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 | |
|---|---|---|---|---|---|---|
5701
PagerDuty
PD
$816M
| $56K | ﹤0.01% |
2,531
-3,676
| -59% | -$87.7K |
|
5702
CALL
Sabesp
SBS
$19.1B
| $56K | ﹤0.01% |
24,236
| – | – |
|
|
SLRN
5703
PUT
DELISTED
ACELYRIN
SLRN
| $56K | ﹤0.01% |
+5,600
| New | +$119K |
|
5704
CALL
TaskUs
TASK
$556M
| $56K | ﹤0.01% |
5,400
-5,000
| -48% | -$53.8K |
|
5705
Universal Insurance Holdings
UVE
$1.22B
| $56K | ﹤0.01% |
+4,033
| New | +$56.7K |
|
|
AMPS
5706
CALL
DELISTED
Altus Power
AMPS
| $56K | ﹤0.01% |
10,800
+10,400
| +2,600% | +$63.7K |
|
|
ALTR
5707
CALL
DELISTED
Altair Engineering Inc
ALTR
| $56K | ﹤0.01% |
+900
| New | +$60.5K |
|
|
GTHX
5708
CALL
DELISTED
G1 Therapeutics, Inc. Common Stock
GTHX
| $56K | ﹤0.01% |
39,500
-23,100
| -37% | -$44.7K |
|
5709
Aegon
AEG
$14B
| $55K | ﹤0.01% |
11,484
+8,371
| +269% | +$43.1K |
|
5710
Alamos Gold
AGI
$11.6B
| $55K | ﹤0.01% |
+4,909
| New | +$59.1K |
|
|
AHRT
5711
AH Realty Trust
AHRT
$529M
| $55K | ﹤0.01% |
5,393
+5,337
| +9,530% | +$62K |
|
5712
CALL
Alarm.com
ALRM
$2.71B
| $55K | ﹤0.01% |
900
+600
| +200% | +$33.9K |
|
5713
Arbe Robotics
ARBE
$80.3M
| $55K | ﹤0.01% |
23,853
+4,705
| +25% | +$12.6K |
|
5714
AXT Inc
AXTI
$3.95B
| $55K | ﹤0.01% |
23,076
-6,201
| -21% | -$16.4K |
|
|
BGFV
5715
DELISTED
Big 5 Sporting Goods
BGFV
| $55K | ﹤0.01% |
+7,868
| New | +$65.5K |
|
5716
Teucrium Sugar Fund
CANE
$74.6M
| $55K | ﹤0.01% |
+3,758
| New | +$52K |
|
|
OLO
5717
PUT
DELISTED
Olo Inc
OLO
| $55K | ﹤0.01% |
9,200
-800
| -8% | -$5.23K |
|
5718
PUT
OppFi
OPFI
$800M
| $55K | ﹤0.01% |
+22,000
| New | +$51.2K |
|
|
SEMR
5719
PUT
DELISTED
Semrush
SEMR
| $55K | ﹤0.01% |
+6,500
| New | +$60.5K |
|
5720
Smith Micro Software
SMSI
$14.5M
| $55K | ﹤0.01% |
1,144
+694
| +154% | +$36.4K |
|
5721
CALL
TransAlta
TAC
$3.95B
| $55K | ﹤0.01% |
6,400
+5,900
| +1,180% | +$57.3K |
|
5722
CALL
Turning Point Brands
TPB
$1.45B
| $55K | ﹤0.01% |
2,400
-2,000
| -45% | -$48.7K |
|
5723
PUT
Visteon
VC
$2.79B
| $55K | ﹤0.01% |
+400
| New | +$57.6K |
|
|
AXNX
5724
DELISTED
Axonics, Inc. Common Stock
AXNX
| $55K | ﹤0.01% |
+997
| New | +$56.1K |
|
|
TGH
5725
PUT
DELISTED
Textainer Group Holdings limited
TGH
| $55K | ﹤0.01% |
1,500
-6,600
| -81% | -$264K |
|
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.