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 | |
|---|---|---|---|---|---|---|
4101
PUT
Clean Energy Fuels
CLNE
$421M
| $237K | ﹤0.01% |
47,900
+10,000
| +26% | +$43.8K |
|
4102
PUT
GoodRx Holdings
GDRX
$1.06B
| $237K | ﹤0.01% |
43,100
-800
| -2% | -$4.31K |
|
4103
PUT
Packaging Corp of America
PKG
$22.3B
| $237K | ﹤0.01% |
1,800
+1,400
| +350% | +$187K |
|
4104
PUT
Vicor
VICR
$8.21B
| $237K | ﹤0.01% |
4,400
-10,200
| -70% | -$503K |
|
4105
PUT
Capital Southwest
CSWC
$1.47B
| $236K | ﹤0.01% |
12,000
-4,200
| -26% | -$77.4K |
|
4106
PUT
HDFC Bank
HDB
$123B
| $236K | ﹤0.01% |
6,800
-64,000
| -90% | -$2.16M |
|
|
SI
4107
PUT
DELISTED
Silvergate Capital Corporation
SI
| $236K | ﹤0.01% |
337,600
-526,700
| -61% | -$744K |
|
4108
PUT
ACM Research
ACMR
$4.44B
| $235K | ﹤0.01% |
18,000
-44,300
| -71% | -$467K |
|
4109
PUT
Brookfield Renewable
BEP
$9.51B
| $235K | ﹤0.01% |
8,000
+5,400
| +208% | +$166K |
|
4110
IAMGOLD
IAG
$7.92B
| $235K | ﹤0.01% |
89,458
+48,393
| +118% | +$140K |
|
4111
CALL
Offerpad Solutions
OPAD
$18.4M
| $235K | ﹤0.01% |
1,820
+1,717
| +1,667% | +$144K |
|
4112
CALL
Phreesia
PHR
$694M
| $235K | ﹤0.01% |
7,600
-16,800
| -69% | -$526K |
|
4113
CALL
ABM Industries
ABM
$2.89B
| $234K | ﹤0.01% |
5,500
-2,000
| -27% | -$86.7K |
|
4114
PUT
BioCryst Pharmaceuticals
BCRX
$2.44B
| $234K | ﹤0.01% |
33,300
-78,300
| -70% | -$628K |
|
4115
CALL
Cathay General Bancorp
CATY
$4.23B
| $234K | ﹤0.01% |
7,300
+6,200
| +564% | +$197K |
|
|
CGC
4116
CALL
Canopy Growth
CGC
$365M
| $234K | ﹤0.01% |
60,490
-50,520
| -46% | -$530K |
|
4117
Hims & Hers Health
HIMS
$6.36B
| $234K | ﹤0.01% |
24,894
-99,195
| -80% | -$983K |
|
4118
MarineMax
HZO
$756M
| $234K | ﹤0.01% |
+6,873
| New | +$202K |
|
4119
Avita Medical
RCEL
$135M
| $234K | ﹤0.01% |
13,796
+11,951
| +648% | +$175K |
|
|
TPIC
4120
PUT
DELISTED
TPI Composites
TPIC
| $234K | ﹤0.01% |
22,600
| – | – |
|
4121
CALL
B2Gold
BTG
$4.92B
| $233K | ﹤0.01% |
65,300
+2,400
| +4% | +$9.39K |
|
4122
GDS Holdings
GDS
$5.89B
| $233K | ﹤0.01% |
21,203
+14,402
| +212% | +$191K |
|
|
LADR
4123
CALL
Ladder Capital
LADR
$1.24B
| $233K | ﹤0.01% |
21,500
-8,500
| -28% | -$82.3K |
|
4124
PUT
PagerDuty
PD
$824M
| $233K | ﹤0.01% |
10,400
-1,400
| -12% | -$38.9K |
|
4125
CALL
Vir Biotechnology
VIR
$1.45B
| $233K | ﹤0.01% |
9,500
-39,500
| -81% | -$992K |
|
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.