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 | |
|---|---|---|---|---|---|---|
5201
Voya Financial
VOYA
$9.09B
| $90K | ﹤0.01% |
1,357
+342
| +34% | +$24.3K |
|
|
BDN
5202
PUT
Brandywine Realty Trust
BDN
$525M
| $89K | ﹤0.01% |
19,800
+16,800
| +560% | +$80K |
|
5203
PUT
Mativ Holdings
MATV
$472M
| $89K | ﹤0.01% |
6,300
+4,300
| +215% | +$68.8K |
|
5204
CALL
Nuvation Bio
NUVB
$2.33B
| $89K | ﹤0.01% |
+67,000
| New | +$112K |
|
5205
PUT
Riley Exploration Permian
REPX
$727M
| $89K | ﹤0.01% |
2,800
-5,900
| -68% | -$200K |
|
|
SLI
5206
CALL
Standard Lithium
SLI
$505M
| $89K | ﹤0.01% |
31,600
+1,600
| +5% | +$6.14K |
|
5207
CALL
SS&C Technologies
SSNC
$18.6B
| $89K | ﹤0.01% |
1,700
+200
| +13% | +$11.4K |
|
|
VRNA
5208
CALL
DELISTED
Verona Pharma
VRNA
| $89K | ﹤0.01% |
5,500
+2,100
| +62% | +$40.4K |
|
5209
PUT
Aegon
AEG
$14B
| $88K | ﹤0.01% |
18,400
+11,000
| +149% | +$56.7K |
|
5210
CALL
AirSculpt Technologies
AIRS
$342M
| $88K | ﹤0.01% |
13,000
+100
| +0.8% | +$801 |
|
5211
Astronics
ATRO
$3.38B
| $88K | ﹤0.01% |
6,679
+6,527
| +4,294% | +$98K |
|
5212
PUT
Bausch + Lomb
BLCO
$6.07B
| $88K | ﹤0.01% |
5,200
-10,900
| -68% | -$204K |
|
5213
PUT
GFL Environmental
GFL
$14.9B
| $88K | ﹤0.01% |
+2,800
| New | +$96.2K |
|
5214
Global Net Lease
GNL
$1.86B
| $88K | ﹤0.01% |
9,208
-333
| -3% | -$3.59K |
|
5215
PUT
NNN REIT
NNN
$9.16B
| $88K | ﹤0.01% |
2,500
+500
| +25% | +$20K |
|
|
NXDT
5216
CALL
NexPoint Diversified Real Estate Trust
NXDT
$231M
| $88K | ﹤0.01% |
+10,200
| New | +$109K |
|
5217
CALL
PRA Group
PRAA
$662M
| $88K | ﹤0.01% |
4,600
+2,100
| +84% | +$44.2K |
|
5218
TH International
THCH
$57.7M
| $88K | ﹤0.01% |
9,765
-19,671
| -67% | -$238K |
|
5219
ProShares UltraPro Russell2000
URTY
$327M
| $88K | ﹤0.01% |
+2,609
| New | +$108K |
|
5220
Adient
ADNT
$1.72B
| $87K | ﹤0.01% |
2,384
-703
| -23% | -$28K |
|
5221
Advanced Energy
AEIS
$11B
| $87K | ﹤0.01% |
847
-2,123
| -71% | -$238K |
|
5222
CALL
Artivion
AORT
$1.34B
| $87K | ﹤0.01% |
5,800
| – | – |
|
5223
PUT
Cognyte Software
CGNT
$647M
| $87K | ﹤0.01% |
18,100
-900
| -5% | -$4.56K |
|
5224
PUT
Euronet Worldwide
EEFT
$2.92B
| $87K | ﹤0.01% |
1,100
-300
| -21% | -$27.9K |
|
5225
PUT
Graco
GGG
$13B
| $87K | ﹤0.01% |
1,200
+200
| +20% | +$15.8K |
|
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.