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 | |
|---|---|---|---|---|---|---|
3151
CALL
Fulcrum Therapeutics
FULC
$249M
| $971K | ﹤0.01% |
102,900
+82,600
| +407% | +$737K |
|
3152
CALL
United Microelectronic
UMC
$47.9B
| $971K | ﹤0.01% |
120,100
+14,200
| +13% | +$113K |
|
3153
PUT
Vera Therapeutics
VERA
$2.53B
| $970K | ﹤0.01% |
22,500
+22,400
| +22,400% | +$798K |
|
|
INFN
3154
CALL
DELISTED
Infinera Corporation Common Stock
INFN
| $970K | ﹤0.01% |
161,000
+144,600
| +882% | +$726K |
|
3155
CALL
Medpace
MEDP
$16.5B
| $969K | ﹤0.01% |
2,400
-5,200
| -68% | -$1.83M |
|
3156
iShares Russell 1000 Growth ETF
IWF
$120B
| $966K | ﹤0.01% |
11,472
-41,340
| -78% | -$3.33M |
|
3157
RingCentral
RNG
$4.5B
| $966K | ﹤0.01% |
27,835
+24,863
| +837% | +$837K |
|
3158
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$269M
| $964K | ﹤0.01% |
16,700
-45,500
| -73% | -$2.73M |
|
3159
PUT
Murphy USA
MUSA
$11.3B
| $964K | ﹤0.01% |
2,300
+300
| +15% | +$117K |
|
3160
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$294M
| $964K | ﹤0.01% |
29,273
-260,588
| -90% | -$8.64M |
|
3161
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$177M
| $964K | ﹤0.01% |
28,789
+19,535
| +211% | +$661K |
|
3162
CALL
CubeSmart
CUBE
$9.57B
| $963K | ﹤0.01% |
21,300
+500
| +2% | +$22.2K |
|
3163
PUT
NovoCure
NVCR
$1.97B
| $962K | ﹤0.01% |
61,600
-2,100
| -3% | -$30.9K |
|
3164
CALL
Pinnacle Financial Partners Inc
PNFP
$15.6B
| $961K | ﹤0.01% |
11,200
-51,600
| -82% | -$4.34M |
|
3165
Mid-America Apartment Communities
MAA
$15.5B
| $959K | ﹤0.01% |
7,294
-79
| -1% | -$10.3K |
|
3166
CALL
Rush Enterprises Class A
RUSHA
$5.98B
| $958K | ﹤0.01% |
17,900
+12,300
| +220% | +$581K |
|
3167
Waste Management
WM
$95.5B
| $956K | ﹤0.01% |
4,488
-7,360
| -62% | -$1.45M |
|
|
ALTR
3168
CALL
DELISTED
Altair Engineering Inc
ALTR
| $956K | ﹤0.01% |
11,100
-3,700
| -25% | -$314K |
|
3169
CALL
Photronics
PLAB
$1.76B
| $954K | ﹤0.01% |
33,700
+29,700
| +743% | +$884K |
|
3170
Telephone and Data Systems
TDS
$3.83B
| $954K | ﹤0.01% |
59,580
-16,211
| -21% | -$277K |
|
3171
PUT
USA Compression Partners
USAC
$3.72B
| $954K | ﹤0.01% |
35,800
-55,200
| -61% | -$1.4M |
|
3172
PUT
Magna International
MGA
$18.3B
| $953K | ﹤0.01% |
17,500
-14,800
| -46% | -$817K |
|
3173
PUT
Seadrill
SDRL
$2.69B
| $950K | ﹤0.01% |
18,900
+17,900
| +1,790% | +$813K |
|
3174
PUT
XPEL
XPEL
$1.18B
| $950K | ﹤0.01% |
17,600
+10,800
| +159% | +$566K |
|
3175
Sweetgreen
SG
$733M
| $949K | ﹤0.01% |
37,588
+35,500
| +1,700% | +$517K |
|
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.