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 | |
|---|---|---|---|---|---|---|
3851
Scholar Rock
SRRK
$5.92B
| $506K | ﹤0.01% |
28,513
+26,381
| +1,237% | +$415K |
|
|
HIBB
3852
PUT
DELISTED
Hibbett, Inc. Common Stock
HIBB
| $506K | ﹤0.01% |
6,600
+2,200
| +50% | +$158K |
|
|
LSEA
3853
CALL
DELISTED
Landsea Homes
LSEA
| $505K | ﹤0.01% |
34,800
+34,300
| +6,860% | +$432K |
|
3854
Saia
SAIA
$10.9B
| $504K | ﹤0.01% |
863
-2,016
| -70% | -$1.06M |
|
3855
PUT
Viasat
VSAT
$10.2B
| $504K | ﹤0.01% |
27,900
+700
| +3% | +$14.7K |
|
3856
CALL
SkinHealth Systems
SKIN
$90.5M
| $503K | ﹤0.01% |
113,300
+67,300
| +146% | +$219K |
|
3857
PUT
Silicon Laboratories
SLAB
$7.17B
| $503K | ﹤0.01% |
3,500
-14,000
| -80% | -$1.86M |
|
3858
PUT
SLM Corp
SLM
$4.74B
| $503K | ﹤0.01% |
23,100
+10,200
| +79% | +$203K |
|
3859
PUT
BWX Technologies
BWXT
$15.5B
| $502K | ﹤0.01% |
4,900
-26,600
| -84% | -$2.38M |
|
3860
PUT
Newell Brands
NWL
$2.24B
| $502K | ﹤0.01% |
62,600
-32,100
| -34% | -$256K |
|
|
TSVT
3861
PUT
DELISTED
2seventy bio
TSVT
| $502K | ﹤0.01% |
93,900
+9,400
| +11% | +$44.2K |
|
3862
CALL
Alkami Technology
ALKT
$1.94B
| $501K | ﹤0.01% |
20,400
+5,000
| +32% | +$123K |
|
3863
PUT
Credo Technology Group
CRDO
$35.9B
| $500K | ﹤0.01% |
23,600
+20,400
| +638% | +$427K |
|
3864
Klaviyo
KVYO
$5.65B
| $500K | ﹤0.01% |
19,646
+1,687
| +9% | +$45.1K |
|
3865
PUT
Teekay
TK
$981M
| $500K | ﹤0.01% |
68,700
+53,700
| +358% | +$421K |
|
3866
PUT
Vista Energy
VIST
$7.16B
| $500K | ﹤0.01% |
12,100
+7,000
| +137% | +$243K |
|
3867
CALL
Vanguard Total International Stock ETF
VXUS
$153B
| $500K | ﹤0.01% |
8,300
+5,200
| +168% | +$303K |
|
|
EQC
3868
DELISTED
Equity Commonwealth
EQC
| $499K | ﹤0.01% |
+26,468
| New | +$503K |
|
3869
CALL
Ocular Therapeutix
OCUL
$1.85B
| $498K | ﹤0.01% |
54,800
+41,400
| +309% | +$294K |
|
3870
CALL
ZTO Express
ZTO
$18.2B
| $498K | ﹤0.01% |
23,800
-93,100
| -80% | -$1.78M |
|
3871
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$7.06B
| $497K | ﹤0.01% |
+5,229
| New | +$495K |
|
3872
CALL
Ryanair
RYAAY
$31B
| $495K | ﹤0.01% |
8,500
+4,000
| +89% | +$217K |
|
3873
CALL
Walker & Dunlop
WD
$1.75B
| $495K | ﹤0.01% |
4,900
-2,300
| -32% | -$221K |
|
|
CPRX
3874
PUT
DELISTED
Catalyst Pharmaceutical
CPRX
| $494K | ﹤0.01% |
+31,000
| New | +$467K |
|
3875
Liberty Media Series C
FWONK
$25.4B
| $494K | ﹤0.01% |
+7,541
| New | +$506K |
|
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.