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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 | |
|---|---|---|---|---|---|---|---|
1801
CALL
Crescent Energy
CRGY
$4.9B
| $2.4M | ﹤0.01% |
186,300
+55,000
| +42% | +$674K |
2022 Q3
16 quarters
|
|
1802
CALL
Service Corp International
SCI
$10.2B
| $2.4M | ﹤0.01% |
31,500
+23,700
| +304% | +$1.92M |
2021 Q2
21 quarters
|
|
1803
Icahn Enterprises
IEP
$3.78B
| $2.4M | ﹤0.01% |
355,215
+102,706
| +41% | +$741K |
2025 Q2
5 quarters
|
|
1804
CALL
Markel Group
MKL
$24.1B
| $2.4M | ﹤0.01% |
1,400
| – | – |
2026 Q2
1 quarter
|
|
1805
PUT
XP
XP
$7.8B
| $2.39M | ﹤0.01% |
113,900
+104,200
| +1,074% | +$1.85M |
2021 Q1
22 quarters
|
|
1806
PUT
Liberty Energy
LBRT
$2.11B
| $2.38M | ﹤0.01% |
130,900
+73,900
| +130% | +$1.53M |
2020 Q2
25 quarters
|
|
1807
CALL
Illumina
ILMN
$32.2B
| $2.38M | ﹤0.01% |
8,700
-5,800
| -40% | -$1.22M |
2014 Q4
47 quarters
|
|
1808
PUT
Carlyle Group
CG
$14.6B
| $2.38M | ﹤0.01% |
60,000
-7,500
| -11% | -$340K |
2015 Q1
46 quarters
|
|
1809
CALL
Mobileye
MBLY
$4.91B
| $2.38M | ﹤0.01% |
321,500
-183,100
| -36% | -$1.57M |
2022 Q4
15 quarters
|
|
1810
PUT
Ascendis Pharma A/S
ASND
$17.1B
| $2.37M | ﹤0.01% |
10,400
+1,200
| +13% | +$304K |
2022 Q4
15 quarters
|
|
1811
Grab
GRAB
$13.4B
| $2.36M | ﹤0.01% |
759,656
+350,341
| +86% | +$1.21M |
2025 Q1
6 quarters
|
|
1812
PUT
KE Holdings
BEKE
$19.7B
| $2.36M | ﹤0.01% |
140,200
-24,800
| -15% | -$416K |
2020 Q3
24 quarters
|
|
1813
PUT
Shake Shack
SHAK
$3.03B
| $2.36M | ﹤0.01% |
40,200
-57,200
| -59% | -$3.64M |
2021 Q1
22 quarters
|
|
1814
CALL
Ball Corp
BALL
$17.1B
| $2.36M | ﹤0.01% |
42,100
+18,500
| +78% | +$1.15M |
2015 Q1
46 quarters
|
|
1815
PUT
Equinox Gold
EQX
$12.6B
| $2.36M | ﹤0.01% |
212,100
+101,500
| +92% | +$1.13M |
2020 Q2
25 quarters
|
|
1816
PUT
Ryman Hospitality Properties
RHP
$9.6B
| $2.35M | ﹤0.01% |
19,700
+16,700
| +557% | +$2.1M |
2025 Q4
3 quarters
|
|
1817
VanEck Gold Miners ETF
GDX
$26.3B
| $2.35M | ﹤0.01% |
26,784
-106,699
| -80% | -$9.32M |
2025 Q4
3 quarters
|
|
1818
CALL
Serve Robotics
SERV
$278M
| $2.35M | ﹤0.01% |
505,400
+121,700
| +32% | +$610K |
2024 Q3
8 quarters
|
|
1819
CALL
YieldMax BABA Option Income Strategy ETF
BABO
$12M
| $2.35M | ﹤0.01% |
76,600
+51,000
| +199% | +$406K |
2024 Q3
8 quarters
|
|
1820
PUT
Waste Management
WM
$95.5B
| $2.35M | ﹤0.01% |
11,500
-6,000
| -34% | -$1.34M |
2015 Q2
45 quarters
|
|
1821
QuantumScape Corp
QS
$2.61B
| $2.34M | ﹤0.01% |
504,362
+243,457
| +93% | +$1.38M |
2026 Q1
2 quarters
|
|
1822
CALL
Entergy
ETR
$53.5B
| $2.34M | ﹤0.01% |
23,600
+22,200
| +1,586% | +$2.4M |
2016 Q1
42 quarters
|
|
1823
CALL
Obsidian Energy
OBE
$624M
| $2.34M | ﹤0.01% |
227,300
+70,400
| +45% | +$747K |
2022 Q2
17 quarters
|
|
1824
CALL
Trip.com Group
TCOM
$27.5B
| $2.34M | ﹤0.01% |
59,800
-9,800
| -14% | -$422K |
2014 Q4
47 quarters
|
|
1825
PUT
Honeywell
HON
$72.1B
| $2.33M | ﹤0.01% |
47,600
-24,000
| -34% | -$5.36M |
2021 Q2
21 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.