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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 | |
|---|---|---|---|---|---|---|---|
3801
CALL
Lithia Motors
LAD
$6.43B
| $409K | ﹤0.01% |
1,400
-200
| -13% | -$69.7K |
2019 Q3
28 quarters
|
|
3802
CALL
CVR Partners
UAN
$1.18B
| $408K | ﹤0.01% |
3,300
+1,600
| +94% | +$199K |
2020 Q4
23 quarters
|
|
3803
PUT
Ocular Therapeutix
OCUL
$1.33B
| $408K | ﹤0.01% |
53,200
-10,600
| -17% | -$104K |
2021 Q2
21 quarters
|
|
3804
DELISTED
Kenvue
KVUE
| $408K | ﹤0.01% |
+23,086
| New | +$435K |
2026 Q3
0 quarters
|
|
3805
CALL
Backblaze
BLZE
$514M
| $407K | ﹤0.01% |
29,100
-27,500
| -49% | -$413K |
2021 Q4
19 quarters
|
|
3806
PUT
Eton Pharmaceutcials
ETON
$1.81B
| $407K | ﹤0.01% |
7,900
-10,900
| -58% | -$553K |
2025 Q3
4 quarters
|
|
3807
PUT
Himax Technologies
HIMX
$1.51B
| $407K | ﹤0.01% |
28,900
-1,100
| -4% | -$15.2K |
2021 Q2
21 quarters
|
|
3808
Rayonier Advanced Materials
RYAM
$369M
| $406K | ﹤0.01% |
51,003
+44,500
| +684% | +$372K |
2026 Q2
1 quarter
|
|
3809
PUT
Genesco
GCO
$388M
| $406K | ﹤0.01% |
11,900
-43,400
| -78% | -$1.53M |
2025 Q1
6 quarters
|
|
3810
CALL
Ardagh Metal Packaging
AMBP
$2.74B
| $406K | ﹤0.01% |
93,600
-150,000
| -62% | -$727K |
2021 Q4
19 quarters
|
|
3811
PUT
Collegium Pharmaceutical
COLL
$772M
| $406K | ﹤0.01% |
18,600
+1,000
| +6% | +$29.2K |
2026 Q2
1 quarter
|
|
3812
PUT
Dominion Energy
D
$59.3B
| $405K | ﹤0.01% |
6,700
-2,000
| -23% | -$134K |
2014 Q4
47 quarters
|
|
3813
CALL
Airship AI Holdings
AISP
$55.1M
| $405K | ﹤0.01% |
218,000
-60,700
| -22% | -$123K |
2024 Q2
9 quarters
|
|
3814
State Street SPDR S&P Aerospace & Defense ETF
XAR
$5.13B
| $405K | ﹤0.01% |
1,752
+423
| +32% | +$112K |
2026 Q1
2 quarters
|
|
3815
CALL
VanEck Energy Income ETF
EINC
$83M
| $405K | ﹤0.01% |
5,500
-95,200
| -95% | -$11.4M |
2026 Q1
2 quarters
|
|
3816
CALL
T-REX 2X Long GME Daily Target ETF
GMEU
$30.3M
| $404K | ﹤0.01% |
+35,400
| New | +$247K |
2026 Q3
0 quarters
|
|
3817
Agree Realty
ADC
$9B
| $404K | ﹤0.01% |
+6,048
| New | +$451K |
2026 Q3
0 quarters
|
|
3818
Cenovus Energy
CVE
$52.1B
| $404K | ﹤0.01% |
12,997
-5,780
| -31% | -$174K |
2025 Q4
3 quarters
|
|
3819
Peloton Interactive
PTON
$2.56B
| $404K | ﹤0.01% |
80,909
-120,673
| -60% | -$675K |
2024 Q1
10 quarters
|
|
3820
CALL
Global X MSCI Norway ETF
NORW
$91.5M
| $403K | ﹤0.01% |
11,600
+11,000
| +1,833% | +$392K |
2017 Q1
38 quarters
|
|
3821
CALL
Prospect Capital
PSEC
$774M
| $403K | ﹤0.01% |
193,800
+10,300
| +6% | +$22.9K |
2021 Q2
21 quarters
|
|
3822
PUT
GSI Technology
GSIT
$114M
| $403K | ﹤0.01% |
74,000
+65,500
| +771% | +$388K |
2023 Q2
13 quarters
|
|
3823
Mid-America Apartment Communities
MAA
$13.6B
| $402K | ﹤0.01% |
3,418
-1,316
| -28% | -$171K |
2026 Q1
2 quarters
|
|
3824
PUT
Opera Ltd
OPRA
$1.38B
| $402K | ﹤0.01% |
22,800
+3,200
| +16% | +$60.8K |
2023 Q2
13 quarters
|
|
3825
PUT
TE Connectivity
TEL
$61.1B
| $401K | ﹤0.01% |
1,900
-3,000
| -61% | -$620K |
2017 Q2
37 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.