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 | |
|---|---|---|---|---|---|---|
3726
CALL
SELLAS Life Sciences
SLS
$1.98B
| $365K | ﹤0.01% |
222,800
-56,300
| -20% | -$88.8K |
|
|
TEN
3727
PUT
Tsakos Energy Navigation Ltd
TEN
$1.18B
| $365K | ﹤0.01% |
17,600
-25,000
| -59% | -$495K |
|
3728
Photronics
PLAB
$1.72B
| $364K | ﹤0.01% |
18,049
-615
| -3% | -$14.4K |
|
3729
PUT
Sotera Health
SHC
$5.06B
| $364K | ﹤0.01% |
24,300
+3,300
| +16% | +$55.7K |
|
3730
CALL
Akebia Therapeutics
AKBA
$341M
| $363K | ﹤0.01% |
318,800
+36,200
| +13% | +$46.5K |
|
3731
PUT
Celldex Therapeutics
CLDX
$2.79B
| $363K | ﹤0.01% |
13,200
+4,400
| +50% | +$138K |
|
3732
CALL
3D Systems Corp
DDD
$412M
| $363K | ﹤0.01% |
74,100
+51,600
| +229% | +$370K |
|
3733
CALL
Paylocity
PCTY
$7.43B
| $363K | ﹤0.01% |
2,000
-2,100
| -51% | -$422K |
|
|
NVMI
3734
Nova
NVMI
$12.8B
| $362K | ﹤0.01% |
+3,221
| New | +$379K |
|
3735
Assurant
AIZ
$14B
| $361K | ﹤0.01% |
2,516
+2,370
| +1,623% | +$325K |
|
3736
Alerian MLP ETF
AMLP
$12.9B
| $360K | ﹤0.01% |
+8,535
| New | +$350K |
|
3737
PUT
Black Stone Minerals
BSM
$3.14B
| $360K | ﹤0.01% |
20,900
-29,500
| -59% | -$503K |
|
3738
Baytex Energy
BTE
$2.86B
| $360K | ﹤0.01% |
+81,780
| New | +$321K |
|
|
EH
3739
EHang Holdings
EH
$397M
| $360K | ﹤0.01% |
20,021
-61,736
| -76% | -$1.14M |
|
3740
CALL
Entergy
ETR
$52.4B
| $360K | ﹤0.01% |
7,800
-400
| -5% | -$19.5K |
|
3741
PUT
ImmunityBio
IBRX
$7.3B
| $360K | ﹤0.01% |
213,600
-14,700
| -6% | -$29.5K |
|
3742
MACOM Technology Solutions
MTSI
$19B
| $360K | ﹤0.01% |
+4,424
| New | +$327K |
|
3743
PUT
Revolution Medicines
RVMD
$39.1B
| $359K | ﹤0.01% |
13,000
+10,100
| +348% | +$300K |
|
|
AY
3744
PUT
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $359K | ﹤0.01% |
18,800
-195,800
| -91% | -$4.43M |
|
3745
CALL
Broadstone Net Lease
BNL
$4.3B
| $358K | ﹤0.01% |
25,100
+6,600
| +36% | +$106K |
|
3746
Invesco CurrencyShares Canadian Dollar Trust
FXC
$72.7M
| $358K | ﹤0.01% |
4,974
-1,324
| -21% | -$96.6K |
|
3747
Varonis Systems
VRNS
$5.13B
| $358K | ﹤0.01% |
11,734
-565
| -5% | -$16.7K |
|
3748
CALL
American Financial Group
AFG
$12B
| $357K | ﹤0.01% |
3,200
+2,700
| +540% | +$312K |
|
3749
CALL
Barings BDC
BBDC
$885M
| $357K | ﹤0.01% |
40,100
+37,700
| +1,571% | +$324K |
|
3750
CALL
CoreCivic
CXW
$3.03B
| $357K | ﹤0.01% |
31,800
+14,500
| +84% | +$146K |
|
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.