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 | |
|---|---|---|---|---|---|---|
5501
PUT
Genmab
GMAB
$17.7B
| $89K | ﹤0.01% |
2,800
+2,400
| +600% | +$75.4K |
|
|
XRN
5502
PUT
Chiron Real Estate Inc
XRN
$514M
| $89K | ﹤0.01% |
1,620
-780
| -33% | -$37.8K |
|
5503
PUT
Prudential
PUK
$37.6B
| $89K | ﹤0.01% |
+4,000
| New | +$87.7K |
|
5504
PUT
Sonoco
SON
$5.57B
| $89K | ﹤0.01% |
1,600
+600
| +60% | +$32.5K |
|
|
ZUO
5505
CALL
DELISTED
Zuora, Inc.
ZUO
| $89K | ﹤0.01% |
9,500
-11,800
| -55% | -$97.4K |
|
5506
CALL
Aaon
AAON
$7.3B
| $88K | ﹤0.01% |
1,200
+500
| +71% | +$30.8K |
|
5507
PUT
Aurora
AUR
$12.6B
| $88K | ﹤0.01% |
20,300
+17,100
| +534% | +$42.5K |
|
5508
CALL
Aura Biosciences
AURA
$725M
| $88K | ﹤0.01% |
+10,000
| New | +$84.7K |
|
|
AUTL
5509
Autolus Therapeutics
AUTL
$407M
| $88K | ﹤0.01% |
13,691
-4,336
| -24% | -$16.5K |
|
5510
PUT
Vanguard Total International Bond ETF
BNDX
$81.9B
| $88K | ﹤0.01% |
1,800
+1,000
| +125% | +$48.7K |
|
5511
PUT
Bentley Systems
BSY
$10.8B
| $88K | ﹤0.01% |
1,700
-800
| -32% | -$41.1K |
|
5512
Grab
GRAB
$14.3B
| $88K | ﹤0.01% |
26,346
-115,274
| -81% | -$373K |
|
|
NREF
5513
PUT
NexPoint Real Estate Finance
NREF
$320M
| $88K | ﹤0.01% |
+5,600
| New | +$86.8K |
|
5514
PUT
Odyssey Marine Exploration
OMEX
$34.9M
| $88K | ﹤0.01% |
19,100
+2,300
| +14% | +$8.38K |
|
5515
CALL
Prosperity Bancshares
PB
$8.97B
| $88K | ﹤0.01% |
1,300
-800
| -38% | -$46.8K |
|
|
PLYA
5516
DELISTED
Playa Hotels & Resorts
PLYA
| $88K | ﹤0.01% |
10,287
+3,831
| +59% | +$28.8K |
|
5517
CALL
ThredUp
TDUP
$746M
| $88K | ﹤0.01% |
39,500
-3,400
| -8% | -$8.84K |
|
5518
PUT
Timken Company
TKR
$9.56B
| $88K | ﹤0.01% |
1,100
| – | – |
|
5519
iShares 10-20 Year Treasury Bond ETF
TLH
$10.9B
| $88K | ﹤0.01% |
819
+818
| +81,800% | +$81.9K |
|
|
TSE
5520
CALL
DELISTED
Trinseo
TSE
| $88K | ﹤0.01% |
10,600
+9,700
| +1,078% | +$64.9K |
|
5521
PUT
Adient
ADNT
$1.65B
| $87K | ﹤0.01% |
2,400
+300
| +14% | +$10.3K |
|
|
BRAG
5522
PUT
Bragg Gaming Group
BRAG
$50.6M
| $87K | ﹤0.01% |
17,300
+16,900
| +4,225% | +$81.8K |
|
5523
CALL
CMS Energy
CMS
$22.6B
| $87K | ﹤0.01% |
1,500
+1,000
| +200% | +$55.8K |
|
5524
Corvus Pharmaceuticals
CRVS
$1.12B
| $87K | ﹤0.01% |
49,631
+10,138
| +26% | +$14.8K |
|
5525
CALL
Community Health Systems
CYH
$393M
| $87K | ﹤0.01% |
27,800
-253,500
| -90% | -$683K |
|
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.