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 | |
|---|---|---|---|---|---|---|
5351
Mitsubishi UFJ Financial
MUFG
$254B
| $78K | ﹤0.01% |
9,210
-21,529
| -70% | -$172K |
|
5352
Myriad Genetics
MYGN
$267M
| $78K | ﹤0.01% |
4,866
-40,521
| -89% | -$771K |
|
5353
CALL
Procept Biorobotics
PRCT
$1.04B
| $78K | ﹤0.01% |
2,400
-3,800
| -61% | -$130K |
|
|
SOHU
5354
PUT
Sohu.com
SOHU
$359M
| $78K | ﹤0.01% |
8,300
+8,200
| +8,200% | +$88.8K |
|
5355
Vanguard Consumer Discretionary ETF
VCR
$6.15B
| $78K | ﹤0.01% |
+291
| New | +$82.6K |
|
5356
PUT
W&T Offshore
WTI
$530M
| $78K | ﹤0.01% |
17,900
-800
| -4% | -$3.3K |
|
|
SEEL
5357
CALL
DELISTED
Seelos Therapeutics, Inc. Common Stock
SEEL
| $78K | ﹤0.01% |
112
+30
| +37% | +$129K |
|
|
ATHX
5358
CALL
DELISTED
Athersys, Inc. Common Stock
ATHX
| $78K | ﹤0.01% |
181,500
-30,000
| -14% | -$16.4K |
|
5359
PUT
Adient
ADNT
$1.64B
| $77K | ﹤0.01% |
2,100
-300
| -13% | -$12K |
|
5360
Amcor
AMCR
$20.7B
| $77K | ﹤0.01% |
+1,701
| New | +$81.9K |
|
5361
PUT
Columbia Banking Systems
COLB
$8.84B
| $77K | ﹤0.01% |
3,800
-400
| -10% | -$8.35K |
|
5362
Fluence Energy
FLNC
$1.87B
| $77K | ﹤0.01% |
+3,375
| New | +$87K |
|
5363
Korn Ferry
KFY
$4.17B
| $77K | ﹤0.01% |
+1,638
| New | +$83.2K |
|
5364
KLX Energy Services
KLXE
$44.6M
| $77K | ﹤0.01% |
6,546
+1,965
| +43% | +$21.9K |
|
5365
PUT
Lightbridge
LTBR
$287M
| $77K | ﹤0.01% |
17,200
+6,300
| +58% | +$33.1K |
|
5366
Nordson
NDSN
$16.6B
| $77K | ﹤0.01% |
348
+331
| +1,947% | +$79.2K |
|
|
TGB
5367
Trekor Metals
TGB
$2.48B
| $77K | ﹤0.01% |
61,266
+4,200
| +7% | +$5.81K |
|
5368
PUT
Vericel Corp
VCEL
$2.35B
| $77K | ﹤0.01% |
+2,300
| New | +$79.7K |
|
5369
CALL
XWELL
XWEL
$8.53M
| $77K | ﹤0.01% |
34,400
+32,680
| +1,900% | +$142K |
|
|
5370
PUT
XWELL
XWEL
$8.53M
| $77K | ﹤0.01% |
34,600
+32,870
| +1,900% | +$143K |
|
|
AAN
5371
CALL
DELISTED
The Aaron's Company Inc
AAN
| $77K | ﹤0.01% |
7,400
+5,800
| +363% | +$73.9K |
|
|
AIV
5372
PUT
Aimco
AIV
$387M
| $76K | ﹤0.01% |
11,300
+9,200
| +438% | +$73.2K |
|
5373
Actinium Pharmaceuticals
ATNM
$26.5M
| $76K | ﹤0.01% |
12,983
+2,329
| +22% | +$15.5K |
|
5374
PUT
Brookfield Infrastructure Partners
BIP
$19B
| $76K | ﹤0.01% |
2,600
-100
| -4% | -$3.31K |
|
5375
CALL
Brixmor Property Group
BRX
$9.65B
| $76K | ﹤0.01% |
3,700
+3,300
| +825% | +$73.1K |
|
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.