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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4801
CALL
Harrow
HROW
$1.44B
| $133K | ﹤0.01% |
9,300
-2,800
| -23% | -$49K |
|
4802
PUT
Innodata
INOD
$1.81B
| $133K | ﹤0.01% |
15,700
+10,300
| +191% | +$116K |
|
4803
CALL
Outset Medical
OM
$86.4M
| $133K | ﹤0.01% |
+820
| New | +$194K |
|
4804
PUT
Open Text
OTEX
$6.28B
| $133K | ﹤0.01% |
3,800
+3,600
| +1,800% | +$141K |
|
4805
PUT
Photronics
PLAB
$1.65B
| $133K | ﹤0.01% |
6,600
+2,600
| +65% | +$60.7K |
|
4806
CALL
Vertex
VERX
$2.16B
| $133K | ﹤0.01% |
+5,800
| New | +$119K |
|
|
BASE
4807
CALL
DELISTED
Couchbase
BASE
| $132K | ﹤0.01% |
7,700
+4,200
| +120% | +$68.8K |
|
4808
PUT
BioVie
BIVI
$9.5M
| $132K | ﹤0.01% |
389
+359
| +1,197% | +$140K |
|
4809
CALL
Wyndham Hotels & Resorts
WH
$5.61B
| $132K | ﹤0.01% |
1,900
-500
| -21% | -$37.1K |
|
|
DOC
4810
CALL
DELISTED
PHYSICIANS REALTY TRUST
DOC
| $132K | ﹤0.01% |
10,900
-20,000
| -65% | -$276K |
|
4811
PUT
Brookfield Renewable
BEPC
$5.86B
| $131K | ﹤0.01% |
5,500
-100
| -2% | -$2.9K |
|
4812
CALL
Brady Corp
BRC
$4.46B
| $131K | ﹤0.01% |
2,400
-900
| -27% | -$46.3K |
|
4813
Fortrea Holdings
FTRE
$1.93B
| $131K | ﹤0.01% |
+4,601
| New | +$136K |
|
|
RNAM
4814
CALL
DELISTED
Avidity Biosciences
RNAM
| $131K | ﹤0.01% |
20,600
+5,100
| +33% | +$43.9K |
|
4815
CALL
USA Compression Partners
USAC
$3.69B
| $131K | ﹤0.01% |
5,500
-10,900
| -66% | -$228K |
|
|
ESMT
4816
CALL
DELISTED
EngageSmart, Inc.
ESMT
| $131K | ﹤0.01% |
7,300
+7,100
| +3,550% | +$127K |
|
4817
CALL
Affiliated Managers Group
AMG
$9.51B
| $130K | ﹤0.01% |
1,000
| – | – |
|
4818
Anterix
ATEX
$1.72B
| $130K | ﹤0.01% |
4,163
+3,598
| +637% | +$113K |
|
4819
CALL
Herc Holdings
HRI
$4.78B
| $130K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$130K |
|
4820
CALL
Insight Enterprises
NSIT
$3.85B
| $130K | ﹤0.01% |
900
-500
| -36% | -$74.5K |
|
|
WSR
4821
CALL
DELISTED
Whitestone REIT
WSR
| $130K | ﹤0.01% |
13,500
-13,100
| -49% | -$130K |
|
|
LLAP
4822
CALL
DELISTED
Terran Orbital Corporation
LLAP
| $130K | ﹤0.01% |
156,600
-70,300
| -31% | -$93.1K |
|
|
HYZN
4823
CALL
DELISTED
Hyzon Motors Inc. Class A Common Stock
HYZN
| $130K | ﹤0.01% |
2,082
-1,610
| -44% | -$109K |
|
4824
VanEck Fallen Angel High Yield Bond ETF
ANGL
$3.07B
| $129K | ﹤0.01% |
+4,799
| New | +$132K |
|
4825
CALL
Badger Meter
BMI
$3.87B
| $129K | ﹤0.01% |
+900
| New | +$142K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.