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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 | |
|---|---|---|---|---|---|---|---|
5001
Fresenius Medical Care
FMS
$11.4B
| $145K | ﹤0.01% |
+6,464
| New | +$152K |
2026 Q3
0 quarters
|
|
5002
PUT
Aeluma Inc
ALMU
$127M
| $145K | ﹤0.01% |
11,700
+700
| +6% | +$10.6K |
2025 Q3
4 quarters
|
|
5003
CALL
ICU Medical
ICUI
$4.48B
| $144K | ﹤0.01% |
900
-3,600
| -80% | -$598K |
2026 Q2
1 quarter
|
|
5004
CALL
Rush Street Interactive
RSI
$1.36B
| $144K | ﹤0.01% |
7,100
-58,700
| -89% | -$1.6M |
2020 Q3
24 quarters
|
|
5005
CALL
Axcelis
ACLS
$3.22B
| $144K | ﹤0.01% |
1,100
-900
| -45% | -$115K |
2017 Q2
37 quarters
|
|
5006
CALL
Gladstone Capital
GLAD
$439M
| $144K | ﹤0.01% |
7,500
+1,100
| +17% | +$21.5K |
2019 Q2
29 quarters
|
|
5007
PUT
Trinity Capital Inc
TRIN
$1.75B
| $144K | ﹤0.01% |
8,200
+4,300
| +110% | +$77K |
2021 Q4
19 quarters
|
|
5008
PUT
Progress Software
PRGS
$1.79B
| $144K | ﹤0.01% |
3,600
+3,100
| +620% | +$128K |
2025 Q1
6 quarters
|
|
5009
CALL
Stitch Fix
SFIX
$379M
| $144K | ﹤0.01% |
56,200
+11,800
| +27% | +$40.2K |
2021 Q1
22 quarters
|
|
5010
Prospect Capital
PSEC
$813M
| $144K | ﹤0.01% |
69,081
-18,531
| -21% | -$41.2K |
2026 Q2
1 quarter
|
|
5011
CALL
BRC Group Holdings
RILY
$138M
| $144K | ﹤0.01% |
29,400
-9,700
| -25% | -$66.6K |
2020 Q1
26 quarters
|
|
5012
CALL
Virtu Financial
VIRT
$5.26B
| $143K | ﹤0.01% |
2,600
-14,500
| -85% | -$869K |
2016 Q4
39 quarters
|
|
5013
CALL
Park Hotels & Resorts
PK
$3.27B
| $143K | ﹤0.01% |
9,300
+7,700
| +481% | +$116K |
2019 Q3
28 quarters
|
|
5014
PUT
Invesco Mortgage Capital
IVR
$550M
| $143K | ﹤0.01% |
23,600
+19,500
| +476% | +$143K |
2026 Q1
2 quarters
|
|
5015
CALL
CrossAmerica Partners
CAPL
$759M
| $143K | ﹤0.01% |
6,700
+200
| +3% | +$4.5K |
2019 Q4
27 quarters
|
|
5016
PUT
Sionna Therapeutics
SION
$151M
| $143K | ﹤0.01% |
+27,200
| New | +$625K |
2026 Q3
0 quarters
|
|
5017
Erie Indemnity
ERIE
$14.4B
| $143K | ﹤0.01% |
+652
| New | +$159K |
2026 Q3
0 quarters
|
|
5018
Kodak
KODK
$798M
| $143K | ﹤0.01% |
+14,926
| New | +$135K |
2026 Q3
0 quarters
|
|
5019
Loews
L
$22.6B
| $143K | ﹤0.01% |
+1,366
| New | +$153K |
2026 Q3
0 quarters
|
|
5020
Grand Canyon Education
LOPE
$3.08B
| $143K | ﹤0.01% |
941
-446
| -32% | -$66.2K |
2026 Q1
2 quarters
|
|
5021
CALL
Enovis
ENOV
$1.6B
| $143K | ﹤0.01% |
7,800
+7,700
| +7,700% | +$183K |
2023 Q2
13 quarters
|
|
5022
Olin
OLN
$1.99B
| $142K | ﹤0.01% |
+9,192
| New | +$174K |
2026 Q3
0 quarters
|
|
5023
Fluence Energy
FLNC
$670M
| $142K | ﹤0.01% |
18,548
-90,157
| -83% | -$1.09M |
2025 Q4
3 quarters
|
|
5024
CALL
Veru
VERU
$35.6M
| $142K | ﹤0.01% |
53,500
-23,000
| -30% | -$58.3K |
2019 Q2
29 quarters
|
|
5025
PUT
Universal Technical Institute
UTI
$1.21B
| $142K | ﹤0.01% |
7,600
-36,400
| -83% | -$1.1M |
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.