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 | |
|---|---|---|---|---|---|---|
4551
CALL
Vanguard FTSE Developed Markets ETF
VEA
$223B
| $166K | ﹤0.01% |
3,800
-10,000
| -72% | -$458K |
|
|
DAWN
4552
CALL
DELISTED
Day One Biopharmaceuticals
DAWN
| $165K | ﹤0.01% |
13,500
+2,700
| +25% | +$35.2K |
|
4553
CALL
Mercury Insurance
MCY
$6B
| $165K | ﹤0.01% |
5,900
+1,800
| +44% | +$53.1K |
|
4554
MillerKnoll
MLKN
$1.56B
| $165K | ﹤0.01% |
6,778
+6,699
| +8,480% | +$125K |
|
4555
PUT
Sun Communities
SUI
$15.8B
| $165K | ﹤0.01% |
+1,400
| New | +$178K |
|
|
HOLI
4556
DELISTED
Hollsys Automation Technologies INTERNATIONAL, LTD. COMMON (British Virgin Island)
HOLI
| $165K | ﹤0.01% |
8,355
+8,145
| +3,879% | +$147K |
|
|
NETI
4557
CALL
DELISTED
Eneti Inc.
NETI
| $165K | ﹤0.01% |
16,400
-15,500
| -49% | -$178K |
|
|
DADA
4558
DELISTED
Dada Nexus
DADA
| $164K | ﹤0.01% |
36,896
+12,769
| +53% | +$67.9K |
|
4559
PUT
Ecopetrol
EC
$33.7B
| $164K | ﹤0.01% |
14,200
-26,400
| -65% | -$303K |
|
|
EFC
4560
CALL
Ellington Financial
EFC
$1.69B
| $164K | ﹤0.01% |
13,200
-20,700
| -61% | -$276K |
|
4561
Hyatt Hotels
H
$17.5B
| $164K | ﹤0.01% |
+1,551
| New | +$177K |
|
|
NEWP
4562
PUT
New Pacific Metals
NEWP
$809M
| $164K | ﹤0.01% |
93,100
-4,700
| -5% | -$11K |
|
|
RWT
4563
PUT
Redwood Trust
RWT
$588M
| $164K | ﹤0.01% |
23,100
-400
| -2% | -$2.94K |
|
|
TWKS
4564
PUT
DELISTED
Thoughtworks Holding, Inc. Common Stock
TWKS
| $164K | ﹤0.01% |
40,200
+39,600
| +6,600% | +$225K |
|
|
OSG
4565
Octave Specialty Group
OSG
$257M
| $163K | ﹤0.01% |
13,592
-70,393
| -84% | -$946K |
|
4566
CALL
Compass Diversified
CODI
$752M
| $163K | ﹤0.01% |
8,700
-2,900
| -25% | -$61K |
|
4567
Douglas Emmett
DEI
$2.05B
| $163K | ﹤0.01% |
12,779
+6,194
| +94% | +$83.8K |
|
4568
PUT
Denison Mines
DNN
$2.43B
| $163K | ﹤0.01% |
99,100
-1,100
| -1% | -$1.52K |
|
4569
CALL
Genesco
GCO
$434M
| $163K | ﹤0.01% |
5,300
-12,900
| -71% | -$366K |
|
4570
CALL
Harmony Biosciences
HRMY
$2.08B
| $163K | ﹤0.01% |
5,000
+3,200
| +178% | +$111K |
|
4571
CALL
Host Hotels & Resorts
HST
$17.5B
| $163K | ﹤0.01% |
10,200
-21,700
| -68% | -$362K |
|
4572
CALL
Lincoln Electric
LECO
$14.1B
| $163K | ﹤0.01% |
900
+700
| +350% | +$134K |
|
|
OPRA
4573
PUT
Opera Ltd
OPRA
$1.68B
| $163K | ﹤0.01% |
14,500
+5,400
| +59% | +$90.4K |
|
4574
CALL
Progyny
PGNY
$2.46B
| $163K | ﹤0.01% |
4,800
+1,900
| +66% | +$71.7K |
|
|
PPBI
4575
CALL
DELISTED
Pacific Premier Bancorp
PPBI
| $163K | ﹤0.01% |
+7,500
| New | +$173K |
|
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.