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 | |
|---|---|---|---|---|---|---|
7126
FTC Solar
FTCI
$51.2M
| $15K | ﹤0.01% |
2,224
-487
| -18% | -$4.42K |
|
7127
PUT
Galectin Therapeutics
GALT
$223M
| $15K | ﹤0.01% |
9,300
-600
| -6% | -$1.16K |
|
|
HDSN
7128
Hudson Technologies
HDSN
$263M
| $15K | ﹤0.01% |
+1,152
| New | +$14.9K |
|
7129
CALL
Home BancShares
HOMB
$6.21B
| $15K | ﹤0.01% |
600
-200
| -25% | -$4.46K |
|
7130
CALL
Hydrofarm Holdings
HYFM
$3.19M
| $15K | ﹤0.01% |
1,640
+1,340
| +447% | +$12.9K |
|
|
IGMS
7131
DELISTED
IGM Biosciences
IGMS
| $15K | ﹤0.01% |
+1,810
| New | +$10.5K |
|
7132
Kayne Anderson Energy Infrastructure Fund
KYN
$2.44B
| $15K | ﹤0.01% |
1,795
-2,520
| -58% | -$21.1K |
|
7133
PUT
LivaNova
LIVN
$4.43B
| $15K | ﹤0.01% |
300
| – | – |
|
7134
CALL
Larimar Therapeutics
LRMR
$398M
| $15K | ﹤0.01% |
+3,500
| New | +$11.8K |
|
7135
CALL
Lexicon Pharmaceuticals
LXRX
$991M
| $15K | ﹤0.01% |
10,000
-21,400
| -68% | -$25.4K |
|
|
LYRA
7136
PUT
DELISTED
LYRA THERAPEUTICS INC
LYRA
| $15K | ﹤0.01% |
+60
| New | +$10.9K |
|
7137
CALL
Maravai LifeSciences
MRVI
$987M
| $15K | ﹤0.01% |
2,300
-300
| -12% | -$1.94K |
|
7138
Nomad Foods
NOMD
$1.67B
| $15K | ﹤0.01% |
+892
| New | +$13.8K |
|
|
NXDT
7139
CALL
NexPoint Diversified Real Estate Trust
NXDT
$281M
| $15K | ﹤0.01% |
2,000
-8,200
| -80% | -$67.1K |
|
7140
CALL
OP Bancorp
OPBK
$232M
| $15K | ﹤0.01% |
+1,400
| New | +$12.9K |
|
7141
PMV Pharmaceuticals
PMVP
$62.9M
| $15K | ﹤0.01% |
4,952
-34,407
| -87% | -$91K |
|
7142
CALL
RELX
RELX
$62.3B
| $15K | ﹤0.01% |
400
-500
| -56% | -$18.4K |
|
7143
CALL
Resideo Technologies
REZI
$5.34B
| $15K | ﹤0.01% |
800
+400
| +100% | +$6.55K |
|
7144
CALL
Sabesp
SBS
$19.9B
| $15K | ﹤0.01% |
5,157
-19,079
| -79% | -$48.4K |
|
7145
Neuronetics
STIM
$126M
| $15K | ﹤0.01% |
5,310
+5,188
| +4,252% | +$8.18K |
|
|
TRST
7146
PUT
Trustco Bank Corp NY
TRST
$978M
| $15K | ﹤0.01% |
500
-800
| -62% | -$22.3K |
|
7147
PUT
UDR
UDR
$12.8B
| $15K | ﹤0.01% |
400
-1,900
| -83% | -$66.1K |
|
7148
CALL
Unitil
UTL
$999M
| $15K | ﹤0.01% |
+300
| New | +$14.5K |
|
7149
ProShares Ultra Materials
UYM
$38.8M
| $15K | ﹤0.01% |
+603
| New | +$13.2K |
|
7150
CALL
VirTra
VTSI
$35.5M
| $15K | ﹤0.01% |
1,600
-3,400
| -68% | -$22.2K |
|
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.