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 | |
|---|---|---|---|---|---|---|
3776
CALL
FuelCell Energy
FCEL
$1.57B
| $542K | ﹤0.01% |
15,190
-2,397
| -14% | -$88.4K |
|
3777
CALL
Timken Company
TKR
$9.72B
| $542K | ﹤0.01% |
6,200
+200
| +3% | +$16.5K |
|
|
SBOW
3778
CALL
DELISTED
SilverBow Resources, Inc.
SBOW
| $542K | ﹤0.01% |
15,900
-1,700
| -10% | -$49.4K |
|
|
MDC
3779
DELISTED
M.D.C. Holdings, Inc.
MDC
| $542K | ﹤0.01% |
8,631
+2,800
| +48% | +$171K |
|
3780
Ameren
AEE
$31.1B
| $541K | ﹤0.01% |
7,321
-7,427
| -50% | -$528K |
|
|
MZTI
3781
CALL
The Marzetti Company
MZTI
$3.02B
| $539K | ﹤0.01% |
2,600
+2,100
| +420% | +$400K |
|
3782
CALL
Triumph Financial Inc
TFIN
$1.84B
| $539K | ﹤0.01% |
6,800
-2,900
| -30% | -$219K |
|
|
ETNB
3783
PUT
DELISTED
89bio
ETNB
| $538K | ﹤0.01% |
46,300
-55,400
| -54% | -$613K |
|
3784
PUT
Veeco
VECO
$2.79B
| $538K | ﹤0.01% |
15,300
+4,700
| +44% | +$157K |
|
3785
CALL
Acuity Brands
AYI
$10.3B
| $537K | ﹤0.01% |
2,000
| – | – |
|
3786
CALL
Donaldson
DCI
$11.1B
| $537K | ﹤0.01% |
7,200
+1,400
| +24% | +$95.2K |
|
3787
CALL
GDS Holdings
GDS
$6.14B
| $537K | ﹤0.01% |
80,800
-11,100
| -12% | -$75.2K |
|
3788
CALL
HighPeak Energy
HPK
$812M
| $537K | ﹤0.01% |
34,100
+11,600
| +52% | +$172K |
|
3789
CALL
Inspired Entertainment
INSE
$188M
| $537K | ﹤0.01% |
54,500
+46,000
| +541% | +$429K |
|
3790
Schrodinger
SDGR
$1.14B
| $537K | ﹤0.01% |
19,922
+14,246
| +251% | +$398K |
|
3791
SIGA Technologies
SIGA
$240M
| $537K | ﹤0.01% |
62,756
-34,239
| -35% | -$195K |
|
3792
CALL
Astrana Health
ASTH
$1.88B
| $537K | ﹤0.01% |
+12,800
| New | +$499K |
|
|
ONC
3793
BeOne Medicines Ltd
ONC
$34.3B
| $537K | ﹤0.01% |
+3,439
| New | +$554K |
|
3794
UGI
UGI
$7.92B
| $536K | ﹤0.01% |
21,843
-91,528
| -81% | -$2.2M |
|
3795
Logitech
LOGI
$16B
| $535K | ﹤0.01% |
5,988
+5,925
| +9,405% | +$529K |
|
3796
Direxion Daily Small Cap Bear 3x ETF
TZA
$245M
| $535K | ﹤0.01% |
3,190
-6,709
| -68% | -$1.36M |
|
|
AMED
3797
PUT
DELISTED
Amedisys
AMED
| $534K | ﹤0.01% |
5,800
-500
| -8% | -$46.9K |
|
3798
GraniteShares 2x Long COIN Daily ETF
CONL
$534M
| $533K | ﹤0.01% |
+6,956
| New | +$284K |
|
3799
Harmonic Inc
HLIT
$1.2B
| $533K | ﹤0.01% |
+39,662
| New | +$506K |
|
3800
PUT
Mettler-Toledo International
MTD
$28.1B
| $532K | ﹤0.01% |
+400
| New | +$493K |
|
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.