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 | |
|---|---|---|---|---|---|---|
5476
PUT
LSB Industries
LXU
$783M
| $70K | ﹤0.01% |
6,900
-4,100
| -37% | -$42.5K |
|
5477
CALL
Perma-Fix Environmental Services
PESI
$352M
| $70K | ﹤0.01% |
6,700
+6,100
| +1,017% | +$67.2K |
|
5478
CALL
Park Hotels & Resorts
PK
$3.03B
| $70K | ﹤0.01% |
5,700
-18,600
| -77% | -$240K |
|
5479
CALL
US Commodity Index
USCI
$369M
| $70K | ﹤0.01% |
1,200
-100
| -8% | -$5.81K |
|
5480
CALL
Vitesse Energy
VTS
$651M
| $70K | ﹤0.01% |
3,100
+1,200
| +63% | +$28.2K |
|
5481
Zymeworks
ZYME
$1.61B
| $70K | ﹤0.01% |
11,143
-25,881
| -70% | -$191K |
|
|
AIRC
5482
PUT
DELISTED
Apartment Income REIT Corp.
AIRC
| $70K | ﹤0.01% |
2,300
-6,100
| -73% | -$207K |
|
5483
BioVie
BIVI
$11.5M
| $69K | ﹤0.01% |
204
+105
| +106% | +$41K |
|
5484
Direxion Daily Energy Bear 2X ETF
ERY
$39.1M
| $69K | ﹤0.01% |
+2,819
| New | +$75.3K |
|
5485
CALL
GoodRx Holdings
GDRX
$1.04B
| $69K | ﹤0.01% |
12,400
+1,000
| +9% | +$6.67K |
|
5486
CALL
Merit Medical Systems
MMSI
$5.07B
| $69K | ﹤0.01% |
1,000
+800
| +400% | +$57.6K |
|
5487
Mercury Systems
MRCY
$5.83B
| $69K | ﹤0.01% |
+1,871
| New | +$69K |
|
5488
New Fortress Energy
NFE
$92.1M
| $69K | ﹤0.01% |
+2,111
| New | +$62K |
|
|
NFGC
5489
New Found Gold
NFGC
$522M
| $69K | ﹤0.01% |
16,770
+717
| +4% | +$3.24K |
|
5490
PUT
Rigetti Computing
RGTI
$4.97B
| $69K | ﹤0.01% |
+52,600
| New | +$101K |
|
5491
PUT
Radiant Logistics
RLGT
$386M
| $69K | ﹤0.01% |
+12,300
| New | +$83.6K |
|
5492
CALL
W.R. Berkley
WRB
$26.9B
| $69K | ﹤0.01% |
1,650
-300
| -15% | -$12.4K |
|
5493
PUT
Wolverine World Wide
WWW
$1.61B
| $69K | ﹤0.01% |
8,600
+8,000
| +1,333% | +$82.3K |
|
5494
CALL
Zevia
ZVIA
$122M
| $69K | ﹤0.01% |
31,100
-6,200
| -17% | -$18.2K |
|
|
TWOU
5495
PUT
DELISTED
2U Inc
TWOU
| $69K | ﹤0.01% |
+933
| New | +$95.4K |
|
|
NATI
5496
DELISTED
National Instruments Corp
NATI
| $69K | ﹤0.01% |
1,167
+369
| +46% | +$21.7K |
|
5497
Aaon
AAON
$7.3B
| $68K | ﹤0.01% |
1,206
+205
| +20% | +$13K |
|
5498
CALL
Argan
AGX
$8B
| $68K | ﹤0.01% |
1,500
| – | – |
|
|
BLDP
5499
PUT
Ballard Power Systems
BLDP
$805M
| $68K | ﹤0.01% |
18,800
-600
| -3% | -$2.57K |
|
5500
CALL
Clearwater Paper
CLW
$339M
| $68K | ﹤0.01% |
1,900
-600
| -24% | -$20.8K |
|
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.