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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 | |
|---|---|---|---|---|---|---|---|
4926
CALL
Aris Mining
ARIS
$3.06B
| $155K | ﹤0.01% |
8,900
| – | – |
2025 Q2
5 quarters
|
|
4927
PUT
Tenaris
TS
$30.8B
| $155K | ﹤0.01% |
2,800
-24,100
| -90% | -$1.34M |
2022 Q1
18 quarters
|
|
4928
PUT
Surrozen
SRZN
$554M
| $154K | ﹤0.01% |
+4,800
| New | +$108K |
2026 Q3
0 quarters
|
|
4929
Fulcrum Therapeutics
FULC
$281M
| $154K | ﹤0.01% |
+41,650
| New | +$156K |
2026 Q3
0 quarters
|
|
4930
PUT
Philips
PHG
$29.4B
| $154K | ﹤0.01% |
6,300
-300
| -5% | -$7.89K |
2017 Q4
35 quarters
|
|
4931
US Treasury 30 Year Bond ETF
UTHY
$214M
| $154K | ﹤0.01% |
4,202
+4,200
| +210,000% | +$164K |
2026 Q2
1 quarter
|
|
4932
CALL
Highwoods Properties
HIW
$3.41B
| $154K | ﹤0.01% |
5,300
-3,700
| -41% | -$117K |
2021 Q2
21 quarters
|
|
4933
CALL
SandRidge Energy
SD
$488M
| $154K | ﹤0.01% |
11,400
+1,400
| +14% | +$19.5K |
2020 Q2
25 quarters
|
|
4934
PUT
Matsons
MATX
$6.3B
| $154K | ﹤0.01% |
700
| – | – |
2025 Q1
6 quarters
|
|
4935
CALL
National Healthcare
NHC
$3.3B
| $154K | ﹤0.01% |
+700
| New | +$156K |
2026 Q3
0 quarters
|
|
|
IOND
4936
Ionic Digital Inc
IOND
$2.91B
| $154K | ﹤0.01% |
+1,912
| New | +$140K |
2026 Q3
0 quarters
|
|
4937
Coca-Cola Consolidated
COKE
$13.8B
| $153K | ﹤0.01% |
809
-3,493
| -81% | -$658K |
2025 Q2
5 quarters
|
|
4938
ProShares UltraShort Bloomberg Natural Gas
KOLD
$56.8M
| $153K | ﹤0.01% |
+5,411
| New | +$153K |
2026 Q3
0 quarters
|
|
4939
CALL
Casella Waste Systems
CWST
$6.38B
| $153K | ﹤0.01% |
+1,900
| New | +$174K |
2026 Q3
0 quarters
|
|
4940
CALL
Xenon Pharmaceuticals
XENE
$4.03B
| $152K | ﹤0.01% |
4,100
+400
| +11% | +$23.8K |
2021 Q1
22 quarters
|
|
4941
Ashland
ASH
$3.45B
| $152K | ﹤0.01% |
+2,242
| New | +$158K |
2026 Q3
0 quarters
|
|
4942
Asana
ASAN
$2.21B
| $152K | ﹤0.01% |
+18,057
| New | +$156K |
2026 Q3
0 quarters
|
|
4943
PUT
Spire
SR
$5.21B
| $152K | ﹤0.01% |
2,000
+300
| +18% | +$24.3K |
2026 Q2
1 quarter
|
|
4944
Idacorp
IDA
$8.61B
| $152K | ﹤0.01% |
+1,164
| New | +$164K |
2026 Q3
0 quarters
|
|
4945
T-Rex 2X Long NFLX Daily Target ETF
NFLU
$22.1M
| $152K | ﹤0.01% |
10,371
+7,754
| +296% | +$137K |
2026 Q2
1 quarter
|
|
4946
Roundhill Space & Technology ETF
MARS
$46.6M
| $152K | ﹤0.01% |
6,051
-2,487
| -29% | -$64.8K |
2026 Q2
1 quarter
|
|
4947
CALL
Csquare
CSQR
$2.87B
| $152K | ﹤0.01% |
+9,600
| New | +$189K |
2026 Q3
0 quarters
|
|
4948
PUT
DELISTED
Dynamix Corp
DYNC
| $152K | ﹤0.01% |
13,900
-64,400
| -82% | -$699K |
2026 Q1
2 quarters
|
|
4949
CALL
Vuzix
VUZI
$155M
| $151K | ﹤0.01% |
54,300
-22,300
| -29% | -$57.9K |
2019 Q1
30 quarters
|
|
4950
PUT
ADMA Biologics
ADMA
$2.94B
| $151K | ﹤0.01% |
15,100
+800
| +6% | +$7.4K |
2024 Q1
10 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.