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 | |
|---|---|---|---|---|---|---|
4576
CALL
Griffon
GFF
$4.02B
| $256K | ﹤0.01% |
3,500
+1,700
| +94% | +$111K |
|
4577
CALL
Janux Therapeutics
JANX
$912M
| $256K | ﹤0.01% |
+6,800
| New | +$148K |
|
|
LTC
4578
CALL
LTC Properties
LTC
$2.13B
| $256K | ﹤0.01% |
7,900
+1,900
| +32% | +$60.5K |
|
|
NOAH
4579
Noah Holdings
NOAH
$590M
| $256K | ﹤0.01% |
22,454
+16,487
| +276% | +$191K |
|
4580
PUT
Vishay Intertechnology
VSH
$4.6B
| $256K | ﹤0.01% |
11,300
+4,200
| +59% | +$93.5K |
|
4581
Arcutis Biotherapeutics
ARQT
$3.48B
| $255K | ﹤0.01% |
25,795
-30,023
| -54% | -$224K |
|
4582
CALL
DocGo
DCGO
$64.2M
| $255K | ﹤0.01% |
63,300
-7,700
| -11% | -$29K |
|
4583
Immersion
IMMR
$243M
| $255K | ﹤0.01% |
+34,213
| New | +$243K |
|
|
PDS
4584
CALL
Precision Drilling
PDS
$940M
| $255K | ﹤0.01% |
3,800
+3,100
| +443% | +$187K |
|
4585
Silicon Motion
SIMO
$7.11B
| $255K | ﹤0.01% |
+3,320
| New | +$227K |
|
4586
PUT
Teradata
TDC
$2.88B
| $255K | ﹤0.01% |
6,600
-7,700
| -54% | -$325K |
|
4587
CALL
ADT
ADT
$5.43B
| $254K | ﹤0.01% |
37,900
+11,300
| +42% | +$75K |
|
|
AKRO
4588
DELISTED
Akero Therapeutics
AKRO
| $254K | ﹤0.01% |
+10,088
| New | +$242K |
|
4589
PUT
Amkor Technology
AMKR
$10.6B
| $254K | ﹤0.01% |
7,900
+5,100
| +182% | +$162K |
|
|
DENN
4590
CALL
DELISTED
Denny's
DENN
| $254K | ﹤0.01% |
28,400
-1,800
| -6% | -$17.7K |
|
4591
PUT
Fortuna Silver Mines
FSM
$2.54B
| $254K | ﹤0.01% |
68,100
-29,500
| -30% | -$94.4K |
|
4592
HEICO Corp
HEI
$49.6B
| $254K | ﹤0.01% |
+1,331
| New | +$247K |
|
4593
CALL
John B. Sanfilippo & Son
JBSS
$986M
| $254K | ﹤0.01% |
2,400
+300
| +14% | +$30.9K |
|
|
OKLO
4594
Oklo
OKLO
$6.41B
| $254K | ﹤0.01% |
+22,297
| New | +$240K |
|
|
TPC
4595
CALL
Tutor Perini Cor
TPC
$4.03B
| $254K | ﹤0.01% |
17,600
+9,200
| +110% | +$94K |
|
4596
PUT
Phreesia
PHR
$689M
| $253K | ﹤0.01% |
10,600
-42,300
| -80% | -$1.05M |
|
4597
Webster Financial
WBS
$12.3B
| $253K | ﹤0.01% |
4,988
-20,690
| -81% | -$1.01M |
|
4598
CALL
Kamada
KMDA
$404M
| $252K | ﹤0.01% |
+45,000
| New | +$266K |
|
|
REFI
4599
CALL
Chicago Atlantic Real Estate Finance
REFI
$251M
| $252K | ﹤0.01% |
16,000
+7,500
| +88% | +$120K |
|
4600
Teucrium Wheat Fund
WEAT
$293M
| $252K | ﹤0.01% |
9,327
-30,434
| -77% | -$835K |
|
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.