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 | |
|---|---|---|---|---|---|---|
6701
CALL
Replimune Group
REPL
$455M
| $32K | ﹤0.01% |
4,000
-6,100
| -60% | -$50K |
|
6702
CALL
Sotera Health
SHC
$5B
| $32K | ﹤0.01% |
2,700
-5,300
| -66% | -$78.9K |
|
6703
CALL
Tootsie Roll Industries
TR
$2.97B
| $32K | ﹤0.01% |
1,064
+955
| +876% | +$28.9K |
|
6704
CALL
Taysha Gene Therapies
TSHA
$1.61B
| $32K | ﹤0.01% |
11,300
-7,900
| -41% | -$16.5K |
|
6705
CALL
Telus
TU
$17.4B
| $32K | ﹤0.01% |
2,000
-128,900
| -98% | -$2.25M |
|
6706
CALL
Universal Insurance Holdings
UVE
$1.26B
| $32K | ﹤0.01% |
1,600
-40,900
| -96% | -$736K |
|
6707
PUT
Weis Markets
WMK
$1.92B
| $32K | ﹤0.01% |
500
| – | – |
|
|
AGR
6708
CALL
DELISTED
Avangrid, Inc.
AGR
| $32K | ﹤0.01% |
900
+600
| +200% | +$19.6K |
|
|
WKME
6709
CALL
DELISTED
WalkMe Ltd. Ordinary Shares
WKME
| $32K | ﹤0.01% |
3,800
-300
| -7% | -$2.92K |
|
6710
CALL
Grupo Aeroportuario del Sureste
ASR
$8.16B
| $31K | ﹤0.01% |
+100
| New | +$29.4K |
|
6711
PUT
Delcath Systems
DCTH
$400M
| $31K | ﹤0.01% |
6,700
+1,800
| +37% | +$7.77K |
|
|
EB
6712
DELISTED
Eventbrite
EB
| $31K | ﹤0.01% |
5,733
+1,307
| +30% | +$9.48K |
|
6713
iShares MSCI Spain ETF
EWP
$2.04B
| $31K | ﹤0.01% |
968
+859
| +788% | +$25.8K |
|
6714
PUT
Goldman Sachs BDC
GSBD
$997M
| $31K | ﹤0.01% |
2,100
-2,100
| -50% | -$31.8K |
|
6715
PUT
IRIDEX
IRIX
$15M
| $31K | ﹤0.01% |
10,500
+8,400
| +400% | +$22.7K |
|
|
JBGS
6716
JBG SMITH
JBGS
$846M
| $31K | ﹤0.01% |
+1,951
| New | +$32.5K |
|
6717
PLAYSTUDIOS Inc
MYPS
$76.2M
| $31K | ﹤0.01% |
11,206
+9,858
| +731% | +$22.9K |
|
6718
PUT
OneSpaWorld
OSW
$2.64B
| $31K | ﹤0.01% |
+2,400
| New | +$32.5K |
|
6719
PUT
Outfront Media
OUT
$5.75B
| $31K | ﹤0.01% |
1,930
-6,096
| -76% | -$85.9K |
|
6720
CALL
Paysign
PAYS
$517M
| $31K | ﹤0.01% |
+8,500
| New | +$25.4K |
|
6721
Perma-Fix Environmental Services
PESI
$337M
| $31K | ﹤0.01% |
+2,666
| New | +$23K |
|
6722
ProPetro Holding
PUMP
$1.25B
| $31K | ﹤0.01% |
3,891
+2,731
| +235% | +$21.3K |
|
6723
PUT
Sprott Junior Gold Miners ETF
SGDJ
$268M
| $31K | ﹤0.01% |
+1,000
| New | +$27.8K |
|
6724
PUT
Summit Therapeutics
SMMT
$10.2B
| $31K | ﹤0.01% |
7,500
-2,500
| -25% | -$9.94K |
|
6725
PUT
Tronox
TROX
$967M
| $31K | ﹤0.01% |
1,800
-6,900
| -79% | -$100K |
|
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.