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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5551
CALL
Absci
ABSI
$1.32B
| $84K | ﹤0.01% |
20,000
+7,500
| +60% | +$13.9K |
|
5552
Boston Omaha
BOC
$428M
| $84K | ﹤0.01% |
5,394
+4,679
| +654% | +$71K |
|
5553
Bank of Hawaii
BOH
$3.15B
| $84K | ﹤0.01% |
+1,169
| New | +$67.1K |
|
5554
Forum Energy Technologies
FET
$708M
| $84K | ﹤0.01% |
3,834
-2,757
| -42% | -$61.9K |
|
5555
PUT
Kadant
KAI
$3.63B
| $84K | ﹤0.01% |
+300
| New | +$75.1K |
|
5556
PUT
Pacira BioSciences
PCRX
$1.04B
| $84K | ﹤0.01% |
2,500
+1,800
| +257% | +$52.7K |
|
5557
PRA Group
PRAA
$663M
| $84K | ﹤0.01% |
3,224
+1,872
| +138% | +$35K |
|
5558
CALL
System1
SST
$14.3M
| $84K | ﹤0.01% |
3,790
-400
| -10% | -$5.92K |
|
5559
CALL
Tempest Therapeutics
TPST
$13.7M
| $84K | ﹤0.01% |
+1,477
| New | +$69.9K |
|
|
RCM
5560
CALL
DELISTED
R1 RCM Inc. Common Stock
RCM
| $84K | ﹤0.01% |
8,000
-29,900
| -79% | -$339K |
|
|
SBOW
5561
PUT
DELISTED
SilverBow Resources, Inc.
SBOW
| $84K | ﹤0.01% |
2,900
-30,400
| -91% | -$975K |
|
5562
American Battery Technology Co
ABAT
$285M
| $83K | ﹤0.01% |
+17,785
| New | +$91.8K |
|
5563
CALL
Crescent Capital BDC
CCAP
$403M
| $83K | ﹤0.01% |
4,800
+2,900
| +153% | +$48.2K |
|
5564
PUT
Deluxe
DLX
$1.18B
| $83K | ﹤0.01% |
3,900
+3,000
| +333% | +$55.9K |
|
5565
CALL
Haleon
HLN
$43.5B
| $83K | ﹤0.01% |
10,100
-10,700
| -51% | -$88.2K |
|
5566
CALL
Inspired Entertainment
INSE
$184M
| $83K | ﹤0.01% |
+8,500
| New | +$80.3K |
|
5567
CALL
Loews
L
$23.9B
| $83K | ﹤0.01% |
1,200
-6,500
| -84% | -$432K |
|
|
MZTI
5568
CALL
The Marzetti Company
MZTI
$2.93B
| $83K | ﹤0.01% |
500
+100
| +25% | +$16.8K |
|
5569
PUT
Mitek Systems
MITK
$754M
| $83K | ﹤0.01% |
6,400
+600
| +10% | +$6.69K |
|
5570
Protolabs
PRLB
$1.79B
| $83K | ﹤0.01% |
+2,154
| New | +$69.7K |
|
5571
CALL
QuickLogic
QUIK
$232M
| $83K | ﹤0.01% |
6,000
+5,000
| +500% | +$54K |
|
5572
PUT
Safe Bulkers
SB
$795M
| $83K | ﹤0.01% |
21,300
+100
| +0.5% | +$352 |
|
5573
CALL
TaskUs
TASK
$556M
| $83K | ﹤0.01% |
6,400
+1,000
| +19% | +$11.1K |
|
5574
CALL
ZipRecruiter
ZIP
$321M
| $83K | ﹤0.01% |
6,000
-86,900
| -94% | -$1.07M |
|
5575
Acumen Pharmaceuticals
ABOS
$155M
| $82K | ﹤0.01% |
21,422
+9,974
| +87% | +$29.6K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.