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 | |
|---|---|---|---|---|---|---|
4051
Kratos Defense & Security Solutions
KTOS
$8.23B
| $408K | ﹤0.01% |
+22,200
| New | +$404K |
|
|
LNW
4052
PUT
DELISTED
Light & Wonder
LNW
| $408K | ﹤0.01% |
4,000
+2,400
| +150% | +$217K |
|
4053
PUT
BigBear.ai
BBAI
$1.24B
| $406K | ﹤0.01% |
198,400
-228,200
| -53% | -$505K |
|
4054
CALL
NGL Energy Partners
NGL
$1.94B
| $406K | ﹤0.01% |
70,600
+18,300
| +35% | +$104K |
|
4055
CALL
NETGEAR
NTGR
$612M
| $406K | ﹤0.01% |
25,800
-20,000
| -44% | -$291K |
|
4056
CorMedix
CRMD
$564M
| $405K | ﹤0.01% |
95,540
+66,354
| +227% | +$230K |
|
4057
PUT
Iridium Communications
IRDM
$4.7B
| $405K | ﹤0.01% |
15,500
-4,300
| -22% | -$140K |
|
|
OBE
4058
CALL
Obsidian Energy
OBE
$656M
| $405K | ﹤0.01% |
49,300
+29,500
| +149% | +$206K |
|
4059
CALL
Gildan
GIL
$9.49B
| $404K | ﹤0.01% |
10,900
+10,400
| +2,080% | +$353K |
|
4060
Newell Brands
NWL
$2.21B
| $404K | ﹤0.01% |
50,373
+22,854
| +83% | +$182K |
|
4061
PUT
PRA Group
PRAA
$672M
| $404K | ﹤0.01% |
15,500
+4,400
| +40% | +$107K |
|
4062
PUT
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.37B
| $404K | ﹤0.01% |
8,100
+5,800
| +252% | +$285K |
|
4063
PUT
Universal Insurance Holdings
UVE
$1.26B
| $404K | ﹤0.01% |
19,900
+19,800
| +19,800% | +$357K |
|
4064
iShares MSCI Hong Kong ETF
EWH
$1.23B
| $403K | ﹤0.01% |
25,959
-20,423
| -44% | -$330K |
|
4065
CALL
GFL Environmental
GFL
$14.5B
| $403K | ﹤0.01% |
11,700
-3,700
| -24% | -$128K |
|
4066
CALL
Icon
ICLR
$13.7B
| $403K | ﹤0.01% |
1,200
| – | – |
|
4067
PUT
Scholastic
SCHL
$774M
| $403K | ﹤0.01% |
10,700
+9,000
| +529% | +$345K |
|
4068
PUT
Astrana Health
ASTH
$1.81B
| $403K | ﹤0.01% |
9,600
+3,300
| +52% | +$129K |
|
4069
C4 Therapeutics
CCCC
$389M
| $402K | ﹤0.01% |
49,269
-45,751
| -48% | -$355K |
|
|
NNDM
4070
CALL
Nano Dimension
NNDM
$314M
| $402K | ﹤0.01% |
144,700
-190,700
| -57% | -$491K |
|
|
AL
4071
PUT
DELISTED
Air Lease Corp
AL
| $401K | ﹤0.01% |
7,800
+7,200
| +1,200% | +$308K |
|
4072
CALL
Calix
CALX
$2.24B
| $401K | ﹤0.01% |
12,100
-57,200
| -83% | -$2.13M |
|
|
ATSG
4073
CALL
DELISTED
Air Transport Services Group
ATSG
| $401K | ﹤0.01% |
+29,200
| New | +$421K |
|
4074
PUT
Aspen Aerogels
ASPN
$339M
| $399K | ﹤0.01% |
22,700
+18,300
| +416% | +$270K |
|
4075
CALL
Immatics
IMTX
$1.23B
| $398K | ﹤0.01% |
37,900
+27,400
| +261% | +$320K |
|
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.