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 | |
|---|---|---|---|---|---|---|
5901
CALL
PROG Holdings
PRG
$1.72B
| $61K | ﹤0.01% |
2,000
-4,400
| -69% | -$129K |
|
5902
PUT
Primerica
PRI
$10.1B
| $61K | ﹤0.01% |
+300
| New | +$61.3K |
|
5903
PUT
Ribbon Communications
RBBN
$373M
| $61K | ﹤0.01% |
21,200
-100
| -0.5% | -$225 |
|
5904
Riley Exploration Permian
REPX
$727M
| $61K | ﹤0.01% |
2,265
+1,975
| +681% | +$55.8K |
|
5905
ProShares Ultra Euro
ULE
$4.4M
| $61K | ﹤0.01% |
5,199
+1,283
| +33% | +$14.4K |
|
|
LILM
5906
PUT
DELISTED
Lilium N.V. Class A Ordinary Shares
LILM
| $61K | ﹤0.01% |
52,100
+46,500
| +830% | +$42.3K |
|
5907
CALL
Anixa Biosciences
ANIX
$121M
| $60K | ﹤0.01% |
15,500
+9,800
| +172% | +$33.1K |
|
5908
Associated Banc-Corp
ASB
$5.8B
| $60K | ﹤0.01% |
+2,847
| New | +$51.2K |
|
|
BPT
5909
PUT
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $60K | ﹤0.01% |
24,500
-200
| -0.8% | -$813 |
|
5910
CALL
B2Gold
BTG
$5.13B
| $60K | ﹤0.01% |
19,100
-23,600
| -55% | -$74.4K |
|
5911
CALL
GATX Corp
GATX
$6.45B
| $60K | ﹤0.01% |
500
-200
| -29% | -$22.1K |
|
|
5912
PUT
GATX Corp
GATX
$6.45B
| $60K | ﹤0.01% |
+500
| New | +$55.2K |
|
5913
CALL
IDEAYA Biosciences
IDYA
$3.5B
| $60K | ﹤0.01% |
1,700
-2,300
| -58% | -$68.7K |
|
5914
CALL
InvenTrust Properties
IVT
$2.74B
| $60K | ﹤0.01% |
2,400
-2,400
| -50% | -$59.8K |
|
5915
CALL
Invivyd
IVVD
$171M
| $60K | ﹤0.01% |
+15,300
| New | +$28.9K |
|
5916
PUT
JELD-WEN Holding
JELD
$117M
| $60K | ﹤0.01% |
+3,200
| New | +$47.6K |
|
|
MRCC
5917
CALL
DELISTED
Monroe Capital Corp
MRCC
| $60K | ﹤0.01% |
+8,500
| New | +$60.3K |
|
5918
CALL
Noodles & Co
NDLS
$105M
| $60K | ﹤0.01% |
2,400
+1,900
| +380% | +$41.5K |
|
|
OBE
5919
PUT
Obsidian Energy
OBE
$678M
| $60K | ﹤0.01% |
8,900
-23,300
| -72% | -$179K |
|
5920
CALL
Portland General Electric
POR
$5.8B
| $60K | ﹤0.01% |
1,400
+1,100
| +367% | +$45.7K |
|
5921
PUT
Quanterix
QTRX
$166M
| $60K | ﹤0.01% |
2,200
-7,500
| -77% | -$177K |
|
|
SNCR
5922
PUT
DELISTED
Synchronoss Technologies
SNCR
| $60K | ﹤0.01% |
+9,800
| New | +$47.8K |
|
5923
PUT
Stagwell
STGW
$2.1B
| $60K | ﹤0.01% |
9,100
+100
| +1% | +$498 |
|
5924
Atlas Lithium Corp
ATLX
$80.2M
| $59K | ﹤0.01% |
1,918
+240
| +14% | +$6.22K |
|
|
CKPT
5925
PUT
DELISTED
Checkpoint Therapeutics
CKPT
| $59K | ﹤0.01% |
26,000
+24,500
| +1,633% | +$53.3K |
|
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.