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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 | |
|---|---|---|---|---|---|---|---|
4676
CALL
BillionToOne Inc
BLLN
$5.02B
| $192K | ﹤0.01% |
1,800
-1,000
| -36% | -$112K |
2026 Q1
2 quarters
|
|
4677
PUT
Energizer
ENR
$1.65B
| $190K | ﹤0.01% |
8,900
-33,500
| -79% | -$715K |
2016 Q2
41 quarters
|
|
4678
CALL
Tecogen Inc
TGEN
$57.7M
| $190K | ﹤0.01% |
67,000
+23,700
| +55% | +$82.1K |
2025 Q3
4 quarters
|
|
4679
CALL
Flowserve
FLS
$10.5B
| $190K | ﹤0.01% |
2,600
+1,100
| +73% | +$82.6K |
2016 Q2
41 quarters
|
|
4680
PUT
JBT Marel
JBTM
$6.41B
| $190K | ﹤0.01% |
1,800
-2,200
| -55% | -$273K |
2024 Q1
10 quarters
|
|
4681
CALL
Everspin Technologies
MRAM
$299M
| $190K | ﹤0.01% |
10,300
-31,200
| -75% | -$520K |
2025 Q2
5 quarters
|
|
4682
CALL
Editas Medicine
EDIT
$335M
| $190K | ﹤0.01% |
73,900
+8,000
| +12% | +$23.4K |
2021 Q2
21 quarters
|
|
4683
PUT
Hello Group
MOMO
$635M
| $190K | ﹤0.01% |
39,200
-7,400
| -16% | -$41.5K |
2015 Q2
45 quarters
|
|
4684
PUT
National Grid
NGG
$84.7B
| $190K | ﹤0.01% |
2,500
+1,800
| +257% | +$144K |
2016 Q1
42 quarters
|
|
4685
CALL
Haemonetics
HAE
$5.6B
| $190K | ﹤0.01% |
1,800
+1,500
| +500% | +$140K |
2020 Q1
26 quarters
|
|
4686
State Street SPDR S&P Pharmaceuticals ETF
XPH
$498M
| $190K | ﹤0.01% |
+2,916
| New | +$201K |
2026 Q3
0 quarters
|
|
4687
Rezolve AI
RZLV
$500M
| $189K | ﹤0.01% |
+87,292
| New | +$216K |
2026 Q3
0 quarters
|
|
4688
CALL
Aemetis
AMTX
$86.6M
| $189K | ﹤0.01% |
106,300
+47,500
| +81% | +$83.8K |
2020 Q4
23 quarters
|
|
4689
PUT
OptimizeRx
OPRX
$138M
| $189K | ﹤0.01% |
22,600
+16,200
| +253% | +$117K |
2025 Q3
4 quarters
|
|
4690
Insulet
PODD
$10.6B
| $189K | ﹤0.01% |
+1,446
| New | +$216K |
2026 Q3
0 quarters
|
|
4691
CALL
Q2 Holdings
QTWO
$4.57B
| $188K | ﹤0.01% |
3,400
-2,200
| -39% | -$130K |
2022 Q3
16 quarters
|
|
4692
CALL
Upbound Group
UPBD
$1.46B
| $188K | ﹤0.01% |
12,000
-7,700
| -39% | -$148K |
2016 Q2
41 quarters
|
|
4693
CALL
Rayonier Advanced Materials
RYAM
$382M
| $188K | ﹤0.01% |
23,600
-26,900
| -53% | -$225K |
2015 Q3
44 quarters
|
|
4694
Robert Half
RHI
$4.3B
| $187K | ﹤0.01% |
+5,096
| New | +$201K |
2026 Q3
0 quarters
|
|
4695
PUT
Pliant Therapeutics
PLRX
$43.2M
| $187K | ﹤0.01% |
173,100
+116,100
| +204% | +$129K |
2025 Q2
5 quarters
|
|
4696
PUT
Wave Life Sciences
WVE
$617M
| $187K | ﹤0.01% |
50,500
+41,900
| +487% | +$220K |
2022 Q2
17 quarters
|
|
4697
CALL
PACCAR
PCAR
$56.2B
| $187K | ﹤0.01% |
1,700
-4,300
| -72% | -$538K |
2015 Q2
45 quarters
|
|
4698
PUT
AerCap
AER
$26.7B
| $187K | ﹤0.01% |
1,300
-57,500
| -98% | -$8.49M |
2021 Q2
21 quarters
|
|
4699
CALL
Boyd Gaming
BYD
$5.46B
| $186K | ﹤0.01% |
2,800
-6,400
| -70% | -$521K |
2021 Q2
21 quarters
|
|
4700
PUT
PepGen
PEPG
$302M
| $186K | ﹤0.01% |
+77,000
| New | +$200K |
2026 Q3
0 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.