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 | |
|---|---|---|---|---|---|---|
4776
CALL
Fresenius Medical Care
FMS
$13.4B
| $129K | ﹤0.01% |
5,400
-800
| -13% | -$18.3K |
|
4777
Golar LNG
GLNG
$4.82B
| $129K | ﹤0.01% |
6,441
-495
| -7% | -$10.6K |
|
4778
CALL
Global Net Lease
GNL
$1.87B
| $129K | ﹤0.01% |
12,600
-36,900
| -75% | -$397K |
|
4779
GSI Technology
GSIT
$201M
| $129K | ﹤0.01% |
23,364
+23,321
| +54,235% | +$101K |
|
4780
PUT
Itron
ITRI
$4.48B
| $129K | ﹤0.01% |
1,800
-500
| -22% | -$31.6K |
|
4781
CALL
InvenTrust Properties
IVT
$2.79B
| $129K | ﹤0.01% |
5,600
+4,800
| +600% | +$108K |
|
4782
CALL
Telos
TLS
$331M
| $129K | ﹤0.01% |
50,400
-64,000
| -56% | -$152K |
|
4783
Global X Artificial Intelligence & Technology ETF
AIQ
$8.89B
| $128K | ﹤0.01% |
4,584
+4,523
| +7,415% | +$114K |
|
|
CPRX
4784
DELISTED
Catalyst Pharmaceutical
CPRX
| $128K | ﹤0.01% |
+9,570
| New | +$138K |
|
4785
PUT
Carlisle Companies
CSL
$13.5B
| $128K | ﹤0.01% |
500
+200
| +67% | +$44.3K |
|
|
DADA
4786
DELISTED
Dada Nexus
DADA
| $128K | ﹤0.01% |
24,127
-24,623
| -51% | -$149K |
|
|
DAWN
4787
CALL
DELISTED
Day One Biopharmaceuticals
DAWN
| $128K | ﹤0.01% |
10,800
+8,000
| +286% | +$104K |
|
4788
PUT
Gildan
GIL
$9.49B
| $128K | ﹤0.01% |
4,000
-100
| -2% | -$3.07K |
|
4789
PUT
West Fraser Timber
WFG
$5.21B
| $128K | ﹤0.01% |
1,500
+700
| +88% | +$52.8K |
|
4790
CALL
Arch Capital
ACGL
$35.7B
| $127K | ﹤0.01% |
1,700
-8,200
| -83% | -$593K |
|
4791
CALL
Brookdale Senior Living
BKD
$3.55B
| $127K | ﹤0.01% |
30,100
+26,900
| +841% | +$104K |
|
|
CAN
4792
CALL
Canaan Creative
CAN
$172M
| $127K | ﹤0.01% |
60,000
-16,800
| -22% | -$40.7K |
|
4793
PUT
Relmada Therapeutics
RLMD
$540M
| $127K | ﹤0.01% |
+51,900
| New | +$143K |
|
4794
CALL
TETRA Technologies
TTI
$1.08B
| $127K | ﹤0.01% |
37,800
+28,100
| +290% | +$81.3K |
|
|
MRNS
4795
PUT
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $127K | ﹤0.01% |
11,700
+2,000
| +21% | +$17.1K |
|
|
ROVR
4796
CALL
DELISTED
Rover Group, Inc. Class A Common Stock
ROVR
| $127K | ﹤0.01% |
25,900
-31,600
| -55% | -$145K |
|
4797
CALL
Alpha Pro Tech
APT
$49.9M
| $126K | ﹤0.01% |
31,800
-16,100
| -34% | -$63.4K |
|
4798
Evolus
EOLS
$397M
| $126K | ﹤0.01% |
17,409
+10,902
| +168% | +$94K |
|
4799
CALL
Gray Television
GTN
$437M
| $126K | ﹤0.01% |
16,000
+14,900
| +1,355% | +$115K |
|
4800
PUT
Garrett Motion
GTX
$5.37B
| $126K | ﹤0.01% |
16,700
+3,000
| +22% | +$24.1K |
|
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.