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 | |
|---|---|---|---|---|---|---|
4426
CALL
Pitney Bowes
PBI
$2.39B
| $251K | ﹤0.01% |
57,100
+11,100
| +24% | +$43K |
|
4427
CALL
TPG
TPG
$6.76B
| $250K | ﹤0.01% |
5,800
-2,200
| -28% | -$74.3K |
|
4428
CALL
Essential Utilities
WTRG
$11.5B
| $250K | ﹤0.01% |
6,700
+6,000
| +857% | +$209K |
|
4429
Alkermes
ALKS
$8.11B
| $249K | ﹤0.01% |
9,004
-14,991
| -62% | -$389K |
|
|
HUYA
4430
CALL
Huya Inc
HUYA
$558M
| $249K | ﹤0.01% |
68,100
+43,400
| +176% | +$145K |
|
4431
PUT
Prospect Capital
PSEC
$1.08B
| $249K | ﹤0.01% |
41,700
-3,700
| -8% | -$21.3K |
|
4432
CALL
Zurn Elkay Water Solutions
ZWS
$8.6B
| $249K | ﹤0.01% |
8,500
+5,600
| +193% | +$159K |
|
|
4433
PUT
Zurn Elkay Water Solutions
ZWS
$8.6B
| $249K | ﹤0.01% |
8,500
-2,200
| -21% | -$62.3K |
|
4434
Advanced Energy
AEIS
$10.1B
| $248K | ﹤0.01% |
2,282
+1,435
| +169% | +$139K |
|
4435
CALL
Eve Holding
EVEX
$777M
| $248K | ﹤0.01% |
34,000
-171,900
| -83% | -$1.27M |
|
4436
CALL
MGIC Investment
MTG
$6.47B
| $248K | ﹤0.01% |
12,900
-1,200
| -9% | -$21.2K |
|
4437
PUT
Pulse Biosciences
PLSE
$2.37B
| $248K | ﹤0.01% |
+20,300
| New | +$141K |
|
4438
ProShares Ultra Bloomberg Crude Oil
UCO
$432M
| $248K | ﹤0.01% |
+9,537
| New | +$288K |
|
4439
PUT
A.O. Smith
AOS
$8.55B
| $247K | ﹤0.01% |
3,000
-6,500
| -68% | -$479K |
|
4440
CALL
Intapp
INTA
$2.44B
| $247K | ﹤0.01% |
6,500
+1,200
| +23% | +$44.2K |
|
4441
CALL
Life Time Group Holdings
LTH
$10.2B
| $247K | ﹤0.01% |
16,400
+6,600
| +67% | +$94.7K |
|
4442
CALL
News Corp Class B
NWS
$17.7B
| $247K | ﹤0.01% |
9,700
-18,100
| -65% | -$410K |
|
4443
PUT
RB Global
RBA
$21.5B
| $247K | ﹤0.01% |
3,700
-21,000
| -85% | -$1.35M |
|
|
SRCL
4444
PUT
DELISTED
Stericycle Inc
SRCL
| $247K | ﹤0.01% |
+5,000
| New | +$224K |
|
|
KNTE
4445
PUT
DELISTED
Kinnate Biopharma Inc. Common Stock
KNTE
| $247K | ﹤0.01% |
+104,500
| New | +$185K |
|
4446
CALL
Capital Southwest
CSWC
$1.47B
| $246K | ﹤0.01% |
10,400
+4,900
| +89% | +$109K |
|
4447
CALL
Gossamer Bio
GOSS
$101M
| $246K | ﹤0.01% |
269,700
-70,000
| -21% | -$51.7K |
|
4448
CALL
Graphic Packaging
GPK
$3.35B
| $246K | ﹤0.01% |
10,000
-28,100
| -74% | -$630K |
|
|
LAC
4449
CALL
Lithium Americas
LAC
$951M
| $246K | ﹤0.01% |
+256,000
| New | +$1.91M |
|
4450
Lifestance Health
LFST
$4.15B
| $246K | ﹤0.01% |
+31,467
| New | +$203K |
|
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.