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 | |
|---|---|---|---|---|---|---|
2226
CALL
VeriSign
VRSN
$25.3B
| $2.35M | ﹤0.01% |
11,400
-29,200
| -72% | -$6.08M |
|
2227
PUT
FLEX LNG
FLNG
$1.67B
| $2.35M | ﹤0.01% |
80,700
-16,500
| -17% | -$495K |
|
2228
CALL
Trump Media & Technology Group
DJT
$2.37B
| $2.35M | ﹤0.01% |
134,000
-50,800
| -27% | -$829K |
|
2229
CALL
Xylem
XYL
$28.5B
| $2.34M | ﹤0.01% |
20,500
-6,300
| -24% | -$629K |
|
2230
Coherent
COHR
$55.2B
| $2.34M | ﹤0.01% |
53,807
-13,370
| -20% | -$482K |
|
2231
PUT
MarketAxess Holdings
MKTX
$4.15B
| $2.34M | ﹤0.01% |
8,000
-9,000
| -53% | -$2.18M |
|
2232
CALL
Trupanion
TRUP
$1.05B
| $2.34M | ﹤0.01% |
76,700
+19,500
| +34% | +$517K |
|
|
CTLT
2233
CALL
DELISTED
CATALENT, INC.
CTLT
| $2.34M | ﹤0.01% |
52,100
-250,500
| -83% | -$10.1M |
|
2234
3M
MMM
$89B
| $2.33M | ﹤0.01% |
25,537
-57,455
| -69% | -$4.61M |
|
2235
CALL
Bloomin' Brands
BLMN
$680M
| $2.33M | ﹤0.01% |
82,900
-6,400
| -7% | -$156K |
|
2236
CALL
Medpace
MEDP
$16.8B
| $2.33M | ﹤0.01% |
7,600
+7,000
| +1,167% | +$1.89M |
|
2237
CALL
Telus
TU
$16B
| $2.33M | ﹤0.01% |
130,900
+102,300
| +358% | +$1.77M |
|
2238
PUT
GlobalFoundries
GFS
$29.4B
| $2.33M | ﹤0.01% |
38,400
-9,100
| -19% | -$504K |
|
|
CPE
2239
PUT
DELISTED
Callon Petroleum Company
CPE
| $2.33M | ﹤0.01% |
71,800
+3,300
| +5% | +$113K |
|
2240
CALL
LCI Industries
LCII
$2.51B
| $2.33M | ﹤0.01% |
18,500
+16,700
| +928% | +$1.92M |
|
2241
CALL
PureCycle Technologies
PCT
$1.17B
| $2.32M | ﹤0.01% |
573,200
+222,600
| +63% | +$978K |
|
2242
PUT
Silicon Laboratories
SLAB
$7.15B
| $2.31M | ﹤0.01% |
17,500
+5,000
| +40% | +$547K |
|
2243
CALL
United Therapeutics
UTHR
$26.3B
| $2.31M | ﹤0.01% |
10,500
+7,700
| +275% | +$1.77M |
|
2244
CALL
Lithia Motors
LAD
$7.78B
| $2.3M | ﹤0.01% |
7,000
-43,200
| -86% | -$11.9M |
|
|
ZIMV
2245
CALL
DELISTED
ZimVie
ZIMV
| $2.3M | ﹤0.01% |
129,500
+126,000
| +3,600% | +$1.27M |
|
2246
PUT
Tanger
SKT
$4.82B
| $2.3M | ﹤0.01% |
82,900
+3,000
| +4% | +$74.7K |
|
2247
CALL
Cipher Digital
CIFR
$9.47B
| $2.29M | ﹤0.01% |
555,000
+459,800
| +483% | +$1.4M |
|
2248
PUT
Baker Hughes
BKR
$56.8B
| $2.29M | ﹤0.01% |
66,900
+29,800
| +80% | +$1.02M |
|
2249
PUT
Hyatt Hotels
H
$17.6B
| $2.28M | ﹤0.01% |
17,500
-14,800
| -46% | -$1.68M |
|
|
CHX
2250
PUT
DELISTED
ChampionX
CHX
| $2.28M | ﹤0.01% |
78,000
-26,700
| -26% | -$826K |
|
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.