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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 | |
|---|---|---|---|---|---|---|---|
76
CALL
Robinhood
HOOD
$75B
| $217M | 0.12% |
1,932,600
-201,600
| -9% | -$21.4M |
2021 Q4
19 quarters
|
|
77
CALL
Strategy Inc
MSTR
$53.2B
| $216M | 0.12% |
1,431,700
+41,100
| +3% | +$4.75M |
2020 Q4
23 quarters
|
|
78
CALL
Palo Alto Networks
PANW
$271B
| $214M | 0.12% |
538,000
+104,600
| +24% | +$37.2M |
2014 Q4
47 quarters
|
|
79
CALL
State Street SPDR NYSE Technology ETF
XNTK
$1.74B
| $199M | 0.11% |
1,597,200
-192,300
| -11% | -$69M |
2014 Q4
47 quarters
|
|
80
CALL
Bloom Energy
BE
$57.3B
| $196M | 0.11% |
708,500
+272,400
| +62% | +$64.3M |
2018 Q3
32 quarters
|
|
81
PUT
Moderna
MRNA
$109B
| $193M | 0.1% |
1,000,400
+282,600
| +39% | +$30.5M |
2020 Q4
23 quarters
|
|
82
CALL
Arm
ARM
$199B
| $191M | 0.1% |
658,000
+158,200
| +32% | +$43.1M |
2023 Q3
12 quarters
|
|
83
PUT
ASML
ASML
$583B
| $191M | 0.1% |
105,200
-700
| -0.7% | -$1.21M |
2014 Q4
47 quarters
|
|
84
PUT
iShares Silver Trust
SLV
$25.9B
| $181M | 0.1% |
3,326,100
-2,461,500
| -43% | -$139M |
2021 Q2
21 quarters
|
|
85
PUT
Coinbase
COIN
$36B
| $181M | 0.1% |
971,300
-199,600
| -17% | -$33.9M |
2021 Q2
21 quarters
|
|
86
CALL
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $178M | 0.1% |
2,980,700
+1,263,200
| +74% | +$75.6M |
2024 Q2
9 quarters
|
|
|
87
PUT
Robinhood
HOOD
$75B
| $178M | 0.1% |
1,581,100
+1,400
| +0.1% | +$149K |
2021 Q4
19 quarters
|
|
88
PUT
CrowdStrike
CRWD
$234B
| $177M | 0.1% |
668,100
-41,500
| -6% | -$8.81M |
2019 Q2
29 quarters
|
|
89
PUT
Seagate
STX
$116B
| $177M | 0.1% |
191,500
+4,000
| +2% | +$3.42M |
2026 Q1
2 quarters
|
|
90
PUT
SK Hynix Inc
SKHY
$948B
| $175M | 0.1% |
+952,000
| New | +$157M |
2026 Q3
0 quarters
|
|
91
CALL
JPMorgan Chase
JPM
$908B
| $175M | 0.1% |
529,200
+53,900
| +11% | +$18.9M |
2014 Q4
47 quarters
|
|
92
CALL
CoreWeave
CRWV
$27B
| $170M | 0.09% |
1,948,400
+933,700
| +92% | +$79.7M |
2025 Q2
5 quarters
|
|
|
93
PUT
CoreWeave
CRWV
$27B
| $169M | 0.09% |
1,937,300
+752,400
| +63% | +$64.3M |
2025 Q2
5 quarters
|
|
94
PUT
ARK Space & Defense Innovation ETF
ARKX
$673M
| $167M | 0.09% |
2,066,900
+966,800
| +88% | +$31.3M |
2021 Q2
21 quarters
|
|
95
PUT
Applied Materials
AMAT
$294B
| $166M | 0.09% |
324,000
+10,800
| +3% | +$5.48M |
2021 Q1
22 quarters
|
|
96
CALL
Nebius Group N.V.
NBIS
$38.5B
| $166M | 0.09% |
702,000
+168,500
| +32% | +$36.2M |
2024 Q4
7 quarters
|
|
97
PUT
Citigroup
C
$202B
| $165M | 0.09% |
1,277,000
-20,900
| -2% | -$2.81M |
2014 Q4
47 quarters
|
|
98
CALL
Dell
DELL
$220B
| $163M | 0.09% |
302,700
-8,500
| -3% | -$3.99M |
2016 Q3
40 quarters
|
|
|
99
CALL
SK Hynix Inc
SKHY
$948B
| $162M | 0.09% |
+879,700
| New | +$145M |
2026 Q3
0 quarters
|
|
|
100
PUT
Arm
ARM
$199B
| $159M | 0.09% |
548,600
-274,000
| -33% | -$74.6M |
2023 Q3
12 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.