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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3601
CALL
Imperial Oil
IMO
$60.8B
| $365K | ﹤0.01% |
7,200
-6,000
| -45% | -$299K |
|
|
ONTF
3602
DELISTED
ON24
ONTF
| $365K | ﹤0.01% |
+41,710
| New | +$368K |
|
|
AMAM
3603
PUT
DELISTED
Ambrx Biopharma Inc
AMAM
| $365K | ﹤0.01% |
+41,000
| New | +$206K |
|
|
NEX
3604
CALL
DELISTED
NexTier Oilfield Solutions Inc.
NEX
| $365K | ﹤0.01% |
46,000
-118,700
| -72% | -$1.06M |
|
3605
CALL
Green Brick Partners
GRBK
$3.12B
| $364K | ﹤0.01% |
10,400
+7,400
| +247% | +$229K |
|
3606
PUT
BellRing Brands
BRBR
$1.52B
| $363K | ﹤0.01% |
10,700
+9,700
| +970% | +$286K |
|
3607
PUT
MKS Inc
MKSI
$21.3B
| $363K | ﹤0.01% |
4,100
+2,100
| +105% | +$200K |
|
3608
PUT
Woodside Energy
WDS
$41.4B
| $363K | ﹤0.01% |
16,200
+2,300
| +17% | +$55.3K |
|
|
SJR
3609
DELISTED
Shaw Communications Inc.
SJR
| $363K | ﹤0.01% |
12,154
-9,306
| -43% | -$270K |
|
3610
CALL
Sweetgreen
SG
$733M
| $362K | ﹤0.01% |
46,300
-102,600
| -69% | -$903K |
|
3611
CALL
Talos Energy
TALO
$2.36B
| $362K | ﹤0.01% |
24,400
+22,100
| +961% | +$381K |
|
|
LSXMA
3612
DELISTED
Liberty Media Corporation Series A Liberty SiriusXM Common Stock
LSXMA
| $362K | ﹤0.01% |
17,543
+16,205
| +1,211% | +$406K |
|
|
NATI
3613
DELISTED
National Instruments Corp
NATI
| $362K | ﹤0.01% |
+6,920
| New | +$347K |
|
3614
PUT
Caleres
CAL
$420M
| $361K | ﹤0.01% |
16,700
+8,700
| +109% | +$209K |
|
3615
CALL
Neogen
NEOG
$2.03B
| $361K | ﹤0.01% |
19,500
+5,000
| +34% | +$94K |
|
|
RAPT
3616
CALL
DELISTED
RAPT Therapeutics
RAPT
| $361K | ﹤0.01% |
2,463
+2,038
| +480% | +$412K |
|
3617
Algonquin Power & Utilities
AQN
$4.63B
| $360K | ﹤0.01% |
42,937
-2,042
| -5% | -$15.4K |
|
3618
IonQ
IONQ
$13.4B
| $360K | ﹤0.01% |
58,654
+4,469
| +8% | +$20.9K |
|
|
LEV
3619
CALL
DELISTED
The Lion Electric Company
LEV
| $360K | ﹤0.01% |
193,700
-88,000
| -31% | -$199K |
|
|
UNVR
3620
PUT
DELISTED
Univar Solutions Inc.
UNVR
| $360K | ﹤0.01% |
10,300
-149,900
| -94% | -$5.08M |
|
|
HOLX
3621
DELISTED
Hologic
HOLX
| $359K | ﹤0.01% |
4,453
-15,723
| -78% | -$1.27M |
|
3622
PUT
Oxford Industries
OXM
$602M
| $359K | ﹤0.01% |
3,400
+1,300
| +62% | +$145K |
|
3623
CALL
TaskUs
TASK
$531M
| $359K | ﹤0.01% |
24,900
+16,800
| +207% | +$293K |
|
3624
CALL
Marqeta
MQ
$1.85B
| $357K | ﹤0.01% |
19,550
-39,300
| -67% | -$877K |
|
3625
PUT
USA Compression Partners
USAC
$3.72B
| $357K | ﹤0.01% |
16,900
-15,900
| -48% | -$327K |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.