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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 | |
|---|---|---|---|---|---|---|---|
2526
Modine Manufacturing
MOD
$5.67B
| $1.2M | ﹤0.01% |
6,419
+1,851
| +41% | +$378K |
2025 Q4
3 quarters
|
|
|
AIRL
2527
PUT
DELISTED
Themes Airlines ETF
AIRL
| $1.2M | ﹤0.01% |
166,500
+144,200
| +647% | +$1.04M |
2025 Q2
5 quarters
|
|
2528
CALL
Protagonist Therapeutics
PTGX
$8.8B
| $1.2M | ﹤0.01% |
8,500
+4,400
| +107% | +$627K |
2026 Q1
2 quarters
|
|
2529
Fermi Inc
FRMI
$1.16B
| $1.2M | ﹤0.01% |
284,433
+31,822
| +13% | +$189K |
2026 Q2
1 quarter
|
|
2530
PUT
PennyMac Financial
PFSI
$3.24B
| $1.2M | ﹤0.01% |
19,400
+7,100
| +58% | +$538K |
2019 Q4
27 quarters
|
|
2531
CALL
Krystal Biotech
KRYS
$9.15B
| $1.2M | ﹤0.01% |
3,600
+1,400
| +64% | +$485K |
2025 Q2
5 quarters
|
|
2532
PUT
Founder-Led ETF
FDRS
$82.3M
| $1.2M | ﹤0.01% |
47,100
+37,200
| +376% | +$903K |
2026 Q2
1 quarter
|
|
2533
Dorian LPG
LPG
$2.04B
| $1.2M | ﹤0.01% |
21,708
+16,869
| +349% | +$809K |
2026 Q1
2 quarters
|
|
2534
CALL
Crown Castle
CCI
$37.9B
| $1.19M | ﹤0.01% |
17,900
+13,300
| +289% | +$998K |
2015 Q1
46 quarters
|
|
2535
CALL
Tencent Music
TME
$15B
| $1.19M | ﹤0.01% |
150,400
+88,800
| +144% | +$772K |
2018 Q4
31 quarters
|
|
2536
CALL
TAL Education Group
TAL
$5.59B
| $1.19M | ﹤0.01% |
98,800
-23,000
| -19% | -$262K |
2016 Q2
41 quarters
|
|
2537
Centrus Energy
LEU
$2.31B
| $1.19M | ﹤0.01% |
8,547
-2,186
| -20% | -$369K |
2026 Q2
1 quarter
|
|
2538
CALL
Merlin Inc
MRLN
$102M
| $1.19M | ﹤0.01% |
633,800
+231,300
| +57% | +$793K |
2026 Q2
1 quarter
|
|
2539
PUT
The RealReal
REAL
$1.81B
| $1.19M | ﹤0.01% |
134,600
-25,700
| -16% | -$278K |
2023 Q2
13 quarters
|
|
2540
Sezzle
SEZL
$5.16B
| $1.19M | ﹤0.01% |
11,012
-1,623
| -13% | -$226K |
2026 Q1
2 quarters
|
|
2541
PUT
Fidelity Ethereum Fund
FETH
$1.12B
| $1.19M | ﹤0.01% |
44,700
-6,400
| -13% | -$138K |
2025 Q2
5 quarters
|
|
2542
PUT
International Paper
IP
$18.4B
| $1.19M | ﹤0.01% |
35,800
+5,300
| +17% | +$203K |
2014 Q4
47 quarters
|
|
2543
Rockwell Automation
ROK
$45.1B
| $1.19M | ﹤0.01% |
+2,726
| New | +$1.21M |
2026 Q3
0 quarters
|
|
2544
PUT
PennyMac Mortgage Investment
PMT
$651M
| $1.19M | ﹤0.01% |
150,500
-141,000
| -48% | -$1.34M |
2018 Q2
33 quarters
|
|
2545
Penske Automotive Group
PAG
$14.1B
| $1.19M | ﹤0.01% |
5,919
+5,673
| +2,306% | +$1.19M |
2026 Q2
1 quarter
|
|
2546
Eaton
ETN
$140B
| $1.19M | ﹤0.01% |
2,759
+1,820
| +194% | +$760K |
2025 Q3
4 quarters
|
|
2547
PUT
Northern Trust
NTRS
$32.4B
| $1.19M | ﹤0.01% |
7,000
+1,900
| +37% | +$347K |
2018 Q2
33 quarters
|
|
2548
PUT
Bentley Systems
BSY
$13.4B
| $1.19M | ﹤0.01% |
37,100
+35,400
| +2,082% | +$1.19M |
2025 Q2
5 quarters
|
|
2549
Sonos
SONO
$2.25B
| $1.18M | ﹤0.01% |
66,172
+41,071
| +164% | +$637K |
2026 Q2
1 quarter
|
|
2550
SLM Corp
SLM
$3.18B
| $1.18M | ﹤0.01% |
52,264
+15,113
| +41% | +$389K |
2026 Q2
1 quarter
|
|
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.