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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2601
CALL
Sturm, Ruger & Co
RGR
$610M
| $1.53M | ﹤0.01% |
33,600
+29,700
| +762% | +$1.43M |
|
2602
CALL
Roivant Sciences
ROIV
$25.2B
| $1.52M | ﹤0.01% |
135,800
-15,500
| -10% | -$151K |
|
2603
PUT
AppFolio
APPF
$5.85B
| $1.52M | ﹤0.01% |
+8,800
| New | +$1.65M |
|
|
ESPR
2604
CALL
DELISTED
Esperion Therapeutics
ESPR
| $1.52M | ﹤0.01% |
509,300
+281,400
| +123% | +$365K |
|
|
JKS
2605
CALL
JinkoSolar
JKS
$775M
| $1.52M | ﹤0.01% |
41,100
-2,200
| -5% | -$71K |
|
2606
CALL
Entergy
ETR
$54.1B
| $1.52M | ﹤0.01% |
30,000
+22,200
| +285% | +$1.08M |
|
2607
Fastly Inc
FSLY
$3.17B
| $1.51M | ﹤0.01% |
85,068
+47,894
| +129% | +$808K |
|
2608
Liberty Global Class A
LBTYA
$3.31B
| $1.51M | ﹤0.01% |
85,200
+30,782
| +57% | +$499K |
|
|
SWAV
2609
DELISTED
Shockwave Medical, Inc. Common Stock
SWAV
| $1.51M | ﹤0.01% |
7,942
+630
| +9% | +$119K |
|
2610
CALL
Noble Corp
NE
$6.9B
| $1.51M | ﹤0.01% |
31,400
+28,700
| +1,063% | +$1.34M |
|
2611
C3.ai
AI
$1.27B
| $1.51M | ﹤0.01% |
+52,536
| New | +$1.45M |
|
2612
CALL
Gen Digital
GEN
$15.6B
| $1.51M | ﹤0.01% |
66,100
-114,600
| -63% | -$2.27M |
|
2613
PUT
Ormat Technologies
ORA
$6.11B
| $1.51M | ﹤0.01% |
19,900
-17,700
| -47% | -$1.2M |
|
2614
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $1.51M | ﹤0.01% |
35,500
-35,000
| -50% | -$1.22M |
|
|
DO
2615
CALL
DELISTED
Diamond Offshore Drilling, Inc.
DO
| $1.51M | ﹤0.01% |
115,900
-2,800
| -2% | -$36.2K |
|
2616
Ross Stores
ROST
$76.6B
| $1.5M | ﹤0.01% |
10,882
+4,637
| +74% | +$578K |
|
2617
PUT
Taboola.com
TBLA
$1.32B
| $1.5M | ﹤0.01% |
347,600
+310,900
| +847% | +$1.17M |
|
|
BINI
2618
PUT
DELISTED
Bollinger Innovations
BINI
| – | – |
0
| – | – |
|
2619
PUT
Leggett & Platt
LEG
$1.52B
| $1.5M | ﹤0.01% |
57,400
-30,400
| -35% | -$746K |
|
2620
Under Armour Class C
UA
$2.92B
| $1.5M | ﹤0.01% |
179,649
+59,772
| +50% | +$432K |
|
2621
CALL
Pacira BioSciences
PCRX
$1.02B
| $1.5M | ﹤0.01% |
44,400
+32,900
| +286% | +$963K |
|
2622
CALL
Aecom
ACM
$9.07B
| $1.5M | ﹤0.01% |
16,200
+3,400
| +27% | +$289K |
|
2623
Independence Realty Trust
IRT
$3.92B
| $1.49M | ﹤0.01% |
+97,573
| New | +$1.35M |
|
2624
PUT
Credit Acceptance
CACC
$6B
| $1.49M | ﹤0.01% |
2,800
-1,600
| -36% | -$719K |
|
2625
PUT
FirstCash
FCFS
$8.55B
| $1.48M | ﹤0.01% |
13,700
+3,000
| +28% | +$325K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.