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 | |
|---|---|---|---|---|---|---|
2801
PUT
Commercial Metals
CMC
$7.59B
| $1.36M | ﹤0.01% |
23,100
+1,800
| +8% | +$95.3K |
|
2802
CALL
Unum
UNM
$13.7B
| $1.36M | ﹤0.01% |
25,300
-51,600
| -67% | -$2.52M |
|
2803
CALL
Toro Company
TTC
$9.02B
| $1.36M | ﹤0.01% |
14,800
-42,800
| -74% | -$3.95M |
|
2804
CALL
Molina Healthcare
MOH
$10.5B
| $1.35M | ﹤0.01% |
3,300
-19,900
| -86% | -$7.71M |
|
2805
PUT
Sprott Junior Uranium Miners ETF
URNJ
$322M
| $1.35M | ﹤0.01% |
30,300
-9,600
| -24% | -$248K |
|
|
SF
2806
PUT
Stifel
SF
$12.5B
| $1.35M | ﹤0.01% |
25,950
-1,800
| -6% | -$88.6K |
|
2807
BJ's Restaurants
BJRI
$1.42B
| $1.35M | ﹤0.01% |
37,353
-469
| -1% | -$16.3K |
|
2808
CALL
Manhattan Associates
MANH
$9.46B
| $1.35M | ﹤0.01% |
5,400
-30,900
| -85% | -$7.36M |
|
2809
CALL
Edison International
EIX
$30.6B
| $1.35M | ﹤0.01% |
19,100
-24,500
| -56% | -$1.67M |
|
2810
PUT
Equity Residential
EQR
$25.5B
| $1.35M | ﹤0.01% |
21,400
-33,100
| -61% | -$2.01M |
|
2811
Crown Castle
CCI
$32.3B
| $1.35M | ﹤0.01% |
12,739
+8,974
| +238% | +$976K |
|
|
HEES
2812
CALL
DELISTED
H&E Equipment Services
HEES
| $1.35M | ﹤0.01% |
21,000
+2,700
| +15% | +$148K |
|
2813
Regal Rexnord
RRX
$13.8B
| $1.34M | ﹤0.01% |
7,473
+3,043
| +69% | +$474K |
|
2814
Enovix
ENVX
$899M
| $1.34M | ﹤0.01% |
+191,897
| New | +$1.67M |
|
|
CHX
2815
PUT
DELISTED
ChampionX
CHX
| $1.34M | ﹤0.01% |
37,400
-40,600
| -52% | -$1.21M |
|
2816
CALL
Aehr Test Systems
AEHR
$2.4B
| $1.33M | ﹤0.01% |
107,600
+30,300
| +39% | +$505K |
|
2817
PUT
iRhythm Holdings
IRTC
$3.73B
| $1.33M | ﹤0.01% |
11,500
+7,500
| +188% | +$843K |
|
2818
PUT
Northern Oil and Gas
NOG
$2.22B
| $1.33M | ﹤0.01% |
33,600
-51,900
| -61% | -$1.84M |
|
2819
Landstar System
LSTR
$6.55B
| $1.33M | ﹤0.01% |
+6,912
| New | +$1.31M |
|
2820
Nokia
NOK
$50.6B
| $1.33M | ﹤0.01% |
374,675
+148,590
| +66% | +$529K |
|
2821
PUT
Sibanye-Stillwater
SBSW
$5.96B
| $1.33M | ﹤0.01% |
281,600
-29,900
| -10% | -$137K |
|
2822
PUT
Merit Medical Systems
MMSI
$4.55B
| $1.32M | ﹤0.01% |
17,500
+6,400
| +58% | +$494K |
|
2823
PUT
MannKind Corp
MNKD
$1.27B
| $1.32M | ﹤0.01% |
292,400
+207,200
| +243% | +$814K |
|
2824
Zillow
ZG
$7.25B
| $1.32M | ﹤0.01% |
+27,670
| New | +$1.46M |
|
2825
PUT
MakeMyTrip
MMYT
$4.89B
| $1.32M | ﹤0.01% |
18,600
+9,400
| +102% | +$535K |
|
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.