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 | |
|---|---|---|---|---|---|---|
3476
NCR Atleos
NATL
$3.47B
| $617K | ﹤0.01% |
+25,408
| New | +$582K |
|
|
PPL
3477
PUT
PPL Corp
PPL
$27.1B
| $617K | ﹤0.01% |
22,800
-1,100
| -5% | -$27.9K |
|
3478
Stratasys
SSYS
$700M
| $617K | ﹤0.01% |
43,210
+7,024
| +19% | +$82.1K |
|
|
MACK
3479
CALL
DELISTED
Merrimack Pharmaceuticals, Inc.
MACK
| $615K | ﹤0.01% |
45,900
-10,300
| -18% | -$130K |
|
3480
PUT
Host Hotels & Resorts
HST
$17.1B
| $613K | ﹤0.01% |
31,500
-14,500
| -32% | -$249K |
|
3481
TotalEnergies
TTE
$187B
| $613K | ﹤0.01% |
+9,100
| New | +$607K |
|
3482
ProShares Ultra Silver
AGQ
$1.18B
| $612K | ﹤0.01% |
22,544
-40,722
| -64% | -$1.08M |
|
|
SFBS
3483
CALL
ServisFirst Bancshares
SFBS
$4.82B
| $612K | ﹤0.01% |
9,200
+8,500
| +1,214% | +$459K |
|
3484
Colgate-Palmolive
CL
$73.6B
| $611K | ﹤0.01% |
7,668
-65,540
| -90% | -$4.93M |
|
3485
ICICI Bank
IBN
$107B
| $611K | ﹤0.01% |
25,654
-13,031
| -34% | -$300K |
|
3486
CALL
Imperial Petroleum
IMPP
$217M
| $611K | ﹤0.01% |
232,200
+174,200
| +300% | +$320K |
|
3487
CALL
Invesco Mortgage Capital
IVR
$762M
| $611K | ﹤0.01% |
126,000
-13,600
| -10% | -$111K |
|
3488
PUT
Vermilion Energy
VET
$1.62B
| $611K | ﹤0.01% |
50,700
+10,400
| +26% | +$138K |
|
|
TELL
3489
CALL
DELISTED
Tellurian Inc.
TELL
| $611K | ﹤0.01% |
809,600
+139,600
| +21% | +$99K |
|
3490
Brinker International
EAT
$8.38B
| $610K | ﹤0.01% |
14,142
+13,208
| +1,414% | +$475K |
|
3491
CALL
AbCellera Biologics
ABCL
$1.6B
| $609K | ﹤0.01% |
106,700
-17,500
| -14% | -$81.1K |
|
|
LKFT
3492
CALL
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.84B
| $609K | ﹤0.01% |
15,000
-11,400
| -43% | -$420K |
|
|
HIVE
3493
PUT
HIVE Digital Technologies
HIVE
$789M
| $609K | ﹤0.01% |
134,600
+125,500
| +1,379% | +$428K |
|
3494
MSC Industrial Direct
MSM
$7.07B
| $605K | ﹤0.01% |
+5,975
| New | +$591K |
|
3495
CALL
Allegiant Air
ALGT
$2.66B
| $603K | ﹤0.01% |
7,300
+2,900
| +66% | +$209K |
|
3496
CALL
UWM Holdings
UWMC
$624M
| $602K | ﹤0.01% |
84,300
+44,000
| +109% | +$248K |
|
3497
Allison Transmission
ALSN
$10.1B
| $601K | ﹤0.01% |
10,342
+8,730
| +542% | +$487K |
|
3498
PUT
Landstar System
LSTR
$6.5B
| $600K | ﹤0.01% |
3,100
+2,500
| +417% | +$443K |
|
3499
Mission Produce
AVO
$1.12B
| $599K | ﹤0.01% |
59,399
+58,148
| +4,648% | +$540K |
|
3500
Dynatrace
DT
$12.7B
| $599K | ﹤0.01% |
+10,961
| New | +$554K |
|
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.