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 | |
|---|---|---|---|---|---|---|
2551
PUT
Recursion Pharmaceuticals
RXRX
$1.57B
| $1.12M | ﹤0.01% |
146,900
+139,200
| +1,808% | +$1.39M |
|
|
SEE
2552
DELISTED
Sealed Air
SEE
| $1.12M | ﹤0.01% |
34,164
+30,306
| +786% | +$1.17M |
|
2553
CALL
Ameriprise Financial
AMP
$46.8B
| $1.12M | ﹤0.01% |
3,400
+1,500
| +79% | +$512K |
|
2554
PUT
Ferguson
FERG
$44.7B
| $1.12M | ﹤0.01% |
6,800
+1,500
| +28% | +$237K |
|
2555
Huntington Bancshares
HBAN
$35.1B
| $1.12M | ﹤0.01% |
107,584
+46,598
| +76% | +$523K |
|
2556
PUT
Insmed
INSM
$23.2B
| $1.11M | ﹤0.01% |
44,100
-20,400
| -32% | -$467K |
|
|
RDFN
2557
CALL
DELISTED
Redfin
RDFN
| $1.11M | ﹤0.01% |
158,200
+3,300
| +2% | +$36.2K |
|
2558
CALL
ZipRecruiter
ZIP
$318M
| $1.11M | ﹤0.01% |
92,900
| – | – |
|
|
ENLC
2559
CALL
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $1.11M | ﹤0.01% |
91,100
-51,700
| -36% | -$616K |
|
2560
PUT
Procore
PCOR
$6.46B
| $1.11M | ﹤0.01% |
17,000
+15,400
| +963% | +$1.03M |
|
|
KEEL
2561
CALL
Keel Infrastructure Corp
KEEL
$2.57B
| $1.11M | ﹤0.01% |
1,036,100
+514,200
| +99% | +$751K |
|
2562
PUT
Sabre
SABR
$656M
| $1.11M | ﹤0.01% |
246,800
+42,100
| +21% | +$191K |
|
2563
PUT
Westrock Coffee
WEST
$741M
| $1.11M | ﹤0.01% |
124,900
+92,400
| +284% | +$962K |
|
|
BZUN
2564
CALL
Baozun
BZUN
$144M
| $1.1M | ﹤0.01% |
356,700
+282,600
| +381% | +$1.13M |
|
|
SF
2565
PUT
Stifel
SF
$12.3B
| $1.1M | ﹤0.01% |
27,000
+25,350
| +1,536% | +$1.07M |
|
|
SMAR
2566
PUT
DELISTED
Smartsheet Inc.
SMAR
| $1.1M | ﹤0.01% |
27,300
+7,200
| +36% | +$295K |
|
2567
ProShares Ultra QQQ
QLD
$12.5B
| $1.1M | ﹤0.01% |
37,198
+26,402
| +245% | +$847K |
|
|
CIVI
2568
DELISTED
Civitas Resources
CIVI
| $1.1M | ﹤0.01% |
+13,619
| New | +$1.05M |
|
|
NVMI
2569
PUT
Nova
NVMI
$13.9B
| $1.1M | ﹤0.01% |
9,800
+7,100
| +263% | +$835K |
|
2570
Weyerhaeuser
WY
$17.3B
| $1.1M | ﹤0.01% |
35,905
+2,753
| +8% | +$90.6K |
|
|
GTLS
2571
PUT
DELISTED
Chart Industries
GTLS
| $1.1M | ﹤0.01% |
6,500
-6,400
| -50% | -$1.08M |
|
2572
PUT
Applied Optoelectronics
AAOI
$8.04B
| $1.1M | ﹤0.01% |
100,000
+98,300
| +5,782% | +$1.04M |
|
2573
CALL
Ascendis Pharma A/S
ASND
$16.7B
| $1.09M | ﹤0.01% |
11,700
-3,500
| -23% | -$327K |
|
2574
PUT
Warrior Met Coal
HCC
$4.23B
| $1.09M | ﹤0.01% |
21,400
+19,000
| +792% | +$798K |
|
2575
CALL
Lamar Advertising Co
LAMR
$16.2B
| $1.09M | ﹤0.01% |
13,100
-10,700
| -45% | -$982K |
|
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.