
LBRT
$2.79B
| $105K | ﹤0.01% |
7,900
-120,100
| -94% | -$1.56M |
|
5025
Perma-Fix Environmental Services
PESI
$337M
| $105K | ﹤0.01% |
9,573
-11,673
| -55% | -$122K |
|
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.