Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3176
PUT
McEwen Inc
MUX
$1.04B
| $690K | ﹤0.01% |
71,900
+46,500
| +183% | +$379K |
|
|
MRUS
3177
DELISTED
Merus
MRUS
| $689K | ﹤0.01% |
+13,100
| New | +$616K |
|
3178
CALL
Teucrium Agricultural Fund
TAGS
$19.2M
| $688K | ﹤0.01% |
143,000
-1,000
| -0.7% | -$24.9K |
|
3179
Lithia Motors
LAD
$7.88B
| $687K | ﹤0.01% |
2,034
+1,628
| +401% | +$504K |
|
3180
CALL
Amcor
AMCR
$21B
| $685K | ﹤0.01% |
14,920
-1,540
| -9% | -$71K |
|
3181
CALL
Dorchester Minerals
DMLP
$1.31B
| $685K | ﹤0.01% |
24,600
-7,300
| -23% | -$205K |
|
3182
A2Z Smart Technologies
AZ
$256M
| $684K | ﹤0.01% |
64,753
+58,816
| +991% | +$503K |
|
3183
CALL
Prairie Operating Co
PROP
$72M
| $684K | ﹤0.01% |
+228,700
| New | +$916K |
|
3184
CALL
Unusual Machines
UMAC
$976M
| $680K | ﹤0.01% |
79,400
+69,700
| +719% | +$439K |
|
3185
CALL
CarGurus
CARG
$3.16B
| $679K | ﹤0.01% |
20,300
+19,700
| +3,283% | +$594K |
|
3186
CALL
Broadstone Net Lease
BNL
$4.32B
| $678K | ﹤0.01% |
42,300
+7,200
| +21% | +$115K |
|
3187
National Vision
EYE
$1.67B
| $677K | ﹤0.01% |
29,436
+9,480
| +48% | +$162K |
|
3188
CALL
Murphy Oil
MUR
$5.38B
| $677K | ﹤0.01% |
30,100
-58,400
| -66% | -$1.3M |
|
3189
CALL
Huntington Ingalls Industries
HII
$11.3B
| $676K | ﹤0.01% |
2,800
-8,400
| -75% | -$1.88M |
|
|
CHYM
3190
PUT
Chime Financial
CHYM
$8.33B
| $676K | ﹤0.01% |
+19,600
| New | +$646K |
|
3191
PUT
Delek Logistics
DKL
$3.02B
| $674K | ﹤0.01% |
15,700
-15,000
| -49% | -$609K |
|
|
GES
3192
CALL
DELISTED
Guess Inc
GES
| $673K | ﹤0.01% |
55,700
-12,300
| -18% | -$137K |
|
3193
PUT
Transportadora de Gas del Sur
TGS
$4.58B
| $673K | ﹤0.01% |
26,000
+22,500
| +643% | +$617K |
|
3194
PUT
InterDigital
IDCC
$6.71B
| $672K | ﹤0.01% |
3,000
+300
| +11% | +$63.6K |
|
|
COOP
3195
PUT
DELISTED
Mr. Cooper
COOP
| $671K | ﹤0.01% |
4,500
| – | – |
|
3196
CALL
NextDecade
NEXT
$1.7B
| $671K | ﹤0.01% |
75,400
-42,700
| -36% | -$331K |
|
|
PPL
3197
PUT
PPL Corp
PPL
$27.1B
| $671K | ﹤0.01% |
19,800
-14,700
| -43% | -$512K |
|
3198
CALL
Revolve Group
RVLV
$1.83B
| $671K | ﹤0.01% |
33,500
+28,900
| +628% | +$585K |
|
3199
CALL
Zai Lab
ZLAB
$2.11B
| $671K | ﹤0.01% |
19,200
-300
| -2% | -$9.86K |
|
|
APLS
3200
PUT
DELISTED
Apellis Pharmaceuticals
APLS
| $669K | ﹤0.01% |
38,700
-9,800
| -20% | -$181K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.