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 | |
|---|---|---|---|---|---|---|
6226
PUT
Matsons
MATX
$6.11B
| $43K | ﹤0.01% |
400
-500
| -56% | -$47.5K |
|
6227
CALL
Malibu Boats
MBUU
$548M
| $43K | ﹤0.01% |
800
-800
| -50% | -$38.4K |
|
6228
CALL
MacroGenics
MGNX
$233M
| $43K | ﹤0.01% |
+4,500
| New | +$31.1K |
|
6229
PUT
MeiraGTx Holdings
MGTX
$1.08B
| $43K | ﹤0.01% |
+6,200
| New | +$30.6K |
|
6230
MoneyHero
MNY
$41.9M
| $43K | ﹤0.01% |
+25,395
| New | +$50.4K |
|
6231
Ribbon Communications
RBBN
$386M
| $43K | ﹤0.01% |
15,156
+4,397
| +41% | +$9.91K |
|
6232
iShares MSCI India Small-Cap ETF
SMIN
$750M
| $43K | ﹤0.01% |
+618
| New | +$40.5K |
|
6233
Spire Global
SPIR
$408M
| $43K | ﹤0.01% |
+5,604
| New | +$28.7K |
|
6234
ProShares UltraShort Real Estate
SRS
$14.8M
| $43K | ﹤0.01% |
771
-1,623
| -68% | -$121K |
|
|
TSVT
6235
CALL
DELISTED
2seventy bio
TSVT
| $43K | ﹤0.01% |
10,200
+7,200
| +240% | +$22.1K |
|
6236
PUT
Vertex
VERX
$2.16B
| $43K | ﹤0.01% |
1,600
+800
| +100% | +$20.5K |
|
|
EDR
6237
DELISTED
Endeavor Group Holdings, Inc.
EDR
| $43K | ﹤0.01% |
1,827
-143,331
| -99% | -$3.23M |
|
|
WKME
6238
CALL
DELISTED
WalkMe Ltd. Ordinary Shares
WKME
| $43K | ﹤0.01% |
4,100
+1,800
| +78% | +$17K |
|
|
AIV
6239
CALL
Aimco
AIV
$377M
| $42K | ﹤0.01% |
5,400
-11,100
| -67% | -$74.9K |
|
6240
CALL
BOK Financial
BOKF
$8.58B
| $42K | ﹤0.01% |
500
-1,100
| -69% | -$83K |
|
6241
CALL
Americold
COLD
$4.21B
| $42K | ﹤0.01% |
1,400
-200
| -13% | -$5.59K |
|
6242
iShares MSCI EAFE Min Vol Factor ETF
EFAV
$5.35B
| $42K | ﹤0.01% |
619
+363
| +142% | +$24.1K |
|
6243
Empire State Realty Trust
ESRT
$1B
| $42K | ﹤0.01% |
4,338
+1,346
| +45% | +$11.7K |
|
|
GAMB
6244
PUT
DELISTED
Gambling.com
GAMB
| $42K | ﹤0.01% |
4,400
+4,100
| +1,367% | +$47.7K |
|
|
GPMT
6245
CALL
Granite Point Mortgage Trust
GPMT
$63.7M
| $42K | ﹤0.01% |
7,100
+2,100
| +42% | +$10.6K |
|
6246
PUT
Gran Tierra Energy
GTE
$236M
| $42K | ﹤0.01% |
7,600
-14,700
| -66% | -$91.4K |
|
6247
CALL
Haverty Furniture Companies
HVT
$418M
| $42K | ﹤0.01% |
+1,200
| New | +$36.7K |
|
6248
CALL
James Hardie Industries
JHX
$15.2B
| $42K | ﹤0.01% |
+1,100
| New | +$33K |
|
6249
Kamada
KMDA
$404M
| $42K | ﹤0.01% |
+7,005
| New | +$35.3K |
|
6250
Legend Biotech
LEGN
$3.65B
| $42K | ﹤0.01% |
+704
| New | +$44.6K |
|
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.