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 | |
|---|---|---|---|---|---|---|
6201
Power Integrations
POWI
$3.15B
| $44K | ﹤0.01% |
547
+168
| +44% | +$12.9K |
|
6202
CALL
Rexford Industrial Realty
REXR
$8.63B
| $44K | ﹤0.01% |
800
-2,800
| -78% | -$137K |
|
6203
Gibraltar Industries
ROCK
$1.28B
| $44K | ﹤0.01% |
+566
| New | +$38.7K |
|
|
SLNO
6204
CALL
DELISTED
Soleno Therapeutics
SLNO
| $44K | ﹤0.01% |
+1,100
| New | +$31.3K |
|
6205
Star Holdings Shares of Beneficial Interest
STHO
$112M
| $44K | ﹤0.01% |
2,975
+611
| +26% | +$7.62K |
|
6206
PUT
Teledyne Technologies
TDY
$29.2B
| $44K | ﹤0.01% |
100
-100
| -50% | -$40.1K |
|
6207
Interface
TILE
$1.95B
| $44K | ﹤0.01% |
3,555
-1,925
| -35% | -$19.7K |
|
6208
PUT
Wheels Up
UP
$203M
| $44K | ﹤0.01% |
740
+440
| +147% | +$17K |
|
6209
CALL
VOC Energy
VOC
$56.4M
| $44K | ﹤0.01% |
6,200
-9,900
| -61% | -$82.9K |
|
6210
PUT
John Wiley & Sons Class A
WLY
$2.83B
| $44K | ﹤0.01% |
1,400
-200
| -13% | -$6.25K |
|
|
IRD
6211
CALL
Opus Genetics
IRD
$287M
| $44K | ﹤0.01% |
14,900
-10,100
| -40% | -$29.9K |
|
|
WE
6212
DELISTED
WeWork Inc.
WE
| $44K | ﹤0.01% |
+160,900
| New | +$344K |
|
6213
Amalgamated Financial
AMAL
$1.47B
| $43K | ﹤0.01% |
+1,630
| New | +$33.5K |
|
6214
PUT
American Homes 4 Rent
AMH
$12.1B
| $43K | ﹤0.01% |
1,200
+800
| +200% | +$27.9K |
|
6215
CALL
Aqua Metals
AQMS
$9.78M
| $43K | ﹤0.01% |
284
| – | – |
|
6216
Encore Capital Group
ECPG
$2.01B
| $43K | ﹤0.01% |
859
+805
| +1,491% | +$36.5K |
|
6217
CALL
FB Financial Corp
FBK
$2.98B
| $43K | ﹤0.01% |
1,100
+100
| +10% | +$3.31K |
|
6218
CALL
Cedar Fair
FUN
$1.88B
| $43K | ﹤0.01% |
1,100
-600
| -35% | -$22.6K |
|
6219
PUT
Graco
GGG
$13.2B
| $43K | ﹤0.01% |
500
-700
| -58% | -$55K |
|
6220
Heartland Express
HTLD
$1.01B
| $43K | ﹤0.01% |
3,028
+239
| +9% | +$3.27K |
|
6221
iShares US Financial Services ETF
IYG
$2.13B
| $43K | ﹤0.01% |
+735
| New | +$39.6K |
|
6222
PUT
Kite Realty
KRG
$5.86B
| $43K | ﹤0.01% |
+1,900
| New | +$40.6K |
|
6223
CALL
Lincoln Electric
LECO
$14.1B
| $43K | ﹤0.01% |
200
-700
| -78% | -$135K |
|
|
6224
PUT
Lincoln Electric
LECO
$14.1B
| $43K | ﹤0.01% |
200
-900
| -82% | -$174K |
|
6225
Lindblad Expeditions
LIND
$1.95B
| $43K | ﹤0.01% |
3,890
+3,803
| +4,371% | +$29.5K |
|
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.