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 | |
|---|---|---|---|---|---|---|
6951
BBVA Argentina
BBAR
$3.79B
| $16K | ﹤0.01% |
2,652
-5,568
| -68% | -$26.7K |
|
6952
CALL
CBAK Energy Technology Ltd
CBAT
$43M
| $16K | ﹤0.01% |
13,700
-1,400
| -9% | -$1.36K |
|
6953
CALL
CareDx
CDNA
$1.85B
| $16K | ﹤0.01% |
1,900
-700
| -27% | -$5.84K |
|
|
CKPT
6954
PUT
DELISTED
Checkpoint Therapeutics
CKPT
| $16K | ﹤0.01% |
6,500
-30,200
| -82% | -$82.5K |
|
6955
Celldex Therapeutics
CLDX
$2.81B
| $16K | ﹤0.01% |
+491
| New | +$16.5K |
|
6956
CALL
Vita Coco
COCO
$3.84B
| $16K | ﹤0.01% |
600
-16,000
| -96% | -$390K |
|
|
DAO
6957
PUT
Youdao
DAO
$1.91B
| $16K | ﹤0.01% |
3,400
-7,000
| -67% | -$38.8K |
|
6958
PUT
Delek Logistics
DKL
$3.12B
| $16K | ﹤0.01% |
300
-9,600
| -97% | -$481K |
|
6959
Diana Shipping
DSX
$266M
| $16K | ﹤0.01% |
5,523
-2,712
| -33% | -$8.3K |
|
6960
Excelerate Energy
EE
$1.2B
| $16K | ﹤0.01% |
799
+123
| +18% | +$2.57K |
|
6961
PUT
Ero Copper
ERO
$2.61B
| $16K | ﹤0.01% |
800
-300
| -27% | -$5.67K |
|
6962
CALL
Forte Biosciences
FBRX
$1.57B
| $16K | ﹤0.01% |
620
+28
| +5% | +$727 |
|
6963
Flux Power
FLUX
$12M
| $16K | ﹤0.01% |
+3,725
| New | +$14.5K |
|
6964
Genco Shipping & Trading
GNK
$1.09B
| $16K | ﹤0.01% |
1,211
-6,155
| -84% | -$88.5K |
|
6965
CALL
Ingles Markets
IMKTA
$1.73B
| $16K | ﹤0.01% |
+200
| New | +$17.2K |
|
6966
Quadratic Interest Rate Volatility and Inflation Hedge ETF
IVOL
$271M
| $16K | ﹤0.01% |
+800
| New | +$17.9K |
|
|
JBGS
6967
PUT
JBG SMITH
JBGS
$859M
| $16K | ﹤0.01% |
1,100
-15,700
| -93% | -$229K |
|
6968
Standard BioTools
LAB
$325M
| $16K | ﹤0.01% |
8,565
-9,578
| -53% | -$18.9K |
|
6969
CALL
LivePerson
LPSN
$22.7M
| $16K | ﹤0.01% |
240
-1,913
| -89% | -$124K |
|
6970
Lantronix
LTRX
$228M
| $16K | ﹤0.01% |
3,903
+1,828
| +88% | +$7.79K |
|
6971
CALL
LiveOne
LVO
$63.5M
| $16K | ﹤0.01% |
950
-1,690
| -64% | -$23.9K |
|
6972
PUT
MDU Resources
MDU
$4.28B
| $16K | ﹤0.01% |
+1,444
| New | +$16.2K |
|
6973
CALL
Merit Medical Systems
MMSI
$4.68B
| $16K | ﹤0.01% |
200
| – | – |
|
6974
PUT
Modine Manufacturing
MOD
$9.9B
| $16K | ﹤0.01% |
500
+200
| +67% | +$4.99K |
|
|
MSB
6975
CALL
Mesabi Trust
MSB
$300M
| $16K | ﹤0.01% |
800
+600
| +300% | +$12.9K |
|
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.