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 | |
|---|---|---|---|---|---|---|
3251
Revvity
RVTY
$12.1B
| $878K | ﹤0.01% |
+8,371
| New | +$891K |
|
|
DCH
3252
CALL
Dauch Corp
DCH
$1.32B
| $877K | ﹤0.01% |
119,200
-21,200
| -15% | -$160K |
|
|
CCC
3253
PUT
CCC Intelligent Solutions
CCC
$3.5B
| $877K | ﹤0.01% |
73,400
-700
| -0.9% | -$7.98K |
|
3254
PUT
Rentokil
RTO
$14.4B
| $877K | ﹤0.01% |
+29,100
| New | +$807K |
|
3255
PUT
Skywest
SKYW
$4.37B
| $877K | ﹤0.01% |
12,700
-67,500
| -84% | -$4M |
|
3256
CALL
Ascendis Pharma A/S
ASND
$16.6B
| $876K | ﹤0.01% |
5,800
+5,200
| +867% | +$742K |
|
3257
CALL
Glaukos
GKOS
$8.92B
| $876K | ﹤0.01% |
9,300
-900
| -9% | -$80.4K |
|
3258
CALL
Dorian LPG
LPG
$1.88B
| $876K | ﹤0.01% |
22,800
+12,800
| +128% | +$493K |
|
|
TBCH
3259
CALL
Turtle Beach Corp
TBCH
$245M
| $874K | ﹤0.01% |
50,700
+6,200
| +14% | +$74.9K |
|
3260
PUT
Harmony Biosciences
HRMY
$2.08B
| $873K | ﹤0.01% |
26,000
+23,200
| +829% | +$745K |
|
3261
CALL
ProShares UltraShort Industrials
SIJ
$5.69M
| $873K | ﹤0.01% |
9,250
+4,975
| +116% | +$214K |
|
3262
Direxion Daily Real Estate Bull 3X ETF
DRN
$48M
| $872K | ﹤0.01% |
88,103
+49,873
| +130% | +$475K |
|
|
AXNX
3263
CALL
DELISTED
Axonics, Inc. Common Stock
AXNX
| $869K | ﹤0.01% |
12,600
+8,200
| +186% | +$553K |
|
3264
CALL
Atlas Energy Solutions
AESI
$1.43B
| $868K | ﹤0.01% |
38,400
-15,700
| -29% | -$293K |
|
|
DVAX
3265
DELISTED
Dynavax Technologies
DVAX
| $868K | ﹤0.01% |
+69,991
| New | +$913K |
|
3266
Assured Guaranty
AGO
$3.78B
| $867K | ﹤0.01% |
9,937
+3,855
| +63% | +$325K |
|
3267
CALL
Jazz Pharmaceuticals
JAZZ
$16B
| $867K | ﹤0.01% |
7,200
-4,600
| -39% | -$563K |
|
3268
PUT
NextDecade
NEXT
$1.7B
| $867K | ﹤0.01% |
152,800
+148,300
| +3,296% | +$741K |
|
|
INBX
3269
PUT
DELISTED
Inhibrx, Inc. Common Stock
INBX
| $867K | ﹤0.01% |
24,800
+19,400
| +359% | +$707K |
|
3270
PUT
Buckle
BKE
$2.25B
| $865K | ﹤0.01% |
21,500
+5,600
| +35% | +$220K |
|
3271
CALL
Krispy Kreme
DNUT
$562M
| $865K | ﹤0.01% |
56,800
+46,200
| +436% | +$617K |
|
3272
CALL
Weibo
WB
$1.92B
| $865K | ﹤0.01% |
95,200
+22,900
| +32% | +$208K |
|
3273
CALL
Fox Factory Holding Corp
FOXF
$779M
| $864K | ﹤0.01% |
16,600
+12,400
| +295% | +$731K |
|
3274
PUT
MKS Inc
MKSI
$21.3B
| $864K | ﹤0.01% |
6,500
+1,400
| +27% | +$163K |
|
3275
PUT
New York Times
NYT
$11.7B
| $864K | ﹤0.01% |
20,000
-16,500
| -45% | -$751K |
|
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.