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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4226
US Foods
USFD
$22.5B
| $349K | ﹤0.01% |
6,473
+327
| +5% | +$16.1K |
|
4227
CALL
Quaker Houghton
KWR
$2.58B
| $348K | ﹤0.01% |
1,700
-1,900
| -53% | -$377K |
|
4228
CALL
Methanex
MEOH
$4.23B
| $348K | ﹤0.01% |
7,800
+900
| +13% | +$40.1K |
|
4229
Aemetis
AMTX
$99.2M
| $347K | ﹤0.01% |
+58,060
| New | +$220K |
|
4230
CALL
Mission Produce
AVO
$1.14B
| $347K | ﹤0.01% |
29,300
+28,200
| +2,564% | +$301K |
|
4231
ProShares UltraPro Short S&P 500
SPXU
$435M
| $347K | ﹤0.01% |
2,692
-197
| -7% | -$30K |
|
|
MRNS
4232
CALL
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $347K | ﹤0.01% |
38,400
-113,100
| -75% | -$1.1M |
|
|
RC
4233
CALL
Ready Capital
RC
$260M
| $346K | ﹤0.01% |
38,000
+21,800
| +135% | +$202K |
|
4234
PUT
Annexon
ANNX
$796M
| $344K | ﹤0.01% |
48,000
+43,800
| +1,043% | +$227K |
|
4235
Biomea Fusion
BMEA
$88.2M
| $344K | ﹤0.01% |
+23,027
| New | +$379K |
|
4236
iShares S&P 100 ETF
OEF
$19.5B
| $344K | ﹤0.01% |
1,392
+450
| +48% | +$106K |
|
4237
PUT
Onto Innovation
ONTO
$10.9B
| $344K | ﹤0.01% |
1,900
| – | – |
|
|
ONC
4238
CALL
BeOne Medicines Ltd
ONC
$33.9B
| $344K | ﹤0.01% |
2,200
+2,000
| +1,000% | +$322K |
|
|
DNMR
4239
CALL
DELISTED
Danimer Scientific, Inc.
DNMR
| $344K | ﹤0.01% |
7,893
+3,465
| +78% | +$143K |
|
4240
PUT
MasterCraft Boat Holdings
MCFT
$596M
| $343K | ﹤0.01% |
14,500
+10,000
| +222% | +$215K |
|
|
BECN
4241
PUT
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $343K | ﹤0.01% |
3,500
+300
| +9% | +$26.1K |
|
4242
CALL
Cogent Biosciences
COGT
$6.76B
| $342K | ﹤0.01% |
51,000
+25,300
| +98% | +$156K |
|
4243
CALL
Regal Rexnord
RRX
$12.5B
| $342K | ﹤0.01% |
1,900
-34,600
| -95% | -$5.39M |
|
4244
CALL
Metallus
MTUS
$833M
| $342K | ﹤0.01% |
15,400
+100
| +0.7% | +$2.08K |
|
|
SIX
4245
CALL
DELISTED
Six Flags Entertainment Corp.
SIX
| $342K | ﹤0.01% |
13,000
-42,300
| -76% | -$1.06M |
|
4246
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $341K | ﹤0.01% |
8,200
-7,800
| -49% | -$219K |
|
|
TRML
4247
PUT
DELISTED
Tourmaline Bio
TRML
| $341K | ﹤0.01% |
+14,900
| New | +$525K |
|
4248
CALL
Intrepid Potash
IPI
$476M
| $340K | ﹤0.01% |
16,300
+7,500
| +85% | +$150K |
|
4249
PUT
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.14B
| $340K | ﹤0.01% |
2,900
-12,500
| -81% | -$786K |
|
4250
Leonardo DRS
DRS
$12.4B
| $339K | ﹤0.01% |
+15,372
| New | +$319K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.