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 | |
|---|---|---|---|---|---|---|
4751
CALL
Tradeweb Markets
TW
$20.8B
| $218K | ﹤0.01% |
2,100
-600
| -22% | -$60.3K |
|
|
YALA
4752
PUT
Yalla Group
YALA
$817M
| $218K | ﹤0.01% |
45,400
+6,200
| +16% | +$31.9K |
|
4753
CALL
Ethan Allen Interiors
ETD
$583M
| $217K | ﹤0.01% |
6,300
+2,500
| +66% | +$78.3K |
|
|
DMC
4754
PUT
Del Monte Corp
DMC
$1.41B
| $217K | ﹤0.01% |
8,400
+6,900
| +460% | +$171K |
|
|
PRA
4755
DELISTED
ProAssurance
PRA
| $217K | ﹤0.01% |
+16,887
| New | +$217K |
|
4756
ProShares UltraShort QQQ
QID
$285M
| $217K | ﹤0.01% |
+4,850
| New | +$236K |
|
|
RGLS
4757
DELISTED
Regulus Therapeutics
RGLS
| $217K | ﹤0.01% |
+75,450
| New | +$123K |
|
4758
Relmada Therapeutics
RLMD
$562M
| $217K | ﹤0.01% |
46,713
-9,272
| -17% | -$44.7K |
|
|
TCN
4759
PUT
DELISTED
Tricon Residential Inc.
TCN
| $217K | ﹤0.01% |
19,500
+18,200
| +1,400% | +$194K |
|
4760
CALL
Axalta
AXTA
$7.71B
| $216K | ﹤0.01% |
6,300
+2,700
| +75% | +$88.2K |
|
4761
PUT
Globalstar
GSAT
$10.3B
| $216K | ﹤0.01% |
9,827
-8,560
| -47% | -$207K |
|
4762
CALL
Alliant Energy
LNT
$18.3B
| $216K | ﹤0.01% |
4,300
+1,200
| +39% | +$58.9K |
|
4763
PUT
Calix
CALX
$2.22B
| $215K | ﹤0.01% |
6,500
+4,100
| +171% | +$153K |
|
4764
PUT
Pacer Trendpilot US Large Cap ETF
PTLC
$3.24B
| $215K | ﹤0.01% |
4,300
-800
| -16% | -$36.3K |
|
4765
Invesco DB US Dollar Index Bearish Fund
UDN
$109M
| $215K | ﹤0.01% |
11,998
-7,837
| -40% | -$142K |
|
4766
PUT
Ameren
AEE
$30.1B
| $214K | ﹤0.01% |
2,900
-58,600
| -95% | -$4.17M |
|
4767
Braze
BRZE
$2.82B
| $214K | ﹤0.01% |
4,836
+1,982
| +69% | +$107K |
|
|
DESP
4768
PUT
DELISTED
Despegar.com
DESP
| $214K | ﹤0.01% |
17,900
+7,800
| +77% | +$73.9K |
|
|
MGIC
4769
DELISTED
Magic Software Enterprises
MGIC
| $214K | ﹤0.01% |
+18,737
| New | +$202K |
|
4770
New Fortress Energy
NFE
$94.6M
| $214K | ﹤0.01% |
7,005
-9,726
| -58% | -$319K |
|
|
PBT
4771
PUT
Permian Basin Royalty Trust
PBT
$1.39B
| $214K | ﹤0.01% |
17,700
+15,100
| +581% | +$205K |
|
4772
Paylocity
PCTY
$7.32B
| $214K | ﹤0.01% |
+1,247
| New | +$206K |
|
4773
PUT
Paysafe
PSFE
$434M
| $214K | ﹤0.01% |
13,600
-15,000
| -52% | -$210K |
|
4774
iShares 1-3 Year Treasury Bond ETF
SHY
$25.5B
| $214K | ﹤0.01% |
+2,629
| New | +$215K |
|
4775
Sterling Infrastructure
STRL
$17.8B
| $214K | ﹤0.01% |
+1,940
| New | +$176K |
|
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.