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 | |
|---|---|---|---|---|---|---|
5551
CALL
Gentex
GNTX
$4.97B
| $65K | ﹤0.01% |
2,000
+300
| +18% | +$9.62K |
|
|
GRFS
5552
PUT
Grifois
GRFS
$5.36B
| $65K | ﹤0.01% |
7,200
-1,300
| -15% | -$12.7K |
|
5553
CALL
Immunome
IMNM
$2.58B
| $65K | ﹤0.01% |
7,900
+7,500
| +1,875% | +$55.1K |
|
|
OTLY
5554
CALL
Oatly Group
OTLY
$465M
| $65K | ﹤0.01% |
3,630
-290
| -7% | -$8.44K |
|
|
VTYX
5555
PUT
DELISTED
Ventyx Biosciences
VTYX
| $65K | ﹤0.01% |
1,900
+1,700
| +850% | +$58.8K |
|
|
ACRE
5556
CALL
Ares Commercial Real Estate
ACRE
$236M
| $64K | ﹤0.01% |
6,800
-26,100
| -79% | -$269K |
|
5557
CALL
Angi Inc
ANGI
$229M
| $64K | ﹤0.01% |
3,260
+770
| +31% | +$22K |
|
5558
CALL
Aqua Metals
AQMS
$8.99M
| $64K | ﹤0.01% |
284
-26
| -8% | -$6.23K |
|
5559
American States Water
AWR
$3.36B
| $64K | ﹤0.01% |
+816
| New | +$69.5K |
|
5560
CarGurus
CARG
$3.27B
| $64K | ﹤0.01% |
3,705
-6,500
| -64% | -$128K |
|
5561
PUT
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$149M
| $64K | ﹤0.01% |
3,600
+2,500
| +227% | +$54.1K |
|
|
DADA
5562
CALL
DELISTED
Dada Nexus
DADA
| $64K | ﹤0.01% |
14,500
-15,800
| -52% | -$84K |
|
5563
PUT
Essential Properties Realty Trust
EPRT
$6.77B
| $64K | ﹤0.01% |
3,000
+700
| +30% | +$16.7K |
|
5564
CALL
Epsilon Energy
EPSN
$169M
| $64K | ﹤0.01% |
12,300
-81,400
| -87% | -$454K |
|
5565
PUT
Frontdoor
FTDR
$5.1B
| $64K | ﹤0.01% |
2,100
-1,700
| -45% | -$56.3K |
|
5566
Goldman Sachs Access Investment Grade Corporate Bond ETF
GIGB
$966M
| $64K | ﹤0.01% |
+1,504
| New | +$66.7K |
|
5567
PUT
Gildan
GIL
$10.3B
| $64K | ﹤0.01% |
2,300
-1,700
| -43% | -$51K |
|
|
NVNO
5568
CALL
enVVeno Medical
NVNO
$7.08M
| $64K | ﹤0.01% |
+340
| New | +$56.7K |
|
5569
Ranpak Holdings
PACK
$439M
| $64K | ﹤0.01% |
11,827
+10,552
| +828% | +$57.9K |
|
5570
PUT
PTC Therapeutics
PTCT
$5.68B
| $64K | ﹤0.01% |
2,900
| – | – |
|
|
TGR
5571
PUT
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $64K | ﹤0.01% |
1,700
-3,000
| -64% | -$113K |
|
5572
PUT
Banner Corp
BANR
$2.39B
| $63K | ﹤0.01% |
1,500
-500
| -25% | -$22.4K |
|
5573
BioAtla
BCAB
$5.46M
| $63K | ﹤0.01% |
+750
| New | +$95.6K |
|
5574
PUT
Clearfield
CLFD
$411M
| $63K | ﹤0.01% |
2,200
-2,700
| -55% | -$106K |
|
|
DESP
5575
DELISTED
Despegar.com
DESP
| $63K | ﹤0.01% |
8,777
+6,149
| +234% | +$46.6K |
|
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.