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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 | |
|---|---|---|---|---|---|---|---|
1001
CALL
Proshares UltraShort Technology
REW
$4.67M
| $6.57M | ﹤0.01% |
504,500
+86,700
| +21% | +$1.03M |
2019 Q2
29 quarters
|
|
1002
CALL
XPLR Infrastructure LP
XIFR
$694M
| $6.57M | ﹤0.01% |
627,600
-40,000
| -6% | -$467K |
2017 Q2
37 quarters
|
|
1003
PUT
Destiny Tech100
DXYZ
$791M
| $6.57M | ﹤0.01% |
212,900
+164,400
| +339% | +$4.76M |
2026 Q2
1 quarter
|
|
1004
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.7B
| $6.57M | ﹤0.01% |
10,000
+4,700
| +89% | +$3.23M |
2015 Q1
46 quarters
|
|
1005
CALL
West Pharmaceutical
WST
$28.8B
| $6.56M | ﹤0.01% |
17,700
| – | – |
2026 Q1
2 quarters
|
|
1006
CALL
DELISTED
Roku
ROKU
| $6.55M | ﹤0.01% |
43,000
-58,400
| -58% | -$8.79M |
2021 Q1
22 quarters
|
|
1007
CALL
Novartis
NVS
$303B
| $6.54M | ﹤0.01% |
45,900
+8,400
| +22% | +$1.27M |
2014 Q4
47 quarters
|
|
1008
PUT
Canadian Pacific Kansas City
CP
$81.5B
| $6.54M | ﹤0.01% |
76,800
-1,800
| -2% | -$163K |
2026 Q1
2 quarters
|
|
1009
Regeneron Pharmaceuticals
REGN
$99.2B
| $6.53M | ﹤0.01% |
8,616
+5,444
| +172% | +$4.11M |
2026 Q2
1 quarter
|
|
1010
CALL
2x Solana ETF
SOLT
$117M
| $6.53M | ﹤0.01% |
88,700
-20,600
| -19% | -$963K |
2026 Q1
2 quarters
|
|
1011
CALL
Fastenal
FAST
$63.7B
| $6.53M | ﹤0.01% |
131,800
+53,300
| +68% | +$2.61M |
2014 Q4
47 quarters
|
|
1012
CALL
Hilton Worldwide Holdings Inc. Common Stock
HLT
$83.9B
| $6.52M | ﹤0.01% |
20,500
+5,000
| +32% | +$1.6M |
2014 Q4
47 quarters
|
|
1013
CALL
Biogen
BIIB
$37.5B
| $6.51M | ﹤0.01% |
28,800
-41,900
| -59% | -$8.89M |
2021 Q2
21 quarters
|
|
1014
PUT
USA Rare Earth Inc
USAR
$3.1B
| $6.49M | ﹤0.01% |
461,100
-139,700
| -23% | -$2.37M |
2025 Q2
5 quarters
|
|
1015
PUT
Quantum Computing Inc
QUBT
$1.4B
| $6.49M | ﹤0.01% |
768,200
-74,400
| -9% | -$627K |
2024 Q4
7 quarters
|
|
1016
CALL
AbCellera Biologics
ABCL
$3.87B
| $6.49M | ﹤0.01% |
444,900
-111,400
| -20% | -$1.06M |
2021 Q1
22 quarters
|
|
1017
CALL
PNC Financial Services
PNC
$92.2B
| $6.49M | ﹤0.01% |
29,200
-5,500
| -16% | -$1.35M |
2014 Q4
47 quarters
|
|
1018
CALL
EOG Resources
EOG
$79.7B
| $6.49M | ﹤0.01% |
47,100
-24,500
| -34% | -$3.5M |
2014 Q4
47 quarters
|
|
1019
PepsiCo
PEP
$196B
| $6.49M | ﹤0.01% |
51,186
+11,680
| +30% | +$1.61M |
2026 Q1
2 quarters
|
|
1020
CALL
FirstEnergy
FE
$26.9B
| $6.47M | ﹤0.01% |
149,300
-4,400
| -3% | -$207K |
2014 Q4
47 quarters
|
|
1021
CALL
Carlyle Group
CG
$14.6B
| $6.47M | ﹤0.01% |
163,100
+39,500
| +32% | +$1.79M |
2016 Q3
40 quarters
|
|
1022
CALL
Dollar Tree
DLTR
$26.8B
| $6.45M | ﹤0.01% |
56,600
-21,000
| -27% | -$2.61M |
2021 Q1
22 quarters
|
|
1023
PUT
Expand Energy Corp
EXE
$20.5B
| $6.44M | ﹤0.01% |
76,600
+41,200
| +116% | +$3.8M |
2021 Q1
22 quarters
|
|
1024
PUT
Quanta Services
PWR
$91.6B
| $6.43M | ﹤0.01% |
10,000
+3,800
| +61% | +$2.45M |
2021 Q2
21 quarters
|
|
1025
PUT
Alnylam Pharmaceuticals
ALNY
$21.4B
| $6.42M | ﹤0.01% |
26,000
+6,000
| +30% | +$1.53M |
2014 Q4
47 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.