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 | |
|---|---|---|---|---|---|---|
3126
Southern Copper
SCCO
$141B
| $879K | ﹤0.01% |
11,018
+5
| +0% | +$348 |
|
|
SP
3127
DELISTED
SP Plus Corporation
SP
| $879K | ﹤0.01% |
17,152
+17,114
| +45,037% | +$858K |
|
3128
CALL
Leonardo DRS
DRS
$12.8B
| $877K | ﹤0.01% |
43,800
-89,300
| -67% | -$1.69M |
|
3129
CALL
Amprius Technologies
AMPX
$1.31B
| $876K | ﹤0.01% |
165,600
-36,000
| -18% | -$135K |
|
3130
Kinross Gold
KGC
$28.5B
| $875K | ﹤0.01% |
144,730
+114,486
| +379% | +$626K |
|
3131
CALL
PubMatic
PUBM
$581M
| $875K | ﹤0.01% |
53,700
+29,200
| +119% | +$424K |
|
3132
Waters Corp
WAT
$36.8B
| $875K | ﹤0.01% |
2,660
-369
| -12% | -$102K |
|
3133
PUT
Smith & Wesson
SWBI
$655M
| $874K | ﹤0.01% |
64,500
+50,700
| +367% | +$698K |
|
3134
Melco Resorts & Entertainment
MLCO
$2.1B
| $873K | ﹤0.01% |
98,496
+16,493
| +20% | +$134K |
|
3135
PUT
Stratasys
SSYS
$697M
| $871K | ﹤0.01% |
61,000
-12,700
| -17% | -$149K |
|
3136
CALL
MSC Industrial Direct
MSM
$7.02B
| $870K | ﹤0.01% |
8,600
-15,000
| -64% | -$1.48M |
|
3137
Gen Digital
GEN
$15.6B
| $869K | ﹤0.01% |
+38,110
| New | +$755K |
|
3138
PUT
Invesco Mortgage Capital
IVR
$776M
| $869K | ﹤0.01% |
103,400
+2,300
| +2% | +$18.8K |
|
3139
CALL
Ginkgo Bioworks
DNA
$481M
| $868K | ﹤0.01% |
13,073
+2,058
| +19% | +$126K |
|
3140
PUT
Krystal Biotech
KRYS
$9.88B
| $868K | ﹤0.01% |
7,000
+4,300
| +159% | +$477K |
|
3141
CALL
Alphatec Holdings
ATEC
$1.27B
| $865K | ﹤0.01% |
57,300
+40,700
| +245% | +$486K |
|
3142
CALL
Fortuna Silver Mines
FSM
$2.59B
| $865K | ﹤0.01% |
224,200
-68,000
| -23% | -$227K |
|
3143
PUT
CDW
CDW
$17.1B
| $863K | ﹤0.01% |
3,800
-1,300
| -25% | -$276K |
|
3144
PUT
Lear
LEA
$7.19B
| $861K | ﹤0.01% |
6,100
+3,000
| +97% | +$402K |
|
3145
Odyssey Marine Exploration
OMEX
$40.4M
| $861K | ﹤0.01% |
185,273
-156,688
| -46% | -$571K |
|
|
SOND
3146
CALL
DELISTED
Sonder
SOND
| $861K | ﹤0.01% |
254,200
-9,300
| -4% | -$53.7K |
|
3147
PUT
10x Genomics
TXG
$5.87B
| $861K | ﹤0.01% |
15,400
-4,800
| -24% | -$209K |
|
3148
Treace Medical Concepts
TMCI
$259M
| $858K | ﹤0.01% |
67,350
+66,559
| +8,415% | +$672K |
|
3149
CALL
LKQ Corp
LKQ
$6.58B
| $855K | ﹤0.01% |
17,900
+7,100
| +66% | +$331K |
|
3150
CALL
Zentalis Pharmaceuticals
ZNTL
$308M
| $855K | ﹤0.01% |
56,500
+44,500
| +371% | +$649K |
|
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.