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 | |
|---|---|---|---|---|---|---|
|
SCS
5001
PUT
DELISTED
Steelcase
SCS
| $146K | ﹤0.01% |
10,800
-7,600
| -41% | -$90.2K |
|
5002
CALL
SiteOne Landscape Supply
SITE
$4.15B
| $146K | ﹤0.01% |
+900
| New | +$131K |
|
|
GDEN
5003
DELISTED
Golden Entertainment
GDEN
| $145K | ﹤0.01% |
+3,645
| New | +$132K |
|
5004
PUT
LoveSac
LOVE
$236M
| $145K | ﹤0.01% |
5,700
-2,900
| -34% | -$58.1K |
|
|
NKLA
5005
DELISTED
Nikola Corporation Common Stock
NKLA
| $145K | ﹤0.01% |
5,560
-6,130
| -52% | -$190K |
|
5006
CALL
Cimpress
CMPR
$2.29B
| $144K | ﹤0.01% |
1,800
-1,100
| -38% | -$76.6K |
|
5007
CNX Resources
CNX
$4.9B
| $144K | ﹤0.01% |
7,240
-7,101
| -50% | -$151K |
|
5008
GATX Corp
GATX
$6.45B
| $144K | ﹤0.01% |
+1,205
| New | +$133K |
|
|
LTC
5009
PUT
LTC Properties
LTC
$2.06B
| $144K | ﹤0.01% |
4,500
-7,700
| -63% | -$249K |
|
|
PLL
5010
DELISTED
Piedmont Lithium
PLL
| $144K | ﹤0.01% |
+5,118
| New | +$150K |
|
5011
PUT
Return Stacked Bonds & Managed Futures ETF
RSBT
$135M
| $144K | ﹤0.01% |
8,200
+8,100
| +8,100% | +$142K |
|
|
ASTR
5012
DELISTED
Astra Space, Inc. Class A Common Stock
ASTR
| $144K | ﹤0.01% |
63,250
+59,605
| +1,635% | +$71.8K |
|
|
BAND
5013
CALL
Bandwidth Inc
BAND
$1.25B
| $143K | ﹤0.01% |
9,900
-11,500
| -54% | -$134K |
|
5014
PUT
Donaldson
DCI
$10.7B
| $143K | ﹤0.01% |
+2,200
| New | +$134K |
|
|
DSL
5015
CALL
DoubleLine Income Solutions Fund
DSL
$1.23B
| $143K | ﹤0.01% |
11,700
+2,100
| +22% | +$24.2K |
|
|
DX
5016
Dynex Capital
DX
$3.18B
| $143K | ﹤0.01% |
+11,469
| New | +$131K |
|
5017
CALL
Factset
FDS
$9.35B
| $143K | ﹤0.01% |
300
-12,800
| -98% | -$5.76M |
|
5018
CALL
NCR Atleos
NATL
$3.46B
| $143K | ﹤0.01% |
+5,900
| New | +$135K |
|
5019
CALL
New Fortress Energy
NFE
$94.6M
| $143K | ﹤0.01% |
3,800
-25,700
| -87% | -$886K |
|
5020
CALL
SkinHealth Systems
SKIN
$87.6M
| $143K | ﹤0.01% |
46,000
-13,100
| -22% | -$49.2K |
|
5021
PUT
Amphastar Pharmaceuticals
AMPH
$899M
| $142K | ﹤0.01% |
2,300
+1,800
| +360% | +$94.6K |
|
5022
PUT
Encore Capital Group
ECPG
$2.02B
| $142K | ﹤0.01% |
2,800
+2,700
| +2,700% | +$122K |
|
5023
Future Fuel
FF
$218M
| $142K | ﹤0.01% |
23,384
+17,491
| +297% | +$112K |
|
5024
CALL
Green Dot
GDOT
$743M
| $142K | ﹤0.01% |
14,400
+14,200
| +7,100% | +$148K |
|
5025
PUT
Main Street Capital
MAIN
$5.06B
| $142K | ﹤0.01% |
3,300
+300
| +10% | +$12.3K |
|
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.