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 | |
|---|---|---|---|---|---|---|
1
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $12.2B | 10.72% |
29,795,500
+7,150,400
| +32% | +$2.85B |
|
|
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$787B
| $7.77B | 6.83% |
18,988,200
+2,542,100
| +15% | +$1.01B |
|
|
3
PUT
Invesco QQQ Trust
QQQ
$471B
| $5.83B | 5.13% |
18,178,700
+8,230,200
| +83% | +$2.43B |
|
4
PUT
iShares S&P 100 ETF
OEF
$20.2B
| $3.99B | 3.51% |
30,801,900
+3,270,800
| +12% | +$587M |
|
|
5
CALL
Invesco QQQ Trust
QQQ
$471B
| $3.28B | 2.88% |
10,214,400
+1,710,700
| +20% | +$505M |
|
|
6
CALL
Tesla
TSLA
$1.42T
| $2.62B | 2.3% |
12,627,200
-411,400
| -3% | -$71.8M |
|
|
7
CALL
iShares S&P 100 ETF
OEF
$20.2B
| $2.26B | 1.98% |
18,926,800
+986,100
| +5% | +$177M |
|
|
8
PUT
Tesla
TSLA
$1.42T
| $2.25B | 1.98% |
10,844,900
-1,867,600
| -15% | -$326M |
|
|
9
CALL
Amazon
AMZN
$2.66T
| $1.5B | 1.32% |
14,540,000
-4,391,500
| -23% | -$424M |
|
|
10
CALL
Apple
AAPL
$4.81T
| $1.5B | 1.32% |
9,106,000
-4,492,100
| -33% | -$663M |
|
|
11
PUT
Apple
AAPL
$4.81T
| $1.47B | 1.29% |
8,919,000
+85,500
| +1% | +$12.6M |
|
|
12
CALL
Meta Platforms (Facebook)
META
$1.63T
| $1.46B | 1.28% |
6,896,900
-238,800
| -3% | -$40.7M |
|
13
CALL
Alphabet (Google) Class A
GOOGL
$4.24T
| $1.37B | 1.2% |
13,178,600
+3,674,500
| +39% | +$353M |
|
14
CALL
Microsoft
MSFT
$2.95T
| $1.35B | 1.19% |
4,696,400
+1,023,000
| +28% | +$261M |
|
15
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $1.34B | 1.18% |
39,742,600
-3,494,800
| -8% | -$141M |
|
|
16
PUT
NVIDIA
NVDA
$5.02T
| $1.33B | 1.17% |
47,949,000
+3,970,000
| +9% | +$85.9M |
|
|
17
CALL
NVIDIA
NVDA
$5.02T
| $1.19B | 1.05% |
42,942,000
+6,890,000
| +19% | +$149M |
|
18
CALL
SPDR Gold Trust
GLD
$132B
| $1.09B | 0.96% |
5,955,000
+1,646,600
| +38% | +$290M |
|
|
19
PUT
Microsoft
MSFT
$2.95T
| $923M | 0.81% |
3,202,300
+381,700
| +14% | +$97.4M |
|
|
20
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $882M | 0.78% |
27,539,000
+5,346,200
| +24% | +$216M |
|
|
21
PUT
Meta Platforms (Facebook)
META
$1.63T
| $864M | 0.76% |
4,077,700
+769,200
| +23% | +$131M |
|
|
22
PUT
Alphabet (Google) Class A
GOOGL
$4.24T
| $796M | 0.7% |
7,669,500
+1,432,900
| +23% | +$137M |
|
|
23
PUT
SPDR Gold Trust
GLD
$132B
| $763M | 0.67% |
4,163,100
+2,010,700
| +93% | +$354M |
|
24
PUT
Netflix
NFLX
$286B
| $725M | 0.64% |
20,988,000
-4,099,000
| -16% | -$136M |
|
25
CALL
Alibaba
BABA
$283B
| $629M | 0.55% |
6,156,600
+1,621,700
| +36% | +$162M |
|
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.