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 | |
|---|---|---|---|---|---|---|
876
CALL
Exelon
EXC
$48.4B
| $10.3M | 0.01% |
266,800
-175,100
| -40% | -$7.24M |
|
877
CALL
Deckers Outdoor
DECK
$13.4B
| $10.2M | 0.01% |
116,400
-15,600
| -12% | -$1.25M |
|
878
CALL
TG Therapeutics
TGTX
$8.5B
| $10.2M | 0.01% |
411,800
+195,000
| +90% | +$5.04M |
|
879
PUT
Aon
AON
$76B
| $10.2M | 0.01% |
29,600
+12,700
| +75% | +$4.12M |
|
|
IPFF
880
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $10.2M | 0.01% |
150,400
-50,100
| -25% | -$3.39M |
|
881
PUT
Target Hospitality
TH
$1.63B
| $10.1M | 0.01% |
755,800
+695,000
| +1,143% | +$9.62M |
|
882
PUT
General Dynamics
GD
$103B
| $10.1M | 0.01% |
47,100
-57,400
| -55% | -$12.4M |
|
883
CALL
Rambus
RMBS
$11.2B
| $10.1M | 0.01% |
157,900
+53,900
| +52% | +$2.97M |
|
884
Colgate-Palmolive
CL
$72.1B
| $10.1M | 0.01% |
+131,365
| New | +$10.2M |
|
885
CALL
Silicon Motion
SIMO
$9.8B
| $10.1M | 0.01% |
140,400
+122,600
| +689% | +$7.84M |
|
886
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $10.1M | 0.01% |
155,900
+9,000
| +6% | +$610K |
|
887
CALL
Teradyne
TER
$58.5B
| $10.1M | 0.01% |
90,300
+35,700
| +65% | +$3.58M |
|
|
AXON
888
CALL
Axon Enterprise
AXON
$39.6B
| $10M | 0.01% |
51,500
-24,400
| -32% | -$5.05M |
|
|
HZNP
889
CALL
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $10M | 0.01% |
97,700
+81,600
| +507% | +$8.61M |
|
890
PUT
HSBC
HSBC
$349B
| $10M | 0.01% |
253,600
-91,800
| -27% | -$3.43M |
|
891
PUT
Synchrony
SYF
$23.3B
| $10M | 0.01% |
296,100
-40,000
| -12% | -$1.22M |
|
892
CALL
CSX Corp
CSX
$98.1B
| $10M | 0.01% |
294,200
-92,500
| -24% | -$2.93M |
|
893
PUT
Kenvue
KVUE
$36.3B
| $10M | 0.01% |
+378,600
| New | +$9.87M |
|
894
CALL
Zions Bancorporation
ZION
$10.1B
| $9.98M | 0.01% |
371,600
+208,600
| +128% | +$5.79M |
|
|
MMP
895
CALL
DELISTED
Magellan Midstream Partners, L.P.
MMP
| $9.98M | 0.01% |
160,100
-21,100
| -12% | -$1.23M |
|
896
Warner Bros
WBD
$65.1B
| $9.95M | 0.01% |
793,324
+662,104
| +505% | +$8.59M |
|
897
CALL
First Citizens BancShares
FCNCA
$25.6B
| $9.88M | 0.01% |
7,700
-9,000
| -54% | -$10.4M |
|
898
CALL
Viking Therapeutics
VKTX
$4.11B
| $9.88M | 0.01% |
609,500
+117,300
| +24% | +$2.46M |
|
899
CALL
e.l.f. Beauty
ELF
$4.49B
| $9.87M | 0.01% |
86,400
+49,600
| +135% | +$4.77M |
|
900
CALL
Hershey
HSY
$34.9B
| $9.86M | 0.01% |
39,500
+3,600
| +10% | +$944K |
|
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.