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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
2601
uniQure
QURE
$1.72B
| $1.13M | ﹤0.01% |
46,650
-63,569
| -58% | -$2.76M |
2024 Q3
8 quarters
|
|
2602
PUT
Rollins
ROL
$18.4B
| $1.13M | ﹤0.01% |
37,400
+33,200
| +790% | +$1.25M |
2026 Q2
1 quarter
|
|
2603
PUT
Leverage Shares 2X Long ONDS Daily ETF
ONDG
$10.8M
| $1.12M | ﹤0.01% |
152,600
+98,400
| +182% | +$265K |
2026 Q1
2 quarters
|
|
2604
PUT
Kodiak Gas Services
KGS
$4.45B
| $1.12M | ﹤0.01% |
21,200
+14,000
| +194% | +$855K |
2025 Q2
5 quarters
|
|
2605
CALL
NovoCure
NVCR
$1.4B
| $1.12M | ﹤0.01% |
70,300
+6,400
| +10% | +$107K |
2015 Q4
43 quarters
|
|
2606
PUT
Tenable Holdings
TENB
$4.49B
| $1.12M | ﹤0.01% |
30,800
+14,500
| +89% | +$521K |
2018 Q3
32 quarters
|
|
2607
CALL
Pool Corp
POOL
$7.71B
| $1.12M | ﹤0.01% |
6,900
+4,700
| +214% | +$889K |
2019 Q4
27 quarters
|
|
2608
CALL
Corbus Pharmaceuticals
CRBP
$82.4M
| $1.12M | ﹤0.01% |
163,700
+55,500
| +51% | +$512K |
2026 Q1
2 quarters
|
|
2609
CALL
BBVA Argentina
BBAR
$2.18B
| $1.12M | ﹤0.01% |
86,800
+9,200
| +12% | +$153K |
2018 Q2
33 quarters
|
|
2610
CALL
Northern Oil and Gas
NOG
$2.58B
| $1.11M | ﹤0.01% |
48,700
+9,500
| +24% | +$219K |
2021 Q2
21 quarters
|
|
2611
PUT
F5
FFIV
$18.2B
| $1.11M | ﹤0.01% |
2,500
-6,700
| -73% | -$2.76M |
2014 Q4
47 quarters
|
|
2612
Red Violet
RDVT
$1.21B
| $1.11M | ﹤0.01% |
14,083
+5,505
| +64% | +$389K |
2025 Q2
5 quarters
|
|
2613
PUT
Dynex Capital
DX
$2.71B
| $1.11M | ﹤0.01% |
99,600
+92,100
| +1,228% | +$1.17M |
2020 Q2
25 quarters
|
|
2614
PUT
Clear Secure
YOU
$5.52B
| $1.11M | ﹤0.01% |
26,400
+13,900
| +111% | +$667K |
2021 Q4
19 quarters
|
|
2615
Direxion Daily AAPL Bull 2X ETF
AAPU
$133M
| $1.11M | ﹤0.01% |
24,992
+7,798
| +45% | +$328K |
2025 Q2
5 quarters
|
|
2616
Suncor Energy
SU
$79.4B
| $1.11M | ﹤0.01% |
+16,285
| New | +$1.06M |
2026 Q3
0 quarters
|
|
2617
PUT
Booz Allen Hamilton
BAH
$10.3B
| $1.1M | ﹤0.01% |
15,900
+10,000
| +169% | +$720K |
2026 Q1
2 quarters
|
|
2618
CALL
UL Solutions
ULS
$16.5B
| $1.1M | ﹤0.01% |
16,800
+8,900
| +113% | +$697K |
2025 Q1
6 quarters
|
|
|
2619
PUT
Corbus Pharmaceuticals
CRBP
$82.4M
| $1.1M | ﹤0.01% |
161,600
+150,300
| +1,330% | +$1.39M |
2026 Q1
2 quarters
|
|
2620
CALL
Industrial Logistics Properties Trust
ILPT
$421M
| $1.1M | ﹤0.01% |
155,200
+148,200
| +2,117% | +$1.25M |
2026 Q1
2 quarters
|
|
2621
CALL
Twist Bioscience
TWST
$8.13B
| $1.1M | ﹤0.01% |
5,700
+1,600
| +39% | +$198K |
2020 Q3
24 quarters
|
|
2622
Parker-Hannifin
PH
$123B
| $1.1M | ﹤0.01% |
+1,152
| New | +$1.13M |
2026 Q3
0 quarters
|
|
2623
CALL
Sutro Biopharma
STRO
$170M
| $1.1M | ﹤0.01% |
68,300
+68,200
| +68,200% | +$1.51M |
2026 Q2
1 quarter
|
|
2624
CALL
Jumia Technologies
JMIA
$764M
| $1.1M | ﹤0.01% |
165,400
-85,000
| -34% | -$565K |
2019 Q2
29 quarters
|
|
2625
CALL
American Superconductor
AMSC
$1.25B
| $1.1M | ﹤0.01% |
37,700
-2,500
| -6% | -$78.4K |
2026 Q1
2 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.